JP6212907B2 - Grout composition, grout mortar and grout cured body - Google Patents

Description

  The present invention relates to a grout composition, a grout mortar, and a grout cured body that are used in various construction works in the civil engineering and construction fields and have a small difference in initial expansion under high and low temperature environments.

  Grout mortar obtained from a grout composition containing Portland cement as a main component has fluidity, so it is filled into the gap by pouring into gaps between structural members and cross sections of complex shapes, and integrated with the structure. It is mainly used as a filler because of its characteristics. In addition, since the grout composition is used for the purpose of integrating the structure, non-shrinkage after placing is essential. Therefore, the grout composition generally used has a countermeasure against shrinkage.

  As a measure for preventing shrinkage, Patent Document 1 discloses the use of aluminum powder as a foaming substance, and the surface of the aluminum powder is easily oxidized, and its reactivity decreases when covered with an oxide film. Or aluminum powder surface-treated with stearic acid or the like.

  In Patent Document 2, since it is necessary to suppress foaming during pumping after kneading, it is preferable to use an aluminum metal powder previously coated with one or more of fatty acids such as stearic acid or derivatives thereof. When aluminum metal powder disclosed and previously coated with a fatty acid or a derivative thereof is used, the timing of foaming start can be delayed.

  In Patent Document 3, the fineness of the metal aluminum powder is preferably 180 mesh or more, and the upper limit is not particularly limited, and is coated with a fatty acid having 12 to 20 carbon atoms such as stearic acid and oleic acid to control the reactivity. It is disclosed that what has been performed can also be used.

JP 2007-238745 A JP 2009-83413 A JP 2010-173934 A

  However, since the foaming performance of aluminum fine powder is easily affected by the difference in temperature environment during construction, even if moderate expansion is obtained at low temperatures, overexpansion at high temperatures or moderate expansion at high temperatures is obtained. However, there is still a problem of shrinkage at low temperatures. Therefore, even if it is one compound throughout the year, it has moderate expansion without shrinkage and overexpansion due to differences in temperature environment, and the difference in shrinkage at high and low temperatures is small, providing the necessary and sufficient compressive strength. A grout composition is desired.

  Therefore, the present invention can obtain a grout mortar having an appropriate fluidity for filling a gap between structures, and by curing the grout mortar, there is no contraction or overexpansion due to a difference in temperature environment. A grout composition having an appropriate expansion, having a small difference in shrinkage between a high temperature and a low temperature, having a necessary and sufficient compressive strength, and capable of forming a grout cured body excellent in integration with a structure. The purpose is to provide.

  The present inventors have found that the above problems can be solved by using a grout composition containing a specific aluminum fine powder in a specific ratio, and have reached the present invention.

That is, the present invention is a grout composition containing Portland cement, fine aggregate, inorganic expansion material, aluminum fine powder and fluidizing agent, and the aluminum fine powder has a water surface diffusion area of 0.60 to 0.94 m ^2. / G, 100 to 200 parts by mass of fine aggregate with respect to 100 parts by mass of Portland cement, 1 to 10 parts by mass of an inorganic expansion material, and 0.0014 to 0.0027 parts by mass of fine aluminum powder. Yes, it is 0.1-3 parts by mass of a fluidizing agent, and has a pulverization step of adding a fatty acid as a pulverization aid to the raw material containing aluminum foil during the production of aluminum fine powder, and oil removal in a later step A grout composition is provided that has no steps.

  The grout composition can obtain a grout mortar having appropriate fluidity for filling the gaps between structures, has no expansion or contraction due to differences in temperature environment, has appropriate expansion, and has a high temperature. It is possible to form a grout cured body having a small difference in shrinkage between time and low temperature, having a necessary and sufficient compressive strength, and excellent in integration with a structure.

  In the grout composition of the present invention, the fine aggregate is composed of particles having a particle size of 600 μm or more and less than 1180 μm in a mass proportion of 15 to 60% by mass, particles having a particle size of 300 μm or more and less than 600 μm in a mass proportion of 25 to 60% by mass, It is preferable to contain 3 to 30% by mass of particles having a diameter of 150 μm or more and less than 300 μm, respectively, and appropriate fluidity and hardened material properties for filling the gaps in the structure can be improved more reliably.

  The grout composition of the present invention further includes a shrinkage reducing agent, and is preferably 0.05 to 3 parts by weight of the shrinkage reducing agent with respect to 100 parts by weight of Portland cement. Appropriate fluidity and cured properties can be more reliably improved.

