KR102553874B1 - Manufacturing method of eco-friendly grout in silica-sol state using safe material and grouting method using the same for water blocking - Google Patents

Abstract

The present invention relates to a method for manufacturing an eco-friendly grout material in a silica-sol phase using a safe material and a water order grouting construction method using the same. (S10) preparing chemical liquid A in a silica-sol state to improve bonding strength with general cement by adding process water to (Na ₂ SiO ₃ ) (S10), (b) mixing Portland cement with a compressive strength reinforcing agent for water-blocking walls Preparing a compressive strength enhancing cement capable of improving the compressive strength (S20), (c) preparing a powder type B medicine by mixing a gel-time regulator with the compressive strength enhancing cement prepared in step S20 Step (S30), (d) mixing and stirring process water with the powdered medicine B prepared in step S30 to prepare a liquid B liquid medicine (S40), (e) silica-sol prepared in step S10 A step of mixing the liquid A liquid and the fluid liquid B prepared in step S40, wherein the sodium silicate used in step S10 has a specific gravity of 1.383 and silicon dioxide (SiO ₂ ) in a mass ratio of 28 to 38% , sodium oxide (Na ₂ O) is included in a mass ratio of 9 to 10%, the content of iron (Fe) is 0.02% or less, and the water insoluble content is 0.2% or less.

Description

Silica-sol phase eco-friendly grout material manufacturing method using safe material and water order grouting construction method using the same

The present invention relates to a method for manufacturing an eco-friendly grout material in a silica-sol phase using a safe material and a water order grouting construction method using the same. Therefore, by using safe materials instead of hazardous materials such as hydrochloric acid, workers can perform grouting work safely and conveniently in the field, reduce the amount of sodium silicate used, and save grout material manufacturing costs. It relates to a method of manufacturing an eco-friendly grout material capable of preventing corrosion and minimizing contamination of groundwater, and a method of constructing water-repellent grouting using the same.

When constructing buildings or civil engineering works on the ground or underground, there are cases in which groundwater is flowing or water is stagnant in the ground.

In this case, the construction is performed after forming the water order wall first, which is commonly referred to as water order grouting construction.

In addition, the injection material used for water-level grouting construction is called grout or grout material.

Here, when the grout material has chemical properties, it is referred to as a chemical solution.

On the other hand, in the case of silica-based grout materials, they are called neutral grout materials or non-alkaline grout materials because they are gelated in the neutral range (pH 5.8 to 8.6).

A grout material commonly used in a low-pressure injection type grouting method is composed of liquid A and liquid B, which can be supplied by a pump.

Sodium silicate is used as the main component of the chemical solution A, and cement is widely used as the main component of the chemical solution B.

Liquid A and liquid B are not solidified when they exist independently, but are completely solidified when the gel time of each grout material elapses after liquid A and liquid B are mixed.

Using these characteristics, it is possible to form a water-blocking wall that blocks groundwater flowing or stagnant in the ground.

Among the order grouting methods, there is the S.G.R (Space Grouting Rocket System) method that allows the gel-time to be adjusted.

In the S.G.R grouting method, as shown in [Table 1] below, about half of the chemical solution A is used to produce 1 m3 of grout material.

Injection material mixing ratio of S.G.R grouting method A liquid (500ℓ) B liquid (500ℓ) sodium silicate 250ℓ quick payment final payment cement 150kg cement 150kg SGR (No. 7) 60kg SGR (No. 8) 60kg water 250ℓ water 420ℓ water 420ℓ

Sodium silicate, the main component of the chemical liquid A, is obtained by dissolving silicic acid or the like into sodium carbonate (Na ₂ CO ₃ ) or sodium hydroxide (NaOH), and is generally supplied in a starch syrup state (sol state) by heating and dissolving sodium silicate in water. In addition, it is supplied as crystals of white powder, such as sodium metasilicate.

[Table 2] below shows the types of sodium silicate and their characteristics.

