KR100932509B1 - A solidification promoting agent, the manufacturing method threrof, high strength solidification agent and solidification method for high strength ground using the solidification promoting agent - Google Patents

Abstract

PURPOSE: A cement solidification accelerator, its preparation method, and a solidifying method of cement using the accelerator are provided to improve the strength of the solidified produce when soft soil particles are cement-solidified. CONSTITUTION: A cement solidification accelerator comprises 20~50 parts by weight of a cement curing material; 100~150 parts by weight of magnesium chloride; 120~160 parts by weight of sodium chloride; 40~70 parts by weight of calcium chloride; 15~30 parts by weight of sodium sulfate; and 2~6 parts by weight of citric acid based on 100 parts by weight of potassium chloride. The cement solidification accelerator comprises further 50~100 parts by weight of a cation exchanger based on 100 parts by weight of the cement solidification accelerator. The cement curing material comprises 10~20 parts by weight of ammonium chloride; 5~15 parts by weight of sodium tripolyphosphate; 5~15 parts by weight of potassium carbonate; and 0.1~3 parts by weight of ferric chloride based on 100 parts by weight of cobalt chloride.

Description

A solidification promoting agent, the manufacturing method threrof, high strength solidification agent and solidification method for high strength ground using the solidification promoting agent }

The present invention relates to a cement-based solidifying agent used to solidify soft granules such as dredged sludges such as seas, rivers, lakes and dams, and cement solidification accelerators and their solidification accelerators for promoting high-strength solidification of cement in the cement-based solidifying agent. It relates to a manufacturing method and a solidification method using the cement-based solidifying agent.

It is preferable to dredge and remove this sedimentary bottom sludge because soil function is impaired when sediments are deposited in the sea, rivers, lakes and dams. However, even if the sedimentation basins are dredged, there is no place to dispose of them. Therefore, secondary reuse due to the solidification and harmlessness of the dredged soil is required.

Normally, the sedimentary floor sludge has a surface covered with the decomposition of humic acid and dissolved with humic acid. This humic acid prevents the cement's coagulation reaction by interfering with the contact of calcium cation (+) and anion (-) of the cement. Therefore, it is not very easy to solidify the sedimentation sludge only with cement. Cement only stays in the role of suppressing fluidization of the sedimentary bottom sludge, and does not contribute to the solidification effect that enables the solidified material to exhibit strength such as bearing capacity.

The present invention has a technical problem to provide a cement solidification accelerator that can improve the strength of the solidified when the solid granules such as dredged sludge such as sea, river, lake, dam.

In addition, the present invention has a technical problem to provide a high strength solidification method excellent in economics and workability as a preferred method of using the cement solidification accelerator.

The present invention provides a cement hardening accelerator and a method of manufacturing the same, and a high strength cementitious solidifying agent and a high strength solidifying method having the following technical characteristics in order to solve the above technical problem.

Cement solidification accelerator according to the present invention, 20 to 50 parts by weight of cement fire, 100 to 150 parts by weight of magnesium chloride, 120 to 160 parts by weight of sodium chloride, 40 to 70 parts by weight of calcium chloride, 15 to 30 parts of sodium sulfate based on 100 parts by weight of potassium chloride It is composed of parts by weight, 2 to 6 parts by weight of citric acid, the cement hardener is 10 to 20 parts by weight of ammonium chloride, 5 to 15 parts by weight of sodium tripolyphosphate, 5 to 15 parts by weight of potassium carbonate, chloride It is characterized by consisting of 0.1 to 3 parts by weight of ferric iron.

In the method for preparing a solidification accelerator according to the present invention, (a) 10 to 20 parts by weight of ammonium chloride is added to 100 parts by weight of cobalt chloride, and 70 to 100 ° C of water is injected to dissolve by volume ratio 6: 4 to 7: 3. Then, 5 to 15 parts by weight of sodium tripolyphosphate, 5 to 15 parts by weight of potassium carbonate, 0.1 to 3 parts by weight of ferric chloride to prepare a cement hardener; (b) spraying and mixing 20 to 50 parts by weight of the liquid cement hardener prepared in step (a) with respect to 100 parts by weight of potassium chloride, and then mixed by adding 100 to 150 parts by weight of magnesium chloride, followed by 120 to 160 parts by weight of sodium chloride, 40 to 70 parts by weight of calcium chloride, 15 to 30 parts by weight of sodium sulfate, and 2 to 6 parts by weight of citric acid are added to and mixed with each other.

