KR20230060396A - The colloidal silica composition for the grouting using the aluminum salt and construction method using the same - Google Patents

Abstract

The present invention relates to a grouting colloidal silica composition using aluminum salt and a construction method using the same, which provide a safe construction site. The construction method of the present invention comprises: a first process of obtaining a colloidal silica solution; a second process of obtaining a suspension composition; and a third process of obtaining a completely hardened body.

Description

The colloidal silica composition for the grouting using the aluminum salt and construction method using the same}

The present invention promotes solidification of the ground by supplying a chemical liquid to the pores of the ground to improve the ground or prevent irrigation, increase the bearing capacity of the ground, decrease the permeability, and colloidal for integrating the ground and the structure. It is an invention in the technical field related to a colloidal silica composition for grouting using an aluminum salt instead of an inorganic acid having a very low pH in order to prepare a grouting agent made of silica and a construction method using the same.

The application of the manufacturing method by high-speed stirring of a strong acidic inorganic acid and liquid silicate when manufacturing chemically unstable colloidal silica so that the silica sol-gel method can be performed for the conventional grouting gel time Chemically unstable colloidal silica is obtained by high-speed stirring of aluminum salts (Inorganic salts) and silicates, which are environmentally mild and improve the physical properties of cement solids, and the grouting sol-gel time can be controlled. It is a technology related to providing a grouting composition containing chemically unstable colloidal silica and an environmentally friendly construction method using the same.

The grouting method is the application of various types of cement, mortar, and chemicals to the foundation ground, around the structure, or inside the structure itself for the purpose of solidifying the ground for soft ground, increasing the bearing capacity of the ground, reducing the permeability, and integrating the ground with the structure. It is a technique of injecting grout on the back.

A curtain installed for the purpose of making water-stop walls by injecting various types of cement, mortar, or reactive chemicals into the periphery of a structure or into the structure itself or its interior when the foundation ground is soft. There are grouting, integration of structures such as concrete dams with the foundation rock mass, and consolidation grouting conducted for the purpose of improving the deformability and strength of the foundation rock mass.

In general, soft ground related to grouting refers to the ground in a state where the superstructure cannot be supported. For example, soft clay, loose sandy soil, organic soil, etc. belong to this category, and roads, bridges, If the building is left as it is, the amount of settlement becomes excessive and the lack of bearing capacity causes safety problems. Therefore, soft ground improvement as a means to eliminate safety problems in constructing any object by improving the soft ground where these problems are expected It is expected that the grouting method will be widely used as a construction method.

In addition, when a solid foundation ground is required for road construction, and excessive construction costs are unavoidable in order to avoid the soft ground section, it is necessary to raise the hardness to have the strength required for ground construction. .

In the prior art, the prior art disclosed to obtain a grouting composition containing colloidal silica is as follows.

According to Korea Patent Publication No. 10-2020-0123592, it is possible to maintain fluidity even after gel formation, so that it can be advantageously applied even in cases where there is a large amount of leakage or a lot of water in the cavity, or in areas with running water (flowing water). A composition and a plastic grouting method using the same are presented.

In Korea Patent Publication No. 10-2020-0051352 A, the grouting method for water-repellent CIP wall according to an embodiment includes a drilling hole forming step of forming a plurality of drilling holes in the ground of the rear surface of a CIP wall composed of a plurality of walls; an injection pipe installation step of inserting a casing into the drilled hole and installing an injection pipe in the casing; a first grouting material injection step of injecting a first grouting material made of cement milk at a low pressure through the injection pipe; A second grouting material injection step of injecting a second grouting material successively after injecting the first grouting material so that the surface of the first grouting material penetrated into the pores of the ground is coated; The acceptance grouting method is presented.

In Korea Patent Publication No. 10-2020-0041522, it is possible to control the solidification time and increase the compressive strength through the improvement of the components of the ground improvement material disclosed in the existing patent registration No. 0681272, suppressing flooding and maximizing ground reinforcement efficiency A method for manufacturing a grout injection material, a grout injection material manufactured thereby, and a grouting construction method using the same are presented.

Korean Patent Publication No. 10-2020-0016728 proposes a composition for multi-stage, eco-friendly, fast-setting steel pipe grouting that shortens the curing time of an injection material, exhibits rapid initial strength, and has eco-friendliness.

