JP3511287B2 - Soil hardener composition and method for producing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulically hardened product containing light-fired magnesia as a main component, which is a substitute for Portland cement, for constructing a molded product using a soil structure having a small environmental load.

[0002]

2. Description of the Related Art Portland cement is widely used as a highly durable structure when gravel, sand, and reinforcing bars are compounded into concrete, but it is p
It is said that H is close to 14 and it is not good for the environment because it is difficult for organisms to attach to and propagate in underwater structures. Even on land structures, unless neutralization progresses, there is a drawback that moss and grass do not adhere to them, which obstructs the landscape.In order to improve the landscape, there are holes and pockets in the structure for breeding plants and organisms. Attempts have been made to improve the landscape by installing the.

In addition, in order to improve the scenery as much as possible, a method of improving the appearance by a method of making the surface of concrete a stone tone or a method of making a fake wood is used. However, these methods have limitations in improving the biological environment, and various methods of using materials other than cement have been tried in order to adapt concrete to the natural environment.

For example, a method of adding a synthetic resin emulsion to concrete to reduce the elution of alkali, or a method of coating the surface of the concrete with a thermosetting resin to modify the surface of the concrete have been used. In this method, a method of adhering gravel or sand to the concrete surface to improve the landscape without directly contacting the concrete surface is often used.

[0005] However, it is preferable that a material, which is essentially a cement, in which organisms can easily propagate is manufactured at low cost, and a material having self-hardening properties similar to Portland cement is required.

Products marketed as soil conditioners or soil conditioners include lime type and high sulfate cement, blast furnace slag / gypsum / lime type and silica sol, sodium silicate / hardening agent type, gypsum type, etc. As soil cement, a method of adding 5 to 10% of Portland cement to soil is also used. However, in the present situation, there is almost no inexpensive soil hardening agent other than gypsum, considering the high pH and weak water resistance of gypsum.

[0007]

Therefore, the problem to be solved by the present invention is that the pH of the molded product is close to neutral and has self-hardening property and hydraulic property similar to Portland cement, and the setting time is 30 minutes or more. Slurry viscosity is 20 or more, and it has the condition that aggregate gravel and sand can be used and reinforcing bar and various fibers can be used. Compressive strength is preferably 28 days strength of 50 N / mm ² or more. It is an object of the present invention to provide a soil hardening agent composition that can be expected to be a product having a strength that is ⅕ or more of the compressive strength and exceeds Portland cement.

[0008]

In order to solve the problems in view of the above physical properties, the inventors of the present invention have conducted intensive studies and found that light burned magnesia has hydraulic properties to satisfy physical properties close to those of Portland cement. Is a method of improving the strength by adding various reaction agents to light-burning magnesia, and improving the defects of magnesium phosphate cement and oxychloride cement by the method of improving the expansivity and water resistance which are the drawbacks of light-burning magnesia. ,
The present invention has been completed by realizing the economical efficiency comparable to the price of Portland cement by the method of reducing the cost.

That is, the present invention is a soil hardening agent composition, a method for manufacturing a soil hardened product, and a method for manufacturing a molded product, which are shown in the following (1) to (4) . (1) 100 parts by weight of lightly baked magnesium, gypsum and port
One or more selected from land cement and blast furnace slag 1
~ 100 parts by weight of water as a sustained-release phosphoric acid component
5 to 100 parts by weight of phosphate fertilizer or activated sludge incineration ash, or
5 to 30 parts by weight of adsorbed and calcined metaphosphoric acid, and a setting retarder
Oxycarboxylate or ketocarboxylate 0.1 to
A soil hardening agent composition containing 1.0 part by weight. (2) 100 parts by weight of lightly burned magnesia, plus organic carbonate
The above (1) description containing 5 to 30 parts by weight of a compound as a reactant
Soil hardening agent composition. (3) Soil the soil hardening agent composition according to the above (1) or (2)
A method for producing a hardened soil that is added to. (4) Use the soil hardener composition according to (1) or (2 ) above
Composite structure for civil engineering and construction or related reinforcement
A method for manufacturing a molded product, which comprises manufacturing a molded product.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The hydraulic properties of light-burning magnesia have not been known so far, and the expansiveness is high at the stage of hydration to magnesium hydroxide, and the expansiveness that destroys the hardened product is sufficient for the concrete. It was used as a swelling agent of CSA in the same manner as CSA, but had a drawback that it swelled after the expansion rate was slow and concrete strength was generated to some extent.

