JP6521911B2 - Fluidizer composition for soil cement, cement suspension and soil cement - Google Patents

Description

  The present invention relates to soil cement applied to ground improvement method, underground continuous wall method, foundation pile method, backfill method, etc., and cement-based suspension ("cement milk" or "cement slurry") used for its preparation And a fluidizer composition for soil cement (hereinafter also referred to as "a fluidizer for soil cement").

  Soil cement is generally produced by mixing cement (including a cement-based solidifying agent) and water to prepare a cement-based suspension, and then mixing the cement-based suspension with soil. It is a mixture, and if necessary, contains bentonite or a water-soluble polymer, for example, to suppress bleeding and the like. Soil cement is used in the ground improvement method, underground continuous wall method, foundation pile method, backfilling method, etc. In these methods, after the soil cement is prepared, the solidified material is formed after a certain time Let And, in the soil cement used in these construction methods, the injection amount of cement-based suspension or the generation amount of waste soil cement (hereinafter referred to as "mud") is reduced, and the flowability of the soil cement is improved and construction is carried out. In order to improve the efficiency, soil cement fluidizers have recently been incorporated.

The following techniques are known as fluidizers for soil cement.
Patent Document 1 discloses a fluidizer for soil cement comprising a low molecular weight polymer containing a carboxylic acid or a monovalent salt thereof as a main constituent monomer unit and an alkali metal carbonate.
Patent Document 2 discloses that (i) at least one polymer and copolymer selected from an ethylenically unsaturated monocarboxylic acid and an ethylenically unsaturated dicarboxylic acid, and a weight comprising at least one of water-soluble salts thereof. An additive for a ground improvement cement composition is disclosed which comprises a coalescing component and (ii) a bicarbonate component comprising at least one of a water soluble bicarbonate salt. And
In Patent Document 3, as a method of fluidizing cement slurry, (A) a water-soluble vinyl having a weight average molecular weight of 2,000 to 50,000 obtained by alkali hydrolysis of a copolymer of an α-olefin having 3 to 5 carbon atoms and maleic anhydride A copolymer, and one or more selected from polyacrylates having a weight average molecular weight of 1,500 to 50,000, and (B) one selected from (2) alkali metal salts of secondary phosphates and alkali metal salts of tertiary phosphates Or the method of using the fluidizer which consists of two or more is disclosed.

Patent Document 4 discloses a soil cement additive containing a specific phosphoric acid ester-based polymer. And, it is described that it may further contain at least one curing retarder selected from the group consisting of organic acids and salts thereof, polyphosphoric acids and salts thereof, saccharides, and sugar alcohols.
Patent Document 5 discloses a ground stabilization admixture comprising a phosphate, an alkali metal chloride, and a polyacrylic acid.
Further, Patent Document 6 shows a composition containing a copolymer (X) composed of (meth) acrylic acid alkaline earth metal salt (A) unit and a copolymerizable monomer (B) unit, There is disclosed a soil cement dispersant characterized in that it comprises 20 to 85 mol% of a meta) alkaline earth metal salt (A) unit and 15 to 80 mol% of a copolymerizing monomer (B) unit. And, it is described that sodium carbonate may be further contained.

JP 2000-169209 A Unexamined-Japanese-Patent No. 2004-175989 Unexamined-Japanese-Patent No. 2006-131671 Unexamined-Japanese-Patent No. 2007-169547 JP 2007-314725 A JP, 2013-139369, A

Among the above-mentioned methods, in foundation continuous wall method such as underground continuous wall method and steel pipe pile method, etc., after construction of soil cement on original ground (under ground), stress materials such as H-shaped steel and steel pipe are built . In this case, from the start of drilling to the completion of construction of the stress material, the soil cement needs to have appropriate fluidity so that the stress material can be placed at a predetermined position by the weight of the stress material. With regard to the fluidity of such soil cement, most of the work until the last 10 years, if the time for which the table flow value of soil cement is 150 mm or more (fluidity retention time) is about 2 to 4 hours It was possible to proceed without problems.
Recently, however, work has been increasing in urban areas for the extension of the liquidity holding time due to the following reasons a) to d).
A) As environmental measures (consideration to noise and vibration) of neighboring residents, construction interruption of lunch time zone and construction suspension after 5 or 6 o'clock in the evening b) Transfer of construction related vehicles due to traffic congestion and traffic regulation around the site Delay in unloading (construction interruption due to delay)
C) Delay in the construction time per one step (from the start of drilling to completion of construction of stress material) due to the construction interruptions in a) and b) d) By effective utilization of narrow land in urban areas, public infrastructure development, etc. Deepening

In construction with a construction time restriction in the evening and large-depth construction, etc., the construction of one process (from the start of drilling to the completion of construction of stress material) is completed, and the next time the construction of the same process is performed, the construction is that day If it was judged that it would not be in time for the work end regulation time, construction work was abandoned even if it was 2 pm. The reason is that if the construction is carried over the next day, the fluidity of the soil cement prepared on the previous day will be lost and it will solidify and re-drilling must be done (retroduction period, excess of used materials and generated mud). In addition, it is a case where it is judged that the construction of one process (from the start of drilling to the completion of construction of the stress material) is in time before the operation end regulation time, and drilling is started. Even if one process can not be carried out on the same day, re-drilling will be necessary the next day (due to construction period, excess of materials used and generated mud).
Furthermore, in the case where the construction time delay of one process occurs frequently, considering the fluidity retention time of soil cement, it is not possible to build up the stress material collectively after the construction of a plurality of processes. In this case, due to the influence of the stirring blade and stirring high-pressure air at the time of drilling, the stress material built in the previous construction shakes, resulting in building accuracy Decreases.

  The object of the present invention is that the time (the flowability holding time) until the table flow value becomes less than 200 mm from the time when the soil cement is prepared can be 7 hours or more, and the table flow value is less than 150 mm. It is to provide a cement-based suspension (cement milk) which can take 9 hours or more to be, and a fluidizer composition for soil cement which gives it.

The present inventors are an alkali metal carbonate for a water-soluble polymer in a composition in which a main component water-soluble polymer, an alkali metal carbonate, an alkali metal bicarbonate and an alkali metal phosphate are used in combination. The present inventors have made extensive studies on the effect of the content ratio of alkali metal bicarbonate and phosphate on the fluidity of soil cement, that is, the dispersion and retention of cement and soil in soil cement, and completed the present invention.
The present invention is shown below.
[1] A fluidizer composition for soil cement comprising (A) a water-soluble polymer, (B) an alkali metal carbonate, (C) an alkali metal bicarbonate, and (D) an alkali metal phosphate. The content of the alkali metal carbonate (B), the alkali metal bicarbonate (C), and the alkali metal phosphate (D) is 100 parts by mass of the water-soluble polymer (A). To 50 to 1350 parts by mass, 50 to 1350 parts by mass, and 1 to 600 parts by mass, respectively, and the total content of the alkali metal carbonate (B) and the alkali metal bicarbonate (C) The fluidizer composition for soil cement, comprising 100 to 2500 parts by mass with respect to 100 parts by mass of the water-soluble polymer (A).
[2] The above water-soluble polymer (A) is a structural unit derived from a monomer having an ethylenically unsaturated bond, and contains a structural unit having a COO bond, and the weight average molecular weight is 50000 or less The fluidizer composition for soil cement as described in [1].
[3] The fluidizer composition for soil cement according to the above [1] or [2], wherein the water-soluble polymer (A) is a polymer containing a structural unit derived from acrylic acid or a salt thereof.
[4] The soil cement according to any one of the above [1] to [3], wherein the alkali metal carbonate (B) is sodium carbonate and the alkali metal bicarbonate (C) is sodium bicarbonate Fluidizer composition.
[5] The above-mentioned phosphate alkali metal salt (D) is an alkali metal salt of tripolyphosphate, an alkali metal salt of tetrapolyphosphate, an alkali metal salt of hexametaphosphate, an alkali metal salt of pyrophosphate, an alkali metal of primary phosphate And at least one selected from salts, alkali metal salts of secondary phosphoric acid, alkali metal salts of tertiary phosphoric acid, alkali metal salts of acidic metaphosphoric acid, and alkali metal salts of acidic pyrophosphoric acid [1] A fluidizer composition for soil cement according to any one of [4].
[6] The fluidizer composition for soil cement according to any one of the above [1] to [5], which is used in the ground improvement method, underground continuous wall method, foundation pile method or backfill method.
[7] A cementitious suspension comprising the fluidizer composition for soil cement according to any one of the above [1] to [6], cement, and water.
[8] A soil cement comprising the cement-based suspension according to the above [7] and soil.
In the present specification, the weight average molecular weight of the polymer (hereinafter also referred to as "Mw") is a standard sodium polyacrylate equivalent value measured by gel permeation chromatography (hereinafter also referred to as "GPC"). It is. The description of "(meth) acrylic" means acrylic and methacrylic. Moreover, the description of "(co) polymer" means a homopolymer and a copolymer.

The fluidizer composition for soil cement, the cement-based suspension and the soil cement according to the present invention are suitable for the ground improvement method, the underground continuous wall method, the foundation pile method, the backfill method and the like.
According to the fluidizer composition for soil cement and the cement-based suspension of the present invention, the time until the table flow value becomes less than 150 mm (flowability retention time) is 2 to 4 after the soil cement is prepared Soil cement that has a fluidity retention time of 9 hours or more longer than conventional soil cement, which is about time, and can make the time for the table flow value to be less than 200 mm to be 7 hours or more, That is, it is possible to provide a soil cement which is excellent in dispersion and retention of cement and soil. Therefore, even if the construction takes a long time, problems can be suppressed.

  The present invention forms soil cement by mixing the soil excavated from the original ground (in the ground) or the soil in the original ground (under ground) with the cement-based suspension, thereby forming a soil cement. A ground improvement method for forming a ground with improved strength etc., a soil excavated from the original ground (underground) or a soil remaining in the original ground (underground) and a cement-based suspension Underground wall construction method to build a stress material (H-type steel, I-type steel, etc.) to be a reinforcing material of underground continuous wall while the soil cement is fluid after forming soil cement, base ground (underground) The foundation pile method which mixes soil with the inside of c) and cement-based suspension to form soil cement and integrates it with steel pipe to construct a composite pile, soil excavated from the original ground (under ground) And cement-based suspension to form soil cement and backfill it to the ground It is intended to be preferably applied in order back method or the like.

  The fluidizer composition for soil cement of the present invention comprises (A) a water-soluble polymer, (B) an alkali metal carbonate, (C) an alkali metal bicarbonate, and (D) an alkali metal phosphate. It is a composition that contains a specific ratio, and may be a composition that may contain other components (described later), if necessary.

  The water-soluble polymer (A) is not particularly limited as long as it is soluble in water, and includes, for example, a structural unit derived from a monomer having an ethylenically unsaturated bond (vinyl-based monomer) A vinyl (co) polymer or a salt thereof (hereinafter, simply referred to as "vinyl (co) polymer"), a polyalkylene glycol, a polysaccharide and the like can be used. The fluidizer composition for soil cement of the present invention may contain only one type of water-soluble polymer (A) or may contain two or more types.

