KR100830437B1 - Grout composite - Google Patents

Abstract

A grout composition is provided to prevent crack in a construction by employing natural gum, to obtain excellent waterproofing and higher strength in a construction by employing sodium bentonite and liquid acrylic resin. A grout composition comprises 60-85% by weight of powder formulation and 15-40% by weight of liquid formulation. The powder formulation comprises 50-60% by weight of cement, 35-45% by weight of silica, 0.10-0.15% by weight of aluminate, 0.25-0.4% by weight of naphthalene, 0.2-0.4% by weight of silica-fume, 1.5-2.4% by weight of sodium bentonite, and 2.5-2.9% by weight of natural gum powder. The liquid formulation comprises 17-23% by weight of liquid acrylic resin, 42-52% by weight of water, 7-8% by weight of EVA polymer as a liquid flocculant, 1.3-1.7% by weight of oil and fat and 19.4-25.6% by weight of superplasticizer(2.4-2.6% by weight of surfactant, 17-23% by weight of lignin). The oil and fat are from plant oil and animal fat. The cement in the powder formulation comprises 90% by weight of cement having particle size larger than 5mum and at most 15mum, and 10% by weight of cement having particle size of 1-5mum. The silica in the powder formulation comprises 30-50% by weight of silica having particle size of #6(at most 0.6mm) and 50-70% by weight of silica having particle size of #7(at most 0.3mm).

Description

 Grout Composition {Grout Composite}

The present invention relates to a grout composition, and more particularly to a grout composition used in the grouting method of injecting cement mortar so that the safety of reinforcement of soft ground or settlement of buildings and construction does not cause a safety risk.

As is well known, the cement mortar grouting method is to fill the cement mortar by filling the foundation site to be reinforced. Thus, the grout composition of cement mortar has already been disclosed in various patent documents and the like.

Representative examples of such grout compositions are as follows.

Japanese Patent Application Laid-Open Nos. 53-16410 and 55-109255 disclose methods for producing a non-shrink grout composition by properly combining portland cement with an expandable admixture, a fluidizing agent, and fine aggregate, and the like. 150434 and 60-221355 are known to add ultra-fine layered materials or activated silica for the purpose of increasing compressive strength.However, non-condensed grout compositions based on portland cement are often used as lime-based or It is essential to use CSA-based expanders (Japanese Patent Application Laid-Open No. 53-21219, Patent Publication No. 55-10554) consisting of calcium sulfo aluminate and anhydrous gypsum and glass oxide, depending on the properties of the grout composition. Physical properties are greatly affected.

In other words, the lime-to-CSA-based inflator has a fast hydration activity, which makes it difficult to secure quality stability, such as weathering easily, and the shrinkage compensation and expansion effect in air curing are lowered compared to those in underwater curing. Excessive use of intumescent materials may lead to cracking and lowering of strength due to increased voids caused by expansion.

In order to achieve high strength at an early stage, superhard cement is used (Japanese Patent Publication No. 61-191550), or a cement containing calcium aluminate (3CaOoAl ₂ O ₃ ) is used. 53-19614) There is a problem in use such as working time is only a few minutes, so the range of use such as filling and repairing of local area is limited.

Therefore, a super-rigid non-contraction grout composition has been proposed in the Republic of Korea Patent Publication No. 1998-0153089 (name of the invention: super-rigid non-contraction grout composition). This is based on 100 parts by weight of the particle size-controlled calcium alumino sulfate-based cement, 2 to 10 parts by weight of a mixture containing a suitable amount of a dispersant, a thickener, a powder resin, an antifoaming agent and a retardant and a coagulation control agent.

It is to provide an ultra-rigid non-contraction grout composition composed of 100 ~ 150 parts by weight.

Therefore, it overcomes the problems of quality stability, which is a disadvantage of grout compositions using a mixture of CSA-based expanders, and limitations of working time due to the use of cement with increased cemented carbide and calcium aluminate contents. Even when it is maintained, there is an advantage that the construction is easy and the quality control is easy because there is no dry shrinkage even when expressing high strength at an early stage.

On the other hand, such a grout composition has a problem that cracks occur due to partial stress variation as time elapses as strength is expressed early after construction, and the gap between aggregates is not very precise, and strength is not sufficiently secured. The powdered resin of the grout composition is easily separated and lost in water, resulting in a problem of deterioration in construction quality.

In order to solve this problem, the object of the present invention is to provide elasticity to the grout composition to prevent cracking, and to improve the strength by densely filling voids between aggregates with a gel-like material, so that powder materials such as cement are not separated in water. It is to provide a grout composition to provide a waterproof and reinforcing performance.