Types and characteristics of sodium silicate division 1 type 2 types 3 types sodium metasilicate 1 type 2 types Exterior Colorless or liquid colored liquid in starch state White powder or granular state white crystal Specific Gravity (15℃) - 1.598(54) 1.383(40) - Silicon dioxide (SiO ₂ ) (%) 35-38 34-36 28-38 27.5-29 19-22 Sodium oxide (Na ₂ O) (%) 17-19 14-15 9-10 28.5 to 30 20-22 Iron (Fe) (%) 0.03 or less 0.03 or less 0.02 or less - - Water insoluble content (%) 0.2 or less 0.2 or less 0.2 or less - -

The sodium silicate (Sodium Silicate), sodium oxide and silicic anhydride are combined in various ratios, the molecular formula is Na ₂ O nSiO ₂ (n: molar ratio), silicic acid (SiO ₂ ) and alkali (Na ₂ O) It is classified into 1 type, 2 types, and 3 types by the molar ratio (n) of

The sodium silicate reacts as in [Formula 1] and [Formula 2] below in an aqueous solution, and the chemical reaction of the colloid is as in [Formula 3].

Activated silicic acid made by reacting sodium silicate (three types) with the above characteristics with acidic liquid, that is, the reaction formula in which active silicate reacts with an acidic substance is shown in [Formula 4] below, and the chemical reaction of colloid is as in [Formula 5] same.

As described above, sodium silicate (Na ₂ SiO ₃ , 3 types) is mainly used when preparing chemical solution A of the grout material used in the low-pressure injection grouting method, and cement is mainly used when preparing chemical solution B.

On the other hand, the gel-time must be very short in order for the liquid A and liquid B to be injected into the ground with groundwater and solidified. For this purpose, strong acids such as hydrochloric acid are usually used.

However, acid-based substances such as hydrochloric acid are very dangerous substances, and there is a problem in that they damage the skin or clothing of workers and corrode the grout material injection device.

In addition, the grout material, which uses sodium silicate as the main raw material, causes desorption over time after being injected into the ground.

Among the problems caused by the separation phenomenon, there is a volume reduction phenomenon. When the volume of the injection material injected into the ground is reduced, an empty space is created, and secondary problems such as sinkholes may occur. .

In addition, when the desorption phenomenon occurs, there is a problem that heavy metals contained in the raw material of the injection material contaminate groundwater.

The present invention is to solve the problems of the prior art, and an object of the present invention is to enable the production of an environmentally friendly grout material by using safe materials without using strong acidic materials such as hydrochloric acid when preparing chemical solution A.

Another object of the present invention is to enable workers to work in a safe environment by using a safe material without using a strongly acidic material when preparing chemical solution A.

Another object of the present invention is to prevent grouting equipment from being corroded or damaged by the use of a strong acidic material and to minimize contamination of groundwater.

Another object of the present invention is to reduce the manufacturing cost of the grout material by reducing the amount of sodium silicate used, and to minimize the phenomenon of volume reduction after injection into the ground.

Another object of the present invention is to improve the compressive strength of the order wall and to freely adjust the gel-time of the injection material in the field.

In order to achieve the above object, the method for manufacturing a grout material according to the present invention includes (a) sodium silicate (Na ₂ SiO ₃ ) by adding process water to improve bonding strength with Portland cement; Preparing a chemical liquid (S10), (b) preparing a compressive strength reinforcing cement capable of improving the compressive strength of a barrier wall by mixing Portland cement with a compressive strength reinforcing agent (S20), (c) in the above S20 step. Preparing a powder type B medicine by mixing the gel-time regulator with the prepared cement for compressive strength reinforcement (S30), (d) mixing and stirring process water with the powder type B medicine prepared in step S30, so as to achieve fluidity B preparing a chemical solution (S40), (e) mixing the silica-sol state liquid A prepared in step S10 with the liquid liquid B prepared in step S40, and silicic acid used in step S10 Sodium has a specific gravity of 1.383, silicon dioxide (SiO ₂ ) is 28 to 38% in mass ratio, sodium oxide (Na ₂ O) is included in 9 to 10% in mass ratio, and the content of iron (Fe) is 0.02% or less , It is characterized in that the water insoluble content that is not soluble in water is 0.2% or less.