（式中、Ｍは、水素原子、アルカリ金属原子、アルカリ土類金属原子又はＮＨ_４であり、Ｒは、炭化水素基である。）
上記ビニル系（共）重合体に含まれる親水性基は、分子末端に位置していてよいし、側鎖に含まれていてもよい。
上記ビニル系（共）重合体は、上記親水性基の少なくとも１つを有するビニル系単量体に由来する構造単位（親水性基含有構造単位）を含むことが好ましい。この場合、親水性基含有構造単位の含有割合は、ビニル系（共）重合体を構成するすべての構造単位の合計を１００質量％とした場合に、好ましくは４０質量％以上、より好ましくは５０質量％以上であり、更に好ましくは７０質量％以上である。尚、上限値は１００質量％である。 The vinyl (co) polymer preferably contains at least one of the following hydrophilic groups.

(Wherein, M is a hydrogen atom, an alkali metal atom, an alkaline earth metal atom or NH ₄ , and R is a hydrocarbon group)
The hydrophilic group contained in the above-mentioned vinyl (co) polymer may be located at the molecular terminal or may be contained in the side chain.
The vinyl-based (co) polymer preferably includes a structural unit (hydrophilic group-containing structural unit) derived from a vinyl-based monomer having at least one of the above-mentioned hydrophilic groups. In this case, the content ratio of the hydrophilic group-containing structural unit is preferably 40% by mass or more, more preferably 50% when the total of all structural units constituting the vinyl-based (co) polymer is 100% by mass. It is not less than mass%, more preferably not less than 70 mass%. The upper limit is 100% by mass.

Moreover, it is preferable that the said vinyl-type (co) polymer contains a COO coupling | bonding. In this case, not only the polymer containing -COOM exemplified as the hydrophilic group, but also a polymer containing a hydrophilic group other than -COOM and a COO bond are preferable. Incidentally, the COO bond means one exemplified below.

  The COO bond may be one directly bonded to a carbon atom constituting a main chain derived from an ethylenically unsaturated bond, or may be included in a side chain.

（式中、Ｒ^１は、炭素原子数１〜３の炭化水素基であり、Ｒ^２は、炭素原子数１〜２０の、置換又は非置換の２価の炭化水素基であり、Ｒ^３は、炭素原子数１〜４０の炭化水素基であり、Ｍ^１、Ｍ^２及びＭ^３は、互いに独立して、水素原子、アルカリ金属原子、アルカリ土類金属原子又はＮＨ_４である。）

（式中、Ｒ^１は、炭素原子数１〜３の炭化水素基であり、Ｒ^３は、炭素原子数１〜４０の炭化水素基であり、Ｒ^４は、炭素原子数２〜４の、置換又は非置換の２価の炭化水素基であり、Ｍ^１、Ｍ^２及びＭ^３は、互いに独立して、水素原子、アルカリ金属原子、アルカリ土類金属原子又はＮＨ_４であり、ｎは、１〜２０の整数である。）

（式中、Ｒ^１は、炭素原子数１〜３の炭化水素基であり、Ｒ^２は、炭素原子数１〜２０の、置換又は非置換の２価の炭化水素基であり、Ｒ^４は、炭素原子数２〜４の、置換又は非置換の２価の炭化水素基であり、Ｍ^４は、水素原子、アルカリ金属原子、アルカリ土類金属原子又はＮＨ_４であり、ｎは、１〜２０の整数である。）

（式中、Ｒ^１は、炭素原子数１〜３の炭化水素基であり、Ｒ^５は、炭素原子数２〜４の、置換又は非置換の２価の炭化水素基であり、Ｒ^６は、炭素原子数１〜４０の炭化水素基であり、Ｒ^７は、炭素原子数１〜２０の、置換又は非置換の２価の炭化水素基であり、Ｒ^８は、炭素原子数２〜４の、置換又は非置換の２価の炭化水素基であり、Ｒ^９は、炭素原子数１〜４０の炭化水素基であり、Ｍ^４は、水素原子、アルカリ金属原子、アルカリ土類金属原子又はＮＨ_４であり、ｎは、１〜２０の整数である。） Acrylic acid and salts thereof (sodium acrylate, potassium acrylate, magnesium acrylate, calcium acrylate, etc.), methacrylic acid and salts thereof as vinyl monomers giving hydrophilic group-containing structural units containing the above COO bond (Sodium methacrylate, potassium methacrylate etc.), ethacrylic acid and its salts, crotonic acid and its salts, cinnamic acid and its salts, maleic acid and its salts (sodium maleate etc.), methylmaleic acid and its salts, dimethylmaleic acid Acid and its salt, phenylmaleic acid and its salt, maleic acid half ester and its salt, fumaric acid and its salt (sodium fumarate etc.), fumaric acid half ester and its salt, itaconic acid and its salt (sodium itaconate etc. ), Itaconic acid half ester and its salts, citraco Monomers having an —COOM group such as acids and salts thereof, citraconic acid half esters and salts thereof; monomers having acid anhydride groups such as maleic anhydride, itaconic anhydride, citraconic anhydride; ) 2-Hydroxyethyl acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, (meth ) 4-hydroxybutyl acrylate, polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, di-2-hydroxyethyl maleate, di-4-hydroxybutyl maleate, di-2-hydroxypropyl itaconate Etc., monomers having a hydroxyl group; 2- (meth) a Lyloyloxyethyl phosphate, 2- (meth) acryloyloxypropyl phosphate, 2- (meth) acryloyloxy 3-chloropropyl phosphate, phenyl-2- (meth) acryloyloxyethyl phosphate, phosphorus of polyethylene glycol mono (meth) acrylate A phosphorus atom-containing monomer represented by the following general formula (1), (2), (3) or (4), such as acid ester or phosphoric acid ester of polypropylene glycol mono (meth) acrylate; 1- (meth) ) Acryloyl oxyethane sulfonic acid and its salt, 2- (meth) acryloyl oxyethane sulfonic acid and its salt, 2- (meth) acryloyl oxypropane sulfonic acid and its salt, 3- (meth) acryloyl oxypropane sulfonic acid and its salt Salt, 2- (meta) ac Lyloyloxybutanesulfonic acid and its salt, 3- (meth) acryloyloxybutanesulfonic acid and its salt, 4- (meth) acryloyloxybutanesulfonic acid and its salt, 2-hydroxysulfopropyl (meth) acrylate and its salt , 3- (Meth) acryloxy-2- (poly) oxyethylene ether propane sulfonic acid and its salt, 3- (meth) acryloxy-2- (poly) oxypropylene ether propane sulfonic acid and its salt, etc. Sulfur atom-containing monomer represented by (5) or (6); sulfur atom-containing monomer represented by the following general formula (7), (8), (9) or (10) .

(Wherein, R ¹ is a hydrocarbon group of 1 to 3 carbon atoms, R ² is a substituted or unsubstituted divalent hydrocarbon group of 1 to 20 carbon atoms, and R ³ is M ¹ , M ² and M ³ are, independently of one another, a hydrogen atom, an alkali metal atom, an alkaline earth metal atom or NH ₄ ).

(Wherein, R ¹ is a hydrocarbon group having 1 to 3 carbon atoms, R ³ is a hydrocarbon group having 1 to 40 carbon atoms, and R ⁴ is 2 to 4 carbon atoms, M ¹ , M ² and M ³ are, independently of one another, a hydrogen atom, an alkali metal atom, an alkaline earth metal atom or NH ₄ , each being a substituted or unsubstituted divalent hydrocarbon group, and n is It is an integer of 1 to 20.)

(Wherein, R ¹ is a hydrocarbon group having 1 to 3 carbon atoms, R ² is a substituted or unsubstituted divalent hydrocarbon group having 1 to 20 carbon atoms, and R ⁴ is And a substituted or unsubstituted divalent hydrocarbon group having 2 to 4 carbon atoms, M ⁴ is a hydrogen atom, an alkali metal atom, an alkaline earth metal atom or NH ₄ , and n is 1 to 4 It is an integer of 20.)

(Wherein, R ¹ is a hydrocarbon group having 1 to 3 carbon atoms, R ⁵ is a substituted or unsubstituted divalent hydrocarbon group having 2 to 4 carbon atoms, and R ⁶ is And R ⁷ represents a substituted or unsubstituted divalent hydrocarbon group having 1 to 20 carbon atoms, and R ⁸ represents 2 to 4 carbon atoms. R ⁹ is a hydrocarbon group having 1 to 40 carbon atoms, and M ⁴ is a hydrogen atom, an alkali metal atom, an alkaline earth metal atom, or a substituted or unsubstituted divalent hydrocarbon group of it is NH _4, n is an integer from 1 to 20.)

  As a vinyl-type monomer which provides the hydrophilic group containing structural unit which contains a COO bond which comprises the said vinyl-type (co) polymer, the monomer which has -COOM group is preferable, and acrylic acid or its salt is especially preferable. preferable.

  Moreover, as a vinyl monomer which does not contain a COO bond but gives a hydrophilic group-containing structural unit, vinyl alcohol, acrylamide, methacrylamide, dimethyl acrylamide, diethyl acrylamide, N-n-propyl acrylamide, N-isopropyl acrylamide, N-methylol acrylamide, N-methylol methacrylamide, N- (2-hydroxyethyl) acrylamide, N- (2-hydroxyethyl) methacrylamide, N, N-dimethylaminoethyl acrylamide, N, N-dimethylaminoethyl methacrylamide N-vinyl-2-pyrrolidone, N-vinyl-4-pyrrolidone, N-vinyl-3-methylpyrrolidone, N-vinyl-5-methylpyrrolidone, N-vinyl-3-benzylpyrrolidone, N-vinyl-3, 3, - tri-methyl pyrrolidone, N- acryloyl Lupi Peji phosphorus, N- acryloyl pyrrolidine, vinylformamide, and vinyl acetamide and the like.

  The vinyl (co) polymer may further contain a structural unit having no hydrophilic group. Examples of vinyl monomers giving such structural units include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate and isopropyl (Meth) acrylate, tert-butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, n-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, decyl (meth) ) Acrylate, isodecyl (meth) acrylate, lauryl (meth) acrylate, tetradecyl (meth) acrylate, octadecyl (meth) acrylate, isostearyl (meth) acrylate, cyclopentyl (meth) acrelay , Cyclohexyl (meth) acrylate, tert-butyl cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, 2,2,4-trimethylcyclohexyl (meth) acrylate, phenyl (meth) acrylate, benzyl (meth) acrylate, naphthyl (meth ) Acrylate, methoxyethyl (meth) acrylate, methoxypropyl (meth) acrylate, ethoxyethyl (meth) acrylate, ethoxypropyl (meth) acrylate, vinylamine, allylamine, aminostyrene, 2-aminoethyl (meth) acrylate, vinylmethylamine Allylmethylamine, methylaminostyrene, tert-butylaminoethyl (meth) acrylate, tetramethyl piperidyl (meth) acrylate, dimethy Aminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, pentamethyl piperidyl (meth) acrylate, N-ethylmorpholino (meth) acrylate, dimethylaminostyrene, styrene, α-methylstyrene, o-methylstyrene, p-methyl Styrene, β-methylstyrene, ethylstyrene, p-tert-butylstyrene, vinyltoluene, vinylxylene, vinylnaphthalene, ethylene, propylene, butene, pentene, hexene, octene and the like can be mentioned.