In order to achieve the above object, the present invention comprises a powder by mixing naphthalene, silica, bentonite powder, natural rubber powder in addition to cement, silica sand, and aluminate to adjust the density, liquid acrylic resin, water, liquid coagulant, A grout composition is prepared by preparing a fat and oil dispersant and a fluidizing agent as a liquid and stirring them in the field.

Accordingly, the present invention can prevent the occurrence of cracks by receiving it evenly by the evenly distributed natural rubber even if a partial stress deviation occurs in the constructed filling,

Bentonite expands the pores of the material expanded by the aluminate and tightly fills the pores of the aggregate in a gel state to prevent leaks and cracks.

By coating the circumference of the powder material by the liquid acrylic resin it is possible to secure excellent physical properties that can prevent the separation of aggregates in water.

When described in detail with reference to the accompanying drawings the present invention as follows.

First, the present invention prepares a powder formulation having the following composition.

Cement is first prepared for the composition of the powder formulation in the present invention. As the cement used in the present invention, super high strength can be obtained by using any cement such as portland cement, medium heat, crude steel, and crude steel, which are portland cement and slag mixed cement, but it is preferable to use crude steel and cemented steel cement. good. Based on Abrams' water cement theory, which is the most common theory about the strength of cement concrete, the amount of water with cement size less than 5㎛ It was found out that it was necessary to control the particle size distribution of cement. That is, in the case of a general steel cement, the particle size of 15 μm or less contained 35 to 45% by weight and the particle size of 5 μm or less contained 15 to 20% by weight. In the present invention, the particle size exceeded 5 μm, and 90% by weight of cement having a particle size of 15 μm or less and cement containing 10% by weight of particle size having a size of 1 μm to 5 μm or less were used to give high strength.

Such cement is 50% by weight to 60% by weight, the strength is lowered if the composition ratio is lower or higher than this.

In addition, the silica sand is used by combining the silica sand of No. 6 particle size (O.6mm or less) 30% to 50% by weight, the silica sand of No. 7 particle size (0.3mm or less) in a ratio of 50% to 70% by weight, As the silica sand ratio of No. 7 particle size increases, the workability of grout material tends to fall.

The silica sand prepared in this way is 35 to 45 weight%.

In addition, the aluminate as the expandable material is 0.10% by weight to 0.15% by weight, the expansion effect is lowered below this range and difficult to control due to excessive expansion above this range.

In addition, in the present invention, naphthalene is used in an amount of 0.25 wt% to 0.4 wt%, and silica calcium is used in an amount of 0.2 wt% to 0.4 wt% for controlling aggregate density.

Naphthalene and silica calcium used as such a density control agent is low in strength because the pores of the aggregates increase and the density decreases outside the range.

In addition, in the present invention, the sodium bentonite is used, which is 1.5% by weight to 2.4% by weight, and when it is out of this composition range, the pores are not very good and the strength is lowered.

The sodium bentonite absorbs a large amount of water, expands to several times its original volume, and becomes gel-like, densely forming pores of the composition aggregate, thereby preventing leakage and improving strength, thereby contributing to crack prevention.

In addition, in the present invention, the natural rubber powder is 2.5% by weight to 2.9% by weight, the elasticity is insufficient in this range or less can not prevent cracking, if the above range is more elasticity is improved but the strength is lowered.

In the present invention, cement, silica sand, aluminate, naphthalene, silica calcium, bentonite powder, and natural rubber powder are prepared in the above composition ratio.

In this way, after preparing a powder preparation, a liquid preparation is prepared.

The liquid formulation of the present invention is as follows.

First, a liquid acrylic resin is prepared at 17 wt% to 23 wt% as a coating agent.

When the liquid acrylic resin is less than the composition range, the coating strength is insufficient, and the effect of preventing the separation of aggregates is reduced. When the liquid acrylic resin is more than the composition range, the adhesion between the aggregates is lowered and the strength is lowered, so that the waterproofness is rather deteriorated.

In addition, 42 wt% to 52 wt% of water is prepared. In this range, there is a risk that the aggregates are separated as the expansion rate is low due to lack of moisture and the expansion rate is excessively high above this range.

In addition, the EVA polymer as a flocculant is used for the separation of the aggregate is prepared by 7% by weight to 8% by weight, the cohesive force is lowered below this range, the strength is lowered above this range.

In addition, the fat and oil used to reinforce the waterproof performance can be used as raw materials, such as animal fats such as pork fat, tallow, or coconut oil, which is prepared from 1.3% by weight to 1.7% by weight. If it is below this composition range, the waterproof effect is low, and if it exceeds this range, strength will fall.