However, there is no problem if the concrete develops strength after the hydration rate of the light-burning magnesia is increased and the water is completely hydrated. To this end, the particle size of the light-burning magnesia is adjusted so as to facilitate hydration. It was confirmed that hydration without leaving good unhydration can be achieved by reducing the value and adding a setting retarder.

Light-burning magnesia gives fine colloidal amorphous magnesium hydroxide when it reacts with water to form magnesium hydroxide, and this is the cause of the self-hardening properties of light-burning magnesia. As is clear from the analysis, as a method for improving water resistance, 100 parts by weight of light-burning magnesia, 5 to 10 parts by weight of Portland cement, and 10 blast furnace slags are used.
Good water resistance can be imparted by adding a mixture of ˜50 parts by weight and / or 0.1-5 parts by weight of gypsum.

A preferred example of the composition for hardening the soil is a mixture of 5 to 10 parts by weight of Portland cement to 100 parts by weight of light-burning magnesia, or 10 to 50 parts by weight of blast furnace slag to 100 parts by weight of light-burning magnesia. And / or a mixture of 0.1 to 5 parts by weight of gypsum is used in dry soil (dried at 80 ° C. for convenience of setting conditions suitable for determination of blending ratio in experiments, but dry soil is not always necessary. The same applies hereinafter) 100 to 2,000 parts by weight, water 30 to
80 parts by weight and 0.1 to 1 part by weight of a set retarder are mixed,
Fill the slurry and no formwork.

At this time, a large amount of air may be included to reduce the specific gravity, but if the air amount is reduced by vacuum defoaming, a molded product with a specific gravity of 1.2 is not defoamed but a vacuum defoamed molded product. The specific gravity is about 2.2, and the strength can be increased.

In order to obtain a high-strength product, a water reducing agent is used to reduce the amount of mixed water to about 35%, and press molding or extrusion molding of about 30 kg / cm ² is performed to obtain 100
A molded product having a compressive strength close to N / mm ² is obtained.

Further, in order to increase water resistance, a method of using water-soluble phosphate fertilizer powder or activated sludge incineration ash of sewer as a phosphoric acid source without using expensive phosphate, or porous as a sustained-release phosphoric acid High quality non-phosphoric acid-reactive silicic acids and phosphoric acid adsorbed on carbon are calcined at 440 ° C. or higher to obtain metaphosphoric acid. The phosphoric acid contained in these is present as metaphosphoric acid and is eluted into water at a slow rate, and therefore the setting time can be maintained for a long time, so that the pot life which is not available in conventional phosphate magnesia cement can be maintained.

The characteristic of this hardening agent is that it is well set at a high water ratio and is suitable for the solidification of highly water-containing soil or sludge. Raw materials of the present invention as soil components, zeolite, diatomaceous earth, bentonite, kaolin, volcanic ash, shirasu, Kanuma soil, other artificially obtained quarry powder, slag,
Incinerated ash and various dusts can be used as raw materials. Furthermore, the property of hardening regardless of the type of soil such as Kanto loam and Masato, silt, peat, and black wood and organic soil has a coagulability that Portland cement does not have.

Of course, in the present invention, in addition to aggregates such as gravel, sand and crushed stone, all aggregates used for concrete such as glass pieces and artificial aggregates can be used.

Generally, high-sulfate cement or blast-furnace slag / gypsum / lime-based soil hardening agents are commercially available.
There is a low coagulation capacity for high organic soil, and some soils such as peat and blackwood do not coagulate.

The lime soil conditioner is a product that uses the pozzolanic reaction to solidify the soil over a long period of time and has poor self-hardening property, and is a product that utilizes the hydration and dehydration action and swelling property of quicklime. It is different from the way Portland cement is used.

The light-burning magnesia used in the present invention is seawater magnesia or light-burning magnesia obtained by firing natural magnesium carbonate, and the latter is inexpensive, and this quality can maintain sufficient quality for the use of the present invention.

This lightly fired magnesia has a firing temperature of 700-
It is a product baked at 900 ° C and crushed to 70 to 120 mesh, and there is no problem in use even if it contains about 5% iron oxide, but a high iron content tends to accelerate the setting time. By using this principle, by adding 1 to 5% of ferric chloride or ferrous sulfate solution as an iron salt, the setting time can be shortened.