  Examples of the polyalkylene glycol include polyethylene glycol, polypropylene glycol, polyethylene polypropylene glycol, polyethylene polybutylene glycol and the like.

  As said polysaccharide, nonionic cellulose, anionic cellulose, cationic cellulose etc. are mentioned.

  The weight average molecular weight (Mw) of the water-soluble polymer (A) is preferably 50000 or less, more preferably 30000 or less, still more preferably from the viewpoint of flowability of the soil cement, strength when the soil cement is solidified, etc. It is 20000 or less. The lower limit value of the weight average molecular weight (Mw) is usually 2,000.

  The water-soluble polymer (A) according to the present invention contains a structural unit derived from a monomer having a -COOM group because the fluidity of soil cement, the strength when soil cement is solidified, and the like are more excellent. Vinyl (co) polymers are preferred, and vinyl (co) polymers comprising structural units derived from acrylic acid or its salts are particularly preferred. When the water-soluble polymer (A) is a vinyl (co) polymer containing a structural unit derived from acrylic acid or a salt thereof, acrylic acid or a salt thereof contained in the vinyl (co) polymer The proportion of the structural unit derived is preferably 50% by mass or more, more preferably 70% by mass or more, and still more preferably 80% by mass or more.

  The alkali metal carbonate (B) is preferably a water-soluble compound. Examples of the water-soluble alkali metal carbonate include sodium carbonate, potassium carbonate and lithium carbonate. Among these, sodium carbonate is particularly preferable from the viewpoint of flowability of the soil cement, strength when the soil cement is solidified, cost effectiveness, and the like. The fluidizer composition for soil cement of the present invention may contain only one type or two or more types of alkali metal carbonate (B).

  The content of the alkali metal carbonate (B) contained in the fluidizer composition for soil cement of the present invention is the above water-soluble polymer from the viewpoint of flowability of soil cement, strength when soil cement is solidified, etc. (A) 50 to 1350 parts by mass, preferably 50 to 1000 parts by mass, and more preferably 50 to 500 parts by mass with respect to 100 parts by mass of (A).

  The alkali metal bicarbonate (C) is preferably a water-soluble compound. Examples of the water-soluble alkali metal bicarbonate include sodium hydrogen carbonate and potassium hydrogen carbonate. Among these, sodium hydrogen carbonate is particularly preferable in view of flowability of the soil cement, strength when the soil cement is solidified, cost effectiveness, and the like. The fluidizer composition for soil cement of the present invention may contain only one type of alkali metal bicarbonate (C), or may contain two or more types.

  The content of the alkali metal bicarbonate (C) contained in the fluidizer composition for soil cement of the present invention is the above water-soluble heavy weight from the viewpoint of fluidity of soil cement, strength when soil cement is solidified, etc. The amount is 50 to 1350 parts by mass, preferably 50 to 1000 parts by mass, and more preferably 50 to 500 parts by mass with respect to 100 parts by mass of the united body (A).

  Moreover, in the fluidizer composition for soil cement of the present invention, the total content of the alkali metal carbonate (B) and the alkali metal bicarbonate (C) is the fluidity of the soil cement, and the soil cement is solidified. Since it is more excellent in strength and the like, it is 100 to 2500 parts by mass, preferably 100 to 1500 parts by mass, and more preferably 100 to 800 parts by mass with respect to 100 parts by mass of the water-soluble polymer (A).

  The mass ratio of the alkali metal carbonate (B) and the alkali metal bicarbonate (C) contained in the fluidizer composition for soil cement of the present invention is the fluidity of the soil cement, the strength when the soil cement is solidified, etc. Preferably, it is 85:15 to 15:85, more preferably 80:20 to 20:80.

  The phosphoric acid alkali metal salt (D) is not particularly limited as long as it is an inorganic compound, and is preferably a water-soluble compound. Examples of the alkali metal phosphate (D) include alkalis such as tripolyphosphoric acid, tetrapolyphosphoric acid, hexametaphosphoric acid, pyrophosphoric acid, primary phosphoric acid, secondary phosphoric acid, tertiary phosphoric acid, acidic metaphosphoric acid, acidic pyrophosphoric acid and the like Metal salts can be used. Examples of metal salts include sodium salts, potassium salts, lithium salts and the like. In the present invention, sodium salt or potassium salt of tripolyphosphoric acid, tetrapolyphosphoric acid, hexametaphosphoric acid, pyrophosphoric acid, primary phosphoric acid, secondary phosphoric acid or tertiary phosphoric acid is more preferable, and tripolyphosphoric acid, tetrapolyphosphoric acid, hexametaline Particularly preferred are the sodium salts of acids, pyrophosphates, secondary phosphates or tertiary phosphates. The fluidizer composition for soil cement of the present invention may contain only one type or two or more types of alkali metal phosphate (D).

  The content of the alkali metal phosphate (D) contained in the fluidizer composition for soil cement of the present invention is more excellent in the fluidity of the soil cement, the strength when the soil cement is solidified, etc. It is 1 to 600 parts by mass, preferably 1 to 500 parts by mass, and more preferably 1 to 250 parts by mass with respect to 100 parts by mass of the hydrophobic polymer (A).

  The fluidizer composition for soil cement of the present invention comprises the quality (clay, silt, sand, gravel) of the soil of the original ground (target soil) and its physical properties (wet density, water content ratio, liquid limit, etc.) Depending on the construction conditions (standard composition: cement amount, water / cement ratio, injection amount, required quality etc.) in each construction method, cement retarder such as gluconate, triethanolamine, sucrose etc. and hardening acceleration Agents, lignin sulfonic acid compounds, water reducing agents such as naphthalene compounds, or AE water reducing agents or fluidizing agents, AE agents, foaming agents, foaming agents, antifoaming agents, thickeners, separation reducing agents, rust inhibitors, Conventionally known additives such as shrinkage reducing agents, expanding agents, antifreeze agents, pozzolanic additives, etc. can be contained.

  The properties of the fluidizer composition for soil cement of the present invention are not particularly limited, and any of a solid mixture and a liquid dispersion may be used.

  The fluidizer composition for soil cement of the present invention can be produced by mixing the raw material components. As the alkali metal carbonate and the alkali metal bicarbonate, these may be used as they are, or a double salt alkali sesqui carbonate may be used. Moreover, when setting it as a liquid dispersion, it can manufacture, for example using the aqueous solution which dissolves one part or all the raw material components previously in water.

  The cement-based suspension of the present invention contains the above-described fluidizer composition for soil cement of the present invention, cement, and water. That is, the cement suspension of the present invention comprises a water-soluble polymer (A), an alkali metal carbonate (B), an alkali metal bicarbonate (C) and an alkali metal phosphate (D). It contains cement and water.

The cement is not particularly limited as long as it hardens by hydration reaction, and conventionally known Portland cement (normal, early strength, very early strength, moderate heat, low heat, sulfuric acid resistance as shown in JIS R 5210) Salts, blast furnace cement (A, B, C shown in JIS R5211), silica cement (A, B, C, JS shown in R 5212), fly ash cement (JIS R 5213) Use mixed cement such as A, B and C), and environment-friendly cement (Ecocement) manufactured from municipal waste incineration ash or sewage sludge incineration ash as raw materials. it can.
In the present invention, blast furnace cement is preferable and blast furnace cement type B is preferable because the fluidity of soil cement, the strength when soil cement is solidified, and the like are excellent.
For loam soils, humus soils, and the like that are considered to be difficult to obtain strength after solidification, cement-based solidifying agents that are commercially available for special soil can be used.

  The content of cement contained in the cement-based suspension of the present invention is preferably 500 to 50000 parts by mass, more preferably 1000 to 25,000 parts by mass with respect to 100 parts by mass of the water-soluble polymer (A). .

  The water-cement ratio (hereinafter referred to as "W / C ratio") in the cement-based suspension of the present invention is the quality (clay, silt, sand, gravel) of the soil of the original ground (target soil) and its physical properties ( Although it is suitably selected according to the wet density, water content ratio, liquid property limit etc., and the construction conditions (standard composition, required quality etc.) in each construction method, it is preferably 60 to 350%.

  The cement suspension according to the present invention may contain other components such as bentonite, cypress clay, kaolin clay mineral, lime based solidifying material, neutral solidifying material, weak alkali solidifying material, light-burned magnesia and the like. .

  The cement-based suspension of the present invention can be produced by mixing the fluidizing agent composition for soil cement of the present invention, cement, and water. Also, for example, after mixing a part of the fluidizer composition for soil cement of the present invention and the cement, the remaining part of the fluidizer composition for soil cement of the present invention and water are mixed, for example. You may

  The soil cement of the present invention contains the cement-based suspension of the present invention and soil. That is, the soil cement of the present invention comprises a water-soluble polymer (A), an alkali metal carbonate (B), an alkali metal bicarbonate (C), an alkali metal phosphate (D) and a cement. Contains water and soil.

The soil cement of the present invention can be obtained by mixing a cement-based suspension with the soil of the original ground (underground), and the quality of the soil (target soil) (clay, silt, sand, gravel) and Depending on the physical properties (wet density, water content ratio, liquid property limit, etc.) and construction conditions (standard composition: cement amount, water / cement ratio, injected amount, required quality, etc.) in each construction method, cement system The usage amounts of suspension and soil are set.
In general, the total solid content of the essential components of the fluidizer composition for soil cement contained in the cement-based suspension is preferably 2 to 40 kg per 1 m ^{3 of} soil. If it is less than 2 kg, no effect can be obtained due to the lack of essential ingredients. On the other hand, if it exceeds 40 kg, the desired fluidity retention time can not be obtained, the soil cement does not solidify quickly, and the strength is often significantly reduced.

The total solid content of essential components is specifically shown.
When the soil is a viscous soil, the total solid content of the essential components of the fluidizer composition for soil cement is preferably 8 to 40 kg / m ³ of soil.
When the soil is sandy soil, the total solid content of the essential components of the fluidizer composition for soil cement is preferably 4 to 20 kg / m ³ of soil.
When the soil is a clay soil, the total solid content of the essential components of the soil cement fluidizer composition per m ³ of soil is preferably 2 to 10 kg.
In addition, when the target soil is composed of three soils of cohesive soil, sandy soil and sandy soil, the total solid content of essential components is the total solid content of each soil and the composition ratio of each soil (( The volume ratio may be calculated by weighted averaging. For example, when the mixing ratio of each soil is viscous soil: sandy soil: scaly soil = 1: 1: 1, it will be 4.7-23.3 kg per 1 m ^{3 of} soil.

With respect to the flowability of the soil cement of the present invention, the table flow value according to JIS R5201 is preferably 200 mm or more from the viewpoint of self-weighting and incorporation of the stress material by its own weight.
The time for the table flow value to be less than 200 mm (flowability retention time) after preparation of the soil cement of the present invention is preferably 7 hours or more, more preferably 9 hours or more, particularly preferably 10 hours or more It can be controlled arbitrarily.
In addition, the time until the table flow value becomes less than 150 mm after the soil cement of the present invention is prepared (flowing retention time) is preferably 9 hours or more, more preferably 10 hours or more, particularly preferably 12 hours It can control arbitrarily by the above.