In Korea Patent Publication No. 10-2019-0085742, preparing a sodium silicate aqueous solution by mixing 30 to 60% by volume of water glass and 40 to 70% by volume of water; II) mixing the sodium silicate aqueous solution and carbonated water in a weight ratio of 5:1 to 10:1 to obtain an active silicate chemical solution; and III) mixing the active silicate chemical solution and the cement aqueous solution in a volume ratio of 1:1 and spraying and injecting them into the ground and gelling them.

In Korea Patent Publication No. 10-2017-0165818, it contains 10 to 80% by weight of a lightweight inorganic binder, 10 to 80% by weight of fine aggregate, 0.01 to 20% by weight of a performance improver, and 1 to 50% by weight of water, and the performance improver is ethylene acetic acid 75 to 99% by weight of vinyl copolymer, 0.1 to 20% by weight of styrene vinyl chloride copolymer, 0.1 to 20% by weight of methyl methacrylate-vinylidene chloride copolymer, 0.1 to 20% by weight of polyarylsulfone and 0.01% by weight of lauryl acrylate ∼15% by weight, and the fine aggregate is composed of 50 to 99% by weight of siliceous silica sand and 1 to 50% by weight of bottom ash having a particle size in the range of 0.01 to 2mm, and the lightweight inorganic binder has a fineness of 3,500 to 8,000 cm2/ 20 to 90 wt% cement, 1 to 20 wt% calcium aluminate, 0.1 to 20 wt% blast furnace slag, 0.1 to 20 wt% metakaolin, 0.1 to 20 wt% phyllite powder, 0.1 to 15 wt% gypsum , Durable and self-healing lightweight grout material composition containing 0.1 to 10% by weight of calcium aluminate, 0.1 to 10% by weight of zeolite, 0.001 to 10% by weight of pumice and 0.01 to 10% by weight of a retardant, and grouting construction method using the same is presenting

Korea Patent Publication No. 10-2015-0020804 discloses a fluid inflow control device and an automatic inflow control device capable of adjusting the amount of silica sol produced by removing or minimizing the sodium (Na) component using a cation exchange resin and the inflow amount of a gelling agent and additives A method of manufacturing a high-strength grouting composition for preventing peeling, which can automatically adjust the gel time of grouting using a device, and a construction method using the same are proposed.

Korean Patent Laid-open Publication No. 10-2014-0099101 A proposes a method for producing grouting silica using by-products of a glass manufacturing process as silica entering the grouting material used in the grouting process when installing a geothermal heat pump.

In most of the conventional techniques as described above, as a strong acid is used when preparing a colloidal silica composition of a solution type or suspension type grouting liquid, a fatal hazard to the human body due to negligence during the operation for preparing a colloidal silica grouting agent. However, there was a problem in that natural damage caused by strong acids around the workplace could not be ruled out.

The inventors of the present invention are concerned about the risks to the human body due to the supply of inorganic acid with a very low pH during the manufacturing process of silica sol for grouting, which is made by supplying conventional liquid sodium silicate to an acidic solution rotating at high speed for durability and anti-leaching grouting. As a means to reduce the damage to the ground environment by alkali metals present in grouting solids, instead of using inorganic acids and silicates, it is environmentally mild and provides improvement in physical properties of cement solids. It is a technology that has been researched to find the possibility of using chemically unstable colloidal silica by high-speed stirring of aluminum salts and silicates. By using inorganic salts instead of strong acids, there is no danger to the human body. A construction method using a colloidal silica composition in a chemically unstable state so that the leaching of the grouting solid body does not occur and the gel time can be adjusted by the inflow amount of colloidal silica, gelling agent and additives It is a new technology proposed by confirming that it has not been disclosed in this prior art.

In this application, aluminum salts (inorganic salts) are used instead of strong acids for the grouting agent injected into the ground during the grouting process, so that there is no risk to the human body, the leaching of the grouting solid body does not occur, and at the same time, human life does not occur, This invention began with the task of developing a grouting chemical solution that not only controls the gel time of the grouting chemical injected into the body, but also improves the physical properties of the solid body cast underground.

The present application provides a construction method capable of adjusting the grouting gel time using the grouting composition, regardless of the shape of the soft ground, and reinforcing the ground while minimizing the risk of manpower and nature during grouting construction, or blocking walls and reinforcing materials. It is an object of the present invention to provide a grouting construction method capable of uniformly and efficiently providing structures such as the like.