As a method for further delaying the setting time, citrate of oxycarboxylate or anhydrous citric acid and sodium carbonate or gluconate of tartrate or ketocarboxylate, diketoglutarate and the like are effective.
Addition of 1 to 1% can prevent unhydration.

The water-soluble phosphate fertilizer powder used as a reaction agent for light-burning magnesia is lime superphosphate, lime bisuperphosphate and citric acid.
Soluble phosphate fertilizer, lime metaphosphate, etc., the main components are acidic calcium phosphate, dicalcium phosphate, tricalcium phosphate, calcium / magnesium phosphate, etc., but the method of adding citric acid to improve water solubility, When urea is added to form a urea adduct, the solubility of phosphoric acid increases.

The above-mentioned phosphate is 18 as P ₂ O _5.
% To 19% of water-soluble phosphoric acid, and P ₂ O ₅ in the activated sludge incineration ash has a phosphoric acid content of 15% to 25%. Therefore, light-burning magnesia is added to these to react. The reaction equivalent is dicalcium phosphate-2 magnesium or tricalcium phosphate-magnesium or calcium phosphate-
A 4-atom calcium / magnesium salt such as 3 magnesium would theoretically give a water-insoluble reaction hardened product, but the soil is good even under conditions of light burning magnesia that does not always satisfy this reaction equivalent. Water-soluble phosphate fertilizer powder 5 to 100 parts by weight of hardened and lightly baked magnesia
100 to 200 parts by weight of dry soil in the range of 100 parts by weight
0 parts by weight can be cured in a water ratio range of 30% to 80%.

Furthermore, in the method of controlling the sustained release of metaphosphoric acid, which is used in magnesium phosphate cement,
A method in which phosphoric acid is adsorbed on a porous inorganic substance and heated to form metaphosphoric acid can be used. The inorganic adsorbent is preferably silicic acid or carbon, and is inexpensive diatomaceous earth, white carbon, activated carbon, charcoal or the like. These are 85% phosphoric acid up to 60%
Can be adsorbed to powder and metaphosphoric acid shows a rapid reaction setting, whereas a long setting time can be obtained, workability is improved, and it is difficult to form a baby and the generation of strength is improved. .

Of course, when high strength is expected, water-soluble phosphate fertilizer powder 20 to 5 is added to 100 parts by weight of light-burning magnesia.
0 parts by weight, 100 to 150 parts by weight of soil, setting retarder 0.
2 parts by weight is a preferable range, and the above curing agent component is adjusted and used depending on the application.

In the present invention, as a method for further improving the self-hardening property of the light-burning magnesia, organic carbonate compounds such as ethylene carbonate, triacetin, glyoxal, γ-butyl lactone, formic acid amide and ethylene glycol diacetate are mixed with the light-burning magnesia. Can be used.

Since these reactive organic carbonate compounds react with the light-burning magnesia by water to form the corresponding magnesium carbonate salt and harden, the final reaction product becomes magnesium carbonate and is insoluble in water.

The above-mentioned light-burning magnesia carbonation hardeners have good workability because they have a long setting time and gradually react to carbonate, unlike the inorganic carbonating agents such as baking soda and sodium carbonate. In order to suppress the hydration of roasted magnesia, a small amount of the citrate of oxycarboxylic acid salt or anhydrous citric acid and sodium carbonate or gluconate of tartrate or ketocarboxylate and 2 ketoglutarate is added. This can delay the reaction.

When an iron compound such as iron oxide, iron hydroxide, iron chloride, iron sulfate or the like and a similar manganese compound are added as a setting accelerator, the setting time can be accelerated and rapid hardening of about 3 minutes can be imparted.

In the formulation example of the present invention, lightly baked magnesia 10
5 parts by weight to 30 parts by weight of organic carbonate, 100 to 150 parts by weight of dry soil, 0.2 parts by weight of set retarder, and 35% to 80% of water are preferable. When high strength is desired, light burned magnesia It is preferable to bring the mixture of the carbonation hardening agent and the carbonation hardening agent close to the same amount as the dry soil.