In addition, in the step S10, the mixing ratio of the sodium silicate and the process water is characterized in that the volume ratio is 1: 2 to 1: 2.5.

In addition, in the step S20, the compressive strength enhancer is characterized in that any one or two or more of phosphate gypsum, flue gas desulfurization gypsum, titanium gypsum, and fluorine gypsum are used as byproduct gypsum.

In addition, in the step S20, the mixing ratio of the Portland cement and the compressive strength reinforcing agent is characterized in that the weight ratio is 1: 0.07 to 1: 0.3.

In addition, in step S30, the gel-time regulator is anhydrous gypsum, calcium sulfate dihydrate (CaSO ₄ 2H ₂ O), glauberite (Na ₂ SO ₄ CaSO ₄ ), potassium calcium sulfate (Potassium Calcium Sulfate : K ₂ Ca(SO ₄ ) ₂ ), calcium hydrogensulfate (Ca(HSO ₄ ) ₂ ), sodium calcium sulfate (Sodium Calcium Sulfate: Na ₂ Ca(SO ₄ ) ₂ ) any one or two or more characterized by use.

In addition, in step S30, the mixing ratio of the compressive strength reinforcing cement and the gel-time regulator is 1: 0.03 to 1: 0.15 in weight ratio.

In addition, in the step S40, the mixing ratio of the powdered medicine B and the number of steps is characterized in that the weight ratio is 1: 1.5 to 1: 2.5.

In addition, the order grouting construction method according to the present invention includes: (f) supplying the chemical solution A in a silica-sol state prepared in step S10 to the injection pipe of the chemical solution A of the low pressure injection type order grouting injection device by a first injection pump; , (g) supplying the fluid B chemical solution prepared in step S40 to the B chemical solution injection pipe of the low-pressure injection type order grouting injection device by a second injection pump, (h) the A chemical solution injection pipe and the B chemical solution injection pipe A step of mixing the silica-sol state liquid A and the liquid liquid B in the tip device that is collected in one place to prepare a silica-gel state (S50), (i) A mixed silica-sol state A in the tip device A step (S60) of supplying the liquid chemical and the liquid chemical liquid B into the ground while reacting instantaneously so that the injection material is solidified after the gel-time elapses (S60), while maintaining a constant distance between the injection material injection ports It is characterized in that it comprises a step (S70) of forming a cylindrical order wall with a diameter of 600 ~ 800 mm by injecting, and further forming an order wall at the rear to perform order grouting construction of a double wall.

In addition, the mixing ratio of the silica-sol state liquid drug A and the fluid liquid liquid B is characterized in that the volume ratio is 1:1.

According to the present invention, when preparing chemical solution A, strong acid substances such as hydrochloric acid are not used, and process water is mixed and stirred to prepare sodium silicate as a purer sodium silicate aqueous solution.

As a result, there is an effect that a safe and environmentally friendly grout material can be manufactured by turning the liquid A into a pure silica sol state.

In addition, since strong acidic substances are not used when preparing chemical solution A, there is an effect of enabling workers to perform grouting work in a safe environment.

In addition, since strong acidic substances are not used, it has an effect of preventing corrosion or damage of grouting equipment.

In addition, after the grout material is injected into the ground, contamination of groundwater can be minimized, and sinkholes can be prevented from being formed due to volume reduction.

In addition, since the amount of expensive sodium silicate used can be reduced, the manufacturing cost of the grout material can be reduced.

In addition, it is possible to improve the compressive strength of the order wall, and there is an effect of freely adjusting the gel-time of the injection material in the field.

