JP7444306B2 - Hardening material, hardening material liquid, chemical liquid for soil stabilization, method for producing the chemical liquid, and ground stabilization method - Google Patents

Description

The present invention relates to a hardening material, a hardening material liquid, a soil stabilizing chemical, a method for producing the chemical, and a ground stabilization method.

Cement suspension, which is made by suspending cement in water, is used as a soil stabilizing chemical solution that is injected into the ground to strengthen the ground. It takes several hours. If the setting speed is slow, the cement in the cement suspension will settle, making it impossible to harden the entire cement.
In addition, if the injected cement suspension comes into contact with flowing water, such as in the ground where groundwater is flowing or in the gap between the embankment and the ground, if the cement suspension is slow to set, the cement suspension may When mixed with running water, the concentration of cement decreases, making it impossible for the cement to harden sufficiently.
Therefore, when using a cement suspension as a chemical solution for soil stabilization, the cement suspension has fluidity before being injected into the ground, gels in about 10 seconds after being injected, and quickly develops strength. are required to do so.

Therefore, recently, hardening agent liquids have been used to improve the hardening speed of cement suspensions.
For example, in Patent Document 1, slaked lime or quicklime is used as liquid A, and amorphous aluminum hydroxide, specifically aluminum sludge dry powder (aluminum sludge generated in alumite treatment is dried, aluminum hydroxide is amorphous). (maintained at the same temperature) as Solution B, and anhydrous gypsum is mixed with Solution A or B. Furthermore, an accelerator of alkali metal carbonate is mixed with Solution B, and Solutions A and B are mixed. A two-shot type injection material is disclosed, which is made by mixing liquids A and B. According to this injection material, the time required for gelation after mixing liquids A and B (gel time) can be about 10 seconds. It is said to be possible.

Japanese Patent Application Publication No. 2010-53023

However, in the case of ground where groundwater is flowing, there is a problem of further shortening the gel time. Furthermore, when amorphous aluminum hydroxide is used, there is a problem in that the gel time becomes long at low temperatures.

Therefore, an object of the present invention is to provide a hardening material, a hardening material solution, a soil stabilizing chemical solution, a method for producing the chemical solution, and a ground stabilization method that have excellent instant setting properties and can further shorten the gel time. .
Another object of the present invention is to provide a hardening material, a hardening material solution, a soil stabilizing chemical solution, a method for producing the chemical solution, and a ground stabilization method that can shorten the gel time even at low temperatures.

The present invention includes the following aspects [1] to [6].
[1] A hardening material used by mixing with a main liquid containing lime and water to harden the main liquid, the curing material characterized by containing dry aluminum hydroxide gel and an alkali metal carbonate. .
[2] A hardening material used by mixing with a main liquid containing lime and water to harden the main liquid, which comprises amorphous aluminum hydroxide, an alkali metal carbonate, an alkali metal hydroxide, and/or an alkali metal silicate.
[3] A hardening material liquid characterized by containing the hardening material according to [1] or [2] and water.
[4] A chemical solution for soil stabilization characterized by containing the hardening material according to [1] or [2], lime, and water.
[5] A method for producing a chemical solution for soil stabilization, which comprises mixing a main material solution containing lime and water and the hardening material solution described in [3].
[6] A ground stabilization method characterized by mixing a main material liquid containing lime and water with the hardening material liquid described in [3] in the ground.

According to the present invention, it is possible to provide a hardening material, a hardening material solution, a soil stabilizing chemical solution, a method for producing the chemical solution, and a ground stabilization method that have excellent instant setting properties and can further shorten the gel time. . Furthermore, it is possible to provide a hardening material, a hardening material liquid, a soil stabilizing chemical, a method for producing the chemical, and a ground stabilization method that can shorten the gel time even at low temperatures.

The present invention will be explained in detail below.
As used herein, the term "consolidated body" refers to a substance in which the soil stabilizing chemical solution of the present invention has solidified in the ground.