In order to achieve the above object, the present invention is environmentally mild when preparing a chemically unstable colloidal silica solution that requires control of the gel time of the grouting agent injected into the ground during the grouting process. ), and chemically unstable colloidal silica is created by high-speed stirring of aluminum salts (Inorganic salts) and silicates, which can provide improvement in physical properties of the cement solid body, so that the conventional manufacturing method does not require the use of inorganic acids with very low pH. It is an invention of technical thought to provide a grouting composition containing chemically unstable colloidal silica and a construction method using the same so that the grouting sol-gel time can be controlled beyond the method.

Hereinafter, the technical idea of the present application will be described in detail.

The chemically unstable colloidal silica (silica sol) solution that needs to control the gel time of the grouting agent injected into the ground during the grouting process is aluminum sulfate, Al ₂ (SO ₄ ) ₃ To aluminum chloride (Aluminium chloride, AlCl ₃ ), one or more aluminum salts are selected, and the selected aluminum salt is configured to dissolve in water at 1.5 to 30% by weight, and the dissolved aluminum salt is 250 to 3,000 Supplying at least one silicate selected from liquid sodium silicate (Na ₂ SiO ₃ ) or potassium silicate (K ₂ SiO ₃ ) in the range of 15 to 45% by weight while stirring at a speed of rpm (revolutions per minute) chemically unstable colloidal silica capable of providing a gel time for grouting is produced, and the concentration of the aluminum salt and silicate can be changed and used to control the gel time and physical improvement of cement solids placed underground. It is an invention completed by confirming.

The present application is a technology for obtaining a colloidal silica composition as an aluminum salt in order to control the gel time of the grouting agent and providing a grouting construction method using the same, more specifically, aluminum sulfate (Aluminum sulfate, Al ₂ (SO ₄ ) ₃ Alternatively, a solution a is prepared so that one type of aluminum salt is selected from among aluminum chloride (AlCl ₃ ) and dissolved at 1.5 to 30 wt% in water,

A solution b is prepared so that one type of silicate selected from liquid sodium silicate (Na ₂ SiO ₃ ) or potassium silicate (K ₂ SiO ₃ ) is dissolved in water at 15 to 45 wt%,

A first method for obtaining a colloidal silica solution while controlling the inflow amount of a water-soluble additive and a hydrogel by an automatic fluid inflow control device when aluminum salt solution a and silicate b solution are mixed in an agitation reaction tank having an agitation speed of 250 to 3,000 rpm. step process,

In the step of preparing a grouting solution for increasing strength and controlling rapid setting or completeness, cement and additives for rapid setting or completeness control are supplied in quantitative quantities by an automatic powder inflow control device to obtain a suspension composition;

The colloidal silica solution obtained in the first step process and the suspension composition obtained in the second step process are uniformly mixed to obtain a grouting mixture, and the grouting mixture is introduced into the ground to form a three-dimensional network and hardens. It can be embodied as a construction method of a colloidal silica composition for grouting comprising a gelation process and a third step of curing and obtaining a complete cured product.

In the application method of the colloidal silica composition for grouting of the present application, the water-soluble additive used in the first step is selected from among sodium carbonate, potassium carbonate, ammonium carbonate, sodium bicarbonate, potassium bicarbonate, ammonium bicarbonate, and glyoxal. , Silicate can be applied to include 5 to 80 parts by weight based on 100 parts by weight, and the additives for rapid setting or completion control used in the second step process are bentonite, blast furnace slag powder, fly ash, 2.5 when one or more of fume silica, magnesium oxide, magnesium hydroxide, zinc oxide, aluminum oxide, potassium sulfate, calcium sulfate, calcium carbonate, and sodium borate is selected and the cement weight is based on 100 parts by weight It can be added and used in the range of ~ 35.0 parts by weight, and the cement used in the second step process is ordinary Portland cement belonging to Portland cement, medium heat Portland cement, early strong Portland cement, sulfate-resistant Portland cement, white Portland cement, oil well At least one type of cement is selected from blast furnace cement, fly ash cement, silica cement, ultra-low heating cement, geothermal well cement, RCCP cement, alumina cement, ultra-quick setting cement, and low-alkali cement for GRC. It can be used diluted in the range of 50 to 150 parts by weight based on 100 parts by weight of water, and the colloidal silica solution used in the first step process has a size of 10 to 100 nm and is 20 to 40 parts by weight in water. %, and the hydrogel used in the first step process is collagen, gelatin, fibrin, alginic acid, hyaluronic acid, chitosan At least one hydrogel selected from polyacrylic acid, polyethylene oxide, polyvinyl alcohol, and polyphosphazene is added to an aqueous colloidal silica solution containing an aluminum salt. It may be applied to include less than 1.0% by weight.