1 is a flow chart showing a grout material manufacturing process and construction process according to the present invention.
Figure 2 is a compressive strength test photograph of a grout material test piece according to the present invention.
3 is a photograph showing a grout material mold manufactured according to the present invention.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

<Preparation of chemical solution A in silica-sol state>

As shown in FIG. 1, the method for preparing chemical solution A according to the present invention is a silica-sol state in which process water is added to sodium silicate (Na ₂ SiO ₃ , No. 3) to improve bonding strength with Portland cement. A chemical solution is prepared (S10).

Here, the sodium silicate has a specific gravity of 1.383, silicon dioxide (SiO ₂ ) is 28 to 38% in mass ratio, sodium oxide (Na ₂ O) is included in 9 to 10% in mass ratio, and the iron (Fe) content is 0.02 % or less, and the water insoluble content that is insoluble in water is preferably 0.2% or less.

And the mixing ratio of the sodium silicate and process water is preferably 1: 2 to 1: 2.5 in terms of volume ratio.

Here, when the mixing ratio of sodium silicate (Na ₂ SiO ₃ , No. 3) and process water is less than 1: 2, the amount of process water decreases and the concentration of sodium silicate aqueous solution increases, and the reactivity with chemical solution B decreases.

On the other hand, if the mixing ratio of sodium silicate (Na ₂ SiO ₃ , No. 3) and process water is greater than 1: 2.5, the amount of sodium silicate (Na ₂ SiO ₃ , No. 3) is reduced, so solidification is not achieved when reacting with liquid B. It is delayed and the gel-time becomes longer.

The reaction formula between sodium silicate and process water when preparing chemical solution A is as shown in [Formula 6] below.

Currently, as a low-pressure injection type grouting method, a representative method capable of controlling gel-time is the S.G.R (Space Grouting Rocket System) method.

The S.G.R. According to the construction method, sodium silicate occupies 250 liters of 500 liters of chemical liquid A when producing chemical liquid A (500 ℓ) and liquid chemical B (500 ℓ) based on 1 ㎥ of grout material.

On the other hand, according to the A.S.G (Activated Silicate Grouting) grouting method, 225 L of sodium silicate is required when producing 500 L of liquid A when producing 1 m3 of grout material.

On the other hand, in the present invention, when producing 1 m3 of grout material, 150 L of sodium silicate is required when producing 500 L of liquid A.

That is, in the present invention, only 60% of the sodium silicate used in the conventional S.G.R method and 66.7% of the sodium silicate used in the A.S.G method can be used. [Table 3] below shows this.

Comparison of sodium silicate consumption of the S.G.R method, the A.S.G method and the present invention division S.G.R method A.S.G method the present invention Sodium silicate consumption
(ℓ) 250 225 150 comparison(%) 100 (standard) 90 60 111 100 (standard) 66.7

As can be seen from the above [Table 3], according to the present invention, the amount of expensive sodium silicate can be greatly reduced. Accordingly, the manufacturing cost of the grout material can be significantly reduced.

In addition, it is possible to minimize groundwater contamination and volume reduction caused by the use of sodium silicate.

<Preparation of Liquid B Chemical Solution>

As shown in FIG. 1, the liquid B chemical solution according to the present invention, (b) preparing a compressive strength reinforcing cement capable of improving the compressive strength of a water order wall by mixing a compressive strength reinforcing agent with Portland cement (S20) , (c) mixing the gel-time regulator with the compressive strength enhancing cement prepared in step S20 to prepare powdered B medicine (S30), (d) process for powdered B medicine prepared in step S30 It comprises a step (S40) of preparing a fluid B liquid by mixing and stirring water.

That is, in the present invention, when preparing liquid B, first, a compression-reinforced cement is prepared, a powdery liquid B is prepared, and then a fluid B liquid is prepared.

In step S20, Portland cement, the main component of chemical solution B, is mixed with sodium silicate (Na ₂ SiO ₃ , 3 types), which is the main component of chemical solution A, and reacts. After the injection material is injected, the compressive strength is weakened, and the gel- time gets longer

In order to compensate for this phenomenon, compression reinforced cement is prepared by mixing Portland cement with a compressive strength enhancer (S20).