  The grout composition of the present invention further includes a material separation reducing agent, and is preferably 0.005 to 0.3 parts by mass of the material separation reducing agent with respect to 100 parts by mass of Portland cement. Therefore, it is possible to more reliably improve the proper fluidity and cured product properties for filling the resin.

  The grout composition of the present invention further contains an antifoaming agent, and is preferably 0.01 to 1 part by weight of the antifoaming agent with respect to 100 parts by weight of Portland cement, and is used to fill the gaps in the structure. Appropriate fluidity and cured properties can be more reliably improved.

  The present invention also provides a grout mortar containing the grout composition and water. This grout mortar has appropriate fluidity for filling the gaps between structures, has moderate expansion without shrinkage and overexpansion due to differences in temperature environment, and has good cured properties. Since a grout hardened body excellent in integration can be formed, it is suitably used as a grout mortar for various construction works in the civil engineering and construction fields.

  The present invention further provides a grout cured product obtained by curing the grout mortar. Since the cured grout is formed from the grout composition, it has moderate expansion without shrinkage or overexpansion due to differences in temperature environment, and the difference in shrinkage between high and low temperatures is small and good. Since it has excellent cured properties, it is excellent in integration with a structure and is suitable as a grout cured body used in various construction works in the civil engineering and construction fields.

  According to the present invention, it is possible to obtain a grout mortar having an appropriate fluidity for filling a gap between structures, and by curing the grout mortar, there is no contraction or overexpansion due to a difference in temperature environment. A grout composition having an appropriate expansion, having a small difference in shrinkage between a high temperature and a low temperature, having a necessary and sufficient compressive strength, and capable of forming a grout cured body excellent in integration with a structure. Can be provided.

It is a secondary electron image photograph of the aluminum fine powder B measured using the scanning Auger electron branching apparatus.

<Grout composition>
Hereinafter, preferred embodiments of the grout composition of the present invention will be described. The grout composition of the present embodiment has Portland cement, fine aggregate, inorganic expansion material, aluminum fine powder and fluidizing agent. The aluminum fine powder is mainly scaly in shape and has a surface diffusion. The area is 0.60 to 0.94 m ² / g, and it has a pulverization step that pulverizes by adding fatty acid as a pulverization aid to the raw material containing aluminum foil during the production of aluminum fine powder. It is a grout composition without a process.

  As Portland cement, it is preferable to use at least one selected from ordinary Portland cement, early-strength Portland cement, ultra-early strong Portland cement, moderately hot Portland cement, sulfate-resistant Portland cement, low heat Portland cement and white Portland cement. In particular, it is preferable to use a combination of ordinary Portland cement and early-strength Portland cement, which is less susceptible to the curing characteristics due to differences in temperature conditions.

  When ordinary Portland cement and early-strength Portland cement are used in combination at 100% by mass, ordinary Portland cement is preferably 20 to 60% by mass and early-strength Portland cement is preferably 40 to 80% by mass. It is more preferable that they are 50 mass% and early strong Portland cement 50-70 mass%, and it is especially preferable that they are 35-45 mass% normal Portland cement and 55-65 mass% early strong Portland cement.

  As the fine aggregate, at least one selected from sands such as quartz sand, river sand, land sand, sea sand and crushed sand can be used. In addition, it is more preferable to use a combination of fine aggregates having various particle sizes because a specific particle size can be adjusted.

  The fine aggregate is composed of particles having a particle size of 600 μm or more and less than 1180 μm, 15-60% by mass, particles having a particle size of 300 μm or more and less than 600 μm, 25-60% by mass, particles having a particle size of 150 μm or more and less than 300 μm. It is preferable to contain each at a mass ratio of 3 to 30% by mass.

Fine aggregate is
The mass ratio of particles having a particle diameter of 600 μm or more and less than 1180 μm is 20 to 55 mass%, the mass ratio of particles having a particle diameter of 300 μm or more and less than 600 μm is 30 to 55 mass%, and the mass ratio of particles having a particle diameter of 150 μm or more and less than 300 μm is 4 to 4%. It is more preferable that the mass ratio of particles having a particle diameter of 25% by mass and 75 μm or more and less than 150 μm is 1 to 9% by mass, respectively.

  The grout composition of this embodiment can improve the moderate fluidity and hardened | cured material property for filling the space | gap of a structure more reliably by including the fine aggregate which has a particle diameter in the above-mentioned range. .

  The particle diameter of the fine aggregate can be measured by using several sieves having different nominal dimensions as defined in JIS Z 8801: 2006. Further, in this specification, “the mass ratio of particles having a particle diameter of 650 μm or more and less than 1180 μm” means that when a sieve having a sieve size of 1180 μm is used, the sieve passes through a sieve having a sieve size of 1180 μm and has a sieve size of 650 μm. Is the mass ratio of the particles remaining on the sieve having a sieve mesh of 650 μm to the whole fine aggregate.