  The soil cement of the present invention can be prepared on the ground (under the ground) or on the ground. The soil cement of the present invention is particularly useful when it is constructed on the ground (in the ground) because it has the above-mentioned fluidity retention time, and in particular, the deep layer mixing method, the middle layer mixing method, etc. Ground improvement method; underground continuous wall method; suitable for foundation pile method such as steel pipe pile method. In addition, also in the backfilling method for creating soil cement on the ground, it is suitable for the work requiring high filling property (self-leveling property, high fluidity).

  The soil cement of the present invention solidifies after losing its fluidity, but the solidified product formed is a solidified product of soil cement which does not contain the fluidizing agent composition for soil cement of the present invention (no-added base compound Compared to the above, for example, even when the fluid holding time is about 24 hours, the uniaxial compressive strength (28-day strength) is equal to or more than that. In this case, it is generally known that, in the case where a conventionally known curing retarder (oxycarboxylic acid, gluconate, etc.) is used, the strength on 28 days is significantly reduced.

  Hereinafter, the present invention will be specifically described by way of examples. However, the present invention is not limited at all to the following examples. In the following, parts and% are based on mass unless otherwise specified.

1. Raw material of fluidizer composition for soil cement (1) Aqueous solution of water-soluble polymer 43.0% aqueous solution (W1) of sodium polyacrylate (A1) having Mw of 6000 by GPC, sodium polyacrylate having Mw of 19000 A 42.1% aqueous solution (W2) of (A2) or a 27.25% aqueous solution (W3) of magnesium polyacrylate (A3) was used.
[GPC measurement conditions]
Device: HLC 8020 system (made by Tosoh Corporation)
Column: Connect G4000PWxl, G3000PWxl and G2500PWxl (made by Tosoh Corporation) Eluent: 0.1 M NaCl + phosphate buffer (pH 7)
Flow rate: 0.8 mL / min Column temperature: 40 ° C
Detector: RI
Reference material: Sodium polyacrylate

(2) Alkali carbonate metal powder powder Sodium carbonate powder was used.
(3) Alkali Metal Bicarbonate Powder Powder Sodium bicarbonate (sodium hydrogen carbonate) powder was used.
(4) Alkali metal salt phosphate powder Sodium tripolyphosphate powder, sodium tetrapolyphosphate powder, sodium hexametaphosphate powder, sodium pyrophosphate powder or sodium orthophosphate (sodium phosphate tribasic) powder was used.
(5) Other Raw Materials Sodium gluconate powder and sucrose powder were used.

2. Production and evaluation of fluidizer for soil cement, cement-based suspension and soil cement The fluidizer for soil cement is produced by using the above-mentioned raw material, and the fluidizer for soil cement obtained, and the following solid deposits Cementitious suspensions and soil cements were produced using cohesive or alluvial cohesive soils.
Diluvial cohesive soil (P): Diluvial cohesive soil with a wet density of 1.700 g / cm ³ and a moisture content of 49.8% collected at Yanagibashi, Tsukuba, Ibaraki Prefecture Diriched cohesive soil / alluvial cohesive soil (R) with a wet density of 1.693 g / cm ³ and a moisture content of 49.9%, collected at Koizumiminami, Shiori, Ibaraki Prefecture: Katsudoki 1-chome, Chuo-ku, Tokyo Alluvial cohesive soil with a wet density of 1.706 g / cm ³ and a moisture content of 47.1%

Example 1
7.0 kg of sodium polyacrylate aqueous solution (W1), 10.5 kg of sodium carbonate powder, 5.25 kg of sodium bicarbonate powder, and 2.10 kg of sodium tripolyphosphate powder were mixed to make a fluidizer for soil cement (S11) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 349 parts, and the content of sodium bicarbonate is 174 parts, 70 parts of sodium tripolyphosphate (see Table 1).
Subsequently, 24.85 kg (solid content 20.86 kg) of the fluidizer for soil cement (S11), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C11). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A1) is 3.01Kg, the content of sodium carbonate is 10.5 kg, the content of sodium bicarbonate 5.25 kg, Cement-based suspension (C11) was added such that the content of sodium tripolyphosphate was 2.10 kg, and these were mixed to obtain soil cement (L11).

Table flow values were measured for the obtained soil cement (L11) in accordance with JIS R5201. That is, the prepared soil cement was packed in a flow cone placed at the center of the flow table, and was poked 15 times using a push rod. Then immediately remove the flow cone vertically, give 15 falling motions for 15 seconds, and measure the diameter after spreading the soil cement to the maximum at 1 mm and the direction recognized as the maximum and the direction perpendicular thereto. This average value is taken as a table flow value.
Moreover, after preparing soil cement (L11), time until a table flow value becomes less than 150 mm and less than 200 mm was calculated | required. Then, the soil cement slurry (L11) is housed in a mold having an inner diameter of 50 mm and a height of 100 mm, sealed for 28 days at 20 ° C., and measured for uniaxial compressive strength of the solidified material according to JIS A1216. did.
The above results are shown in Table 1.

Example 2
A fluidizer for soil cement (hereinafter referred to as "fluidizer for soil cement (S12)") in the same manner as in Example 1 except that sodium tetrapolyphosphate powder was used instead of sodium tripolyphosphate powder. A cement suspension (hereinafter referred to as "cement suspension (C12)") and a soil cement (hereinafter referred to as soil cement (L12)) were obtained (see Table 1).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L12). Then, after the soil cement (L12) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 1.

Example 3
A fluidizer for soil cement (hereinafter referred to as "fluidizer for soil cement (S13)"), cement, in the same manner as in Example 1, except that sodium hexapolyphosphate powder was used instead of sodium tripolyphosphate powder. A system suspension (hereinafter referred to as “cement-based suspension (C13)”) and soil cement (hereinafter referred to as soil cement (L13)) were obtained (see Table 1).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L13). Then, after the soil cement (L13) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 1.

Example 4
A fluidizer for soil cement (hereinafter referred to as "fluidizer for soil cement (S14)"), cement, in the same manner as in Example 1, except that sodium pyrophosphate powder was used instead of sodium tripolyphosphate powder. A system suspension (hereinafter referred to as “cement-based suspension (C14)”) and soil cement (hereinafter referred to as soil cement (L14)) were obtained (see Table 1).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L14). Then, after the soil cement (L14) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 1.

Example 5
A fluidizer for soil cement (hereinafter referred to as "a fluidizer for soil cement (S15)") in the same manner as in Example 1 except that sodium tripolyphosphate powder was used instead of sodium tripolyphosphate powder. A cement-based suspension (hereinafter referred to as “cement-based suspension (C15)”) and a soil cement (hereinafter referred to as soil cement (L15)) were obtained (see Table 1).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L15). And after preparing soil cement (L15), time until a table flow value becomes less than 150 mm and less than 200 mm was calculated | required. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 1.

Example 6
5.50 kg of sodium polyacrylate aqueous solution (W1), 7.86 kg of sodium carbonate powder, 7.86 kg of sodium bicarbonate powder, and 1.96 kg of sodium tripolyphosphate powder were mixed to make a fluidizer for soil cement (S16) Got). When the content of sodium polyacrylate (A1) is 100 parts, the composition of the fluidizer for soil cement (S16) is 332 parts of sodium carbonate, and the content of sodium bicarbonate is 332 parts and 83 parts of sodium tripolyphosphate (see Table 2).
Next, 23.18 kg (solid content: 20.05 kg) of this soil cement fluidizing agent (S16), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C16). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A1) is 2.365Kg, the content of sodium carbonate is 7.86Kg, the content of sodium bicarbonate 7.86Kg, Cement-based suspension (C16) was added such that the content of sodium tripolyphosphate was 1.96 kg, and these were mixed to obtain soil cement (L16).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L16). Then, after the soil cement (L16) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 2.

Example 7
A fluidizer for soil cement (hereinafter referred to as "fluidizer for soil cement (S17)") in the same manner as in Example 6 except that sodium tetrapolyphosphate powder was used instead of sodium tripolyphosphate powder. A cement suspension (hereinafter referred to as "cement suspension (C17)") and a soil cement (hereinafter referred to as soil cement (L17)) were obtained (see Table 2).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L17). Then, after the soil cement (L17) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 2.

Example 8
A fluidizer for soil cement (hereinafter referred to as "fluidizer for soil cement (S18)"), cement, in the same manner as in Example 6, except that sodium hexapolyphosphate powder was used instead of sodium tripolyphosphate powder. A system suspension (hereinafter referred to as “cement-based suspension (C18)”) and soil cement (hereinafter referred to as soil cement (L18)) were obtained (see Table 2).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L18). Then, after the soil cement (L18) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 2.

Example 9
7.0 kg of sodium polyacrylate aqueous solution (W1), 10.0 kg of sodium carbonate powder, 10.0 kg of sodium bicarbonate powder, and 1.25 kg of sodium tripolyphosphate powder were mixed to make a fluidizer for soil cement (S19) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 332 parts and the content of sodium bicarbonate is 332 parts and 42 parts of sodium tripolyphosphate (see Table 2).
Subsequently, 28.25 kg (solid content 24.26 kg) of the fluidizer for soil cement (S19), 170 kg of blast furnace cement B type B, and 442 kg of water were mixed to obtain a cement-based suspension (C19). After that, the content of sodium polyacrylate (A1) is 3.01 kg, the content of sodium carbonate is 10.0 kg, and the content of sodium bicarbonate is 10.0 kg in 1 m ³ of the above-mentioned dillite clay (P). Cement-based suspension (C19) was added such that the content of sodium tripolyphosphate was 1.25 kg, and these were mixed to obtain soil cement (L19).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L19). Then, after the soil cement (L19) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 2.

Example 10
7.0 kg of sodium polyacrylate aqueous solution (W1), 10.0 kg of sodium carbonate powder, 10.0 kg of sodium bicarbonate powder, and 3.75 kg of sodium tripolyphosphate powder were mixed to form a fluidizer for soil cement (S20) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 332 parts and the content of sodium bicarbonate is 332 parts and 125 parts of sodium tripolyphosphate (see Table 2).
Subsequently, 30.75 kg (solid content 26.76 kg) of the fluidizer for soil cement (S20), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C20). After that, the content of sodium polyacrylate (A1) is 3.01 kg, the content of sodium carbonate is 10.0 kg, and the content of sodium bicarbonate is 10.0 kg in 1 m ³ of the above-mentioned dillite clay (P). Cement-based suspension (C20) was added such that the content of sodium tripolyphosphate was 3.75 kg, and these were mixed to obtain soil cement (L20).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L20). And after preparing soil cement (L20), time until a table flow value becomes less than 150 mm and less than 200 mm was calculated | required. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 2.

Example 11
7.0 kg of sodium polyacrylate aqueous solution (W1), 10.0 kg of sodium carbonate powder, 10.0 kg of sodium bicarbonate powder, and 5.0 kg of sodium tripolyphosphate powder were mixed to make a fluidizer for soil cement (S21) Got). When the content of sodium polyacrylate (A1) is 100 parts, the composition of this fluidizer for soil cement (S21) is 332 parts of sodium carbonate, and the content of sodium bicarbonate is 332 parts and 166 parts of sodium tripolyphosphate (see Table 2).
Subsequently, 32.0 kg (solid content 28.01 kg) of the fluidizer for soil cement (S21), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C21). After that, the content of sodium polyacrylate (A1) is 3.01 kg, the content of sodium carbonate is 10.0 kg, and the content of sodium bicarbonate is 10.0 kg in 1 m ³ of the above-mentioned dillite clay (P). Cement-based suspension (C21) was added such that the content of sodium tripolyphosphate was 5.0 kg, and these were mixed to obtain soil cement (L21).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L21). Then, after the soil cement (L21) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 2.