In the construction method of the present application, the liquid silicate used in the step of obtaining a chemically unstable colloidal silica aqueous solution capable of expressing the gel time of grouting is a chemically unstable grouting cole for controlling the gelation of the grouting agent by the silica sol-gel method. In addition to the purpose of producing this month's silica, a solution containing silicate was stirred while an aqueous solution containing aluminum salt was stirred at high speed to accelerate the solidification time of cement, promote hydration reaction, and improve initial strength and compressive strength in the grouting solidified body composed of final cement. It is preferable to use colloidal silica for gouting that is chemically unstable by supplying.

Embodiments in which the technology of the present application is specifically implemented are described in more detail by presenting examples of the invention in the following specific content for carrying out the invention.

The present technology manufactures a grouting injection material containing colloidal silica, which is chemically unstable by aluminum salts (inorganic salts), which is environmentally mild and improves the physical properties of concrete solids, and uses it to construct on the ground. During the process, by adjusting the inflow amount of colloidal silica and additives containing aluminum salt, it can be provided simultaneously to solution or suspension type grouting injection materials, and the gel time is rapid setting and slow setting ) is provided at an appropriate time, the composition of the injection material penetrates finely into the fine pores of the ground, and the aluminum salt present in colloidal silica allows the cement poured underground to form a high-strength solid body. It has the effect of being widely used in a wide range of ground reinforcement field technologies as well as securing technological competitiveness.

The present technology has the effect of providing a safe construction site by improving the poor working environment of workers and providing a stepping stone to protect the environment.

Prior to describing the embodiments of the invention for implementing the technical idea of the present application as examples, the terms or words used in the specification or claims of the present application should not be construed as being limited to a common or dictionary meaning, The protection scope of the present application should be interpreted as meaning and concept consistent with the technical spirit of the present invention, and the examples described in this specification are only one of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. , It should be understood that there may be various equivalents and modifications that can replace them at the time of this application.

Referring to an embodiment in which the present invention is implemented, the present invention improves the durability of a structure requiring a grouting injection material and chemical chemical reaction by high-speed stirring of aluminum salts and silicates according to the gel time. In the (a) solution preparation step for producing unstable colloidal silica for glauting, gelation occurs within 5 to 13 seconds in the case of purity (rapid crystallization) and within 50 to 90 seconds in the case of complete A water-soluble additive containing liquid sodium silicate and water or aluminum salt is injected while adjusting the inflow amount by the automatic fluid inflow control device, diluted to a uniform concentration by mixing liquid sodium silicate and water, and supplied with hydrogel. The step is to prepare an aqueous solution of colloidal silica containing an aluminum salt capable of retaining moisture in the grouting solid for a long time by supplying a hydrogel composition capable of preventing the leaching of water contained in the grouting solid body and forming a silica sol. The hydrogel required for this is also called a hydrogel, and water-soluble polymers can form three-dimensional crosslinks through physical (hydrogen bonds, van der Waals forces, hydrophobic interactions, or polymer crystals) or chemical (covalent bonds) bonds. As it has a network structure that is being formed, it is possible to prevent leaching of water present inside the grouting solid body, and the hydrogel for this is collagen, gelatin, fibrin, and alginic acid. There are natural polymers such as , hyaluronic acid and chitosan, and synthetic polymers such as poly(acrylic acid)-based polymers, copolymers with poly(ethylene oxide), poly(vinyl alcohol), and polyphosphazene. Dissolved in an aqueous solution of colloidal silica containing an aluminum salt at 1.0% by weight or less, preferably supplied as a composition for preventing dissolution.