The above-mentioned soil-hardening agents containing light-burning magnesia as a main component, if they have a large amount of water, naturally cause large shrinkage and cause cracking. For this reason, water is added as much as possible by adding a high-performance water reducing agent. It is necessary to reduce the ratio.

The high-performance water-reducing agent used in the present invention is preferably a melamine sulfonic acid type or a polycarboxylic acid type, which is effective when used in combination with the setting retarder.

The light-burning magnesia soil hardening agent is effective in reducing shrinkage when silica sand or river sand is added in an amount of 10% or more for the purpose of reducing shrinkage. If necessary, gravel can be mixed to make a concrete-like composition.

The molded article obtained in the present invention generally has a pH of 11.5 or less, which is lower than the pH of magnesium hydroxide, which is 12.5, because the acidity of the soil acts to neutralize the light-burned magnesia, depending on the type of soil. become. For this reason, the reinforcing bars are easily corroded, and the surface of the reinforcing bars is coated with resin. Further, since glass fiber has a low pH, it is durable even with an alkaline glass and does not have the solubility like cement.

Other composite reinforcing materials, such as pulp, waste paper, synthetic fibers, carbon fibers, whiskers, and plastic nets, can be mixed to improve the bending strength and have a higher viscosity than Portland cement. For,
Excellent adhesion, good reinforcement, and viscoelasticity facilitate extrusion.

Since the pH of the organisms is low, especially in a system using phosphoric acid as a curing agent, lichens can be propagated in about 3 months, and if the humidity is appropriate, the fixability is good.

The light-burning magnesia soil hardening agent molding obtained in the present invention has the same strength as a normal concrete product when it is optimally mixed and is easy to handle because of its low specific gravity, but the soil is the main raw material. Therefore, a molded product having a higher water absorption than concrete and a large amount of air has a drawback that the resistance to freezing and thawing is weak.

However, the one obtained by adding about 5% of the synthetic resin emulsion and densely molding the same has a water absorption rate of about 5% which is similar to that of concrete, and the one containing the epoxy resin emulsion has a water absorption rate of about 1%. It is possible to set the water absorption to some extent.

The soil hardening agent molding of the present invention can be produced by press molding or extrusion molding to produce a high strength molding with a small amount of air. The characteristic of this molded product is that it has a smooth surface, which is not present in concrete products and has a small reduction in white sinter. Therefore, it is suitable as an interior material for construction, has a good moisture absorption / exhaust property, has a heat insulating property as compared with concrete, and can maintain a living environment in which the properties of soil walls have been favorable since ancient times.

When the starting material is soil, the molded product of the present invention is excellent in extrusion molding because it is excellent in viscoelasticity as described above, and it is also excellent in shape retention and clay properties are well exhibited, and molding by tamping or tapping is performed. By mixing low-moisture content soil and powder, it is possible to make various molded products by on-site construction by applying spreading pressure.

The products which can be produced according to the invention extend to all the products marketed as concrete products and can make products such as gypsum products, bricks and pottery. For example, water and sewage canal products, piles, sheet piles, housing foundations, PC boards, road products, tetrapots, various boards, gardening supplies, bricks, clay pipes, road paving materials, earth retaining materials, ridge boards,
Examples include backfill grout, soil conditioners, underdrain items, and landscape materials.

It is said that many concrete products are used for drainage canals around water, river revetments, and coastal revetments, which destroys the living environment of living organisms. It is suitable for concrete and has a low risk of alkali pollution such as concrete. Therefore, a soil hardening agent such as a light-burning magnesia / phosphate system acts as a nutrient source for microorganisms and can be reduced to soil as a fertilizer component even when it becomes unnecessary.

[0045]

EXAMPLES Next, the present invention will be described more concretely with reference to production examples of compositions, applied examples and applied comparative examples. In the following, all parts and% are parts by weight or% by weight.

[Embodiment 1] Chinese light-burning magnesia (80
~ 120 mesh) 5 parts natural type 2 anhydrous gypsum in 100 parts,
Add 0.1 parts of sodium citrate, mix with 100 parts of dry Kanto loam, add 60 parts of water and knead,
Add 0.5 parts of MITEY 1000 to the mixture, knead further, and fill in a press mold of 40 × 80 × 160.
A pressure of 30 kg / cm ² is applied for pressure molding. This molded product, when cured in air for 28 days, has a bending strength of 13.6.
It exhibited N / mm ² , a compression strength of 108 N / mm ² , and a specific gravity of 2.2.