The high-strength cement-based solidifying agent according to the present invention is characterized by comprising 1 to 2 parts by weight of the above cement hardening accelerator with respect to 100 parts by weight of cement.

Another high-strength solidification method according to the present invention comprises the steps of: (a) mixing 6 to 10 parts by weight of cement with respect to solidification target soils; (b) adding and mixing the cement solidification accelerator to the mixture of step (a), but mixing 1 to 2 parts by weight of the cement solidification accelerator with respect to 100 parts by weight of the cement of step (a); (c) pouring the mixture of step (b) to solidify curing.

According to the present invention, the following effects can be expected.

First, it is possible to provide a solidification of the cement solidification to enable the rapid solidification treatment and to improve the strength of the solidified, and also to exhibit an excellent effect in the in-phase condition as well as to have a favorable effect in water retention.

Second, it is possible to provide a cement hardening accelerator that effectively exerts an effect irrespective of the type of soft soil such as loam, masato, and sandy soil.

Third, it can be advantageously applied to various solidification methods for soil improvement of soil pavement, promenade, stadium, etc. Especially, when applied to the solidification method for road pavement, the paving thickness is increased due to the strength enhancing effect by cement hardening accelerator. It can be thinned and can reduce related construction cost.

Cement solidification accelerator according to the present invention is used in the solidification method of stabilizing the ground by mixing and stirring with cement and soft soil, 20 to 50 parts by weight of cement hardener, 100 to 150 parts by weight of magnesium chloride, 120 to 160 parts by weight of sodium chloride, 40 to 70 parts by weight of calcium chloride, 15 to 30 parts by weight of sodium sulfate, 2 to 6 parts by weight of citric acid, the cement hardener is 10 to 20 parts by weight of ammonium chloride per 100 parts by weight of cobalt chloride, tripoly It is characterized by consisting of 5 to 15 parts by weight of sodium phosphate, 5 to 15 parts by weight of potassium carbonate, and 0.1 to 3 parts by weight of ferric chloride.

Solidification accelerator according to the present invention is largely divided into functional materials and cement hardeners. The functional material is a component that contributes to condensation connection between the soft granules, and the cement hardener is a component that contributes to promoting cement hardening. In the cement hardening accelerator according to the present invention, the functional material is composed of calcium chloride, magnesium chloride, potassium chloride, sodium chloride, calcium chloride, sodium sulfate, citric acid, and cement hardener is composed of cobalt chloride, ammonium chloride, sodium tripolyphosphate, potassium carbonate, ferric chloride. . In the cement hardening accelerator according to the present invention, the content of each raw material is a range proposed to optimize the performance expression of each raw material.

In functional materials, calcium chloride, magnesium chloride, and sodium sulfate react with water of cement and soft granules to produce ethrinzite (3CaO · Al ₂ O _{3 ·} 3CaSO _{4 ·} 32H ₂ O), which is juicy and stable. It serves to condense.

Potassium chloride and sodium chloride in the functional material is rapidly dissolved by citric acid, and the various ions are dissolved in the organic material contained in the sludge, etc., so that the organic material does not interfere with the coagulation reaction of cement. Accordingly, the coagulation reaction by calcium ions of the cement is promoted, and at the same time, calcium silicate is generated while the calcium ions smoothly penetrate between the soft granules, and finally, ethrinzite is produced to promote high strength solidification. Citric acid also acts as a frostbite inhibitor.

In cement hardeners, cobalt chloride, ammonium chloride, and calcium carbonate serve to accelerate the hydration reaction of cement, sodium tripolyphosphate as dispersant, and ferric chloride, Fe ₂ ³⁺ , is a trivalent cation. Ion exchange reaction with monovalent cations promotes stiffness.

