KR920002994B1 - Dry grouting agent and method of producing same - Google Patents

Abstract

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Description

Dry grouting agent and preparation method thereof

The present invention relates to a dry grouting agent that grouts (injects with pressure) a soft rock infiltrated with water to change the ground into a property that does not penetrate water, and a method for producing the same.

The particle size of particles injected under pressure into the soft rock by the dry grouting method should be such that it can penetrate into the air blown together in the gap (30-40μ) of the 10 cm thick sand layer by standard sand of 100-300μ particle size. It is.

For this reason, Japanese Unexamined Patent Publication No. 60-211417 discloses blowing ultra-fine cement having an average particle diameter of 4 mu or less.

However, even though cement is such a fine particle, the surface is rough and difficult to flow smoothly, which makes it difficult to penetrate deeply into the cracks of the rock, and at the same time, strong wind pressure is required to blow it.

Accordingly, the dry grouting agent includes cement particles having a particle diameter of 10 µm or less, preferably 2-7 µm, and needs to have a hydrophilic property that smoothly flows on the surface and thus bonds well with water.

An object of the present invention is to provide a grouting agent capable of constructing a wall having excellent permeability and high waterproofing effect as compared with the conventional ultra-fine particle cement, and a method of manufacturing the same.

In order to achieve the above object, the dry grouting agent of the present invention is formed by baking a coating layer containing a water-soluble silicone resin and a surfactant on the surface of cement particles having an average particle diameter of 10 µm or less, preferably 2-7 µm.

In addition, the production method is a mixture of a water-soluble silicone resin, a surfactant, and an oily solvent to the cement particles having an average particle diameter of 2-7μ, evenly kneaded, and then heated to evaporate the oily solvent and water, and dried by drying, It is formed by grinding after cooling.

As mentioned above, in the dry grouting agent which concerns on this invention, the water-soluble silicone resin in the coating layer baked on the surface of cement microparticles makes a coating layer glassy, and it slips easily, As a result, it is excellent in permeability and surfactant. When the water is injected, the layer is hydrophilized to absorb moisture gradually into the layer to maintain moisture.The particles of the dry grouting agent are entangled with each other by the cement particles inside to solidify into a lump to provide a high waterproofing wall. To build.

Other objects and features of this invention are described in detail below.

As mentioned above, the dry grouting agent must have a particle diameter of 10 μm or less to reliably penetrate into a small gap, to enclose the cement particles, to make the surface slippery, and to allow individual particles to become entangled when water is injected. It is preferable to have hydrophilicity.

Therefore, the inventors have found that by injecting water, the particles are chemically reacted to provide a coating layer containing a water-soluble silicone resin and a surfactant on the surface of each of the fine particles of cement, which are entangled in a mass. It was found that the coating is easily slipped, and when it meets with water, the water is gradually absorbed by the surfactant and the cement particles inside are entangled with each other to harden to form a wall having high waterproof effect.

As the water-soluble silicone resin in which the glassy material of this invention forms a coating layer, methyltrimethoxysilane and methyltriethoxysilane called sodium dimethylsiliconate, sodium trimethylsiliconate, these polymers, and other silane coupling agents other than general sodium methylsiliconate Furthermore, polyethylen | denatured dimethylsiloxane and other not limited to this, Any water-soluble silicone resin can be used. Moreover, the oil-based silicone resin is not preferable because the coating layer formed easily becomes rubbery and has no sliding property. The amount of the silicone resin used is about 0.2-20 parts relative to cement.

In addition, surfactants are anionic, cationic, nonionic, and amphoteric, and any of them may be used, and not only one but also two or more may be used in combination.

This amount is determined depending on the thickness of the layer coating the cement particles and the degree of hydrophilization of the coating layer, but it is about 0.01-10 parts with respect to the cement.

Moreover, since cement is strongly alkaline, ester-type surfactants containing organic acids, phosphoric acid, and the like may lose their effects due to hydrolysis. The thickness of the coating layer is about 1-100 nanometers.

Since a dry grouting agent is prepared by setting such a coating layer on the surface of the cement particles, when a water-soluble silicone resin and a surfactant are mixed with water and added to the cement particles, the particles of each cement harden and coagulate with each other by moisture.