[Embodiment 2] Chinese light-burning magnesia (80
~ 120 mesh) 100 parts blast furnace slag (Daiichi Cement Neocerament 300 mesh or less) 50 parts, α
5 parts of gypsum, 0.01 part of pafthad, sodium citrate 0.
1 part was mixed well, 150 parts of dried Kanto loam was mixed with this, 60 parts of water was added and kneaded, and then 1000 parts of MYTAY 1000 and 0.5 part were added and further kneaded, 40 × 8
Filling a 0x160 press form, 35 kg / cm ²
Apply pressure to mold under pressure. This molding is 2 in the air
After curing for 8 days, the bending strength was 12.1 N / mm ² , the compressive strength was 91 N / mm ² , and the specific gravity was 2.3. The pH of the water-curing water after 28 days was 9.3.

[Example 3] Light burned magnesia from China (80
~ 120 mesh) 5 parts natural type 2 anhydrous gypsum in 100 parts,
Add 0.1 parts of sodium citrate, mix with 160 parts of peat (water content 60%), add 20 parts of water and knead. Further knead and fill in a 40 × 40 × 160 mold,
When this molded product was aged in air for 28 days, the bending strength was 0.11 N / mm ² , the compressive strength was 12 N / mm ² , and the specific gravity was 1.
No. 4 was observed, and when water was cured for 28 days, 7.4% of water was absorbed, but no dimensional change occurred.

[Example 4] Light burned magnesia (80
~ 120 mesh) 30 parts of 100 parts of supercalcium phosphate,
5 parts of natural type 2 anhydrous gypsum and 0.1 part of sodium citrate were added and mixed with 160 parts of peat (water content 60%),
Add 20 parts of water and knead.
Add 0, 0.5 parts and further knead, 50φ x 100
Fill in the mold and cure at 20 ° C for 26 minutes,
When the molded product was cured for 45 days in the air for 28 days, it showed a compressive strength of 25.7 N / mm ² and a specific gravity of 1.52. When it was cured in water for 28 days, it absorbed 6.4% of water and was deformed and deformed. No dimensional change occurred, and the pH of this underwater curing water was 8.7.

[Embodiment 5] Light burned magnesia (80
〜120 mesh) 20 parts sewer activated sludge incineration ash (16% as P ₂ O ₅ ) 100 parts, natural type 2 anhydrous gypsum 5
Part, 0.1 part of sodium citrate were added, and this was mixed with 2,000 parts of Kanto loam (water content 36%), and 32 parts of water was added and kneaded.
Add 5 parts, further knead, fill in a mold of 50φ × 100, and cure. Initial start at 20 ° C. is 38 minutes, end 79
When this molded product was cured for 28 days in air, it showed a compressive strength of 0.32 N / mm ² and a specific gravity of 1.32. When it was cured in water for 28 days, it absorbed 7.4% of water, causing deformation and dimensional change. Was not generated, and the pH of this underwater curing water was 8.5.

[Embodiment 6] Light burned magnesia (80
~ 120 mesh) 100 parts lime superphosphate (P ₂O_FiveWhen
Then 16.3%) 30 parts, natural type 2 anhydrous gypsum 5 parts, queer
Sodium acid 0.1 part was added, and this was added to Kanto Loam 3,0.
00 parts (water content 36%) are mixed with powder and spread. This
The cured product was cut out after 7 days and the compressive strength was measured.
25 N / mm², Shows a specific gravity of 1.13 and is immersed in water for 28 days.
When raw, it absorbs 9.3% of water but has good water resistance
And dimensional change did not occur, and the pH of this underwater curing water was 8.4.
there were.

It is filled in a mold of 50φ × 100 and cured, and the starting temperature at 20 ° C. is 38 minutes and the final time is 79 minutes. When this molded article is aged in air for 28 days, the compressive strength is 0.32N.
/ Mm ² , specific gravity of 1.32, and when it was aged in water for 28 days, it absorbed 7.4% of water, no deformation and dimensional change occurred, and the pH of this aged water was 8.5.