Example 12
7.0 kg of sodium polyacrylate aqueous solution (W2), 10.0 kg of sodium carbonate powder, 10.0 kg of sodium bicarbonate powder, and 2.5 kg of sodium tripolyphosphate powder were mixed to make a fluidizer for soil cement (S22) Got). When the content of sodium polyacrylate (A2) is 100 parts, the content of sodium carbonate is 339 parts and the content of sodium bicarbonate is 339 parts, 85 parts of sodium tripolyphosphate (see Table 2).
Subsequently, 29.5 kg (solid content 25.45 kg) of the fluidizer for soil cement (S22), 170 kg of blast furnace cement B type B, and 442 kg of water were mixed to obtain a cement-based suspension (C22). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A2) is 2.95 kg, the content of sodium carbonate is 10.0 kg, the content of sodium bicarbonate 10.0 kg, Cement-based suspension (C22) was added such that the content of sodium tripolyphosphate was 2.5 kg, and these were mixed to obtain soil cement (L22).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L22). Then, after the soil cement (L22) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 2.

Example 13
2.0 kg of sodium polyacrylate aqueous solution (W1), 10.0 kg of sodium carbonate powder, 10.0 kg of sodium bicarbonate powder, and 2.5 kg of sodium tripolyphosphate powder were mixed to make a fluidizer for soil cement (S23) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 1163 parts, and the content of sodium bicarbonate is It is 1163 parts and 291 parts of sodium tripolyphosphate (see Table 3).
Subsequently, 24.5 kg (solid content 23.36 kg) of the fluidizer for soil cement (S23), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C23). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A1) is 0.86 kg, the content of sodium carbonate is 10.0 kg, the content of sodium bicarbonate 10.0 kg, Cement-based suspension (C23) was added such that the content of sodium tripolyphosphate was 2.5 kg, and these were mixed to obtain soil cement (L23).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L23). Then, after the soil cement (L23) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 3.

Example 14
A fluidizer for soil cement (S24) by mixing 2.5 kg of sodium polyacrylate aqueous solution (W1), 3.6 kg of sodium carbonate powder, 14.4 kg of sodium bicarbonate powder, and 3.5 kg of sodium tripolyphosphate powder Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 335 parts and the content of sodium bicarbonate is It is 1340 parts and 326 parts of sodium tripolyphosphate (see Table 3).
Subsequently, 24.0 kg (solid content 22.58 kg) of the fluidizer for soil cement (S24), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C24). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A1) is 1.075Kg, the content of sodium carbonate is 3.6 kg, the content of sodium bicarbonate 14.4 kg, Cement-based suspension (C24) was added such that the content of sodium tripolyphosphate was 3.5 kg, and these were mixed to obtain soil cement (L24).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L24). Then, after the soil cement (L24) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 3.

Example 15
15.0 kg of sodium polyacrylate aqueous solution (W1), 10.0 kg of sodium carbonate powder, 10.0 kg of sodium bicarbonate powder, and 2.5 kg of sodium tripolyphosphate powder are mixed to make a fluidizer for soil cement (S25) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 155 parts and the content of sodium bicarbonate is 155 parts, 39 parts of sodium tripolyphosphate (see Table 3).
Next, 37.5 kg (solid content: 28.95 kg) of this soil cement fluidizing agent (S25), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C25). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A1) is 6.45Kg, the content of sodium carbonate is 10.0 kg, the content of sodium bicarbonate 10.0 kg, Cement-based suspension (C25) was added so that the content of sodium tripolyphosphate was 2.5 kg, and these were mixed to obtain soil cement (L25).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L25). Then, after the soil cement (L25) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 3.

Example 16
Mix 15.0 kg of sodium polyacrylate aqueous solution (W1), 5.0 kg of sodium carbonate powder, 5.0 kg of sodium bicarbonate powder, and 1.25 kg of sodium tripolyphosphate powder to make a fluidizer for soil cement (S26) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 78 parts and the content of sodium bicarbonate is 78 parts, 19 parts of sodium tripolyphosphate (see Table 3).
Subsequently, 26.25 kg (solid content 17.70 kg) of the fluidizer for soil cement (S26), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C26). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A1) is 6.45Kg, the content of sodium carbonate is 5.0 kg, the content of sodium bicarbonate 5.0 kg, Cement-based suspension (C26) was added such that the content of sodium tripolyphosphate was 1.25 kg, and these were mixed to obtain soil cement (L26).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L26). Then, after the soil cement (L26) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 3.

Example 17
7.0 kg of sodium polyacrylate aqueous solution (W1), 10.5 kg of sodium carbonate powder, 4.5 kg of sodium bicarbonate powder, and 2.24 kg of sodium tripolyphosphate powder were mixed to form a fluidizer for soil cement (S27) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 349 parts and the content of sodium bicarbonate is 150 parts and 74 parts of sodium tripolyphosphate (see Table 3).
Next, 24.24 kg (solid content: 20.25 kg) of this soil cement fluidizing agent (S27), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C27). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A1) is 3.01Kg, the content of sodium carbonate is 10.5 kg, the content of sodium bicarbonate 4.5 kg, Cement-based suspension (C27) was added such that the content of sodium tripolyphosphate was 2.24 kg, and these were mixed to obtain soil cement (L27).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L27). Then, after the soil cement (L27) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 3.

Example 18
7.0 kg of sodium polyacrylate aqueous solution (W1), 10.5 kg of sodium carbonate powder, 9.0 kg of sodium bicarbonate powder, and 2.24 kg of sodium tripolyphosphate powder were mixed to make a fluidizer for soil cement (S28) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 349 parts and the content of sodium bicarbonate is 299 parts, 74 parts of sodium tripolyphosphate (see Table 3).
Next, 28.74 kg (solid content: 24.75 kg) of this soil cement fluidizing agent (S28), 170 kg of blast furnace cement B type B, and 442 kg of water were mixed to obtain a cement-based suspension (C28). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A1) is 3.01Kg, the content of sodium carbonate is 10.5 kg, the content of sodium bicarbonate 9.0 kg, Cement-based suspension (C28) was added such that the content of sodium tripolyphosphate was 2.24 kg, and these were mixed to obtain soil cement (L28).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L28). Then, after the soil cement (L28) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 3.

Example 19
Mix 7.0 kg of sodium polyacrylate aqueous solution (W1), 5.25 kg of sodium carbonate powder, 5.25 kg of sodium bicarbonate powder, and 2.1 kg of sodium tripolyphosphate powder to make a fluidizer for soil cement (S29) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 174 parts, and the content of sodium bicarbonate is 174 parts, 70 parts of sodium tripolyphosphate (see Table 3).
Subsequently, 19.6 kg (solid content 15.61 kg) of the fluidizer for soil cement (S29), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C29). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A1) is 3.01Kg, the content of sodium carbonate is 5.25 kg, the content of sodium bicarbonate 5.25 kg, Cement-based suspension (C29) was added such that the content of sodium tripolyphosphate was 2.1 kg, and these were mixed to obtain soil cement (L29).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L29). Then, after the soil cement (L29) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 3.

Example 20
7.0 kg of sodium polyacrylate aqueous solution (W1), 7.0 kg of sodium carbonate powder, 3.5 kg of sodium bicarbonate powder, and 3.5 kg of sodium tripolyphosphate powder were mixed to make a fluidizer for soil cement (S30) Got). When the content of sodium polyacrylate (A1) is 100 parts, the composition of the fluidizer for soil cement (S30) is 233 parts of sodium carbonate, and the content of sodium bicarbonate is 116 parts and 116 parts of sodium tripolyphosphate (see Table 3).
Subsequently, 21.0 kg (solid content 17.01 kg) of the fluidizer for soil cement (S30), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C30). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A1) is 3.01Kg, the content of sodium carbonate is 7.0 kg, the content of sodium bicarbonate 3.5 kg, Cement-based suspension (C30) was added such that the content of sodium tripolyphosphate was 3.5 kg, and these were mixed to obtain soil cement (L30).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L30). Then, after the soil cement (L30) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 3.

Example 21
7.0 kg of sodium polyacrylate aqueous solution (W1), 4.0 kg of sodium carbonate powder, 16.0 kg of sodium bicarbonate powder, and 2.5 kg of sodium tripolyphosphate powder were mixed to make a fluidizer for soil cement (S31) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 133 parts and the content of sodium bicarbonate is 532 parts and 83 parts of sodium tripolyphosphate (see Table 4).
Subsequently, 29.5 kg (solid content 25.51 kg) of the fluidizer for soil cement (S31), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C31). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A1) is 3.01Kg, the content of sodium carbonate is 4.0 kg, the content of sodium bicarbonate 16.0 kg, Cement-based suspension (C31) was added such that the content of sodium tripolyphosphate was 2.5 kg, and these were mixed to obtain soil cement (L31).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L31). Then, after the soil cement (L31) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The results are shown in Table 4.

Example 22
7.0 kg of sodium polyacrylate aqueous solution (W1), 8.0 kg of sodium carbonate powder, 12.0 kg of sodium bicarbonate powder, and 2.5 kg of sodium tripolyphosphate powder were mixed to make a fluidizer for soil cement (S32) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 266 parts and the content of sodium bicarbonate is 399 parts and 83 parts of sodium tripolyphosphate (see Table 4).
Subsequently, 29.5 kg (solid content 25.51 kg) of the fluidizer for soil cement (S32), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C32). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A1) is 3.01Kg, the content of sodium carbonate is 8.0 kg, the content of sodium bicarbonate 12.0 kg, Cementitious suspension (C32) was added so that the content of sodium tripolyphosphate was 2.5 kg, and these were mixed to obtain soil cement (L32).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L32). Then, after the soil cement (L32) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The results are shown in Table 4.

Example 23
7.0 kg of sodium polyacrylate aqueous solution (W1), 12.0 kg of sodium carbonate powder, 8.0 kg of sodium bicarbonate powder, and 2.5 kg of sodium tripolyphosphate powder were mixed to make a fluidizer for soil cement (S33) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 399 parts and the content of sodium bicarbonate is 266 parts, 83 parts of sodium tripolyphosphate (see Table 4).
Subsequently, 29.5 kg (solid content 25.51 kg) of the fluidizer for soil cement (S33), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C33). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A1) is 3.01Kg, the content of sodium carbonate is 12.0 kg, the content of sodium bicarbonate 8.0 kg, Cement-based suspension (C33) was added such that the content of sodium tripolyphosphate was 2.5 kg, and these were mixed to obtain soil cement (L33).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L33). Then, after the soil cement (L33) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The results are shown in Table 4.