On the other hand, the cement solidification accelerator according to the present invention 50-100 parts by weight of the cation exchanger with respect to 100 parts by weight of the above-mentioned cement solidification accelerator (cement solidification accelerator consisting of potassium chloride, cement hardener, magnesium chloride, sodium chloride, calcium chloride, sodium sulfate, citric acid) It can also add and comprise. The cation exchanger reacts with the calcium hydroxide produced by the cement hydration reaction (pozzolanic reaction) to contribute to the enhancement of long-term strength, and a representative example is zeolite whose main component is silicon oxide and alumina. In particular, the zeolite can be used as a cation exchanger, an artificial zeolite obtained by artificially converting an incineration ash of flammable waste such as coal ash and municipal waste, an incineration ash of waste solidifying fuel, and the like by heating with an alkaline solution. However, in order to efficiently react as a cation exchanger, a material having a polyvalent cation is preferable. Among the zeolites, calcium zeolite is used.

The cement solidification accelerator as described above, (a) 10 to 20 parts by weight of ammonium chloride is added to 100 parts by weight of cobalt chloride, and then injected by dissolving water at 70 to 100 ° C so that the volume ratio is 6: 4 to 7: 3, and then dissolved. 5 to 15 parts by weight of sodium tripolyphosphate, 5 to 15 parts by weight of potassium carbonate, and 0.1 to 3 parts by weight of ferric chloride to prepare a liquid cement hardener; (b) spraying and mixing 20 to 50 parts by weight of the liquid cement hardener prepared in step (a) with respect to 100 parts by weight of potassium chloride, and then mixed by adding 100 to 150 parts by weight of magnesium chloride, followed by 120 to 160 parts by weight of sodium chloride, 40 to 70 parts by weight of calcium chloride, 15 to 30 parts by weight of sodium sulfate, and 2 to 6 parts by weight of citric acid are mixed and mixed; can be prepared by performing. Furthermore, after step (b), the step (c) of drying the mixture of step (b) and then mixing 50-100 parts by weight of the cation exchanger with respect to 100 parts by weight of the dry mixture may further proceed.

In preparing the cement solidification accelerator in the above manner, it is preferable to prepare raw materials in powder form of 100 mesh or less for uniform mixing in the mixing process of each raw material, and also because the raw materials have high hygroscopicity and change in appearance It is preferable to store and prepare in a dry state at room temperature.

Such cement hardening accelerator may be used in the solidification method together with cement and soft soil. The solidification method according to the present invention comprises the steps of: (a) mixing 6 to 10 parts by weight of cement with respect to solidification target soil; (b) adding a cement solidification accelerator to the mixture of step (a) and mixing the mixture, adding 1 to 2 parts by weight of cement solidification accelerator based on 100 parts by weight of the cement of step (a); and (c) Comprising the step of pouring the mixture of step (b) curing. At this time, the type of soil to be solidified in step (a) is not particularly limited in the type of soil, but soft ground soil composed of granulated soil series is preferred.

In the step (a), it is preferable to proceed in a state in which the moisture content of the solidification target soil is adjusted to 15 to 20% by weight, and the moisture content at this time is an optimum water content for rapid cement solidification by the hydration reaction. If the water content of the solidified soil is less than 15%, add more adjustment water to the soil to be solidified and mix it. Then, proceed to step (a). After drying the soil to be solidified to ~ 20% by weight to proceed to step (a).

In addition, the step (b), (b1) is a step of mixing the cement solidification accelerator in the mixture of the step (a); and (b2) 0.5 to 2% by weight of the AE agent (cement 100) relative to the amount of cement Adding at least one of 0.5 to 2 parts by weight based on the weight part and 3 to 8% by weight of zeolite (3 to 8 parts by weight based on 100 parts by weight of the solidified soil), and mixing the mixture; It may be made of. The air-entraining agent (b2) in step (b2) evenly generates small independent bubbles in the solidified material (solidification soil + cement + solidification accelerator) to improve durability such as freeze-melting resistance and corrosion resistance. . The zeolite of step (b2) is further included separately from the zeolite as a cation exchanger already included in the cement solidification accelerator of step (b1), and the vegetation of vegetation, strength, water channel construction, foundation base composition, salt prevention, heavy metals It is proposed to play an advantageous role in the case of requiring special functions such as improvement of pollution. In other words, since the cement solidification accelerator already contains zeolite as a cation exchanger, it is not necessary to add the zeolite of step (b2) to the solidification method such as general natural soil packing, but in case of requiring a special function (b2) The zeolite of the stage is further added to express additional performance by the zeolite.