  The content of fine aggregate in the grout composition of the present embodiment is 100 to 200 parts by weight, preferably 120 to 190 parts by weight, more preferably 140 to 185 parts by weight with respect to 100 parts by weight of Portland cement. Part, particularly preferably 150 to 180 parts by weight.

  By setting the content of the fine aggregate in the above-described range, the grout composition can more reliably improve the appropriate fluidity and hardened material properties for filling the gaps between the structures.

  As the inorganic expansion material, quick lime-gypsum expansion material, gypsum expansion material, calcium sulfoaluminate expansion material and the like can be used. Of these, quick lime-gypsum-based expansion material containing quick lime as an active ingredient which has a strength enhancement effect under a low-temperature environment by a hydration exotherm during reaction as well as a shrinkage compensation effect can be suitably used. Although the quicklime content in a material is not specifically limited, Since a hydration reaction may advance rapidly in what has a quicklime content (including 100 mass%), content of 40-80 mass% is preferable.

  Content of the inorganic expansion material in the grout composition of this embodiment is 1-10 mass parts with respect to 100 mass parts of Portland cement, Preferably it is 2-8 mass parts, More preferably, it is 3-7 masses. Part, particularly preferably 4 to 6 parts by mass.

  By setting the content of the inorganic expansion material in the above range, the curing characteristics of the grout cured body can be further improved.

  As a manufacturing method of the aluminum fine powder used for the grout composition of this embodiment, it has the crushing process which adds a fatty acid to a raw material containing aluminum foil as a crushing assistant, and dry pulverizes. As the pulverizer, a vibration mill or the like can be used. And the magnitude | size of the aluminum fine powder can be classified by using a sieve. Moreover, it does not have the oil removal process which removes the fatty acid adhering to the aluminum fine powder in the subsequent process. The shape of the aluminum fine powder is scale-like as shown in FIG.

The initial shrinkage / expansion of the grout cured product obtained by curing the grout mortar containing the grout composition of the present embodiment and water mainly depends on the foamability of the aluminum fine powder. The foamability of the aluminum fine powder is considered to vary depending on various factors, but one of the factors that are easily affected is the size of the aluminum fine powder. As an index of the size, there is a water surface diffusion area. By setting this to an appropriate range, it is possible to obtain appropriate expansion without contraction or overexpansion due to differences in temperature environment. The water surface diffusion area of the aluminum fine powder contained in the grout composition of the present embodiment is 0.60 to 0.94 m ² / g, preferably 0.70 to 0.92 m ² / g, more preferably. 0.80 to 0.90 m ² / g.

  Here, the water surface diffusion area can be determined according to JIS K 5906: 1998 “Aluminum Pigment for Paint”.

  Content of the aluminum fine powder in the grout composition of this embodiment is 0.0014-0.0027 mass part with respect to 100 mass parts of Portland cement, Preferably it is 0.0015-0.0026 mass part, More preferably, it is 0.0016-0.0025 mass part, Most preferably, it is 0.0017-0.0024 mass part.

  By setting the water surface diffusion area and the content of the aluminum fine powder within the above-described ranges, it is possible to have appropriate expansion without shrinkage or overexpansion due to differences in temperature environment.

  Moreover, the fatty acid adhering to aluminum fine powder becomes like this. Preferably it is 0.3-0.9 mass% with respect to the mass of the whole aluminum fine powder, More preferably, it is 0.4-0.8 mass%.

  When the adhesion ratio of the fatty acid is in the above-described range, it is possible to ensure more appropriate expansion without contraction or overexpansion due to a difference in temperature environment.

  The qualitative and quantitative determination of fatty acids adhering to the aluminum fine powder is measured by gas chromatograph (GC) and gas chromatograph-mass spectrometry (GC / MS) of the components eluted by refluxing the aluminum fine powder with a chloroform / methanol mixture. Can do.

  As said fatty acid, a C12-C20 fatty acid can be used conveniently. Of these, stearic acid having 18 carbon atoms or an alkali salt thereof is preferable.

  Melamine sulfonic acid / formaldehyde condensate or its alkali salt, naphthalene sulfonic acid / formaldehyde condensate or its alkali salt, casein, calcium caseinate, polycarboxylic acid, polyether and polyether Commercially available fluidizing agents mainly composed of carboxylic acid or the like can be used regardless of the type, and in particular, commercially available fluidizing agents mainly composed of naphthalenesulfonic acid / formaldehyde condensate alkali salt can be suitably used. .