In addition, 2.4 wt% to 2.6 wt% of surfactant and 17 wt% to 23 wt% of lignin are prepared as a fluidizing agent used to secure injection workability. The workability during injection deteriorates and excessive time is required for curing the grout above this range, and in severe cases, the aggregate is likely to separate. In this way, in the present invention, the powder preparation and the liquid preparation are prepared separately, and the powder preparation and the liquid preparation prepared in this way are transported to a separate container on site, and then 60 wt% to 85 wt% of the powder preparation and 15 wt% to the liquid preparation. After mixing and stirring to 40% by weight, it is immediately injected by a known injector into the cavity of the building structure, which is a well-known technique, and thus detailed description thereof will be omitted.

Hereinafter, specific embodiments of the present invention will be described.

Example 1

Prepare a powder formulation of 52.88% by weight of cement, 42% by weight of silica, 0.12% by weight of aluminate, 0.4% by weight of naphthalene, 0.2% by weight of silica, 1.5% by weight of bentonite, and 2.9% by weight of natural rubber powder,

17 wt% of liquid acrylic resin, 49.3 wt% of water, 7 wt% of EVA polymer, 1.3 wt% of fat and oil, 2.4 wt% of surfactant, and 23 wt% of lignin are prepared.

70 wt% of these powder materials and 30 wt% of liquid were mixed, stirred, injected into the cavity of the building, cured, and the compressive strength, expansion ratio, and condensation time were measured. The results are shown in [Table 1]. ] Is the same.

TABLE 1

Test Items unit Rebirth (Sun)  Measures Compressive strength kgf / cm ² 28 610 Expansion rate % 28 0.025 Cracking, Leaking 28 radish Setting time First minute 185 Termination (minutes) 260

Therefore, this compressive strength is about 10% higher than that of conventional grout agents.

The setting time was also reduced by about 20% compared with the conventional one, and no cracking or leakage was observed.

Example 2

Prepare a powder formulation of 50% by weight cement, 44.55% by weight silica, 0.1% by weight aluminate, 0.25% by weight naphthalene, 0.2% by weight silica, 2.4% by weight bentonite, 2.5% by weight natural rubber powder,

17 wt% of liquid acrylic resin, 49.3 wt% of water, 7 wt% of EVA polymer, 1.3 wt% of oil and fat, 2.4 wt% of surfactant, and 23 wt% of lignin are prepared.

70 wt% of these powders were mixed, 30 wt% of the liquid was mixed, stirred, injected into the cavity of the building, cured, and the compressive strength, expansion ratio, and condensation time were measured. The results are shown in [Table 2]. ] Is the same.

 TABLE 2

Test Items unit Rebirth (Sun)  Measures Compressive strength kgf / cm ² 28 606 Expansion rate % 0.028 Cracking, Leaking 28 radish Setting time First minute 195 Termination (minutes) 275

This compressive strength is slightly reduced than in the case of Example 1, which is a result of increasing the bentonite content, reducing the amount of cement used, increasing the amount of silica sand, but an excellent level improved by about 10% compared to conventional grout agents,

The setting time was also reduced by about 20% compared with the conventional one, and no cracking or leakage was observed.

Example 3

Prepare a powder formulation of 53.28 wt% cement, 42 wt% silica sand, 0.12 wt% aluminate, 0.4 wt% naphthalene, 0.2 wt% silica, 1.5 wt% bentonite, 2.5 wt% natural rubber powder,

23 wt% of liquid acrylic resin, 49.3 wt% of water, 7 wt% of EVA polymer, 1.3 wt% of fat and oil, 2.4 wt% of surfactant, and 17 wt% of lignin are prepared.

After mixing and stirring 70% by weight of these powder materials and 30% by weight of the liquid, the mixture was injected into the cavity of the building, cured, and the compressive strength, expansion ratio, and condensation time were measured. ] Is the same.

 TABLE 3

Test Items unit Rebirth (Sun)  Measures Compressive strength kgf / cm ² 28 607 Expansion rate % 28 0.025 Cracking, Leaking 28 radish Setting time First minute 184 Termination (minutes) 267

Therefore, this compressive strength is about 10% higher than that of conventional grout agents.

The setting time was also reduced by about 20% compared with the conventional one, and no cracking or leakage was observed.

In Examples 1, 2, and 3, even when a long time elapses by the natural rubber powder, the deformation caused by the partial stress variation is absorbed by the natural rubber powder, thereby preventing the occurrence of cracks and maintaining a stable construction state.

Leakage prevention performance is greatly improved by the gap filling function between the aggregate particles by bentonite, it is possible to prevent the aggregate is separated and lost in the construction process by the liquid acrylic resin.

Comparative Example 1

Prepare a powder formulation of 54.78 wt% cement, 42 wt% silica sand, 0.12 wt% aluminate, 0.4 wt% naphthalene, 0.2 wt% silica, 2.5 wt% natural rubber powder,

23 wt% of liquid acrylic resin, 49.3 wt% of water, 7 wt% of EVA polymer, 1.3 wt% of fat and oil, 2.4 wt% of surfactant, and 17 wt% of lignin are prepared.