In addition, in the present application, in the solution preparation step to achieve additional compression increase and gelation acceleration (purity) or delay (completeness), cement and additives for completion or rapid setting control are supplied in powder form by an automatic powder introduction device, and powder automatic The injection switch functions to supply or block cement or rapid setting control additives in powder form, and water or water-soluble additives are injected by adjusting the inflow amount by the automatic fluid inflow control device, selectively in the mixing step of solution type and cement additives. The grouting chemical solution mixing step in which the grouting composition is mixed with the silica sol aqueous solution prepared by the high permeability silica sol forming step, cement, and additives, and the grouting chemical mixture is poured into the ground. The grouting chemical liquid injection step for the underground grouting mixture, the gelation step in which the grouting mixed chemical liquid poured underground begins to harden into a certain shape by the generation of a three-dimensional large network, and the final solidification step in which hardening is started by the gelation step and a hardened body is formed completely It is applied in the form of a solution or provided as an opaque suspension grouting agent, and is applied to achieve purity and complete gel time according to site conditions, and the final grouting cured product can be applied to have high durability without leaching.

Looking in detail about the raw materials used as a detailed discussion for embodying the technical idea of the present application, when manufacturing chemically unstable colloidal silica so that the silica sol gel method can be performed for the gel time of the grouting composition, the following As shown in Chemical Scheme 1, strong acidic inorganic acids, such as sulfuric acid, which have a very high risk to the human body, can cause burns due to carelessness of workers, and can adversely affect water quality and soil environment. It is preferable to use colloidal silica for grouting that is chemically unstable by salt, and the colloidal silica produced by the present application has a size of 10 nanometers to 100 nm and contains 20% to 40% by weight in water. It is preferable to dilute and use the silica sol stock solution to an appropriate concentration according to the grouting method.

Na ₂ SiO ₃ + H ₂ SO ₄ (dangerous) + H ₂ O → Na ₂ SO ₄ + SiO ₂ (chemically unstable colloidal silica for grouting + 2H ₂ O------------- -[chemical reaction formula 1]

In the step of mixing colloidal silica and water containing 1.5 to 30% by weight of aluminum salt in the (A) liquid preparation step in which the colloidal silica is formed, the colloidal silica is pure (rapid; short) and completed (delayed: slow) ) It is preferable to dilute and mix all water or water-soluble additives at 30 to 110 parts by weight based on 100 parts by weight, more preferably 45 to 80 parts by weight is advantageously mixed, and most preferably 55 parts by weight It is advantageous to mix 65 parts by weight or 65 parts by weight of colloidal silica. Mixing less than 30 parts by weight of colloidal silica gives a mild effect, so it is not suitable for grouting injection materials that require purity. Although the purity effect appears, there is a problem that the construction cost may increase due to excessive mixing of the injection material, so it can be said that it is appropriate to mix at the concentration suggested above.

Therefore, the method applied herein requires chemically unstable colloidal silica for grouting in order for grouting agents to be poured underground to gel in the necessary time. As the liquid sodium silicate solution is supplied in the atmosphere of the inorganic acid solution, it can cause great harm to the human body and accelerate contamination of the soil environment due to carelessness of the worker during the high-speed stirring and mineral acid supply process, and can also accelerate the contamination of the soil environment. In order to solve the problem of durability of grouting, it is environmentally mild instead of mineral acid with very low pH, accelerates cement solidification time, promotes hydration reaction, and improves initial strength and compressive strength. It is characterized by the production of colloidal silica for grouting that is chemically unstable by aluminum salts that can improve the performance and used in the field of grouting.

In addition, the cement used herein as a suspension grouting injection material and selectively used in the grouting solution to form a high-strength grouting material can be selected from various types according to the shape or characteristics of the ground. Based on parts, 50 to 150 parts by weight can be diluted and used. In order to provide a suspension injection material for general ground reinforcement, it is advantageous to use Portland-based cement having a specific surface area of 3,000 to 3,500 cm ² /g, and to increase initial strength. In order to increase the specific surface area, high-strength Portland cement with a specific surface area of 4,000 to 4,600 cm ² /g or ultra-high-strength Portland cement with a specific surface area of about 6,000 or more cm ² /g is used. Portland cement, sulfate-resistant Portland cement to increase resistance to sulfate invasion, seawater resistance and chemical resistance while increasing long-term strength, blast furnace cement to minimize alkali and reactivity, reduce drying shrinkage, In order to increase the long-term strength while reducing the heat of hydration, fly ash cement can be used.