Furthermore, the solidification method according to the present invention may further perform the step (d) of applying a deterioration preventing material to the curing solidified surface of the step (c) after the step (c). The deterioration preventing material is preferably an alkali silicate solution, 0.01 to 0.1 parts by weight based on 100 parts by weight of cement, and when the aqueous solution of silicic acid is applied to the surface of the solidified material, it penetrates and causes substitution reaction with ions in the solidified material. Glass) to serve as a deterioration preventing material.

Hereinafter, the present invention will be described in detail with reference to Examples and Test Examples. However, the following Examples and Test Examples are only for illustrating the present invention, and the scope of the present invention is not limited thereto.

Example 1 Cement Solidification Promoter Preparation

1. Composition of cement hardening accelerator

A cement hardening accelerator raw material was prepared in the composition shown in Table 1 below.

Raw material composition of cement hardening accelerator material weight% Parts by weight Potassium chloride 10 100 Magnesium chloride 14 140 Sodium chloride 15 150 Calcium chloride 5 50 Sodium sulfate 3 30 Citric acid 0.3 3  Cement hardener Cobalt chloride 2.7 2 27 20 (100) Ammonium chloride 0.3 3 (15) Sodium tripolyphosphate 0.2 2 (10) Potassium carbonate 0.15 1.5 (7.5) Ferric chloride 0.05 0.5 (2.5) Zeolite 50 -

2. Cement solidification accelerator manufacturing

The cement solidification accelerator was prepared using the materials shown in Table 1 below.

(a) First, cement hardening material is manufactured.

Cement hardener is added to 15 parts by weight of ammonium chloride to 100 parts by weight of cobalt chloride, and then dissolved by dissolving water at 80 ° C. in a volume ratio of 6: 4 to 7: 3, followed by 10 parts by weight of sodium tripolyphosphate and 5 to 15 potassium carbonate. It is prepared by dissolving by weight parts, and finally by adding 2.5 parts by weight of ferric chloride, and the cement hardener thus prepared is in a liquid state.

(b) Next, the cement hardener prepared in the liquid state is mixed with other materials.

Specifically, the spray is mixed with 27 parts by weight of a liquid cement hardener with respect to 100 parts by weight of potassium chloride, and then mixed with 140 parts by weight of magnesium chloride, followed by mixing by adding 150 parts by weight of sodium chloride and 50 parts by weight of calcium chloride, followed by mixing with sodium sulfate. 30 parts by weight is added and mixed, and then 3 parts by weight of citric acid is added and mixed.

(c) Finally, Ca type zeolite is added and mixed with a cation exchanger.

Specifically, this step is followed by natural drying of the mixed mixture through step (b) for 1 hour, and then mixed with Ca-type zeolite in the same amount as the dry mixture.

Example 2 Physical Properties of Solids

Cement, soft soil, cement solidification accelerator prepared in Example 1 was prepared by mixing the solidified specimens and then subjected to various physical property tests on the specimens. The specimens used in the physical property test were prepared by adjusting the sample to the optimum moisture content according to the preliminary solidification test, adding and mixing cement with respect to the dry weight of the sample, and then adding and mixing the cement hardening accelerator according to Example 1. However, the specimens were ramped so that the moisture content of the specimens did not change during curing after die demoulding, and the physical property test was carried out after 6 days of air curing (20 ℃) and 1 day water immersion curing (20 ℃).

1. Test Example 1-Single-axial compressive strength test

(1) Test method

The uniaxial compressive strength test was carried out according to the Japanese Pavement Test Manual, and the formulations for the preparation of the specimens were carried out according to the soil types (rom, masato, and sandy soil) as shown in Tables 2, 3, and 4 below.

Formulation of specimens using ROM Formulation Number Addition amount by weight of soil Added amount of solidification accelerator (parts by weight based on 100 parts by weight of cement) Sansa addition amount Amount of cement added One 0 4 0 2 0 6 0 3 0 8 0 4 0 10 0 5 0 4 One 6 0 6 One 7 0 8 One 8 0 10 One 9 10 4 One 10 10 6 One 11 10 8 One 12 10 10 One 13 0 4 2 14 0 6 2 15 0 8 2 16 0 10 2 17 10 4 2 18 10 6 2 19 10 8 2 20 10 10 2

