KR101530830B1 - Grout filler and grouting method using the grout filler - Google Patents

Abstract

The present invention relates to a grout filler and a grouting method using the same and, more specifically, to a two-component grout filler, which has a solution A with cement, water and curing agents and a solution B with an expression agent for expressing initial strength, water and a curing promoting agent, and accordingly has a plasticizing phase when starting construction, and to a grouting method using the same. The present invention relates to a grout filler, which has initial strength and durability while exhibiting stable tendency in strength properties after being used for destroying initial gel, has a low volume reduction ratio due to not performing drying and atmospheric curing, maintains high compression strength, and has excellent economic feasibility, and to a grouting method using the same.

Description

TECHNICAL FIELD [0001] The present invention relates to a grout filling material and a grouting method using the grout filling material.

More particularly, the present invention relates to a grout filling material and a grouting method using the grout filling material. More particularly, the present invention relates to a grout filling material and a grouting method using the grout filling material and the grouting method using the grout filling material. And a grouting method using the grout filling material.

Generally, grouting is also called grouting. The grouting is filled with self-weight or pump, and cracks generated in the structure of the civil engineering construction field and the gap between the bottom plate of the mechanical equipment and the foundation concrete of the structure are filled, The present invention is to stably support the mechanical equipment and to fill in gaps occurring in mechanical equipment or structures, and to absorb various vibrations and stress uniformly to maintain the life of the structure for a long period of time.

In order to prevent the occurrence of cavities in the interface between the civil engineering structures and the ground in the process of civil engineering work such as tunnel excavation or underground excavation, or to prevent a large gap or sweep in the ground, Cement milk or silicate-based grout has been injected and filled. However, as described above, a simple one-component cement milk ground filler can not maintain viscosity and strength over a certain level before being completely cured after injection, and is easily diluted or lost by groundwater.

In order to improve the injection effect and quality in recent years, a preliminary grout has been used as a ground filler. Unlike general cement-based injection materials, such plastic grout has fluidity due to low viscosity when injected into a cavity, but since the viscosity gradually increases at a constant level over a certain period of time, (Plasticity). Therefore, not only is it possible to fill the fine space by pressurization, but also after the viscosity has risen over a certain period of time, it exhibits a certain level of strength or more, so that it is not easily lost by the groundwater even after charging into the cavity. A method of combining bentonite and sodium silicate in cement milk is known as the above-mentioned calcined grout material. However, in the case of an injection material in which cement milk is mixed with bentonite and sodium silicate, there is a problem that durability is deteriorated over time due to alkali leaching caused by use of sodium silicate.

It is known to combine cement milk with an aluminum salt or a clay mineral based filler as another firing-like grout material, and Korean Patent Laid-Open Publication No. 2001-0090686 discloses a fired-in-place grout in which cement milk and a basic alumina sulfate solution are combined . However, when the cement milk is mixed with the basic alumina sulfate solution, there is a problem in that its application is limited because it can not reach the level required in the related art in terms of the tentative phase retention time, viscosity characteristics and early strength development.

In addition, Korean Patent No. 10-0402456 discloses a pretreatment method of neutral silica sol (silica (silica), silica gel, silica gel, etc.), which is characterized in that it has characteristics of a plastic phase with good permeability to the ground for the purpose of reinforcement and ordering of the ground, Colloid) is used. However, since the neutral silica sol is combined with fine particle cement and fine particle slag having a specific surface area of 4,000 cm 2 / g or more and sodium bicarbonate is used as a viscosity time adjusting agent, it is excellent in ultimate strength and durability but has a long viscosity increase time and early strength low. Therefore, although it is suitable as a ground settlement which penetrates into the ground and is integrated with the soil, there is a problem that it is not suitable for direct application to a lining back surface injection material and a cavity filling material of a shield tunnel.

Korean Patent Publication No. 2001-0090686 Korean Patent No. 10-0402456

The present invention relates to a liquid grout, wherein the liquid A comprises cement, water and a curing aid, and the liquid B is composed of an initial strength agent, water and a curing accelerator, and exhibits excellent early strength development and durability at the time of construction, And it is an object of the present invention to provide a grooved filling material having a low volume reduction rate and a high compression strength and being economical, and a grouting method using the same.

The present invention, in one aspect,

20 to 40% by weight of the liquid A and an initial strength agent of 20 to 40% by weight of cement, 55 to 75% by weight of water and 1 to 10% by weight of curing auxiliary agent, 50 to 70% by weight of water and 5 to 15% by weight of curing accelerator % Of the B liquid is mixed at a ratio of 1: 0.5 to 2.