In order to provide a general grouting injection material, it is possible not to use a separate additive, but it is advantageous to mix additives to provide higher strength than a suspension grouting injection material used alone. At least one selected from powder, fly ash, fume silica, magnesium oxide, magnesium hydroxide, zinc oxide, aluminum oxide, potassium sulfate, calcium sulfate, calcium carbonate, and sodium borate 2.5 to 35 parts by weight may be added and used based on the weight of the cement, preferably 3.5 to 30 parts by weight is advantageously added, more preferably 5.0 to 30 parts by weight is advantageously included, and the most Preferably, it is advantageous to add 7.5 to 20 parts by weight. When the additive is added at a weight ratio of 2.5 or less to cement, the effect of improving the physical properties by the additive is not very high because the physical properties of the suspension used alone are similar. If more than one part by weight is added, since a relatively small amount of cement is included, there is a risk of strength deterioration, so it is advantageous to add the appropriate amount suggested above.

Water or water-soluble additives can be used to provide fluidity and homogeneity while diluting the cement or quick-finish control additive supplied from the powder automatic inlet device. Only water is used alone or carbonate or bicarbonate can be used by dissolving in water, and it is advantageous to prepare and add solution-type and suspension-type grouting injection materials according to the ground conditions and basic geological conditions of the place of use, and the carbonate or bicarbonate used at this time reacts with silica sol to form a gel time It works to regulate this.

In the present application, the water-soluble additive is selected from the group consisting of sodium carbonate, potassium carbonate, ammonium carbonate, sodium bicarbonate, potassium bicarbonate, ammonium bicarbonate, and glyoxal in an amount of 5 to 100 parts by weight based on 100 parts by weight of the silica sol in the preparation step of the solution (A). 80 parts by weight may be added, and in the case of a pure grouting injection material, it is advantageous to dissolve preferably 20 to 80 parts by weight, more preferably 30 to 65 parts by weight, and most preferably 35 to 60 parts by weight. Bar, when dissolved in less than 20 parts by weight, it reacts with the silica sol formed in the high permeability silica sol formation step and gelation occurs late, so it is not suitable for pure type. Since sodium bicarbonate has a low solubility, the probability of becoming insoluble is very high, so it is advantageous to dissolve the appropriate amount suggested above, and in the case of a complete form, it is advantageous to dissolve 5 to 20 parts by weight, more preferably 5.5 to 15 parts by weight. And, more preferably 7.0 to 13 parts by weight is advantageous, and most preferably 9.0 to 11 parts by weight is advantageous. When dissolved in 5 parts by weight or less, the effect of completion can be exhibited, but it is very difficult to control the gel-time , it is advantageous to dissolve the appropriate amount suggested above because there is a high probability of making a pure type grouting injection material when dissolving 20 parts by weight or more.

Hereinafter, an example to which the technical idea of the present application is applied will be described in detail by the following embodiments of the present invention.

Example 1 (suspension type pure type grouting injection material)

Based on 100 parts by weight of a solution in which 1.5% by weight of aluminum sulfate is dissolved [Youngjin Chemical Co., Ltd.], 15% by weight of 3 kinds of liquid sodium silicate [S-Chemtech Co., Ltd.] is supplied, and the aluminum sulfate solution is mixed with a mixer at high speed. While rotating, a liquid sodium silicate solution was slowly supplied to prepare a chemically unstable colloidal silica solution A for grouting containing aluminum sulfate.

Separately, 190 kg of cement and 10 kg of golo slag, a cement additive, were added, and 40 kg of sodium bicarbonate (Samjeon Pure Chemical Co., Ltd.), a water-soluble additive, was measured and mixed to prepare solution B, and solution A and B were mixed. As soon as the mixing step was performed, the gel time was confirmed, and the physical properties were confirmed after gelation.

Example 2 (solution-type pure grouting injection material)

Based on 100 parts by weight of a solution in which the solid content of aluminum sulfate is 7.5% by weight [Youngjin Chemical Co., Ltd.], 25% by weight of 3 types of liquid sodium silicate [S-Chemtech Co., Ltd.] is supplied, and the aluminum sulfate solution is mixed with a mixer at high speed. While rotating, a liquid sodium silicate solution was slowly supplied to prepare a chemically unstable colloidal silica solution A for grouting containing aluminum sulfate.