The compressive strength reinforcing agent is by-product gypsum, and any one or two or more of phosphate gypsum, flue gas desulfurization gypsum, titanium gypsum, and fluorine gypsum may be used.

The phosphate gypsum refers to a gypsum material produced and precipitated as a by-product when phosphoric acid is produced by treating phosphate stone, which is a raw material of phosphate fertilizer, with sulfuric acid.

In addition, flue gas desulfurization gypsum (intestinal gypsum) refers to a gypsum material produced when sulfur dioxide among exhaust gases from thermal power plants is neutralized with milk of lime.

In addition, titanium gypsum is a by-product produced from a titanium oxide manufacturing plant, and fluorinated gypsum is a by-product from a hydrofluoric acid manufacturing plant.

In addition, in step S20, the mixing ratio of the Portland cement and the compressive strength enhancer is preferably 1:0.07 to 1:0.3 in terms of weight ratio.

When the mixing ratio of the Portland cement and the compressive strength enhancer is less than 1:0.07 in terms of weight ratio, the amount of the compressive strength enhancer is reduced and solidification occurs when reacting with sodium silicate (Na ₂ SiO ₃ , 3 types), which is the main component of liquid A. It doesn't happen.

As a result, it is easy to cause a phenomenon in which the compressive strength is weakened after injecting the injection material into the ground.

In addition, when the mixing ratio of Portland cement and the compressive strength enhancer is greater than 1:0.3 in terms of weight ratio, the reaction is too fast, and the compressive strength is rather weakened.

When the preparation of the compression-reinforced cement is completed, a gel-time regulator is added thereto to prepare a powdered medicine B (S30).

The gel-time regulator is anhydrous gypsum, calcium sulfate dihydrate (CaSO ₄ 2H ₂ O), glauberite (Na ₂ SO _{4 ∙} CaSO ₄ ), potassium calcium sulfate (Potassium Calcium Sulfate: K ₂ Ca (SO ₄ ) ₂ ), calcium hydrogen sulfate (Ca(HSO ₄ ) ₂ ), and sodium calcium sulfate (Sodium Calcium Sulfate: Na ₂ Ca (SO ₄ ) ₂ ), any one or two or more may be used.

Here, the mixing ratio of the compressive strength reinforcing cement and the gel-time regulator is preferably 1:0.03 to 1:0.15 in terms of weight ratio.

If the mixing ratio of the compressive strength reinforcing cement and the gel-time regulator is less than 1:0.03 in terms of weight ratio, the amount of the gel-time regulator becomes insufficient, so the gel-time becomes longer and the desired gel-time cannot be obtained.

On the other hand, if the mixing ratio of the compressive strength reinforcing cement and the gel-time regulator is greater than 1:0.15 in terms of weight ratio, the gel-time regulator is excessively mixed, resulting in an excessively short gel-time.

The reaction formula of step S30 is shown in [Formula 7] below.

When the preparation of the powdered medicine B is completed, a liquid B liquid is prepared by mixing process water therein (S40).

Here, the mixing ratio of the powdered medicine B and the process water is preferably 1: 1.5 to 1: 2.5 in weight ratio.

If the mixing ratio of the powdered medicine B and the process water is less than 1: 1.5 in terms of weight ratio, the amount of process water is insufficient and the fluidity decreases, the load on the injection pump increases, and the reaction with the drug solution A slows down, resulting in gel- The time also becomes longer than the design value.

On the other hand, if the mixing ratio of the powdered medicine B and the process water is greater than 1: 2.5 in terms of weight ratio, the fluidity is improved, but the solidification does not occur well, and the compressive strength is greatly reduced.

When the production of the fluid liquid B is completed, it is mixed with the silica-sol liquid liquid A to prepare an eco-friendly grout material.