  The content of the fluidizing agent in the grout composition of the present embodiment is 0.1 to 3 parts by weight, preferably 0.3 to 2 parts by weight, more preferably 100 parts by weight of Portland cement. It is 0.4-1.7 mass part, Most preferably, it is 0.5-1.5 mass part.

  By setting the content of the fluidizing agent in the above-described range, it is possible to more reliably improve appropriate fluidity and cured material properties for filling the gaps between the structures.

    The grout composition of the present embodiment is combined with the above-mentioned Portland cement, fine aggregate, inorganic expansion material, aluminum fine powder, and fluidizing agent in the above-mentioned preferred ranges, so that it is suitable for filling the gaps in the structure. It is possible to obtain a grout mortar having a proper fluidity, and by curing the grout mortar, it has an appropriate expansion without shrinkage or overexpansion due to differences in temperature environment, and shrinkage at high and low temperatures. It is possible to form a grout cured body that has a small difference, a necessary and sufficient compressive strength, and excellent integration with a structure.

  The grout composition of this embodiment may contain a shrinkage reducing agent, a material separation reducing agent, an antifoaming agent, and the like as necessary in addition to the above-described essential components.

  The shrinkage reducing agent can be appropriately added within a range that does not impair the characteristics of the grout composition of the present embodiment. By using the material separation reducing agent, it is possible to further improve the reduction of long-term drying shrinkage, and to further improve the appropriate fluidity and cured material properties for filling the gaps in the structure.

  A known shrinkage reducing agent can be used as the shrinkage reducing agent. In particular, those having an alkylene oxide polymer in the skeleton of the chemical structure can be suitably used. For example, polyalkylene glycols such as polypropylene glycol and poly (propylene / ethylene) glycol and generally known ones such as alkoxy poly (propylene / ethylene) glycol having 1 to 6 carbon atoms can be appropriately selected and used.

  The content of the shrinkage reducing agent in the grout composition of the present embodiment is preferably 0.05 to 3 parts by mass, more preferably 0.1 to 2 parts by mass with respect to 100 parts by mass of Portland cement. More preferably, it is 0.3-1.5 mass part, Most preferably, it is 0.5-1.1 mass part.

  By making the content of the shrinkage reducing agent in the above-mentioned range, it is possible to further improve the reduction of long-term drying shrinkage, and more appropriate fluidity and cured properties for filling the gaps in the structure. Can be improved.

  The material separation reducing agent can be appropriately added as long as the characteristics of the grout composition of the present embodiment are not impaired. By using the material separation reducing agent, it is possible to further improve appropriate fluidity and cured material properties for filling the gaps between the structures.

  The material separation reducing agent is preferably a polymer synthetic copolymer, and the viscosity of a 2% aqueous solution at 20 ° C. is preferably 2,000 to 8,000 mPa · s, more preferably 2,500 to 6 , 500 mPa · s, more preferably 3,000 to 5,500 mPa · s, and particularly preferably 3,500 to 5,000 mPa · s.

  By setting the viscosity of the 2% aqueous solution of the material separation reducing agent at 20 ° C. within the above range, it is possible to further improve the appropriate fluidity and cured material properties for filling the gaps between the structures.

  Here, the “viscosity” of the material separation reducing agent means that a 2% aqueous solution of the material separation reducing agent is obtained by using a B-type viscometer (digital viscometer manufactured by BROOKFIELD: RVDV-1 +) with a rotor No. 4. A value measured at a rotational speed of 12 rpm and 20 ° C.

  The thixotropic index (TI value) of a 2% aqueous solution of the material separation reducing agent at 20 ° C. is preferably 2.00 to 3.60, more preferably 2.20 to 3.40, and even more preferably 2. It is 40-3.20, Most preferably, it is 2.60-3.00.

  By setting the TI value of the 2% aqueous solution of the material separation reducing agent at 20 ° C. within the above range, it is possible to further improve the appropriate fluidity and cured product properties for filling the gaps in the structure.

  Here, the “TI value” of the material separation reducing agent refers to a 2% aqueous solution of the material separation reducing agent in accordance with JIS K 5101-6-2: 2004, and a B-type viscometer (digital viscometer manufactured by BROOKFIELD) : RVDV-1 +). 4. The value measured at 20 ° C.

  The content of the material separation reducing agent in the grout composition of the present embodiment is preferably 0.005 to 0.3 parts by mass, more preferably 0.01 to 0.2 parts per 100 parts by mass of Portland cement. It is a mass part, More preferably, it is 0.02-0.15 mass part, Most preferably, it is 0.03-0.1 mass part.