Separately, measure 40 kg of sodium bicarbonate (NaHCO ₃ , Samjeon Pure Chemical), fill it with the remaining water and dissolve to prepare 200 liters of B solution, and check the gel time as soon as the mixing step of mixing A solution and B solution is performed. After gelation, the physical properties were confirmed.

Example 3 (Suspension Type Complete Grouting Injection Material)

Based on 100 parts by weight of a solution [Youngjin Chemical Co., Ltd.] in which 20% by weight of solid content of aluminum sulfate is dissolved, 35% by weight of liquid potassium silicate [S-Chemtech Co., Ltd.] is supplied, while the aluminum sulfate solution is rotated at high speed with a mixer. A chemically unstable colloidal silica solution A for grouting containing aluminum sulfate was prepared by slowly supplying a liquid potassium silicate solution.

Separately, after measuring 40 kg of cement and 4 kg of sodium bicarbonate, water was supplied and mixed uniformly with a mixer to prepare 200 liters of solution B.

When the gel time was measured as soon as the mixing step of mixing the A solution and the B solution was performed, the physical properties were measured after gelation.

Example 4 (solution type finished grouting injection material)

Based on 100 parts by weight of a solution [Youngjin Chemical Co., Ltd.] in which 30% by weight of solid content of aluminum chloride is dissolved, 45% by weight of liquid potassium silicate [S-Chemtech Co., Ltd.] is supplied, while the aluminum sulfate solution is rotated at high speed with a mixer. A chemically unstable colloidal silica solution A for grouting containing aluminum chloride was prepared by slowly supplying a liquid potassium silicate solution.

Separately, 5 kg of sodium bicarbonate was measured, filled with the remaining water and dissolved to prepare 200 liters of solution B, and the gel time was measured immediately after the mixing step of mixing the solution A and solution B, and the physical properties were measured after gelation. .

Comparative Examples 1 to 4

When concentrated sulfuric acid (Samjeon Pure Chemical) is diluted with water, a very large exothermic reaction occurs, and a dilution step to lower the risk to the human body and a cooling step to lower the heat generated by the dilution are performed dozens of times to reduce the reaction to 70%. of sulfuric acid was prepared.

Performed in the same manner as in Examples 1 to 4, except that chemically unstable colloidal silica for grouting was prepared by supplying silicate as in Examples 1 to 4 while rotating the prepared 70% sulfuric acid solution with a mixer at high speed. did

In Comparative Examples 1 to 4 and Examples 1 to 4, the worker's risk [subject to XXCC grouting workers] was confirmed when manufacturing chemically unstable colloidal silica for grouting, and after 1 month After that, the compressive strength of the sandgel was checked.

Table 1 shows the results of Comparative Examples 1 to 4 and Examples 1 to 4.

division human body
war humility Gel time (seconds) Sandgel compressive strength (28 days)
(kg/cm ² ) Example 1 none at all 9.8 26-29 Example 2 none at all 9.2 not measurable Example 3 none at all 58 28-31 Example 4 none at all 54 not measurable Comparative Example 1 very high 9.4 19-22 Comparative Example 2 very high 9.6 not measurable Comparative Example 3 very high 56 19-22 Comparative Example 4 very high 57 not measurable

As shown in Table 1, in the case of Example 2, Example 4, Comparative Example 2, and Comparative Example 4, the sandgel compressive strength could not be measured because they were solution type, complete type, and pure type. The gel time of Examples 1 to 4 confirmed that there was no significant difference in providing the gel time of the grouting agent between colloidal silica prepared in an atmosphere of sulfuric acid and colloidal silica prepared in an atmosphere containing aluminum salt.

In preparing colloidal silica, which is essential for controlling the gel time of the grouting agent, when preparing colloidal silica by supplying silicate while stirring the sulfuric acid solution at high speed, as in Comparative Examples 1 to 4, sulfuric acid damages human tissue and However, as a corrosive substance that can be destroyed, severe exposure by inhalation, ingestion or topical application due to fatal inhalation damage by sulfuric acid vapor during the dilution process can lead to fatal results. Sulfuric acid is a strongly acidic liquid compound that reacts with water and is very As it has a property of generating high heat, it was confirmed that the risk to the human body is very high.

In addition, it was confirmed that the compressive strength of the sandgel (28 days) was 19 to 22 kg/cm ² .