Specimen Formulation Using Masato Formulation Number Addition amount by weight of soil Added amount of solidification accelerator (parts by weight based on 100 parts by weight of cement) Sansa addition amount Amount of cement added 21 0 4 0 22 0 6 0 23 0 8 0 24 0 10 0 25 0 4 One 26 0 6 One 27 0 8 One 28 0 10 One 29 10 4 One 30 10 6 One 31 10 8 One 32 10 10 One 33 0 4 2 34 0 6 2 35 0 8 2 36 0 10 2 37 10 4 2 38 10 6 2 39 10 8 2 40 10 10 2

Specimen Mixture Using Sandy Soil Formulation Number Addition amount by weight of soil Added amount of solidification accelerator (parts by weight based on 100 parts by weight of cement) Sansa addition amount Amount of cement added 41 0 4 0 42 0 6 0 43 0 8 0 44 0 10 0 45 0 4 One 46 0 6 One 47 0 8 One 48 0 10 One 49 10 4 One 50 10 6 One 51 10 8 One 52 10 10 One 53 0 4 2 54 0 6 2 55 0 8 2 56 0 10 2 57 10 4 2 58 10 6 2 59 10 8 2 60 10 10 2

(2) Test result

The results of the uniaxial compression test were shown in FIGS. 1 to 3. In particular, in the case of the formulation using sandy soil (no added sansa, 6% by weight of cement) was subjected to one compression test for each age, the results are shown in Table 5 and FIG. Overall, it was confirmed that the compressive strength was increased when the cement hardening accelerator was added.

Compressive Strength Test Results by Age in Mixture Using Sandy Soil Age Displacement (mm) Load (kgf) Single Axis Compressive Strength (kgf / c) Added amount of solidifying accelerator 2 days 2.37 94.2 1.2 No addition 4 days 2.55 612.3 7.8 7 days 1.76 1169.7 14.9 14 days 1.64 1609.3 20.5 2 days 2.22 361.1 4.6 1 part by weight based on 100 parts by weight of cement 4 days 1.70 910.6 11.6 7 days 1.69 1350.2 17.2 14 days 1.65 1797.7 22.9 2 days 1.98 463.2 5.9 2 parts by weight per 100 parts by weight of cement 4 days 1.76 1067.6 13.6 7 days 1.77 1609.3 20.5 14 days 1.80 2025.3 25.8

2. Test Example 2-Frostbite test

(1) Test method

In-phase test was carried out as shown in Figure 5 under the test conditions shown in Table 6. Specimens for in-phase test were produced in the formulation shown in Table 10 below. At the initial height of the specimen, the height of the specimen after frostbite was measured by vernier calipers (Nogis), which was used as the frostbite quantity.

Frostbite test method Item Condition Municipal Law  Diameter 6 cm, thickness 4 cm  Curing temperature, time  0 ° C, 24 hours  Test temperature, time  -20 ℃, 92 hours

Frostbite test specimen formulation number Earth and sand kind Addition amount by weight of soil Added amount of solidification accelerator (parts by weight based on 100 parts by weight of cement) Sansa addition amount Amount of cement added One ROM 0 0 0 2 0 5 0 3 0 5 One 4 0 5 One 5 10 0 0 6 10 5 0 7 10 5 One 8 10 5 One

(2) Test result

In-phase test results are shown in Table 8 and FIG. As can be seen it can be seen that the amount of frostbite decreases as the cement solidification accelerator is added. From these results, it is expected that the cement solidification accelerator according to the present invention can be usefully applied to treating the playground of the cold districts by the solidification method.

Frostbite test results number Test specimen thickness before test (mm) Thickness of specimen after test (mm) Frostbite amount (mm) Frosting rate (%) One 4.01 4.97 0.96 24.9 2 4.01 4.88 0.87 21.7 3 4.06 4.47 0.41 10.1 4 4.02 4.39 0.37 9.2 5 4.01 4.39 0.92 22.9 6 4.02 4.90 0.88 21.9 7 4.03 4.45 0.42 10.4 8 4.01 4.33 0.32 8.0

3. Test Example 3-Water retention test

(1) Test method

In the water retention test, the specimen (1000ml) prepared at the optimum water content was measured for 6 days in air curing and 1 day in water curing, and then the weight of the specimen saturated with water was used as the reference weight of the specimen, and the specimen was placed in a constant temperature room at 20 ° C. The water holding capacity was calculated from the weight change. The formulation of the test specimen for the water retention test is shown in Table 9 below.