  By setting the content of the material separation reducing agent in the above-described range, it is possible to further improve appropriate fluidity and cured material properties for filling the gaps between the structures.

  The antifoaming agent can be appropriately added as long as the characteristics of the grout composition of the present embodiment are not impaired. By using the material separation reducing agent, it is possible to further improve appropriate fluidity and cured material properties for filling the gaps between the structures.

  In addition, as a defoaming agent, any commercially available one can be used as long as it can be used for mortar and concrete. For example, mineral oil-based, silicone-based, alcohol-based, polyether-based synthetic substances or plant-derived natural substances can be used. Substances can be used. In particular, a polyether-based or mineral oil-based antifoaming agent can be suitably used in combination.

  The content of the antifoaming agent in the grout composition of the present embodiment is preferably 0.01 to 1 part by mass, more preferably 0.03 to 0.5 part by mass with respect to 100 parts by mass of Portland cement. More preferably, it is 0.04-0.3 mass part, Most preferably, it is 0.05-0.2 mass part.

  By setting the content of the antifoaming agent in the above-described range, it is possible to further improve the appropriate fluidity and cured product properties for filling the gaps between the structures.

<Grout mortar>
The grout mortar of the present invention contains the grout composition described above and water, and can be prepared by blending and kneading the grout composition and water. A preferred embodiment of the grout mortar of the present invention will be described below.

The grout mortar of this embodiment can be suitably used as a filler that fills the gaps between structures. When preparing the grout mortar, the J ₁₄ funnel flow-down value and the flow value of the grout mortar can be adjusted by appropriately changing the blending amount of water. Here, the J ₁₄ funnel flow-down value is a J ₁₄ funnel flow-down value (unit: second) measured immediately after kneading in accordance with the consistency test method described in JHS 312-1999 “No Shrinkage Mortar Quality Control Test Method”. ). In addition, the flow value is the simple table flow described in Section 2 Material 8.2.10 Mortar & Grout material of “Renovation Management Guidelines for Building Renovation, 2007 Edition” (Ministry of Land, Infrastructure, Transport and Tourism) It is a value (unit: mm) measured according to the test.

  The blending amount of water in the grout mortar of the present embodiment is preferably 11 to 21 parts by mass, more preferably 12 to 20 parts by mass, and further preferably 13 to 19 parts by mass with respect to 100 parts by mass of the grout composition. Part, particularly preferably 14 to 18 parts by weight.

The J ₁₄ funnel flow value of the grout mortar of this embodiment is preferably 6 to 10 seconds, more preferably 6.5 to 9.5 seconds, still more preferably 7 to 9 seconds, and particularly preferably. 7.5 to 8.5 seconds.

  The flow value of the grout mortar of the present embodiment is preferably 200 to 270 mm, more preferably 215 to 265 mm, and particularly preferably 210 to 260 mm.

By the J ₁₄ funnel flow value and flow value within the above range, it is possible to obtain the grout mortar having a suitable fluidity to fill the gap of the structure.

<Hard grout>
The grout hardening body of this invention can be obtained by hardening the above-mentioned grout mortar. A preferred embodiment of the grout cured body of the present invention will be described below.

  The grout hardened | cured material of this embodiment can be used suitably as a grout hardened | cured material used for the various construction of the civil engineering / architecture field. That is, the grout cured product of this embodiment formed by curing the grout mortar described above has an expansion / contraction rate at a low temperature in the initial stage of curing not on the contraction side (minus side) but on an appropriate expansion side (plus side). In addition, since the difference in initial expansion (expansion / shrinkage difference) under high temperature and low temperature environments is small, it is excellent in integration with a structure. In addition, it has sufficient compressive strength to be integrated with the structure.

Here, the expansion / contraction rate is a value (unit:%) measured based on the expansion / contraction test method described in JHS 312-1999 “No-Shrinkage Mortar Quality Control Test Method”. The difference in expansion / contraction rate is a value (unit:%) obtained from the difference between the expansion / contraction rate at a low temperature (5 ° C.) and the expansion / contraction rate at a high temperature (30 ° C.). Further, the compressive strength is a value (unit: N / mm ² ) measured in accordance with the compressive strength test method described in JHS 312-1999 “No Shrinkage Mortar Quality Control Test Method”.

  The expansion / contraction rate at 5 ° C. of the grout cured product of this embodiment is preferably 0 to 0.35%, more preferably 0 to 0.30%, and further preferably 0 to 0.27%. Especially preferably, it is 0 to 0.25%.