[Hardening material]
The hardening material of the present invention is used by being mixed with a main liquid containing lime and water in order to harden the main liquid. The hardener of the present invention includes a dry aluminum hydroxide gel and an alkali metal carbonate. Alternatively, the hardening material of the present invention contains amorphous aluminum hydroxide, an alkali metal carbonate, and an alkali metal hydroxide and/or an alkali metal silicate.
Moreover, the hardening material of the present invention may contain other additives other than those mentioned above.
Each component contained in the hardening material of the present invention will be explained below.

(Dry aluminum hydroxide gel)
In the present invention, the dry aluminum hydroxide gel is a compound having a chemical composition of Al(OH) ₃ mH ₂ O, and is amorphous aluminum hydroxide. Examples of the dry aluminum hydroxide gel include those used in medical antacids and ulcer healing agents according to the Japanese Pharmacopoeia, but for industrial use, dry aluminum hydroxide gel used in adsorbents and the like is preferred. The aluminum oxide content of the dry aluminum hydroxide gel is preferably 45% or more, more preferably 50% or more.
Furthermore, the particle size of the dried aluminum hydroxide gel is preferably 40 to 120 μm, more preferably 60 to 100 μm, as measured by a laser diffraction scattering method. If the median diameter is equal to or larger than the above lower limit, particles will be less likely to fly and handling will be improved. On the other hand, if it is below the above upper limit, the reactivity will be high and the instantaneous setting will be excellent.

(Amorphous aluminum hydroxide)
Amorphous aluminum hydroxide includes all amorphous aluminum hydroxide. Examples of amorphous aluminum hydroxide include the aforementioned dried aluminum hydroxide gel, aluminum sludge generated during alumite treatment, and the like.
Dry aluminum hydroxide gel is included in amorphous aluminum hydroxide, but dry aluminum hydroxide gel is a type of amorphous aluminum hydroxide that has become amorphous in a more reactive state than other amorphous aluminum hydroxide gels. This is different from the aluminum sludge used in Patent Document 1.

(alkali metal carbonate)
Alkali metal carbonate is a component that adds instant setting properties in a combination of lime having gelling ability and dry aluminum hydroxide gel or amorphous aluminum hydroxide. When an alkali metal carbonate is blended into the main material liquid, it makes the main material liquid unstable, but even when it is blended into the hardening material liquid, it does not make the hardening material liquid unstable.

Examples of the alkali metal carbonate include carbonates of alkali metals such as Li ₂ CO ₃ , Na ₂ CO ₃ , and K ₂ CO ₃ . Only one type of alkali metal carbonate may be included, or a combination of two or more types may be included.

(alkali metal hydroxide)
Examples of the alkali metal hydroxide include LiOH, NaOH, and KOH. Only one type of alkali metal hydroxide may be included, or a combination of two or more types may be included.

(alkali metal silicate)
Examples of the alkali metal silicates include lithium silicate, sodium silicate, potassium silicate, and the like. Only one type of alkali metal silicate may be included, or a combination of two or more types may be included.

Examples of alkali metal silicates include alkali metal orthosilicates, alkali metal sesquisilicates, alkali metal metasilicates, alkali metal No. 1 silicates, alkali metal No. 2 silicates, alkali metal No. 3 silicates, and alkali metal No. 4 silicates. Examples include aqueous solutions, granular products, and powder products of silicates. Among them, alkali metal orthosilicates with high alkalinity are preferred, and sodium orthosilicate is more preferred, since they are highly effective in increasing the ability to add instant setting properties.

(Additive)
In addition to amorphous aluminum hydroxide (including dried aluminum hydroxide gel), alkali metal carbonates, alkali metal hydroxides, and alkali metal silicates, the hardening material of the present invention includes water reducing agents, antifoaming agents, and thickening agents. It may contain various additives such as additives.

Examples of water reducing agents include lignin sulfonates or their derivatives, polycarboxylic acids, aminosulfonic acids, oxyorganic acid salts, alkylaryl sulfonates, polyoxyethylene alkyl ethers, polyol composites, and high-grade polymers. Various water reducing agents, dispersants, high performance water reducing agents, whose main ingredients are alcohol sulfonate, melamine formalin condensate (sulfonate, (modified) methylol), naphthalene sulfonate formalin condensate, etc. Examples include superplasticizers.