Example 24
7.0 kg of sodium polyacrylate aqueous solution (W1), 16.0 kg of sodium carbonate powder, 4.0 kg of sodium bicarbonate powder, and 2.5 kg of sodium tripolyphosphate powder were mixed to make a fluidizer for soil cement (S34) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 532 parts and the content of sodium bicarbonate is 133 parts, 83 parts of sodium tripolyphosphate (see Table 4).
Subsequently, 29.5 kg (solid content 25.51 kg) of the fluidizer for soil cement (S34), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C34). After that, the content of sodium polyacrylate (A1) is 3.01 kg, the content of sodium carbonate is 16.0 kg, and the content of sodium bicarbonate is 4.0 kg in 1 m ³ of the above-mentioned diluvial clay soil (P). Cement-based suspension (C34) was added so that the content of sodium tripolyphosphate was 2.5 kg, and these were mixed to obtain soil cement (L34).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L34). Then, after the soil cement (L34) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The results are shown in Table 4.

Example 25
A fluidizer for soil cement (S35) by mixing 3.5 kg of sodium polyacrylate aqueous solution (W1), 10.0 kg of sodium carbonate powder, 10.0 kg of sodium bicarbonate powder, and 2.5 kg of sodium tripolyphosphate powder Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 664 parts and the content of sodium bicarbonate is It is 664 parts and 166 parts of sodium tripolyphosphate (see Table 4).
Subsequently, 26.0 kg (solid content 24.01 kg) of the fluidizer for soil cement (S35), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C35). After that, the content of sodium polyacrylate (A1) is 3.01 kg, the content of sodium carbonate is 10.0 kg, and the content of sodium bicarbonate is 10.0 kg in 1 m ³ of the above-mentioned dillite clay (P). Cement-based suspension (C35) was added such that the content of sodium tripolyphosphate was 2.5 kg, and these were mixed to obtain soil cement (L35).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L35). Then, after the soil cement (L35) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The results are shown in Table 4.

Example 26
A fluidizer for soil cement (S36) by mixing 3.5 kg of sodium polyacrylate aqueous solution (W2), 10.0 kg of sodium carbonate powder, 10.0 kg of sodium bicarbonate powder, and 2.5 kg of sodium tripolyphosphate powder Got). When the content of sodium polyacrylate (A2) is 100 parts, the content of sodium carbonate is 678 parts and the content of sodium bicarbonate is It is 678 parts and 169 parts of sodium tripolyphosphate (see Table 4).
Next, 26.0 kg (solid content 23.97 kg) of the soil cement fluidizing agent (S36), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C36). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A2) is 1.47 kg, the content of sodium carbonate is 10.0 kg, the content of sodium bicarbonate 10.0 kg, Cementitious suspension (C36) was added so that the content of sodium tripolyphosphate was 2.5 kg, and these were mixed to obtain soil cement (L36).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L36). Then, after the soil cement (L36) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The results are shown in Table 4.

Comparative Example 1
Soil cement was obtained by mixing 170 kg of blast furnace cement type B and 442 kg of water with 1 m ³ of the above-mentioned diluvial cohesive soil (P). And after preparing soil cement, time until table flow value becomes less than 150 mm and less than 200 mm was calculated. In addition, the uniaxial compressive strength of the solidified material was measured.
The results are shown in Table 4.

Comparative example 2
7.0 kg of sodium polyacrylate aqueous solution (W1) and 10.5 kg of sodium carbonate powder were mixed to obtain a soil cement fluidizing agent (S37). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 349 parts (see Table 4).
Subsequently, 17.5 kg (solid content 13.51 kg) of the fluidizer for soil cement (S37), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C37). Thereafter, the diluvial in cohesive soil (P) 1 m ^3, poly content of sodium acrylate (A1) is 3.01Kg, so that the content of sodium carbonate is 10.5 kg, cementitious suspension (C37 ) Were added and mixed to obtain soil cement (L37).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L37). Then, after the soil cement (L37) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The results are shown in Table 4.

Comparative example 3
7.0 kg of sodium polyacrylate aqueous solution (W1), 10.5 kg of sodium carbonate powder, and 5.25 kg of sodium bicarbonate powder were mixed to obtain a soil cement fluidizing agent (S38). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 349 parts, and the content of sodium bicarbonate is There are 174 copies (see Table 4).
Subsequently, 22.75 kg (solid content 18.76 kg) of the fluidizer for soil cement (S38), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C38). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, poly content of sodium acrylate (A1) is 3.01Kg, the content of sodium carbonate is 10.5 kg, the content of sodium bicarbonate and 5.25kg A cement-based suspension (C38) was added and mixed to obtain soil cement (L38).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L38). Then, after the soil cement (L38) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The results are shown in Table 4.

Comparative example 4
7.0 kg of sodium polyacrylate aqueous solution (W1), 25.0 kg of sodium carbonate powder, and 2.5 kg of sodium tripolyphosphate powder were mixed to obtain a fluidizer for soil cement (S39). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 831 parts and the content of sodium tripolyphosphate is: There are 83 parts (see Table 4).
Subsequently, 34.5 kg (solid content 30.51 kg) of the fluidizer for soil cement (S39), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C39). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, poly content of sodium acrylate (A1) is 3.01Kg, the content of sodium carbonate is 25.0 kg, the content of sodium tripolyphosphate and 2.5kg A cement-based suspension (C39) was added and mixed to obtain soil cement (L39).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L39). Then, after the soil cement (L39) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The results are shown in Table 4.

Comparative example 5
7.0 kg of sodium polyacrylate aqueous solution (W1), 39.13 kg of sodium carbonate powder, 39.13 kg of sodium bicarbonate powder, and 2.5 kg of sodium tripolyphosphate powder were mixed to form a fluidizer for soil cement (S40) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 1300 parts, and the content of sodium bicarbonate is It is 1300 parts, and the content of sodium tripolyphosphate is 83 parts (see Table 4).
Subsequently, 87.76 kg (solid content 83.77 kg) of the fluidizer for soil cement (S40), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C40). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A1) is 3.01Kg, the content of sodium carbonate 39.13Kg, the content of sodium bicarbonate 39.13Kg, Cementitious suspension (C40) was added so that the content of sodium tripolyphosphate was 2.5 kg, and these were mixed to obtain soil cement (L40).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L40). Then, after the soil cement (L40) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. Moreover, although it was going to measure uniaxial compressive strength of a solidified thing, it did not solidify and it was not able to measure.
The results are shown in Table 4.

Comparative example 6
Mix 7.0 kg of sodium polyacrylate aqueous solution (W1), 10.5 kg of sodium carbonate powder, 5.25 kg of sodium bicarbonate powder, and 2.1 kg of sodium gluconate powder to make a fluidizer for soil cement (S41) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 349 parts, and the content of sodium bicarbonate is It is 174 parts, and the content of sodium gluconate is 70 parts (see Table 4).
Subsequently, 24.85 kg (solid content 20.86 kg) of the fluidizer for soil cement (S41), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C41). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A1) is 3.01Kg, the content of sodium carbonate is 10.5 kg, the content of sodium bicarbonate 5.25 kg, Cement-based suspension (C41) was added such that the content of sodium gluconate was 2.1 kg, and these were mixed to obtain soil cement (L41).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L41). Then, after the soil cement (L41) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The results are shown in Table 4.

Comparative example 7
A fluidizer for soil cement (S42) by mixing 5.5 kg of sodium polyacrylate aqueous solution (W1), 7.86 kg of sodium carbonate powder, 7.86 kg of sodium bicarbonate powder, and 1.96 kg of sodium gluconate powder. Got). When the content of sodium polyacrylate (A1) is 100 parts, the composition of this fluidizer for soil cement (S42) is 332 parts of sodium carbonate, and the content of sodium bicarbonate is It is 332 parts and the content of sodium gluconate is 83 parts (see Table 4).
Next, 23.18 kg (solid content: 20.05 kg) of this soil cement fluidizing agent (S42), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C42). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, the content of sodium polyacrylate (A1) is 2.365Kg, the content of sodium carbonate is 7.86Kg, the content of sodium bicarbonate 7.86Kg, Cement-based suspension (C42) was added such that the content of sodium gluconate was 1.96 kg, and these were mixed to obtain soil cement (L42).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L42). Then, after the soil cement (L42) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The results are shown in Table 4.

Comparative Example 8
Mix 5.5 kg of sodium polyacrylate aqueous solution (W1), 7.86 kg of sodium carbonate powder, 7.86 kg of sodium bicarbonate powder, and 1.96 kg of saccharose powder, and use as a fluidizer for soil cement (S43) Obtained. When the content of sodium polyacrylate (A1) is 100 parts, the composition of this fluidizer for soil cement (S43) is 332 parts of sodium carbonate, and the content of sodium bicarbonate is It is 332 parts, and the content of sucrose is 83 parts (see Table 4).
Next, 21.22 kg (solid content: 20.05 kg) of the fluidizer for soil cement (S43), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C43). Thereafter, the above diluvial cohesive soil (P) 1 m ^3, poly content of sodium acrylate (A1) is 2.365Kg, the content of sodium carbonate is 7.86Kg, the content of sodium bicarbonate and 7.86Kg A cement-based suspension (C43) was added and mixed to obtain soil cement (L43).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L43). Then, after the soil cement (L43) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The results are shown in Table 4.

Example 27
A fluidizer for soil cement (S44) by mixing 5.0 kg of sodium polyacrylate aqueous solution (W1), 3.75 kg of sodium carbonate powder, 3.75 kg of sodium bicarbonate powder, and 2.0 kg of sodium tripolyphosphate powder. Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 174 parts and the content of sodium bicarbonate is 174 parts, 93 parts of sodium tripolyphosphate (see Table 5).
Next, 14.5 kg (solid content 11.65 kg) of the soil cement fluidizing agent (S44), 160 kg of blast furnace cement type B, and 480 kg of water were mixed to obtain a cement-based suspension (C44). Thereafter, the above diluvial cohesive soil (Q) 1 m ^3, the content of sodium polyacrylate (A1) is 2.15 kg, the content of sodium carbonate is 3.75 kg, the content of sodium bicarbonate 3.75 kg, Cementitious suspension (C44) was added so that the content of sodium tripolyphosphate was 2.0 kg, and these were mixed to obtain soil cement (L44).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L44). Then, after the soil cement (L44) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 5.

Example 28
5.0 kg of sodium polyacrylate aqueous solution (W1), 7.5 kg of sodium carbonate powder, 7.5 kg of sodium bicarbonate powder, and 2.0 kg of sodium tripolyphosphate powder were mixed to make a fluidizer for soil cement (S 45) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 349 parts and the content of sodium bicarbonate is It is 349 parts and 93 parts of sodium tripolyphosphate (see Table 5).
Subsequently, 22.0 kg (solid content 19.15 kg) of the fluidizer for soil cement (S45), 160 kg of blast furnace cement type B, and 480 kg of water were mixed to obtain a cement-based suspension (C45). Thereafter, the above diluvial cohesive soil (Q) 1 m ^3, the content of sodium polyacrylate (A1) is 2.15 kg, the content of sodium carbonate is 7.5 kg, the content of sodium bicarbonate 7.5 kg, Cement-based suspension (C45) was added such that the content of sodium tripolyphosphate was 2.0 kg, and these were mixed to obtain soil cement (L45).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L45). Then, after the soil cement (L45) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 5.