<Order grouting construction method>

As shown in FIG. 1, the order grouting construction method according to the present invention, (f) A chemical solution in a silica-sol state prepared in step S10 is applied by a first injection pump to the low pressure injection type order grouting injection device A Supplying the liquid chemical solution to the chemical solution injection pipe, (g) supplying the fluid B chemical solution prepared in step S40 to the chemical solution injection pipe of the low-pressure injection type reorder grouting injection device by a second injection pump, (h) the chemical solution A Mixing the silica-sol state A chemical liquid and the fluid B chemical liquid in a tip device in which the injection pipe and B chemical solution injection pipe are brought together to form a silica-gel state (S50), (i) mixing in the tip device A step (S60) of supplying the silica-sol state chemical solution A and the liquid chemical solution B into the ground while reacting instantaneously so that the injection material is solidified after the gel-time elapses (S60), (j) the distance between the injection material injection ports is constant while continuously injecting grout material to form a cylindrical order wall having a diameter of 600 to 800 mm, and further forming an order wall at the rear to perform order grouting of a double wall (S70).

Here, the mixing ratio of the silica-sol state liquid drug A and the fluid liquid liquid B is preferably 1:1 in terms of volume ratio.

The reaction formula in which ettringite is formed and solidified at the same time in step S60 is shown in [Formula 8] below.

Hereinafter, experimental results of the grout material prepared according to the present invention and comparative examples will be described.

<Example 1>

Sodium silicate (3 types) and process water were mixed at a mass ratio of 27.7 : 46.7 to prepare an aqueous solution of sodium silicate, silica-sol state A.

And Portland cement and flue gas desulfurization gypsum were mixed at a weight ratio of 26.7 : 3.3 to prepare cement for strength reinforcement.

Then, the strength-enhancing cement and calcium sulfate (CaSO ₄ ) were mixed at a weight ratio of 30: 1.33 to prepare a powdered medicine B.

Then, the powdered medicine B and the number of processes were mixed at a weight ratio of 31.33: 56.7 to prepare a liquid B drug solution.

Finally, the grout material of Example 1 was prepared by mixing the liquid A and liquid B in a volume ratio of 1:1.

<Example 2>

Sodium silicate (3 types) and process water were mixed at a mass ratio of 27.7 : 46.7 to prepare an aqueous solution of sodium silicate, silica-sol state A.

And Portland cement and flue gas desulfurization gypsum were mixed at a weight ratio of 26.7 : 3.3 to prepare cement for strength reinforcement.

Then, the strength-enhancing cement and calcium sulfate (CaSO ₄ ) were mixed at a weight ratio of 30: 2.67 to prepare a powder type B medicine.

Subsequently, a liquid B drug solution was prepared by mixing the powdered medicine B and the process water at a weight ratio of 32.67: 56.7.

Finally, the grout material of Example 2 was prepared by mixing the liquid A and the liquid B in a volume ratio of 1:1.

<Comparative Example 1>

Sodium silicate (3 types) and process water were mixed at a mass ratio of 27.7 : 46.7 to prepare an aqueous solution of sodium silicate, silica-sol state A.

And Portland cement and calcium sulfate (CaSO ₄ ) were mixed in a weight ratio of 30: 1.33 to prepare a powder type B medicine.

Subsequently, a liquid B drug solution was prepared by mixing the powdered medicine B and the process water at a weight ratio of 31.33: 56.7.

Finally, the grout material of Comparative Example 1 was prepared by mixing the liquid A and the liquid B in a volume ratio of 1:1.

<Comparative Example 2>

Sodium silicate (3 types) and process water were mixed at a mass ratio of 27.7 : 46.7 to prepare an aqueous solution of sodium silicate, silica-sol state A.

And Portland cement and calcium sulfate (CaSO ₄ ) were mixed at a weight ratio of 30: 2.67 to prepare a powder type B medicine.