Antifoaming agents include higher alcohols, alkylphenols, diethylene glycols, dibutyl phthalates, water-insoluble alcohols, tributylphosphates, polyglycols, silicones, and ethylene oxide-propylene oxide copolymers. Examples include agents.

Thickeners include cellulose ethers such as methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxyethylmethylcellulose, hydroxybutylmethylcellulose, hydroxyethylethylcellulose, and carboxymethylcellulose; polyacrylamide, sodium polyacrylate, polyacrylamide-polyacrylic Various thickeners include acrylic polymers such as acid-soda copolymers and partially hydrolyzed polyacrylamide; water-soluble polymers such as polyvinyl alcohol, polyethylene oxide, sodium alginate, casein, and guar gum.

In addition, the curing material of the present invention may contain various setting retarders such as organic carboxylic acids such as gluconic acid and citric acid, and salts thereof, in order to improve the stability of the curing material and adjust the gel time. can also be added.

(Method for manufacturing hardened material)
The hardening material of the present invention may be prepared by adding each of the raw materials alone into water at the site, or by mixing them in powder form in advance. It is better to mix aluminum gel (including aluminum gel) and alkali carbonate in powder form before use. By blending these, it is possible to prevent the alkali metal carbonate from solidifying. The alkali metal hydroxide and alkali metal silicate may be mixed in advance, but they may also be mixed in separate forms so that they can be added as appropriate depending on the site environment.

The powder can be mixed by mixing each component in a desired amount using a commonly used mixer. The mixer used may be fixed at a factory or construction site, or may be mounted on a mixer truck.
Preferably, each component is thoroughly mixed. By thoroughly mixing each component, a homogeneous hardening material liquid can be quickly produced.

The content of amorphous aluminum hydroxide (including dried aluminum hydroxide gel), alkali metal carbonate, alkali metal hydroxide and/or alkali metal silicate contained in the hardening material of the present invention is as described below. Any ratio may be used as long as it satisfies the preferred composition of each component of the hardening material liquid of the present invention.

[Main liquid]
The main material liquid according to the present invention contains lime and water. The main liquid may contain other additives in addition to lime and water.
For example, hydraulic cement, gypsum, sodium sulfate, and potassium sulfate are preferably contained in the main material liquid from the viewpoint of improving the initial and final strength of the solidified body.

Each component contained in the main material liquid will be explained below. Note that the details of the other additives are the same as those of the other additives in the hardening material of the present invention described above.

(lime)
Lime takes the form of calcium hydroxide (Ca(OH) ₂ ) in water, and includes, for example, slaked lime (Ca(OH) ₂ ) and quicklime (CaO). Among these, slaked lime is preferred because it is easy to handle.

The Blaine value of lime is preferably 6,000 to 20,000 cm ² /g, more preferably 8,000 to 15,000 cm ² /g. If the Blaine value of lime is equal to or higher than the above lower limit value, the instant setting property will be better. On the other hand, if it is below the above upper limit, the viscosity of the main material liquid will decrease and agglomeration will be less likely to occur when mixed with water.
Only one type of lime may be included, or a combination of two or more types may be included.

The content of lime in the main liquid according to the present invention is preferably 10 to 50 kg, more preferably 20 to 40 kg, per 200 L of the main liquid (400 L of total chemical solution). If the lime content is at least the above lower limit, the instant setting property will be better. If it is below the above upper limit, the viscosity of the main material liquid is suppressed, so that it becomes easy to pump it, and the main material liquid or the soil stabilizing chemical solution described below easily permeates into the ground. Moreover, if it is below the said upper limit, the volume of a solid body can be made larger with respect to the component amount in a main material liquid.