Conservative test specimen formulation number Earth and sand kind Addition amount by weight of soil Added amount of solidification accelerator (parts by weight based on 100 parts by weight of cement) Sansa addition amount Amount of cement added One ROM 0 0 0 2 0 5 One 3 10 5 One 4 Masato 0 0 0 5 0 5 One 6 10 5 One 7 Sandy soil 0 0 0 8 0 5 One 9 10 5 One

(2) Test result

Conservative test results are shown in Table 10 and FIG. As can be seen, the repair effect can be confirmed when the cement and cement solidification accelerator are used together.

Conservative Test Results number 0 24 hours later 48 hours later After 72 hours 96 hours later 7 days later One 100 95.5 88.5 82.3 77.4 73.2 2 100 98.4 95.9 90.6 85.1 80.4 3 100 98.1 96.5 91.3 86.2 79.3 4 100 93.0 84.1 80.0 78.2 70.1 5 100 96.4 90.0 85.7 82.2 76.3 6 100 97.1 92.6 87.5 83.9 77.4 7 100 92.8 86.1 84.6 79.9 73.2 8 100 95.5 90.2 88.1 83.9 78.9 9 100 96.7 92.0 90.0 85.4 79.7

4. Test Example 4-Uniaxial Compressive Strength Test After Freeze-thawing

(1) Test method

The uniaxial compressive strength test after freeze-thawing was carried out under the test conditions shown in Table 11 below. The specimens were prepared in the formulations shown in Table 10 below, and the specimens prepared in each formulation were subjected to 6 days of air curing, 1 day of underwater curing, and then to freeze-thawing test, and uniaxial compression test after 7 cycles.

Test method for uniaxial compressive strength after freeze thawing Item Condition Freezing temperature  -23 ℃  Melting temperature  20 ℃ Freezing time  18 hours Melting time  6 hours Freeze thaw recovery  7cycle

Combination of uniaxial compressive strength test specimen after freeze thawing number Earth and sand kind Addition amount by weight of soil Added amount of solidification accelerator (parts by weight based on 100 parts by weight of cement) Sansa addition amount Amount of cement added One Clay soil 0 6 0 2 0 8 0 3 0 10 0 4 0 6 One 5 0 8 One 6 0 10 One 7 10 6 One 8 10 8 One 9 10 10 One 10 Masato 0 6 0 11 0 8 0 12 0 10 0 13 0 6 One 14 0 8 One 15 0 10 One 16 10 6 One 17 10 8 One 18 10 10 One 19 Sandy soil 0 6 0 20 0 8 0 21 0 10 0 22 0 6 One 23 0 8 One 24 0 10 One 25 10 6 One 26 10 8 One 27 10 10 One

(2) Test result

The results of the uniaxial compressive strength test after freeze thawing are shown in Table 13 and FIG. 8. As can be seen it can be seen that the strength decrease rate decreases as the cement solidification accelerator is added. From these results, it is expected that the cement solidification accelerator according to the present invention can be usefully applied to treating the playground of the cold districts by the solidification method.

Test results of uniaxial compressive strength after freeze thawing number Types of soil Single Axis Compressive Strength (kgf / c) Single Axis Compressive Strength After Freeze-thawing Strength reduction (kgf / c) Strength reduction rate (%) One Clay soil  4.1  0.9  3.2  78.0 2  4.8  1.1  3.7  77.1 3  6.4  1.8  4.6  71.9 4  4.7  2.0  2.7  57.4 5  6.7  2.9  3.8  56.7 6  8.5  4.7  3.8  44.7 7  5.9  2.9  3.0  50.8 8  8.5  4.3  4.2  49.4 9  10.8  4.8  6.0  55.6 10 Masato  8.9  2.9  6.0  67.4 11  12.9  5.0  7.9  61.2 12  16.3  6.3  10.0  61.3 13  14.0  7.8  6.2  44.3 14  16.8  9.9  6.9  41.1 15  18.3  10.1  8.2  44.8 16  15.9  7.4  8.5  53.5 17  17.0  10.3  6.7  39.4 18  20.2  11.9  8.3  41.1 19 Sandy soil  14.9  4.4  10.5  70.5 20  22.4  8.7  13.7  61.2 21  28.6  9.0  19.6  68.5 22  17.2  8.5  8.7  50.6 23  26.1  12.9  13.2  50.6 24  33.0  19.2  13.8  41.8 25  17.9  7.2  10.7  59.8 26  26.3  10.7  15.6  59.3 27  34.8  20.8  14.0  40.2

5. Test Example 5-Compressive Strength Test

(1) Test method

The compressive strength test was carried out under the test conditions shown in Table 14 below, and was carried out by the compression test Marshall test method. The specimen for the compressive strength test was prepared in the formulation as shown in Table 15, the temperature of the specimen was carried out at room temperature.