Subsequently, a liquid B drug solution was prepared by mixing the powdered medicine B and the process water at a weight ratio of 32.67: 56.7.

Finally, the grout material of Comparative Example 2 was prepared by mixing the liquid A and the liquid B in a volume ratio of 1:1.

<Comparative Example 3>

Sodium silicate (3 types) and process water were mixed at a mass ratio of 27.7 : 46.7 to prepare an aqueous solution of sodium silicate, silica-sol state A.

And Portland cement and flue gas desulfurization gypsum were mixed at a weight ratio of 26.7 : 3.3 to prepare cement for strength reinforcement.

Then, cement for strength reinforcement and process water were mixed at a weight ratio of 30:56.7 to prepare a liquid B liquid.

Finally, the grout material of Comparative Example 3 was prepared by mixing the chemical solution A and the chemical solution B at a volume ratio of 1:1.

<Comparative Example 4>

Sodium silicate (3 types) and process water were mixed at a mass ratio of 27.7 : 46.7 to prepare an aqueous solution of sodium silicate, silica-sol state A.

Then, Portland cement and process water were mixed at a weight ratio of 30:56.7 to prepare a liquid liquid B.

Finally, the grout material of Comparative Example 4 was prepared by mixing the liquid A and liquid B in a volume ratio of 1:1.

The gel time was measured for the grout materials of Examples 1 and 2 of the present invention and Comparative Examples 1 to 4 prepared as above, and [Table 4] below shows the results.

Gel-time test results of Examples and Comparative Examples of the present invention Test Items Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 gel-time (sec) 38 19 79 58 110 230

As can be seen from the above [Table 4], Example 1 of the present invention maintained a gel-time of 38 seconds, which is suitable as a rough material for grout material (the gel-time of a general hard material is 30 to 60 seconds), and has good initial crystallization. Results were shown.

In addition, Example 2 maintained a gel-time of 19 seconds, which is suitable for a quick-setting agent (a gel-time of 5 to 50 seconds for a general quick-setting agent), and showed good initial crystallization results.

On the other hand, in Comparative Example 1, in the case of omitting flue gas desulfurization gypsum, which is a compressive strength enhancer in liquid B under the same conditions as in Example 1, the gel-time was 79 seconds, which was late for use as a finished agent, and the initial crystallization state was very It was bad.

In Comparative Example 2, in the case of omitting flue gas desulfurization gypsum, which is a compressive strength enhancer in liquid B under the same conditions as in Example 2, the gel-time was 58 seconds, which was too late to be used as a quick-setting agent, and the initial crystallization state was also very poor. did

In Comparative Example 3, in the same conditions as Comparative Example 1 and Comparative Example 2, calcium sulfate (CaSO ₄ ), a gel-time regulator in liquid B, was omitted. Although the initial crystallization was somewhat good, the gel-time was 110 seconds. It was found to be unsuitable for use as a finished product.

In Comparative Example 4, under the same conditions as Comparative Example 1 and Comparative Example 2, flue gas desulfurized gypsum as a compressive strength enhancer and calcium sulfate (CaSO ₄ ) as a gel-time regulator were omitted from the liquid B, but the initial crystallization was very poor. , and the gel-time was also 230 seconds, which was found to be unsuitable as a finishing agent.

And the compressive strength was tested for Examples 1 and 2 of the present invention and Comparative Examples 1 to 4. The compressive strength test was performed according to the compressive strength test method of hydraulic cement mortar specified in KS L 5105.

Figure 2 is a compressive strength test photograph of a grout material test piece according to the present invention, Figure 3 is a mold manufactured according to the present invention, and [Table 5] below shows the test results.

Compressive strength test results of Examples and Comparative Examples of the present invention Test Items Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Compressive strength (3 days)
(kg/cm²) 17 20 1.2 1.4 5 1.3 Compressive strength (7 days)
(kg/cm²) 20 25 2.0 2.0 9 4 Compressive strength (28 days)
(kg/cm²) 24 28 2.5 2.8 12 10

As can be seen from the above [Table 5], Example 1 of the present invention has a compressive strength of 17, 20, and 24 kg / cm 2 for 3 days, 7 days, and 28 days, respectively. appeared to be able to function.