(hydraulic cement)
In the main material liquid according to the present invention, although it is not essential to contain hydraulic cement, it is preferable to include it from the viewpoint of increasing the initial and final strength of the solidified body.
Examples of the hydraulic cement include normal, early-strength, ultra-early-strength, moderate-heat and white Portland cements, mixed cements such as blast furnace cement, silica cement, and fly ash cement, fine particle cements, ultrafine particle cements, and ultra-high-grade cements. Examples include fine particle cement, granulated blast furnace slag, and alumina cement. Since it exhibits hydraulic properties due to the presence of lime, hydraulic cement also includes pozzolan reactive substances. Examples of the pozzolan-reactive substance include silica fume, fly ash, activated kaolin, and the like.
Only one type of hydraulic cement may be included, or a combination of two or more types may be included.

When the main material liquid according to the present invention contains hydraulic cement, the content of hydraulic cement in the main material liquid is preferably 25 to 300 kg, and 50 to 200 kg per 200 L of the main material liquid (400 L of total chemical solution). More preferably, 70 to 150 kg is particularly preferred. If the content of hydraulic cement is at least the above lower limit, the compressive strength of the solidified body can be further increased. On the other hand, if it is below the above upper limit, the viscosity of the main material liquid is suppressed, so that it becomes easy to pump the main material liquid or the soil stabilizing chemical liquid described later into the ground. Moreover, if it is below the said upper limit, the volume of a solid body can be made larger with respect to the component amount in a main material liquid.

(plaster)
In the main material liquid according to the present invention, it is not essential to include gypsum, but it is preferable to include it from the viewpoint of increasing the initial and final strength of the solidified body.
Examples of gypsum include various forms of gypsum, such as type II anhydrite, type III anhydrite, alpha hemihydrate gypsum, beta hemihydrate gypsum, and dihydrate gypsum. Among these, type II anhydrite is preferred because the compressive strength of the solid body is higher. Furthermore, sulfates such as sodium sulfate, potassium sulfate, and aluminum sulfate can also be added as a source of sulfate ions contained in gypsum.

The Blaine value of gypsum is preferably 2,500 to 15,000 cm ² /g, more preferably 6,000 to 10,000 cm ² /g. If the Blaine value of gypsum is greater than or equal to the above lower limit, the compressive strength of the solidified body will be higher. On the other hand, if it is below the above upper limit, the viscosity of the main material liquid will decrease and agglomeration will be less likely to occur when mixed with water.
Only one type of gypsum may be included, or a combination of two or more types may be included.

When the main liquid according to the present invention contains gypsum, the content of gypsum in the main liquid is preferably 1 to 20 kg, more preferably 3 to 10 kg, per 200 L of the main liquid (400 L of total chemical solution). If the lime content is at least the above lower limit, the initial and final strength of the solidified body will be high. If it is below the above upper limit, the viscosity of the main material liquid is suppressed, so that it becomes easy to pump it, and the main material liquid or the soil stabilizing chemical solution described below easily permeates into the ground. Moreover, if it is below the said upper limit, the volume of a solid body can be made larger with respect to the component amount in a main material liquid.

(ratio of gypsum and lime)
When the main material liquid according to the present invention contains lime and gypsum, the mass ratio of gypsum (G) and lime (L) in the main material liquid is the value of the gypsum ratio "G/(G+L)", which is 0. 05 to 0.85 is preferable, and 0.1 to 0.4 is more preferable. If "G/(G+L)" is greater than or equal to the above lower limit, the compressive strength of the solidified body will be higher. On the other hand, if it is below the above-mentioned upper limit, the instant setting property will be better. Moreover, if it is below the said upper limit, the volume of a solid body can be made larger with respect to the component amount in a main material liquid.

(water)
Examples of water include tap water, industrial water, groundwater, river water, and seawater. Among these, tap water and industrial water are preferred in order to fully exhibit the effects of the present invention.