For this reason, in this invention, water-soluble silicone resin and surfactant are mixed using an oil-based solvent as a solvent, and it adds and mixes to the particle | grains of cement.

Usable oily solvents include alcohols of lower alcohols such as methanol, ethanol, propanol, tert-butanol, sulfones such as dimethyl sulfoxide, and amides of dimethylformamide, and any of them can be mixed uniformly with a water-soluble silicone resin solution. Any good.

Water-soluble silicone resins are often in the form of sodium salts, and in the case of using solvents, they do not dissolve in them, but are often precipitated by the addition of solvents. Therefore, the amount of solvent used may be appropriately determined and evenly mixed with the silicone resin. Do not allow precipitates to form.

In addition, since the solubility of the silicone resin decreases as the carbon number of the oil-based solvent is increased, the carbon number is preferably as low as possible.

As an oil-based solvent used in this sense, methanol which is excellent in terms of economics and solubility in water-soluble silicone resins, has a low boiling point, and is easily separated and recovered, is optimal. Moreover, the amount of oil-based solvent is 1-50 parts with respect to cement.

The liquid mixture of the water-soluble silicone resin and surfactant which used the above-mentioned oil-based solvent as a solvent is added with cement particles having a particle diameter of 10 µm or less, preferably 2-7 µm. As an addition method, it sprays and mixes with a cement particle.

The cement particles coated with the mixed solution are heated to a temperature of 100 ° C. or lower in a sealed container to remove moisture from the oil solvent and the water-soluble silicone resin and dried.

Next, the heating temperature is maintained at about 100 ° C to polycondense the water-soluble silicone resin on the surface of the cement particles to form a smooth coating layer on the surface.

The cement particles thus treated are adhered to each other, and after cooling, the individual cement particles coated with glass are pulverized with a suitable grinder such as a ball mill or an impact high-speed crusher, and a dry particle having a particle size almost the same as that of the starting material is dried. A grouting agent can be obtained.

The dry grouting agent blown into the air in the soft rock according to the present invention prepared as described above is easily slippery because the surface is coated with glass, and is excellent in permeability, which is not comparable to conventional ultrafine cement. To build a wall with high waterproof effect.

Next, examples of the present invention will be described, but the present invention is not limited to the following examples.

Example 1

10 parts of methanol as an oil solvent and 10 parts of methyl methyl silicate as a water-soluble solvent while stirring 100 parts of commercially available MC cement (Japan, ultrafine particle injector made by Onoda Cement, Allofix MC) with an average particle diameter of 2-7 μm After spraying 5 parts of Toray Silicone dry seal C) and 0.05 parts of surfactant (Japan, Toho Chemical Pegol ST-7, polyester type) in the form of a mist, the mixture was uniformly mixed for about 30 minutes. Subsequently, it is heated to 60-70 ° C. in a sealed container to evacuate and recover a small amount of water from methanol and water-soluble silicone resin by vacuum suction, dry the cement particles, and again raise the heating temperature to 100 ° C. The heat treatment was carried out for 1 hour to polycondensate the water-soluble silicone resin to complete the paste coating on the cement particles. After cooling, the cement particles were taken out of the container and pulverized into individual cement particles with a ball mill to obtain a grouting agent having a particle diameter of 2-7 μm with a glass surface.

Example 2

While stirring 100 parts of MC cement like Example 1, 20 parts of dimethyl sulfoxide as an oil-based solvent, 1 part of water-soluble silicone resin like Example 1, and surfactant (Japan, Neugen EA 50 made by Daiichi Kogyo Seiyaku, polyester) Type) 0.2 parts of a mixed liquid is sprayed into a mist, and then mixed uniformly for about 30 minutes, and then heated to 90-100 ° C. in a sealed container, and dimethyl sulfoxide and a small amount of water are discharged out of the device by vacuum absorption. After recovering and drying the cement particles, the water-soluble silicone resin was polycondensed by heat treatment for about 1 hour while maintaining the heating temperature at 100 ° C. to complete the paste coating on the cement particles. After cooling, the cement particles were taken out of the container and pulverized into individual cement particles by a high-speed grinding machine to obtain a grouting agent having a fine powdery powdery surface.