In addition, in Example 2, the compressive strength was 20, 25, and 28 kg / cm 2 for 3 days, 7 days, and 28 days, respectively, and it was found that it could function as a quick-setting agent under conditions having sufficient compressive strength.

In contrast, Comparative Example 1 had compressive strengths of 1.2, 2.0, and 2.5 kg/cm 2 at 3, 7, and 28 days, respectively, and was found to be unsuitable for use as a grout material.

In Comparative Example 2, the compressive strength was 1.4, 2.0, and 2.8 kg/cm 2 at 3, 7, and 28 days, respectively, and was found to be unsuitable for use as a grout material.

In Comparative Example 3, the compressive strength was 5, 9, and 12 kg/cm 2 at 3, 7, and 28 days, respectively, and although the compressive strength was not very low, the gel-time and initial crystallization state were very poor.

In Comparative Example 4, the compressive strength was 1.3, 4, and 10 kg/cm 2 at 3, 7, and 28 days, respectively, and although the compressive strength was not very low, the gel-time and initial crystallization state were very poor.

In the above, preferred embodiments of the present invention have been described by way of example, and the scope of the present invention is not limited only to the above embodiments. Those skilled in the art will understand that various changes and modifications are possible without departing from the scope of the technical spirit of the present invention.

Claims (9)

In the manufacturing method of the grout material used in the order grouting construction for forming the order wall in the ground,
(a) preparing a silica-sol state liquid A by adding process water to sodium silicate (Na ₂ SiO ₃ ) to improve bonding strength with general cement (S10);
(b) preparing a compressive strength reinforcing cement capable of improving the compressive strength of the order wall by mixing a compressive strength enhancer with Portland cement (S20);
(c) preparing a powdered medicine B by mixing a gel-time regulator with the compressive strength reinforcing cement prepared in step S20 (S30);
(d) mixing and stirring process water with the powdered B medicine prepared in step S30 to prepare a liquid B liquid (S40);
(e) mixing the silica-sol liquid liquid A prepared in step S10 with the liquid liquid liquid B prepared in step S40;
The sodium silicate used in step S10 is,
Specific gravity is 1.383, silicon dioxide (SiO ₂ ) is 28 to 38% in mass ratio, sodium oxide (Na ₂ O) is 9 to 10% in mass ratio, iron (Fe) content is 0.02% or less, and water The insoluble water-insoluble content is less than 0.2%,
In the step S10, the mixing ratio of the sodium silicate and the process water is 1: 2 to 1: 2.5 in volume ratio,
In the step S20, the compressive strength enhancer is a by-gypsum, and any one of phosphate gypsum, titanium gypsum, and fluorine gypsum is used,
In the step S20, the mixing ratio of the Portland cement and the compressive strength enhancer is 1: 0.07 to 1: 0.3 in weight ratio,
In step S30, the gel-time regulator is calcium sulfate dihydrate (CaSO ₄ 2H ₂ O), glauberite (Na ₂ SO ₄ CaSO ₄ ), potassium calcium sulfate (Potassium Calcium Sulfate: K ₂ Ca (SO ₄ ) ₂ ), calcium hydrogen sulfate (Ca(HSO ₄ ) ₂ ), or sodium calcium sulfate (Sodium Calcium Sulfate: Na ₂ Ca (SO ₄ ) ₂ ) is used,
In the step S30, the mixing ratio of the compressive strength reinforcing cement and the gel-time regulator is 1: 0.03 to 1: 0.15 in weight ratio,
In the step S40, the mixing ratio of the powdered medicine B and the process water is 1: 1.5 to 1: 2.5 by weight, characterized in that the silica-sol phase eco-friendly grout material manufacturing method using a safe material. delete delete delete delete delete delete delete delete

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