(Method for producing main material liquid)
The main liquid according to the present invention is produced by dispersing each component in desired amounts in water using a known stirrer or the like.
When producing the main material liquid, the order of mixing lime, water, hydraulic cement, gypsum, and other additives blended as necessary is not particularly limited. The method for producing the main material liquid is to disperse lime, gypsum mixed as necessary, and optional additives such as dispersants and antifoaming agents in water, and then add hydraulic cement as necessary. , a method of stirring and mixing for a predetermined period of time is preferred.

Examples of methods for producing the main material liquid at a construction site where ground stabilization is to be performed include the following methods (1) to (3).
(1) A method in which lime, hydraulic cement, and gypsum mixed as necessary are brought to the construction site separately, mixed in a predetermined ratio, and then water is added and mixed. (2) Lime, as necessary A method in which a mixture of the main materials mixed with hydraulic cement and gypsum in a predetermined ratio is brought to the construction site, water is added, and mixed. (3) Materials other than hydraulic cement are mixed in a predetermined ratio. A method in which a mixture pre-mixed in quantitative ratios is delivered to the construction site together with hydraulic cement, and water is added to it to mix it. Among these methods, methods (2) and (3) above are used because they can simplify the work at the construction site. The method is preferred.

Preferably, each component is sufficiently dispersed in water. By sufficiently dispersing each component in water, the main material liquid and hardening material liquid are mixed more uniformly, the gel time is stabilized, and the variation in compressive strength of the solid body is reduced.

[Curing material liquid]
The hardening material liquid of the present invention is a hardening material liquid used for curing a main material liquid containing lime and water. The curing material liquid is characterized in that it contains the above-mentioned curing material of the present invention and water.

The water contained in the hardening material liquid, the content of each component in the hardening material liquid, and the method for producing the hardening material liquid will be described below. Note that the details of the components contained in the hardening material are the same as those in the hardening material of the present invention described above.

(water)
Examples of water include tap water, industrial water, groundwater, river water, and seawater. Among these, tap water and industrial water are preferred in order to fully exhibit the effects of the present invention.

(Content of each component in hardening material liquid)
The lower limit of the content of amorphous aluminum hydroxide (including dried aluminum hydroxide gel) in the hardening material liquid of the present invention is preferably 2 to 20 kg per 200 L of the hardening material liquid (400 L of total chemical solution). , 4 to 12 kg is more preferable, and 6 to 8 kg is particularly preferable. If the content of amorphous aluminum hydroxide (including dried aluminum hydroxide gel) is at least the above lower limit, the gel time will be shortened, and the time required to develop strength after gelation will be shortened. On the other hand, if it is below the above upper limit, the viscosity of the hardening material liquid is suppressed, so the main material liquid and the hardening material liquid are mixed more uniformly, and variations in the compressive strength of the solid body are reduced. Moreover, if it is below the said upper limit, it will become easy to pump by a pump, and a hardening material liquid or the chemical|medical solution for soil quality stabilization mentioned later will permeate into the ground easily.

The content of alkali metal carbonate in the hardening material liquid of the present invention is preferably 2 to 12 kg, more preferably 3 to 10 kg, and still more preferably 4 to 8 kg, per 200 L of the hardening material liquid (400 L of total chemical solution). preferable. If the content of the alkali metal carbonate is within the above range, the gel time can be further shortened. In order to further exhibit the effects of the present invention, it is preferable that no undissolved alkali metal carbonate remains when preparing a hardening material liquid from a hardening material.

When the hardening material liquid of the present invention contains an alkali metal hydroxide and/or an alkali metal silicate, the content of the alkali metal hydroxide and/or alkali metal silicate in the hardening material liquid of the present invention is Preferably, the pure content is 0.5 to 5 kg, more preferably 1 to 4 kg, and even more preferably 1.5 to 3 kg, per 200 L of hardening material liquid (400 L of total chemical solution). If the content of the alkali metal hydroxide and/or alkali metal silicate is at least the above lower limit, the gel time can be increased particularly at low temperatures. Moreover, if the content of the alkali metal hydroxide and/or alkali metal silicate is below the above-mentioned upper limit, the viscosity of the hardened material is low, the degree of aggregation is also low, and the pumpability can be improved.