On the other hand, in Examples 1 to 4, it was confirmed that there was no risk to the human body when the colloidal silica prepared in an atmosphere containing aluminum salt was produced, and the higher the concentration of the aluminum salt in the prepared colloidal silica solution, the more the sandgel was compressed. It was confirmed that the strength (28 days) greatly increased to 26~29 kg/cm ² .

Therefore, when producing conventional colloidal silica for grouting through the colloidal silica composition for grouting using the aluminum salt of the present invention and the construction method using the same, it is difficult to use strong acidic inorganic acids such as sulfuric acid that are very dangerous to the human body. According to the shape of the soft ground or the type of soil, it is possible to adjust the gel time of solution or suspension type grouting injection and complete gel time. Since it can provide a grouting composition, it is expected to be applied as a technology that can be widely used in the field of ground reinforcement as well as corporate competitiveness.

Claims (6)

In order to control the gel time of the grouting agent, a colloidal silica composition is obtained as an aluminum salt, and in the grouting application method using the same,
One aluminum salt (Aluminum salts) selected from aluminum sulfate (Al ₂ (SO ₄ ) ₃ or aluminum chloride (Aluminium chloride, AlCl ₃ ) is selected and dissolved in water at 1.5 to 30 wt%. prepare,
A solution b is prepared so that one type of silicate selected from liquid sodium silicate (Na ₂ SiO ₃ ) or potassium silicate (K ₂ SiO ₃ ) is dissolved in water at 15 to 45 wt%,
A first method for obtaining a colloidal silica solution while controlling the inflow amount of a water-soluble additive and a hydrogel by an automatic fluid inflow control device when aluminum salt solution a and silicate b solution are mixed in an agitation reaction tank having an agitation speed of 250 to 3,000 rpm. step process,
In the step of preparing a grouting solution for increasing strength and controlling rapid setting or completeness, cement and additives for rapid setting or completeness control are supplied in quantitative quantities by an automatic powder inflow control device to obtain a suspension composition;
The colloidal silica solution obtained in the first step process and the suspension composition obtained in the second step process are uniformly mixed to obtain a grouting mixture, and the grouting mixture is introduced into the ground to form a three-dimensional network and hardens. A method of applying a colloidal silica composition for grouting, characterized in that it comprises a gelation process and a third step of curing and obtaining a complete cured product. According to claim 1,
The water-soluble additive used in the first step process is at least one selected from sodium carbonate, potassium carbonate, ammonium carbonate, sodium bicarbonate, potassium bicarbonate, ammonium bicarbonate, and glyoxal, and based on 100 parts by weight of silicate, 5 to A method of applying a colloidal silica composition for grouting, characterized in that it is applied so as to contain 80 parts by weight. According to claim 1,
The additives used in the second step process for controlling rapid quenching or completion are bentonite, blast furnace slag powder, fly ash, fume silica, magnesium oxide, magnesium hydroxide, zinc oxide, aluminum oxide, potassium sulfate Of the colloidal silica composition for grouting, characterized in that at least one selected from among calcium sulfate, calcium carbonate, and sodium borate is added in the range of 2.5 to 35.0 parts by weight based on 100 parts by weight of cement. construction method. According to claim 1,
The cement used in the second step process is ordinary Portland cement belonging to Portland cement, medium heat Portland cement, early strong Portland cement, sulfate-resistant Portland cement, white Portland cement, oil well cement, colloidal cement or blast furnace cement belonging to mixed cement, At least one type of cement is selected from Fly ash cement, silica cement, ultra-low heating cement, geothermal well cement, RCCP cement, alumina cement, ultra-quick setting cement, and GRC low-alkali cement, and 50 to 150 based on 100 parts by weight of water A method of applying a colloidal silica composition for grouting, characterized in that it is used after being diluted in parts by weight. According to claim 1,
The method of applying the colloidal silica composition for grouting, characterized in that the colloidal silica solution used in the first step process has a size of 10 to 100 nm and is applied to contain 20 to 40% by weight in water. According to claim 1,
The hydrogel used in the first step process is collagen, gelatin, fibrin, alginic acid, hyaluronic acid, chitosan, polyacrylic acid ), polyethylene oxide, polyvinyl alcohol, and polyphosphazene, and at least one hydrogel is selected, and included in an aqueous colloidal silica solution containing aluminum salt at an amount of 1.0% or less by weight. A construction method of a colloidal silica composition for grouting, characterized in that it is applied.