  The expansion / contraction rate difference of the grout cured product of the present embodiment is preferably 0 to 0.5%, more preferably 0 to 0.47%, still more preferably 0 to 0.46%, and in particular. Preferably it is 0 to 45%.

  When the expansion / contraction rate at 5 ° C. and the difference in expansion / contraction rate are in the above-described range, a grout cured product excellent in integration with the structure can be obtained.

Compressive strength at 20 ° C. of the grout curing body of the present embodiment, preferably the age 3 days at 25 N / mm ² or more, 35N / mm ² or more at an age of 7 days, at 45N / mm ² or more at an age of 28 days is there.

  When the compressive strength at 20 ° C. is in the above-described range, a grout cured product that is excellent by integration with a structure can be obtained.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

  Hereinafter, the contents of the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to the following examples.

(Experimental example 1)
For 100 parts by mass of Portland cement, the experiment No. 1 was conducted in the mass parts shown in Table 3 with fine aggregate, inorganic expansion material, aluminum fine powder, fluidizing agent, material separation reducing agent, shrinkage reducing agent and antifoaming agent. 1-1-No. 1 to 7 was blended to prepare a grout composition, and 100 parts by weight of the grout composition was kneaded with water in parts by weight shown in Table 3 to prepare grout mortar. Kneading temperature 5 ° C., 20 ° C., under the conditions of 30 ° C. (65% each relative humidity) were performed for 2 minutes at a rotation speed of 700rpm using a chemi-stirrer (manufactured by Shinto Scientific BLW1200), _{J 14} funnel immediately after kneading The flow down value and the flow value were measured. The results of the J ₁₄ funnel flow value and flow value are shown in Table 3. Moreover, the expansion / contraction test was done using the grout mortar prepared similarly. Table 4 shows the results (expansion / shrinkage ratio and expansion / shrinkage difference) of the expansion / shrinkage test.
[Raw materials]
The raw materials shown in (1) to (8) below were prepared.
(1) Portland cement / PC-A (Hayakyu Portland cement, manufactured by Ube Mitsubishi Cement Co., Ltd., Blaine specific surface area = 4500 cm ² / g)
PC-B (ordinary Portland cement, manufactured by Ube Mitsubishi Cement Co., Blaine specific surface area = 3300 cm ² / g)
(2) Fine aggregate, A (No. 4 silica sand, manufactured by JFE Minerals)
・ B (No. 4 quartz sand, manufactured by Ashiya Company)
・ C (No. 5 quartz sand, manufactured by Ashiya Company)
・ D (No. 6 quartz sand, manufactured by Ashiya Company)
・ E (No. 7 quartz sand, manufactured by Ashiya Company)
・ F (No. 8 quartz sand, manufactured by Ashiya Company)
-Table 1 shows the particle size distribution of the fine aggregate used in the experiment.

(3) Inorganic expansive material / quick lime-gypsum expansive material (Pacific Material, quick lime = 50 mass%)
(4) Aluminum fine powder Table 2 shows the aluminum fine powder used in the experiment.

  The above-mentioned aluminum fine powders A to D were produced by adding stearic acid as a grinding aid to a raw material containing aluminum foil in a grinding process, dry grinding with a vibration mill, and classification with a sieve. Aluminum fine powders having different water surface diffusion areas were obtained depending on the size of the sieve mesh. Among them, A and C were produced through an oil removing process for removing stearic acid adhering to the aluminum fine powder during the pulverization process. The shape of the aluminum fine powder obtained by the pulverization step was scaly. As a representative example, FIG. 1 shows a secondary electron image photograph of aluminum fine powder B measured using a scanning Auger electron branching device (PHI SAM-670Xi type).

  The stearic acid adhering to the aluminum fine powder due to the difference between the presence and absence of the oil removal step is not detected in the aluminum fine powder A and 0.6 mass in the aluminum fine powder B with respect to the total mass of the aluminum fine powder. %Met.

  The proportion of stearic acid adhering to the aluminum fine powder is determined by the chromatograph (GC) and the chromatograph-mass spectrometry (GC-MS) of the aluminum fine powders A and B, which were refluxed with a chloroform / methanol mixture and eluted. Obtained by qualitative and quantitative analysis. As for gas chromatograph, apparatus: Agilent Technologies 6890 type, column: HP-5MS (30 m × 0.25 mm ID, film thickness 0.25 μm), detector: flame ionization detector (FID), gas chromatograph-mass spectrometry The device was a JSM GC-mate II type manufactured by JEOL, and the ionization method was an electron ionization (EI) method (the GC portion is equivalent to the above-mentioned GC).