(Method for producing hardening material liquid)
The hardening material liquid of the present invention is produced by dispersing each component of the hardening material in water using a known stirrer or the like. The dispersion method may be a method in which a pre-produced hardening material is dispersed in water, or a method in which each component of the hardening material is dispersed in water in an arbitrary order.

Preferably, each component is sufficiently dispersed in water. By sufficiently dispersing each component in water, the main material liquid and hardening material liquid are mixed more uniformly, and variations in the compressive strength of the solid body are reduced.

[Chemical solution for soil stabilization]
The soil stabilizing chemical solution of the present invention contains the hardening agent of the present invention, lime, and water. That is, the soil stabilizing chemical solution of the present invention contains lime, dry aluminum hydroxide gel, alkali metal carbonate, and water. Alternatively, the soil stabilizing chemical solution of the present invention contains lime, amorphous aluminum hydroxide, an alkali metal carbonate, an alkali metal hydroxide and/or an alkali metal silicate, and water. The soil stabilizing chemical solution of the present invention may contain hydraulic cement, gypsum, and other additives in addition to these components.

The details of each component contained in the soil stabilizing chemical solution are the same as those in the hardening material of the present invention, the main material liquid according to the present invention, and the hardening material liquid of the present invention described above.

[Method for manufacturing chemical solution for soil stabilization]
The method for producing the chemical solution for soil stabilization of the present invention may be a method of dispersing each component in water using a known stirrer or the like, or a method of adding a hardening agent or a component of the hardening agent to the main material liquid. Alternatively, a method of adding components other than water in the main material liquid to the hardening material liquid, or a method of mixing the main material liquid and the hardening material liquid may be used. Among these, the method for producing the soil stabilizing chemical is preferably a method of mixing the main material liquid and the hardening material liquid, from the viewpoint of simplifying the work at the construction site and further improving the instant setting property.

Hereinafter, a method of mixing the main material liquid and the hardening material liquid will be explained.
The two liquids may be mixed before being injected into the ground, or may be mixed while each liquid is injected into the ground. If the mixture is to be mixed before being poured into the ground, it may be mixed by a general stirring method using a stirrer or the like that is normally used when manufacturing cement. When mixing each liquid while injecting it into the ground, for example, the main material liquid and hardening material liquid are individually pumped into the Y-shaped pipe, stirring device, and injection pipe using pumps with the same liquid delivery capacity per unit time. The main material liquid and the hardening material liquid are sent separately through the inner and outer pipes of a double pipe. , a method in which the main material liquid and hardening material liquid are combined and mixed in the ground during injection. In order to prevent both solutions from hardening during injection, the soil stabilizing chemical solution is preferably manufactured immediately before or during injection, and more preferably during injection.

From the viewpoint of ease of construction, it is preferable to mix the main material liquid and hardening material liquid at a volume ratio of 7:3 to 3:7, and more preferably at a volume ratio of 6:4 to 4:6. Preferably, mixing in equal volumes is particularly preferred.

[Ground stabilization method]
The ground stabilization method of the present invention includes a first aspect in which the above-mentioned soil stabilizing chemical solution of the present invention is injected into the ground, and a second aspect in which the main material liquid and the hardening material liquid are mixed in the ground. be.
A specific method of the first embodiment is a method in which a soil stabilizing chemical solution is obtained in the same manner as the method for producing a soil stabilizing chemical solution of the present invention described above, and the chemical solution is injected into the ground.
A specific method of the second embodiment is a method in which the main material liquid and the hardening material liquid are injected into the ground using separate injection pipes, and the two liquids are brought together and mixed within the ground. In this embodiment, injection may be performed at a pressure of 50 to 1000 kg/cm ² using an injection tube having an injection nozzle.

[Effect]
According to the present invention, by using dry aluminum hydroxide gel, it is possible to provide a hardening material with a short gel time, a hardening material liquid, a soil stabilizing chemical, a method for producing the chemical, and a ground stabilization method. Furthermore, when using amorphous aluminum hydroxide, the gel time can be shortened even at low temperatures.
The effects of the present invention are presumed to be due to the following mechanism.