Example 29
A fluidizer for soil cement (S46) by mixing 3.0 kg of sodium polyacrylate aqueous solution (W1), 10.0 kg of sodium carbonate powder, 10.0 kg of sodium bicarbonate powder, and 2.0 kg of sodium tripolyphosphate powder Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 775 parts, and the content of sodium bicarbonate is It is 775 parts and 155 parts of sodium tripolyphosphate (see Table 5).
Subsequently, 25.0 kg (solid content 23.29 kg) of the fluidizer for soil cement (S46), 160 kg of blast furnace cement type B, and 480 kg of water were mixed to obtain a cement-based suspension (C46). Thereafter, the above diluvial cohesive soil (Q) 1 m ^3, the content of sodium polyacrylate (A1) is 1.29 kg, the content of sodium carbonate is 10.0 kg, the content of sodium bicarbonate 10.0 kg, Cementitious suspension (C46) was added such that the content of sodium tripolyphosphate was 2.0 kg, and these were mixed to obtain soil cement (L46).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L46). Then, after the soil cement (L46) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 5.

Example 30
A fluidizer for soil cement (S47) by mixing 3.0 kg of sodium polyacrylate aqueous solution (W1), 12.5 kg of sodium carbonate powder, 12.5 kg of sodium bicarbonate powder, and 2.0 kg of sodium tripolyphosphate powder Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 969 parts and the content of sodium bicarbonate is 969 parts, 155 parts of sodium tripolyphosphate (see Table 5).
Subsequently, 30.0 kg (solid content 28.29 kg) of the fluidizer for soil cement (S47), 160 kg of blast furnace cement type B, and 480 kg of water were mixed to obtain a cement-based suspension (C47). Thereafter, the above diluvial cohesive soil (Q) 1 m ^3, the content of sodium polyacrylate (A1) is 1.29 kg, the content of sodium carbonate is 12.5 kg, the content of sodium bicarbonate 12.5 kg, Cement-based suspension (C47) was added such that the content of sodium tripolyphosphate was 2.0 kg, and these were mixed to obtain soil cement (L47).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L47). Then, after the soil cement (L47) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 5.

Example 31
15.0 kg of sodium polyacrylate aqueous solution (W1), 5.0 kg of sodium carbonate powder, 5.0 kg of sodium bicarbonate powder, and 0.75 kg of sodium tripolyphosphate powder are mixed to make a fluidizer for soil cement (S48) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 78 parts and the content of sodium bicarbonate is 78 parts, 12 parts of sodium tripolyphosphate (see Table 5).
Subsequently, 25.75 kg (solid content 17.20 kg) of the fluidizer for soil cement (S48), 160 kg of blast furnace cement type B, and 480 kg of water were mixed to obtain a cement-based suspension (C48). Thereafter, the above diluvial cohesive soil (Q) 1 m ^3, the content of sodium polyacrylate (A1) is 6.45Kg, the content of sodium carbonate is 5.0 kg, the content of sodium bicarbonate 5.0 kg, Cementitious suspension (C48) was added so that the content of sodium tripolyphosphate was 0.75 kg, and these were mixed to obtain soil cement (L48).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L48). And after preparing soil cement (L48), time until table flow value becomes less than 150 mm and less than 200 mm was calculated | required. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 5.

Example 32
A fluidizer for soil cement (S49) by mixing 3.0 kg of sodium polyacrylate aqueous solution (W1), 7.5 kg of sodium carbonate powder, 7.5 kg of sodium bicarbonate powder, and 1.0 kg of sodium tripolyphosphate powder Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 581 parts and the content of sodium bicarbonate is 581 parts and 78 parts of sodium tripolyphosphate (see Table 5).
Subsequently, 19.0 kg (solid content 17.29 kg) of the fluidizer for soil cement (S49), 160 kg of blast furnace cement type B, and 480 kg of water were mixed to obtain a cement-based suspension (C49). Thereafter, the above diluvial cohesive soil (Q) 1 m ^3, the content of sodium polyacrylate (A1) is 1.29 kg, the content of sodium carbonate is 7.5 kg, the content of sodium bicarbonate 7.5 kg, Cementitious suspension (C49) was added so that the content of sodium tripolyphosphate was 1.0 kg, and these were mixed to obtain soil cement (L49).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L49). Then, after the soil cement (L49) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 5.

Example 33
A fluidizer for soil cement (S50) by mixing 3.0 kg of sodium polyacrylate aqueous solution (W1), 7.5 kg of sodium carbonate powder, 7.5 kg of sodium bicarbonate powder, and 3.5 kg of sodium tripolyphosphate powder Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 581 parts and the content of sodium bicarbonate is 581 parts, 271 parts of sodium tripolyphosphate (see Table 5).
Subsequently, 21.5 kg (solid content 19.79 kg) of the fluidizer for soil cement (S50), 160 kg of blast furnace cement type B, and 480 kg of water were mixed to obtain a cement-based suspension (C50). Thereafter, the above diluvial cohesive soil (Q) 1 m ^3, the content of sodium polyacrylate (A1) is 1.29 kg, the content of sodium carbonate is 7.5 kg, the content of sodium bicarbonate 7.5 kg, Cement-based suspension (C50) was added such that the content of sodium tripolyphosphate was 3.5 kg, and these were mixed to obtain soil cement (L50).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L50). Then, after the soil cement (L50) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 5.

Example 34
A fluidizer for soil cement (S51) by mixing 5.0 kg of sodium polyacrylate aqueous solution (W2), 7.5 kg of sodium carbonate powder, 7.5 kg of sodium bicarbonate powder, and 2.0 kg of sodium tripolyphosphate powder Got). When the content of sodium polyacrylate (A2) is 100 parts, the content of sodium carbonate is 356 parts and the content of sodium bicarbonate is It is 356 parts and 95 parts of sodium tripolyphosphate (see Table 5).
Subsequently, 22.0 kg (solid content 19.11 kg) of the fluidizer for soil cement (S51), 160 kg of blast furnace cement type B, and 480 kg of water were mixed to obtain a cement-based suspension (C51). Thereafter, the above diluvial cohesive soil (Q) 1 m ^3, the content of sodium polyacrylate (A2) is 2.11 kg, the content of sodium carbonate is 7.5 kg, the content of sodium bicarbonate 7.5 kg, Cement-based suspension (C51) was added such that the content of sodium tripolyphosphate was 2.0 kg, and these were mixed to obtain soil cement (L51).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L51). Then, after the soil cement (L51) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 5.

Example 35
7.89 kg of polyacrylic acid aqueous solution (W3), 7.5 kg of sodium carbonate powder, 7.5 kg of sodium bicarbonate powder, and 2.0 kg of sodium tripolyphosphate powder were mixed to make a fluidizer for soil cement (S52) Got). When the content of magnesium polyacrylate (A3) is 100 parts, the content of sodium carbonate is 349 parts, and the content of sodium bicarbonate is It is 349 parts and 93 parts of sodium tripolyphosphate (see Table 5).
Subsequently, 24.89 kg (solid content 19.15 kg) of the fluidizer for soil cement (S52), 160 kg of blast furnace cement type B, and 480 kg of water were mixed to obtain a cement-based suspension (C52). Thereafter, the above diluvial cohesive soil (Q) 1 m ^3, the content of magnesium polyacrylic acid (A3) is 2.15 kg, the content of sodium carbonate is 7.5 kg, the content of sodium bicarbonate 7.5 kg, Cement-based suspension (C52) was added such that the content of sodium tripolyphosphate was 2.0 kg, and these were mixed to obtain soil cement (L52).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L52). Then, after the soil cement (L52) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 5.

Comparative Example 9
Soil cement was obtained by mixing 160 kg of blast-furnace cement type B and 480 kg of water with 1 m ³ of the above-mentioned diluvial cohesive soil (Q). And after preparing soil cement, time until table flow value becomes less than 150 mm and less than 200 mm was calculated. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 6.

Comparative example 10
5.0 kg of sodium polyacrylate aqueous solution (W1) and 7.5 kg of sodium carbonate powder were mixed to obtain a soil cement fluidizing agent (S53). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 349 parts (see Table 6).
Subsequently, 12.5 kg (solid content 9.65 kg) of the fluidizer for soil cement (S53), 160 kg of blast furnace cement type B, and 480 kg of water were mixed to obtain a cement-based suspension (C53). Then, a cement-based suspension (C53) is prepared so that the content of sodium polyacrylate (A1) is 2.15 kg and the content of sodium carbonate is 7.5 kg in 1 m ³ of the above-mentioned diluvial clay (Q) Soil cement (L53) was obtained by adding and mixing these.
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L53). Then, after the soil cement (L53) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 6.

Comparative example 11
5.0 kg of sodium polyacrylate aqueous solution (W1) and 20.0 kg of sodium carbonate powder were mixed to obtain a soil cement fluidizing agent (S54). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 930 parts (see Table 6).
Subsequently, 25.0 kg (solid content 22.15 kg) of the fluidizer for soil cement (S54), 160 kg of blast furnace cement type B, and 480 kg of water were mixed to obtain a cement-based suspension (C54). Thereafter, the diluvial in cohesive soil (Q) 1 m ^3, poly content of sodium acrylate (A1) is 2.15 kg, so that the content of sodium carbonate is 20.0 kg, cementitious suspension (C54 ) Were added and mixed to obtain soil cement (L54).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L54). Then, after the soil cement (L54) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 6.

Comparative Example 12
5.0 kg of sodium polyacrylate aqueous solution (W1) and 7.5 kg of sodium bicarbonate powder were mixed to obtain a soil cement fluidizing agent (S55). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium bicarbonate is 349 parts (see Table 6).
Subsequently, 12.5 kg (solid content 9.65 kg) of the fluidizer for soil cement (S55), 160 kg of blast furnace cement type B, and 480 kg of water were mixed to obtain a cement-based suspension (C55). Then, a cement-based suspension is prepared such that the content of sodium polyacrylate (A1) is 2.15 kg and the content of sodium bicarbonate is 7.5 kg in 1 m ³ of the above-mentioned dillite clay (Q). C55) was added and mixed to obtain soil cement (L55).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L55). Then, after the soil cement (L55) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 6.

Comparative Example 13
5.0 kg of sodium polyacrylate aqueous solution (W1) and 20.0 kg of sodium bicarbonate powder were mixed to obtain a soil cement fluidizing agent (S56). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium bicarbonate is 930 parts (see Table 6).
Subsequently, 25.0 kg (solid content 22.15 kg) of the fluidizer for soil cement (S56), 160 kg of blast furnace cement type B, and 480 kg of water were mixed to obtain a cement-based suspension (C56). Then, a cement-based suspension is prepared such that the content of sodium polyacrylate (A1) is 2.15 kg and the content of sodium bicarbonate is 20.0 kg in 1 m ³ of the above-mentioned dillite clay (Q). C56) was added and mixed to obtain soil cement (L56).
Table flow values were measured for the obtained soil cement (L56) in the same manner as in Example 1. Then, after the soil cement (L56) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 6.

Comparative Example 14
A fluidizer for soil cement (S57) by mixing 1.25 kg of sodium polyacrylate aqueous solution (W1), 7.5 kg of sodium carbonate powder, 7.5 kg of sodium bicarbonate powder, and 2.0 kg of sodium tripolyphosphate powder Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 1395 parts and the content of sodium bicarbonate is It is 1395 parts and 372 parts of sodium tripolyphosphate (see Table 6).
Subsequently, 18.25 kg (solid content 17.54 kg) of the fluidizer for soil cement (S57), 160 kg of blast furnace cement type B, and 480 kg of water were mixed to obtain a cement-based suspension (C57). Thereafter, the above diluvial cohesive soil (Q) 1 m ^3, the content of sodium polyacrylate (A1) is 0.54 kg, the content of sodium carbonate is 7.5 kg, the content of sodium bicarbonate 7.5 kg, Cement-based suspension (C57) was added such that the content of sodium tripolyphosphate was 2.0 kg, and these were mixed to obtain soil cement (L57).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L57). Then, after the soil cement (L57) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 6.