[Embodiment 7] Chinese light-burning magnesia (80
~ 120 mesh) 30 parts of 100 parts of supercalcium phosphate,
5 parts of natural type 2 anhydrous gypsum and 0.1 part of sodium citrate are added and mixed with 600 parts of Kanto loam (water content 60%), 20% of water is added and kneaded, and water is reduced to this. Isoban 10% caustic soda 10% solution 5 parts (Kuraray's isobutylene / maleic acid resin) as a foaming agent, and 0.5 part of octyl sulfonic acid sodium soda as a foaming agent are further added and kneaded.
Fill in a 0φ x 200 mold and cure at 20 ° C for 38 minutes and finish 69 minutes.
Compressed strength of 1.25 N / mm ² and specific gravity of 1.02 after curing for 10 days, 10.4% after curing in water for 28 days
Water was absorbed, and neither deformation nor dimensional change occurred. The pH of this underwater curing water was 8.7 and the porosity was 16%.

[Embodiment 8] Light burned magnesia (80
˜120 mesh) and 100 parts of zeolite with 300 parts of zeolite (100 mesh or less manufactured by Sieglite Co., Ltd.)
Thoroughly mix 25 parts of butyl lactone and 0.3 part of magnesium α-ketoglutarate, add 180 parts of water to this, knead, fill in a mold of 50φ × 100, and cure at 20 ° C. for 36 minutes. When the molded product was cured in air for 28 days at the end of 55 minutes, the compressive strength was 45.4 N / mm.
² , showed a specific gravity of 1.46, absorbed 5.8% of water when cured in water for 28 days, did not cause deformation and dimensional change, and had a pH of 8.9 in this cured water.

[Embodiment 9] Light burned magnesia (80
~ 120 mesh) 100 parts, ethylene carbonate 20 parts,
1,000 parts of dry Masato and 1.0 part of sodium gluconate were powder-mixed, 600 parts of water was added to this, and then 0.1 part of sodium citrate was added to the mixture.
0.5 part was added and further kneaded, filled in a mold of 50φ × 100, and cured to start at 20 ° C. for 38 minutes and finish for 63 minutes. When this molded product was cured in air for 28 days,
Compressive strength 0.32N / mm ² , specific gravity 1.23, 2
When it was cured in water for 8 days, it absorbed 6.6% of water, no deformation and dimensional change occurred, and the pH of this cured water in water was 8.9.

Comparative Example 1 To 1,000 parts of dried Kanto loam, 40 parts of quick lime powder (particle size of quick lime powder manufactured by Yoshizawa lime industry 30 to 2.3 mm, 3 parts of sodium silicofluoride was added to 100 parts and mixed well. Then, 800 parts of water is added to the surface-coated product), and the mixture is kneaded, filled in a 100φ × 200 mold and crushed at a pressure of 3 kg / cm ² .

The cured product after 7 days was aged in air for 28 days to obtain a compressive strength of 0.47 N / mm ² and a specific gravity of 1.30.
Then, after 28 days of underwater curing, it collapsed. The pH of this underwater curing water was 14.0 and the porosity was 3.6%.

Comparative Example 2 1,000 parts of dried Kanto loam, 150 parts of blast furnace cement (made by Taiheiyo Cement) and 6 parts of water
70 parts was added and kneaded, filled in a mold of 100φ × 200, and crushed at a pressure of 4 kg / cm ² . The cured product after 7 days was aged in air for 28 days, had a compressive strength of 0.17 N / mm ² and a specific gravity of 1.20, and was then aged for 28 days in water. The pH of this underwater curing water was 13.6 and the porosity was 4.1%.

[Comparative Example 3] To 1,000 parts of dry peat, 800 parts of water was added to 150 parts of Asano Clean Set (made by Taiheiyo Cement), and kneaded. Crush with a pressure of cm ² . Curing was not completed after 7 days, and after 28 days, the mold was removed and cured for 7 days. The compact had a compressive strength of 0.08 N / mm ² , a specific gravity of 1.15, and was then cured in water for 28 days, whereby the molded product collapsed. The pH of this underwater curing water was 13.3 and the porosity was 4.3%.