Compressive Strength Test Method Exam conditions Test Methods  Disclosure Marshallanma  50 times Curing days 20 ℃ 6 days 20 ℃ 1 day (water)

Compressive strength test specimen formulation number Earth and sand kind Addition amount by weight of soil Added amount of solidification accelerator (added amount to 100 parts by weight of cement) Sansa addition amount Amount of cement added Asphalt Emulsion Addition One ROM 0 5 - 0 2 0 5 - One 3 0 5 - 2 4 10 5 - 0 5 10 5 - One 6 10 5 - 2 7 Masato 0 5 - 0 8 0 5 - One 9 0 5 - 2 10 10 5 - 0 11 10 5 - One 12 10 5 - 2 13 Sandy soil 0 5 - 0 14 0 5 - One 15 0 5 - 2 16 10 5 - 0 17 10 5 - One 18 10 5 - 2 19 Sandy soil 10 5 6 0 20 10 5 6 One 21 10 5 6 0 22 10 5 6 One

(2) Test result

Compressive strength test results are shown in Table 16 below. As can be seen it can be seen that as the cement solidification accelerator is added, the compressive strength increases. In particular, as the amount of cement hardening accelerator was increased, the compressive strength was increased. Furthermore, the cement hardening accelerator was found to have good mixing with the cement emulsion asphalt emulsion.

Compressive Strength Test Results number Types of soil Stability (kgf) Displacement (mm) Strength growth rate (%) One ROM 428 2.45 100 2 505 2.38 118 3 560 3.16 131 4 589 2.46 100 138 5 678 2.45 115 158 6 700 2.73 119 164 7 Masato 655 2.35 100 8 705 2.25 108 9 800 2.23 122 10 729 2.21 100 111 11 852 2.31 117 130 12 914 2.47 125 139 13 Sandy soil 645 2.58 100 14 693 2.33 107 15 745 2.59 116 16 720 2.58 100 111 17 880 2.61 122 136 18 939 2.88 130 145 19 Sandy soil (asphalt emulsion) 863 3.69 100 20 1058 3.48 123 21 955 3.44 100 110 22 1210 3.63 127 140

6. Test Example 6-Wheel tracking test

(1) Test method

The wheel tracking test was carried out according to the Japanese Packaging Test Method Manual (Test Condition 60 ° C, 1 hour, Ground Pressure 6.4kg / cm 2, Retention Time 8 Hours), and the formulation for preparation of the specimens is shown in Table 17 below.

Wheel tracking test specimen formulation  number Particle Size of Aggregate (Aggregate Size) Addition amount to aggregate (% by weight) Cement solidification accelerator (parts by weight based on 100 parts by weight of cement) Asphalt Addition Addition amount of asphalt emulsion for cement mixing Amount of cement added One 13 mm denseness Ascon 5.6% - - - 2 - 6.8% 5.0% - 3 - 6.8% 5.0% One  1) Blend 1 is a heated asphalt mixture. 2) Blends 2 and 3 are asphalt mixtures at room temperature. 3) Asphalt emulsion for cement mixing is the addition amount as a solid content. 4) Cement is usually a portant cement. 5) Aggregate granularity aimed at the median of the granularity range of asphalt pavement 13 mm asbestos.

(2) Test result

Compressive strength test results are shown in Table 18 below. As can be seen it can be seen that the dynamic stability is significantly improved when the cement solidification accelerator is added. In addition, even after the test, unnatural cracks were not observed in the specimens.