(5) Fluidizing agent / Naphthalene sulfonic acid / Formaldehyde condensate sodium fluidizing agent (manufactured by Kao)
(6) Material separation reducing agent / polymer synthetic copolymer (manufactured by BASF, trade name: Melvis F40, viscosity [20 ° C., 2% aqueous solution]: 4283 mPa · s, TI value [20 ° C., 2% aqueous solution]: 2. 76)
(7) Shrinkage reducing agent / shrinkage reducing agent having an alkylene oxide polymer as a skeleton (manufactured by Takemoto Yushi Co., Ltd.)
(8) Antifoaming agent A (polyether-based antifoaming agent [including polyoxyalkylene ether and special nonionic surfactant), manufactured by ADEKA)
・ B (mineral oil-based antifoaming agent (including mineral oil and special nonionic surfactant), manufactured by ADEKA)

[Method for evaluating properties of grout mortar and grout cured product]
₍₁₎ was measured _{J 14} funnel flow value at conform to consistency testing method according the temperature measuring method JHS 312-1999 of _{J 14} funnel flow value "non-shrink mortar quality control test method".
(2) Flow value measurement method Simple table as described in Section 2 Material 8.2.10. The flow value was measured at each temperature according to the flow test. The flow value was measured when 5 minutes had passed after the grout mortar immediately after kneading was filled into the flow cone and the flow cone was immediately pulled up.
(3) Measuring method of shrinkage expansion coefficient and contraction expansion coefficient difference The shrinkage expansion coefficient was measured in accordance with the expansion / shrinkage test method described in JHS 312-1999 “Test method for non-shrink mortar quality control”. Further, the difference between the expansion and contraction rate was obtained from the difference between the expansion and contraction rate at low temperature (5 ° C.) and the expansion and contraction rate at high temperature (30 ° C.).

No. containing no aluminum fine powder. 1-1, No. 1 containing aluminum fine powder B under the condition of 5 ° C. 1-3 and showed almost the same fluidity _{(J 14} funnel flow value and flow value). No. containing aluminum fine powder A having an oil removing step. 1-2 is No. 1 containing aluminum fine powder B that does not have an oil removal step under the condition of 20 ° C. The fluidity was almost equivalent to 1-3. From this, it was inferred that the blending amount of the aluminum fine powder with respect to the entire grout composition was small, and the flowability was not greatly affected. In addition, the fine aggregate has a different particle size. 1-3 and No.1. When comparing 1-7, there was no big difference in fluidity under each temperature condition.

  No. containing no aluminum fine powder. 1-1 contracted with an expansion / contraction rate of −0.46% under the condition of 5 ° C. No. containing aluminum fine powder A having an oil removing step. 1-2 contracted with an expansion / contraction rate of -0.28% under the condition of 5 ° C. No. containing fine aluminum powder B without oil removal step 1-3 expanded moderately with an expansion / contraction rate of 0.10% under the condition of 5 ° C., and the difference in expansion / contraction rate was as good as 0.26%. No. 1-2 or No. No. 1 containing aluminum fine powder C having a water surface diffusion area larger than 1-3 and having an oil removal step. 1-4 contracted with an expansion / contraction rate of -0.27% under the condition of 5 ° C. No. 1-2 or No. No. 1 containing aluminum fine powder D having a water surface diffusion area larger than 1-3 and having no oil removal step. 1-5 expanded moderately with an expansion / contraction rate of 0.12% under the condition of 5 ° C., but the difference in expansion / contraction rate was 0.55%, exceeding the preferred range. No. 1 containing 0.0017 parts by mass of aluminum fine powder A and 0.0004 parts by mass of aluminum fine powder B. 1-6 contracted with an expansion / contraction rate of -0.24% under the condition of 5 ° C. No. No. 1 containing the same aluminum fine powder B as 1-3 and having a different aggregate particle size. 1-7 expanded moderately with an expansion / contraction rate of 0.17% under the condition of 5 ° C., and the difference in expansion / contraction rate was as good as 0.41%.

(Experimental example 2)
Experiment No. 1-3 and no. A grout composition was prepared in the same manner as in Experimental Example 1, except that 1-7 was used as the base formulation and the compounding amount of the aluminum fine powder B was changed. As shown in Table 5, Experiment No. 2-1 to 2-3 are experiment Nos. 1-3, based on Experiment No. 2-4, Experiment No. The compounding quantity of the aluminum fine powder B was changed on the basis of 1-7. And grout mortar was prepared by kneading water with 100 parts by mass of the grout composition at parts by mass shown in Table 5. The kneading is performed at a temperature of 5 ° C. and 30 ° C. (each relative humidity 65%) using a chemistor (Shinto Kagaku BLW1200) at a rotation speed of 700 rpm for 2 minutes, and expanded using a grout mortar immediately after kneading. A shrinkage test was performed. Table 6 shows the results of the expansion / contraction test (expansion / contraction rate and expansion / contraction rate difference).