The dried aluminum hydroxide gel contained in the curing material used in the present invention is amorphous in a more reactive state than the aluminum sludge used in Patent Document 1, and is different from aluminum sludge. . It is believed that this allows the reaction with the alkali metal carbonate and lime to proceed very quickly, thereby shortening the gel time.
Furthermore, since the alkali metal hydroxides and alkali metal silicates used in the present invention have high alkalinity, they increase the activity of amorphous aluminum hydroxide and the reaction with alkali metal carbonates and lime proceeds rapidly. Furthermore, it is believed that by adding an alkali metal hydroxide and/or an alkali metal silicate, a short gel time can be ensured even at low temperatures.

The present invention will be explained in more detail below using Examples and Comparative Examples, but the present invention is not limited to these Examples.
The materials used in the following Examples and Comparative Examples, methods for preparing the main material liquid and hardening material liquid, and various measurement and evaluation methods are as follows.

[material]
(Main material liquid)
・Hydraulic cement: Ordinary Portland cement ・Gypsum: Type II anhydrous gypsum (Brain value: 6500 cm ² /g)
・Lime: Slaked lime (Brain value: 13000cm ² /g)
・Water reducer: sodium naphthalene sulfonate, formaldehyde condensate ・Set retarder: citric acid, monohydrate ・Water: tap water

(hardening material liquid)
・Dried aluminum hydroxide gel (amorphous aluminum hydroxide): Tomita AD200P (manufactured by Tomita Pharmaceutical Co., Ltd., median diameter: 80 μm)
・Alkali metal carbonate: Soda ash (anhydrous sodium carbonate)
・Sodium hydroxide: Granular ・Alkali metal silicate: Sodium orthosilicate powder (80% pure)
・Water: Tap water

[Preparation method of main material liquid]
Using materials adjusted to 20℃, in a room at 20℃, a mixture of lime, gypsum, water reducer, etc. is dispersed in water, and when hydraulic cement is used, ordinary Portland cement is dispersed and stirred. The main material liquid was obtained. Stirring was carried out for a predetermined period of time using a magnetic stirrer at a rotation speed of 650 to 750 rpm with a 4 cm long stirrer bar placed in a 200 mL disc cup containing 200 mL of the main liquid.
The content of each component in the main material liquid was as shown in Tables 1 to 3.

[Preparation method of hardening material liquid]
Using materials adjusted to 20℃, in a room at 20℃, the hardening material mixed with dried aluminum hydroxide gel and alkali metal carbonate is dispersed in water, stirred, and if necessary, sodium hydroxide etc. are added to cure the hardening material. I got the liquid. Stirring was carried out for a predetermined period of time using a magnetic stirrer at a rotation speed of 650 to 750 rpm with a 4 cm long stirrer bar placed in a 200 mL disc cup containing 200 mL of hardening material liquid.
The content of each component in the hardening material liquid was as shown in Tables 1 to 3.

[Measurement of gel time]
First, put 50 mL of the obtained main material liquid and 50 mL of hardening material liquid into 200 mL disk cups A and B, and after pouring the entire amount of main material liquid into disk cup B containing hardening material liquid, both liquids The mixed solution was immediately transferred to Discup A, which contained the main material liquid, and then transferred to Discup B, which contained the hardening material liquid. It took about 2 seconds from the time the main material liquid and hardening material liquid were first mixed. Next, while observing the condition of the disc cup B, the disc cup B was tilted at 45 degrees and the time required until it stopped moving was checked.

[Example 1]
In Example 1, the gel time at 20° C. was measured using the main material liquid and curing material liquid prepared as described above with the components shown in Table 1 and the contents of the components. The results are shown in Table 1.

Formulation 7 in Table 1 of Patent Document 1 states that the gel time for a similar formulation is 9 seconds.
According to the present invention, as is clear from Table 1, by using the same amount of dried aluminum hydroxide gel instead of aluminum sludge, it was confirmed that the gel time came in 3 seconds, which was much shorter than in Patent Document 1. .