[Embodiment 10] Light firing from China of [Embodiment 7]
Overload on 100 parts of magnesia (80-120 mesh)
30 parts of calcium sulphate, 5 parts of natural type 2 anhydrous gypsum, sodium citrate
0.1 part of Da is added, and 600 parts of Kanto loam (containing water)
36%), add 10 parts of water and knead,
As a water reducing agent, isoban 10 caustic soda 10% solution
Add 5 parts (Kuraray's isobutylene / maleic acid resin)
And knead the mixture further into a vacuum clay kneading extruder.
Extruded in the shape of × 90, the compression strength is 2.55N
/ Mm ², Shows a specific gravity of 1.34 and looks like bricks
Shows that the green moss has settled in 73 days at 25 ° C and 80% humidity.
It was

[Embodiment 11] 100 parts of the light burned magnesia (80 to 120 mesh) produced in China of [Example 1] and natural 2
5 parts of anhydrous gypsum mold and 0.1 part of sodium citrate were added, mixed with 100 parts of dried Kanto loam, and added with 60 parts of water and kneaded. In addition, further kneading, 5mmφ with Chiyoda Giken granulator
The strength of the molded product molded into No. 3 showed a pressure resistance of 0.34 N / mm ^2. This molded product is suitable for the underdrain water permeation agent.

[Embodiment 12] In the formulation of [Embodiment 8], light burned magnesia (80 to 120 mesh) 10 produced in China
300 parts of dried Kanto loam was mixed with 0 part, 25 parts of γ-butyl lactone and 0.3 part of magnesium α-ketoglutarate were mixed well, and 240 parts of water was added to and kneaded to obtain 1,
30 kg / cm ² by filling the mold of 000 × 1,000
Press molding with pressure. Immediately after demolding regardless of the curing time and curing at 80 ° C. and humidity of 60% for 8 hours, a molded product having a compressive strength of 60.3 N / mm ² and a specific gravity of 2.1 was obtained. This product is suitable for building material panels.

[Example 13] In [Example 4], 100 parts of Chinese light-burning magnesia (80 to 120 mesh), 30 parts of lime superphosphate, 5 parts of natural type 2 anhydrous gypsum, 0.1 part of sodium citrate Parts were added, and bentonite 100 was added to this.
200 parts of river sand, 400 parts of gravel, 65% water
(100 parts of light-burning magnesia, lime superphosphate, natural type 2 anhydrous gypsum) was added and kneaded, and then 1000 parts of MITEI was added and further kneaded to obtain 100φ.
Fill the mold of × 200 and harden it.
After 8 minutes and 134 minutes of termination, the mold is removed after 7 days. When this molding is cured in air for 28 days, the compressive strength is 32.4 N / m.
It has m ² and a specific gravity of 2.75 and has almost the same physical properties as concrete.

[Example 14] In [Example 4], 100 parts of Chinese light-burning magnesia (80 to 120 mesh), 30 parts of heavy superphosphate, 5 parts of natural type 2 anhydrous gypsum, and 0.1 part of sodium citrate were used. Parts, and 100 parts of Kanto loam are mixed, 200 parts of river sand, 70 parts of water, and 1000 parts of MYTAY, 0.5 part are added and further kneaded.
A reinforcing bar lath is put in a mold of × 1000, and the mixture is poured and cured. When this molded product is aged in air for 28 days, it has a compressive strength of 28.9 N / mm ² and a specific gravity of 2.5, and has substantially the same physical properties as a mortar plate.

[Embodiment 15] Chinese light-burning magnesia (8
0-120 mesh) 100 parts Kanto loam 300 parts,
Make a slurry with 240 parts of water and mix it under agitation 1
000, 0.5 part, and 1.0 part of ferrous sulfate were added, and
Pour it onto the cardboard of No. 6 and put 0.6 cardboard on the slurry in the uncured to harden it, then add it to a water content of 5
% To dry to obtain a gypsum board-like product.

Weight g / m ² 2.7, tensile strength kg
/ M ² 22, breathability sec / 100cc air300
[Example 16] 100 parts of Chinese light-burning magnesia (80-120 mesh), 30 parts of superphosphate, 5 parts of natural type 2 anhydrous gypsum, and 0.1 part of sodium citrate were added, and Kanto loam was added. Mix 100 parts, 200 parts river sand, 70 parts water
Parts, and 0.5 parts of MITEY 1000 are added and further kneaded, and a reinforcing bar lath is put in a 1000 × 1000 mold, and the mixture is poured and cured. When this molded product is cured in air for 28 days, the compressive strength is 28.9 N / mm.
^{2. With} a specific gravity of 2.5, it has almost the same physical properties as a mortar board.