Comparative example 15
A fluidizer for soil cement (S58) by mixing 5.0 kg of sodium polyacrylate aqueous solution (W1), 0.75 kg of sodium carbonate powder, 0.75 kg of sodium bicarbonate powder, and 2.0 kg of sodium tripolyphosphate powder. Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 35 parts and the content of sodium bicarbonate is 35 parts, 93 parts of sodium tripolyphosphate (see Table 6).
Next, 8.5 kg (solid content 5.65 kg) of the soil cement fluidizing agent (S58), 160 kg of blast furnace cement type B, and 480 kg of water were mixed to obtain a cement-based suspension (C58). Thereafter, the above diluvial cohesive soil (Q) 1 m ^3, the content of sodium polyacrylate (A1) is 2.15 kg, the content of sodium carbonate is 0.75 kg, the content of sodium bicarbonate 0.75 kg, Cement-based suspension (C58) was added so that the content of sodium tripolyphosphate was 2.0 kg, and these were mixed to obtain soil cement (L58).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L58). Then, after the soil cement (L58) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 6.

Comparative example 16
A fluidizer for soil cement (S59) by mixing 3.0 kg of sodium polyacrylate aqueous solution (W1), 7.5 kg of sodium carbonate powder, 7.5 kg of sodium bicarbonate powder, and 1.0 kg of sodium gluconate powder. Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 581 parts and the content of sodium bicarbonate is 581 parts, 78 parts of sodium gluconate (see Table 6).
Subsequently, 19.0 kg (solid content 17.29 kg) of the fluidizer for soil cement (S59), 160 kg of blast furnace cement type B, and 480 kg of water were mixed to obtain a cement-based suspension (C59). Thereafter, the above diluvial cohesive soil (Q) 1 m ^3, the content of sodium polyacrylate (A1) is 1.29 kg, the content of sodium carbonate is 7.5 kg, the content of sodium bicarbonate 7.5 kg, Cement-based suspension (C59) was added such that the content of sodium gluconate was 1.0 kg, and these were mixed to obtain soil cement (L59).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L59). Then, after the soil cement (L59) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 6.

Example 36
7.0 kg of sodium polyacrylate aqueous solution (W1), 10.0 kg of sodium carbonate powder, 10.0 kg of sodium bicarbonate powder, and 1.0 kg of sodium tripolyphosphate powder were mixed to make a fluidizer for soil cement (S60) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 332 parts and the content of sodium bicarbonate is 332 parts and 33 parts of sodium tripolyphosphate (see Table 7).
Subsequently, 28.0 kg (solid content 24.01 kg) of the fluidizer for soil cement (S60), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C60). Thereafter, to the alluvial cohesive soil (R) 1 m ^3, poly content of sodium acrylate (A1) is 3.01Kg, the content of sodium carbonate is 10.0 kg, the content of sodium bicarbonate 10.0 kg, tripolyphosphate Cement-based suspension (C60) was added such that the content of sodium acid was 1.0 kg, and these were mixed to obtain soil cement (L60).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L60). Then, after the soil cement (L60) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 7.

Example 37
7.0 kg of sodium polyacrylate aqueous solution (W1), 10.0 kg of sodium carbonate powder, 10.0 kg of sodium bicarbonate powder, and 2.0 kg of sodium tripolyphosphate powder were mixed to make a fluidizer for soil cement (S61) Got). When the content of sodium polyacrylate (A1) is 100 parts, the composition of the fluidizer for soil cement (S61) is 332 parts of sodium carbonate and the content of sodium bicarbonate is 332 parts and 66 parts of sodium tripolyphosphate (see Table 7).
Subsequently, 29.0 kg (solid content 25.01 kg) of the fluidizer for soil cement (S61), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C61). Thereafter, to the alluvial cohesive soil (R) 1 m ^3, poly content of sodium acrylate (A1) is 3.01Kg, the content of sodium carbonate is 10.0 kg, the content of sodium bicarbonate 10.0 kg, tripolyphosphate Cement-based suspension (C61) was added such that the content of sodium acid was 2.0 kg, and these were mixed to obtain soil cement (L61).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L61). Then, after the soil cement (L61) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 7.

Example 38
7.0 kg of sodium polyacrylate aqueous solution (W1), 10.0 kg of sodium carbonate powder, 10.0 kg of sodium bicarbonate powder, and 3.0 kg of sodium tripolyphosphate powder were mixed to make a fluidizer for soil cement (S62) Got). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 332 parts and the content of sodium bicarbonate is 332 parts and 100 parts of sodium tripolyphosphate (see Table 7).
Subsequently, 30.0 kg (solid content 26.01 kg) of the fluidizer for soil cement (S62), 170 kg of blast furnace cement B type B, and 442 kg of water were mixed to obtain a cement-based suspension (C62). Thereafter, to the alluvial cohesive soil (R) 1 m ^3, poly content of sodium acrylate (A1) is 3.01Kg, the content of sodium carbonate is 10.0 kg, the content of sodium bicarbonate 10.0 kg, tripolyphosphate Cement-based suspension (C62) was added such that the content of sodium acid was 3.0 kg, and these were mixed to obtain soil cement (L62).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L62). Then, after the soil cement (L62) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 7.

Comparative Example 17
7.0 kg of sodium polyacrylate aqueous solution (W1) and 10.5 kg of sodium carbonate powder were mixed to obtain a soil cement fluidizing agent (S63). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 349 parts (see Table 7).
Subsequently, 17.5 kg (solid content 13.51 kg) of this soil cement fluidizing agent (S63), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C63). Thereafter, the alluvial cohesive soil in (R) 1 m ^3, the content of sodium polyacrylate (A1) is 3.01Kg, so that the content of sodium carbonate is 10.5 kg, cementitious suspension (C63) Were added and mixed to obtain soil cement (L63).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L63). Then, after the soil cement (L63) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 7.

Comparative Example 18
7.0 kg of sodium polyacrylate aqueous solution (W1), 10.0 kg of sodium carbonate powder, and 10.0 kg of sodium bicarbonate powder were mixed to obtain a fluidizer for soil cement (S64). When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 332 parts and the content of sodium bicarbonate is There are 332 parts (see Table 7).
Subsequently, 27.0 kg (solid content 23.01 kg) of the fluidizer for soil cement (S64), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C64). After that, the content of sodium polyacrylate (A1) is 3.01 kg, the content of sodium carbonate is 10.0 kg, and the content of sodium bicarbonate is 10.0 kg in 1 m ³ of the alluvial clay soil (R). As such, cement-based suspension (C64) was added and mixed to obtain soil cement (L64).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L64). Then, after the soil cement (L64) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. In addition, the uniaxial compressive strength of the solidified material was measured.
The above results are shown in Table 7.

Comparative example 19
A fluidizer for soil cement (S65) by mixing 5.0 kg of sodium polyacrylate aqueous solution (W1), 28.0 kg of sodium carbonate powder, 28.0 kg of sodium bicarbonate powder, and 18.3 kg of sodium tripolyphosphate I got When the content of sodium polyacrylate (A1) is 100 parts, the content of sodium carbonate is 1302 parts and the content of sodium bicarbonate is It is 1302 parts, and the content of sodium tripolyphosphate is 851 parts (see Table 7).
Subsequently, 79.3 kg (solid content 76.45 kg) of the fluidizer for soil cement (S65), 170 kg of blast furnace cement type B, and 442 kg of water were mixed to obtain a cement-based suspension (C65). Thereafter, to the alluvial cohesive soil (R) 1 m ^3, poly content of sodium acrylate (A1) is 2.15 kg, the content of sodium carbonate is 28.0Kg, the content of sodium bicarbonate 28.0Kg, tripolyphosphate Cementitious suspension (C65) was added so that the content of sodium acid would be 18.3 kg, and these were mixed to obtain soil cement (L65).
Table flow values were measured in the same manner as in Example 1 for the obtained soil cement (L65). Then, after the soil cement (L65) was prepared, the time until the table flow value became less than 150 mm and less than 200 mm was determined. Moreover, although it was going to measure uniaxial compressive strength of a solidified thing, it did not solidify and it was not able to measure.
The above results are shown in Table 7.

  From Table 1 to Table 7, the soil cement obtained using the fluidizer for soil cement and the cement-based suspension in Examples 1 to 38 has a table flow value of less than 200 mm from the time of preparing it. It is clear that the time to 7 hours or more can be made and the time until the table flow value becomes less than 150 mm can be made 9 hours or more.

  The fluidizer composition for soil cement, cement-based suspension and soil cement according to the present invention are a ground improvement method, a continuous continuous wall method, a foundation pile method, a backfill method using the soil of the original ground (under the ground) It is suitable for the construction method etc.

Claims (7)

(A) water soluble polymer,
(B) alkali metal carbonates,
(C) an alkali metal bicarbonate,
as well as,
(D) A fluidizer composition for soil cement containing an alkali metal phosphate,
The water-soluble polymer (A) is a structural unit derived from a monomer having an ethylenically unsaturated bond, and is a polymer containing a structural unit having a COO bond and having a weight average molecular weight of 50,000 or less. ,
The content of the alkali metal carbonate (B), the alkali metal bicarbonate (C), and the alkali metal phosphate (D) is 100 parts by mass of the water-soluble polymer (A), 50 to 1350 parts by mass, 50 to 1350 parts by mass, and 1 to 600 parts by mass, respectively
The total content of the alkali metal carbonate (B) and the alkali metal bicarbonate (C) is 100 to 2500 parts by mass with respect to 100 parts by mass of the water-soluble polymer (A) The fluidizer composition for soil cements characterized by the above-mentioned.   The fluidizer composition for soil cement according to claim 1, wherein the water-soluble polymer (A) is a polymer containing a structural unit derived from acrylic acid or a salt thereof. The fluidizer composition for soil cement according to claim 1 or 2 , wherein the alkali metal carbonate (B) is sodium carbonate and the alkali metal bicarbonate (C) is sodium bicarbonate. The alkali metal phosphate (D) is an alkali metal salt of tripolyphosphate, an alkali metal salt of tetrapolyphosphate, an alkali metal salt of hexametaphosphate, an alkali metal salt of pyrophosphate, an alkali metal salt of primary phosphate, The method according to any one of claims 1 to 3 , which is at least one selected from an alkali metal salt of diphosphate, an alkali metal salt of tertiary phosphate, an alkali metal salt of acidic metaphosphoric acid, and an alkali metal salt of acidic pyrophosphoric acid. A fluidizer composition for soil cement according to any one of the preceding claims. The fluidizer composition for soil cement according to any one of claims 1 to 4 , which is used in a ground improvement method, an underground continuous wall method, a foundation pile method or a backfill method. A cementitious suspension comprising the fluidizer composition for soil cement according to any one of claims 1 to 5 , cement and water. A soil cement comprising the cement-based suspension according to claim 6 and soil.