Quality test:

In order to evaluate the performance of the product, the following comparison tests were conducted using the grouting agents of Examples 1 and 2 and raw MC cement used as raw materials thereof as samples.

(1) Penetration depth test into rock

A particle diameter of 100-300μ is filled in a pressure-resistant glass tube with a diameter of 100mm and a height of 100mm, modeled as soft rock sand, and 10g of each sample is burned in air for about 1 minute using a table feeder. Blowed into the sand layer respectively. The air volume is 1 Nm ³ / min and the pressure 1-6 Kg / cm.

(2) sedimentation test

A beaker of a capacity of 100 ml and a height of 70 mm was filled with about 8 parts of water, and 2 g of each sample was sprayed on the surface of the water, and the time until the whole amount settled on the bottom was measured while gently shaking.

(3) coagulation test

20 g of each sample was put in a petri dish, and 10 ml of water was added little by little, mixed sufficiently, left to observe, and the time until the plastic change disappeared was stabbed with a glass stick.

(4) Permeability coefficient

In the test of (1), water is injected into the model sand layer into which each sample is blown with 1-2 m of water column, and cured under water for 1 to 3 weeks until it aggregates, and after condensation, a water pressure of 2 m of water column is applied to determine the permeability coefficient. Measured.

(5) slip test

Shear stress was measured using a powder bed tester (PTH type, manufactured by Sangkyodenkyo Co., Ltd., Japan). Shear area is 35cm², Preload density is 29.71 g / cm², Shearing speed was performed at 62 mm / min.

The test results are shown in the following table.

As is clear from the above results, the grouting agents according to Examples 1 and 2 permeate to the bottom without difficulty, while the MC cement strip is hardly penetrated into the model sand layer having a layer thickness of 100 mm. This was demonstrated by the fact that the value of the shear stress of the grouting agents of Examples 1 and 2 was lower than that of MC cement, and the degree of slipping was large.

Furthermore, the shear stress value of the grouting agent of Example 1 is smaller than that of the grouting agent of Example 2, and the slip state is better, and the settling time and the settling time of the grouting agent of Example 1 are longer than those of the water-soluble silicone resin. The amount of use is 5 times higher than that of Example 2, and conversely, the amount of surfactant is low, which is attributable to high water repellency. For this reason, the grouting agent of Example 1 is suitable for solidifying in the deep layer of rock, and the grouting agent of Example 2 is suitable for solidifying in the shallow layer of rock.

Moreover, the permeability coefficient of the products of Examples 1 and 2 is 10 ^-5 or more, and the MC barrier alone hardly penetrates into the model sand layer, and the degree of slipping is sufficient for constructing a water barrier wall with sufficient effect. Is due to less.

Claims (11)

The dry grouting agent formed by baking to the surface of a cement particle in the coating layer containing water-soluble silicone resin and surfactant. The dry grouting agent according to claim 1, wherein the coating layer has a thickness of 1-100 nanometers. A method for producing a dry grouting agent, which is obtained by adding a mixture of a water-soluble silicone resin, a surfactant, and an oily solvent to a cement particle, mixing the same, and heating to evaporate, dry, and paste the oily solvent and water, followed by crushing after cooling. The method for producing a dry grouting agent according to claim 3, wherein the particle size of the cement particles is in the range of 2-7 µm. The method for producing a dry grouting agent according to claim 3, wherein the amount of the water-soluble silicone resin added is 0.2-20 parts with respect to the cement. The method for producing a dry grouting agent according to claim 3, wherein the amount of the surfactant added is 0.01-10 parts with respect to cement. The method for producing a dry grouting agent according to claim 3, wherein the amount of the oily solvent added is 1-50 parts based on the cement. The method for producing a dry grouting agent according to claim 7, wherein the oily solvent is methanol. The method for producing a dry grouting agent according to claim 3, wherein the cement particles to which the mixed solution is added are heated at a temperature of 60-100 ° C. to evaporate the oily solution. The method for producing a dry grouting agent according to claim 3, wherein the cement particles are heated to a temperature of 100 DEG C to crush the silicone resin on its surface to make it glassy. The method for producing a dry grouting agent according to claim 3, comprising grinding the cement particles which have been baked and treated with a grinder.