[Example 17] Chinese light-burning magnesia (8
0 to 120 mesh) 100 parts, Akita diatomaceous earth (towlite) 400 parts, sustained release phosphoric acid metaphosphoric acid powder (85% phosphoric acid 5 parts adsorbed on 30 parts diatomaceous earth 50)
(Slow-release phosphoric acid calcined at 0 ° C.) was mixed, 320 parts of water was added and mixed, and 5 parts of 6 mm nilon fiber was added to and mixed with the slurry to which 0.5 part of the water reducing agent F-10 (Mortac) was added. Knead and put in a 40 × 40 × 160 mold to mold.
This molded product, when cured for 28 days, has a compressive strength of 12.8N.
/ Mm ² , specific gravity 1.3, good breathability, breathability sec /
It is 100 cc air530.

[Example 18] Light burned magnesia (80-120 mesh) 1 produced in China in the composition of [Example 15] 1
100 parts Kanto loam 300 parts with agitating 10
00, 0.5 part, ferrous sulfate 1.0 part, citric acid 1.0
And 180 parts of water to prepare a granular kneaded product, and the uncured product is loaded onto the soil and spread with a rammer to obtain a water-permeable pavement material having a porosity of 25%.

[Example 19] Light burned magnesia (8
0 to 120 mesh) 120 parts, 100 parts rice husk charcoal,
Sustained-release phosphoric acid metaphosphoric acid powder (sustained-release phosphoric acid obtained by adsorbing 5 parts of 85% phosphoric acid on 30 parts of chaffed charcoal and calcined at 500 ° C.) was mixed with 150 parts of water, and water reducing agent F was added. -1
0.5 part of 0 (Moltack) is added and the mixture is molded into a granule with a mixer. The obtained granular molding has a compressive strength of 1.8N.
/ Mm ² , specific gravity 1.1. When this molded product is aged for 28 days, it has a compressive strength of 12.8 N / mm ² , a specific gravity of 1.3 and good breathability, and has a breathability of sec / 100 cc air53.
It is 0.

[0070]

EFFECT OF THE INVENTION The present invention is a method for obtaining a cured product using soil, wherein light-burning magnesia is the main component of the curing agent.
A soil hardening agent that has the characteristics of obtaining a structure with higher strength than Portland cement and low environmental load and low pH, and a structure with good moisture absorption and absorption properties of water, and a characteristic that cement structures do not have. A composition and a method for manufacturing the same can be provided.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI C04B 18:14 C04B 24:04 24:04 18:10 Z 18:10 22:16 22:16) 111: 70 111: 70 C09K 103: 00 C09K 103: 00 109: 00 109: 00 (56) References Japanese Patent Laid-Open No. 7-126048 (JP, A) Japanese Patent Laid-Open No. 8-143353 (JP, A) Japanese Patent Laid-Open No. 8-169747 (JP, A) ) JP-A-10-316967 (JP, A) JP-A-61-266341 (JP, A) JP-A-55-20216 (JP, A) JP-A-55-51745 (JP, A) JP-A-55- 140747 (JP, A) JP-A-11-49552 (JP, A) JP-A-1-270552 (JP, A) JP-A-4-233927 (JP, A) JP-A-11-228196 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C09K 17/00-17/50 C04B 28/00-28/12

Claims (4)

(57) [Claims] 1. A sustained release phosphoric acid component containing 100 parts by weight of light burned magnesia and 1 to 100 parts by weight of at least one selected from gypsum, Portland cement and blast furnace slag.
Then, water-soluble phosphate fertilizer or activated sludge incineration ash 5-100 weight
A soil hardening agent composition containing 5 parts by weight or 5 to 30 parts by weight of adsorbed calcined metaphosphoric acid, and 0.1 to 1.0 parts by weight of an oxycarboxylic acid salt or a ketocarboxylic acid salt as a setting retarder. 2. A weight ratio of 100 parts by weight of light-burning magnesia
A contract containing 5 to 30 parts by weight of an organic carbonate compound as a reactant
The soil hardening agent composition according to claim 1. 3. The soil hardening agent composition according to claim 1 or 2.
A method for producing a hardened soil material, which comprises adding to the soil. 4. The soil hardening agent composition according to claim 1 or 2.
To use civil engineering structures or related reinforcement materials
A method for producing a molded article for producing a compounded article.