Wheel tracking test result number Specimen Density (g / ㎠) Reference density (g / ㎠) Height (%) Dynamic Stability (times / mm) Dynamic Stability Average One  ①  2.355  2.359  99.8  890  939  ②  2.361  100.1  988 2  ①  2.334  2.338  99.8  4500  4875  ②  2.341  100.1  5250 3  ①  2.338  2.338  100.0  10200  9600  ②  2.329  99.6  9000

7. Comprehensive Evaluation

As a result of confirming through the various tests as described above, when the cement solidification accelerator according to the present invention is applied to the solidification method, it has been shown to exhibit excellent effects such as strength enhancement. Accordingly, the cement solidification accelerator according to the present invention is expected to be usefully used in various solidification methods for soil improvement such as soil pavement, promenade, and stadium. In particular, when the cement hardening accelerator according to the present invention is applied to the solidification method for road pavement, it is possible to secure more than a certain strength even at a thin pavement thickness due to the strength enhancing effect by the cement hardening accelerator, thereby reducing the overall construction cost.

1 to 4 are graphs showing the results of the uniaxial compressive strength test.

5 is a diagram showing a test method for the in-phase test.

6 is a graph showing in-phase test results.

7 is a graph showing the results of conservative test.

8 is a graph showing the results of the uniaxial compressive strength test after freeze thawing.

Claims (11)

delete 20 to 50 parts by weight of cement hardener, 100 to 150 parts by weight of magnesium chloride, 120 to 160 parts by weight of sodium chloride, 40 to 70 parts by weight of calcium chloride, 15 to 30 parts by weight of sodium sulfate, and 2 to 6 parts by weight of citric acid The cement hardening material is cement solidification consisting of 10 to 20 parts by weight of ammonium chloride, 5 to 15 parts by weight of sodium tripolyphosphate, 5 to 15 parts by weight of potassium carbonate, and 0.1 to 3 parts by weight of ferric chloride, based on 100 parts by weight of cobalt chloride. As an accelerator, 50 to 100 parts by weight of the cation exchanger is further added to 100 parts by weight of the cement solidification accelerator. In claim 2, Cement solidification accelerator, characterized in that the cation exchange agent is zeolite. delete (a) 10 to 20 parts by weight of ammonium chloride is added to 100 parts by weight of cobalt chloride, followed by dissolving water at 70 to 100 ° C. in a volume ratio of 6: 4 to 7: 3, and then dissolving 5 to 15 parts by weight of sodium tripolyphosphate. 5 to 15 parts by weight of potassium carbonate and 0.1 to 3 parts by weight of ferric chloride to prepare a liquid cement hardener; (b) spraying and mixing 20 to 50 parts by weight of the liquid cement hardener prepared in step (a) with respect to 100 parts by weight of potassium chloride, and then mixed by adding 100 to 150 parts by weight of magnesium chloride, followed by 120 to 160 parts by weight of sodium chloride, 40 to 70 parts by weight of calcium chloride, 15 to 30 parts by weight of sodium sulfate, and 2 to 6 parts by weight of citric acid, followed by mixing; (c) mixing the mixture of step (b) by adding 50-100 parts by weight of a cation exchanger to 100 parts by weight of the dry mixture; Cement solidification accelerator manufacturing method characterized in that consisting of. A high-strength cement-based hardener, comprising 1 to 2 parts by weight of the cement hardening accelerator according to claim 2 based on 100 parts by weight of cement. (a) mixing 6 to 10 parts by weight of cement to be solidified with respect to 100 parts by weight of the soil to be solidified; (b) the cement solidification accelerator according to claim 2 or 3 is added to the mixture of step (a) and mixed, and the cement solidification accelerator is 1 to 2 parts by weight based on 100 parts by weight of the cement of step (a). Injecting and mixing; (c) pouring the mixture of step (b) to solidify curing; High strength solidification method characterized by consisting of. In claim 7, The step (a) is a high-strength solidification method characterized in that the water content of the solidification target soil is 15 to 20% by weight after the addition of the adjusted water (調整 水) to the solidification target soil mixed or dried solidification target soil. In claim 7, In step (b), (b1) mixing the cement solidification accelerator into the mixture of step (a); (b2) adding at least one of 0.5 to 2 parts by weight of the AE agent and 3 to 8 parts by weight of zeolite based on 100 parts by weight of the cement to be solidified, based on 100 parts by weight of the cement; Method. In claim 7, After step (c), (d) applying a deterioration preventing material to the curing solidified surface of the step (c); High strength solidification method characterized in that the further In claim 10, The deterioration preventing material of step (d) is an alkali silicate solution, high strength solidification method, characterized in that the use of 0.01 to 0.1 parts by weight based on 100 parts by weight of the cement of step (a).

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