70 wt% of these powders were mixed, 30 wt% of the liquid was mixed, stirred, injected into the cavity of the building, cured, and the compressive strength, the expansion ratio, and the condensation time were measured. ] Is the same.

TABLE 4

Test Items unit Rebirth (Sun)  Measures Compressive strength kgf / cm ² 28 608 Expansion rate % 28 0.025 crack 28 radish Leak 28 observation Setting time First minute 197 Termination (minutes) 290

In this comparative example the compressive strength was increased by about 10% compared to the grout agents according to the present invention,

Leaks were observed with the exclusion of bentonite.

Comparative Example 2

Prepare a powder formulation of 53.28 wt% cement, 44.5 wt% silica, 0.12 wt% aluminate, 0.4 wt% naphthalene, 0.2 wt% silica, 1.5 wt% bentonite,

23 wt% of liquid acrylic resin, 49.3 wt% of water, 7 wt% of EVA polymer, 1.3 wt% of fat and oil, 2.4 wt% of surfactant, and 17 wt% of lignin are prepared.

70 wt% of these powder materials and 30 wt% of liquid were mixed, stirred, injected into the cavity of the building, cured, and the compressive strength, expansion ratio, and condensation time were measured. The results are shown in [Table 5]. ] Is the same.

TABLE 5

Test Items unit Rebirth (Sun)  Measures Compressive strength kgf / cm ² 28 607 Expansion rate % 28 0.025 crack Occur Leak radish Setting time First minute 184 Termination (minutes) 267

Therefore, this compressive strength is about 10% higher than the grout agents according to the present invention,

As a result of the exclusion of the use of natural rubber powder, fine cracks were observed.

Comparative Example 3

Prepare a powder formulation of 53.28% by weight cement, 42% by weight silica, 0.12% by weight aluminate, 0.4% by weight naphthalene, 0.2% by weight silica, 1.5% by weight bentonite, 2.5% by weight natural rubber powder,

Prepare a liquid of 62.3 wt% water, 7 wt% EVA polymer, 1.3 wt% oil and fat, 2.4 wt% surfactant, 27 wt% lignin,

70 wt% of these powders were mixed, 30 wt% of the liquid was mixed, stirred, injected into the cavity of the building, cured, and the compressive strength, expansion ratio, and condensation time were measured. ] Is the same.

 TABLE 6

Test Items unit Rebirth (Sun)  Measures Compressive strength kgf / cm ² 28 607 Expansion rate % 28 0.025 crack 28 observation Leak radish Setting time First minute 184 Termination (minutes) 267

Therefore, this compressive strength is about 10% higher than the grout agents according to the present invention,

As a result of excluding the use of the acrylic resin, the aggregates were separated, and the strength degradation and fine cracking were observed as compared with Examples 1, 2 and 3.

In this way, unlike the conventional grouting agent, the present invention is capable of providing excellent construction quality without cracking even after a long period of time of construction, and sodium bentonite which becomes a gel between aggregate particles expanded by aluminate. By dense filling, it has excellent leakage preventing performance and liquid acrylic resin wraps and coats powder cement and its mixture, so that the aggregate is provided before and after condensation to prevent the aggregate from separating and maintain waterproof performance. In other words, there is a useful effect that the high strength can be developed to a sufficient degree for the maintenance of the facility structure.

Claims (5)

50% to 60% by weight of cement, 35% to 45% by weight of silica sand, 0.10% to 0.15% by weight of aluminate, 0.25% to 0.4% by weight of naphthalene, 0.2% to 0.4% by weight of silica, sodium Powder material comprising 1.5% to 2.4% by weight of bentonite, 2.5% to 2.9% by weight of natural rubber powder, 17% to 23% by weight of liquid acrylic resin, 42% to 52% by weight of water, 7% to 8% by weight of EVA polymer as liquid coagulant, 1.3% to 1.7% by weight of fat and oil, 19.4% to 25.6 fluidizing agent In the composition which mixed the liquid solution which consists of weight% (2.4 weight%-2.6 weight% surfactant, 17 weight%-23 weight% lignin), The above composition is prepared by mixing 60 wt% to 85 wt% of the powder and 15 wt% to 40 wt% of the above-mentioned liquid formulation, The above-mentioned powdered cement is composed of 90% by weight of cement having a particle diameter of more than 5 µm and 15 µm or less, and 10% by weight of cement having a particle diameter of 1 µm to 5 µm or less. A grout composition comprising 30 to 50% by weight of silica sand having a particle size (0.6 mm or less) and silica sand of No. 7 particle size (0.3 mm or less) in a ratio of 50 to 70% by weight. delete delete delete delete