  No. containing 0.0019 parts by mass of aluminum fine powder B The expansion and contraction rate of 2-1 was moderately expanded at 0.08% under a temperature condition of 5 ° C., and the difference between the expansion and contraction rate was as good as 0.09%. No. containing 0.0022 parts by mass of aluminum fine powder B The expansion and contraction rate of 2-2 was moderately expanded at 0.15% under a temperature condition of 5 ° C., and the difference between the expansion and contraction rate was as good as 0.36%. No. containing 0.0028 parts by mass of aluminum fine powder B In 2-3, the difference in expansion / shrinkage ratio was as good as 0.32%, but the expansion / shrinkage ratio exceeded the preferable range of 0.40% under the temperature condition of 5 ° C. No. No. 2-2 and fine aggregates differ in particle size. 2-4 expanded moderately with an expansion / shrinkage ratio of 0.21% under a temperature condition of 5 ° C., and the difference in expansion / shrinkage ratio was as good as 0.41%.

(Experimental example 3)
Experiment No. described in Table 3 1-3 and Experiment No. Grout mortar was prepared by kneading water at 15.5 parts by mass and 16 parts by mass with respect to 100 parts by mass of 1-7 grout composition. The kneading was performed at a temperature of 20 ° C. and a relative humidity of 65% for 2 minutes using a chemistor (Shinto Kagaku BLW1200) at a rotation speed of 700 rpm, and a compressive strength test was performed using a grout mortar immediately after kneading. . The results of the compressive strength test are shown in Table 7.

[Method for evaluating properties of cured grout]
(1) Measuring method of compressive strength Based on the compressive strength test method described in JHS 312-1999 "Test method for non-shrinking mortar quality control", compressive strength test was measured at the age of 3 days, 7 days and 28 days. .

  No. 3-1. The compressive strength necessary and sufficient for integrating with the structure was obtained for each material age in 3-2.

  From the above, the grout composition of the present invention containing a specific aluminum fine powder in a specific ratio can obtain a grout mortar having appropriate fluidity for filling the gaps in the structure. By curing mortar, it has moderate expansion without shrinkage or overexpansion due to differences in temperature environment, small difference in shrinkage between high temperature and low temperature, and necessary and sufficient compressive strength. It is possible to form a grout cured body that is excellent in integration with the.

Claims (7)

A grout composition comprising Portland cement, fine aggregate, inorganic expansion material, aluminum fine powder and fluidizing agent,
The aluminum fine powder has a water surface diffusion area of 0.60 to 0.94 m ² / g,
The fatty acid adhering to the aluminum fine powder is 0.3 to 0.9 mass% with respect to the mass of the entire aluminum fine powder,
The fatty acid is stearic acid or an alkali salt thereof;
The fine aggregate is 100 to 200 parts by mass, the inorganic expansive material is 1 to 10 parts by mass, and the aluminum fine powder is 0.0014 to 0.0027 parts by mass with respect to 100 parts by mass of the Portland cement. , 0.1-3 parts by mass of the fluidizing agent,
During the production of the aluminum fine powder, it has a pulverization step of adding a fatty acid as a pulverization aid to the raw material containing aluminum foil, and does not have an oil removal step in a later step.
Grout composition.   The fine aggregate is composed of particles having a particle size of 600 μm or more and less than 1180 μm, 15-60% by mass, particles having a particle size of 300 μm or more and less than 600 μm, 25-60% by mass, particles having a particle size of 150 μm or more and less than 300 μm. The grout composition according to claim 1, wherein the mass ratio is 3-30% by mass. The grout composition further includes a shrinkage reducing agent, and the shrinkage reducing agent is 0.05 to 3 parts by mass with respect to 100 parts by mass of the Portland cement.
The grout composition according to claim 1 or claim 2. The grout composition further includes a material separation reducing agent, and the material separation reducing agent is 0.005 to 0.3 parts by mass with respect to 100 parts by mass of the Portland cement.
The grout composition according to any one of claims 1 to 3. The material separation reducing agent has a 2% aqueous solution viscosity of 2,000 to 8,000 mPa · s at 20 ° C., and a TI value of the 2% aqueous solution at 20 ° C. of 2.00 to 3.60.
The grout composition according to claim 4 . The grout composition according to any one of claims 1 to 5 and water.
Grout mortar. Obtained by curing the grout mortar according to claim 6.
Grout hardened body.

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