[Example 2]
In Example 2, the gel time at 20° C. was measured using the main material liquid and curing material liquid prepared as described above with the components shown in Table 2 and the contents of the components. The results are shown in Table 2.

Formulation 1 in Table 2 of Patent Document 1 describes a gel time of 14 seconds with the same formulation as above.
According to the present invention, as is clear from Table 2, by using the same amount of dried aluminum hydroxide gel instead of aluminum sludge, it was confirmed that the gel time came in 7 seconds, which was much shorter than that in Patent Document 1. .

[Examples 3 to 5 and Comparative Examples 1 and 2]
In Examples 3 to 5 and Comparative Examples 1 and 2, the gel time at 10°C and 20°C was determined using the main material liquid and curing material liquid prepared as described above with the ingredients shown in Table 3 and the content of the ingredients. were measured respectively. The results are shown in Table 3.

As shown in Example 3, it was confirmed that by adding 2 kg of sodium hydroxide, the gel time was within 10 seconds even at 10°C.
Furthermore, as shown in Examples 4 and 5, it was confirmed that the gel time could be shortened by adding sodium orthosilicate, and by adding 2 kg, the gel time could be reduced to within 10 seconds.

The hardening material, hardening material liquid, soil stabilizing chemical liquid, method for producing the chemical liquid, and ground stabilization method of the present invention can be applied to, for example, voids in the ground, voids between a sea wall embankment and the ground, cavities caused by liquefaction, It is useful for reinforcing the ground by injecting it into cavities at the back of tunnels, etc.

Claims (6)

A chemical solution containing a main material liquid containing lime and water, and a hardening material used for curing the main material liquid,
the curing material contains a dry aluminum hydroxide gel and an alkali metal salt carbonate;
Per 400 L of total chemical solution, the dry aluminum hydroxide gel is 2 to 43.4 kg and the alkali metal salt carbonate is 2 to 12 kg , and per 400 L of total chemical solution, the lime is 10 kg to 153.6 kg. A chemical solution containing such proportions. A chemical solution containing a main material liquid containing lime and water, and a hardening material used for curing the main material liquid,
The hardening material contains amorphous aluminum hydroxide, an alkali metal carbonate, and an alkali metal silicate,
Per 400 L of total chemical solution, the amorphous aluminum hydroxide is 2 to 20 kg, the alkali metal carbonate is 2 to 12 kg, and the alkali metal silicate is 0.5 to 5 kg , and per 400 L of total chemical solution, the lime is 2 to 20 kg. A chemical solution containing a proportion of 10 kg or more and 153.6 kg or less . A soil stabilizing chemical solution comprising the chemical solution according to claim 1 or 2. A method for producing a chemical solution by mixing a main material liquid containing lime and water and a curing material used for curing the main material liquid, the method comprising:
the curing material contains a dry aluminum hydroxide gel and an alkali metal salt carbonate;
Per 400 L of total chemical solution, the dry aluminum hydroxide gel is 2 to 43.4 kg and the alkali metal salt carbonate is 2 to 12 kg , and per 400 L of total chemical solution, the lime is 10 kg to 153.6 kg. A method of manufacturing a chemical solution that mixes in such proportions. A method for producing a chemical solution by mixing a main material liquid containing lime and water and a curing material used for curing the main material liquid, the method comprising:
The hardening material contains amorphous aluminum hydroxide, an alkali metal carbonate, and an alkali metal silicate,
Per 400 L of total chemical solution, the amorphous aluminum hydroxide is 2 to 20 kg, the alkali metal carbonate is 2 to 12 kg, and the alkali metal silicate is 0.5 to 5 kg , and per 400 L of total chemical solution, the lime is 2 to 20 kg. A method for producing a chemical solution in which the chemical solution is mixed at a ratio of 10 kg or more and 153.6 kg or less . A ground stabilization method in which the chemical solution according to claim 1 or 2 is injected into the ground.