According to another aspect of the present invention,

Setting the drilling hole, confirming the injection position of the grout filler, and planning and preparing the injection amount; An injection hole drilling step for injecting the grout filler set in the work plan; An injection tube installation step for injecting the grout filler into voids, cavities and cracks of the fingerboard; 20 to 40% by weight of the liquid A and an initial strength agent of 20 to 40% by weight of cement, 55 to 75% by weight of water and 1 to 10% by weight of curing auxiliary agent, 50 to 70% by weight of water and 5 to 15% by weight of curing accelerator % Of B liquid are mixed with each other; Injecting the grout filler mixed and mixed at a ratio of 1: 0.5 to 2 at the injection port by feeding the mixed solution A and the solution B by respective separate injection pumps; Confirming the amount of injection through pressure; And a step of curing and finishing after confirming an injection amount of the grout filling material. The present invention also provides a grouting method using the grout filling material.

Accordingly, the present invention is to provide a cement mortar composition which not only exhibits excellent early strength development and durability but also tends to be stable in strength characteristics due to initial gel breakage, has a low volume reduction rate due to no curing and drying in air, A filler and a grouting method using the filler can be provided.

1 is a schematic view of a grouting method using a grout filling material according to the present invention.

20 to 40% by weight of the liquid A and an initial strength agent of 20 to 40% by weight of cement, 55 to 75% by weight of water and 1 to 10% by weight of curing auxiliary agent, 50 to 70% by weight of water and 5 to 15% by weight of curing accelerator % Of the B liquid is mixed at a ratio of 1: 0.5 to 2.

Hereinafter, the present invention will be described in more detail.

The cement can strengthen the strength of the grout filler. If the content of the cement exceeds the above range, it is difficult to achieve a certain strength.

The cement may be ordinary cement, for example, ordinary cement such as Portland cement

The curing aid preferably comprises anhydrous gypsum (CaSO ₄ ), calcium hydroxide (Ca (OH) ₂ ) and calcium silicate minerals.

The anhydrous gypsum is characterized by rapid solidification with calcium sulfate, and if the content is in the above range, the solidification action is slowed and the initial strength development is difficult.

The calcium hydroxide is hydrated by the pozzolanic reaction when mixed with water to form calcium silicate hydrate and calcium aluminate hydrate. If the content of calcium hydrate falls below the above range, the strength of hydrated lime is lowered due to the pozzolanic reaction.

The calcium silicate compound is preferably C ₂ S or C ₃ S, and may be used in combination for controlling the curing rate and strength.

The C ₂ S or C ₃ S reacts with water to produce calcium hydroxide and calcium silicate hydrate. More specifically C ₂ or C ₃ S S is Ca ^{2 +} is eluted reacted with water in a liquid state is a high alkali, it reaches a supersaturated calcium hydroxide crystals are precipitated at the same time (SiO ₄₎ ⁴⁺ hydroxide silicate ions (Si (OH) ₆ ) ^{2 -} , and calcium silicate hydrate (CSH) is formed by bonding with Ca ^{2 +} around C ₂ S or C ₃ S particles. This hydrate is a gelatinous, low-crystalline substance whose chemical composition changes depending on the degree of hydration.

It is preferable that the hydration reactant does not shrink even after curing because it is larger in volume than the original unreinforced mineral.

Also, 24 hours after the initial hydration reaction, hydration reaction of C ₃ S or C ₂ S, which is a calcium silicate mineral, is continuously performed to generate calcium silicate hydrate in gel state, so that rod and plate calcium aluminate sulfate hydrate The structure can be densely packed so that the cured body can cancel the shrinkage phenomenon for the Etrringite reaction and expansion.

The initial strength agent may include epoxy resin 5 to 25 wt% iron oxide (Fe ₂ O ₃ ) 40 to 60 wt%, aluminum oxide (Al ₂ CO ₃ ) 5 to 15 wt%, sodium oxide (Na ₂ O) 5 to 10 Wherein the epoxy resin contains 4 to 8% by weight of the epoxy resin, 3 to 8% by weight of titanium oxide (TiO ₂ ), 0.5 to 5% by weight of calcium oxide (CaO) and 3 to 8% by weight of silicon oxide (SiO ₂ ) The mixture of (chloromethyl) oxylane and 4.4- (1-methylethylidene) bisphenol polymer in an amount of 85 to 90% by weight, N-butyl glycidyl ether in an amount of 5 to 10% by weight, And 1 to 5% by weight of short chain chlorinated paraffins (C = 10 to 13), and the curing agent of the epoxy resin is a mixture of 2,4,6-tris [(dimethylamino) methyl] phenol and bis (dimethylaminomethyl) 1 to 5% by weight of the mixture, 80 to 90% by weight of amido-amine resin and 7 to 16% by weight of triethylenetetramine.

If the composition ratio of the components of the initial strength agent is out of the above range, the gel formation may be insufficient or the shortening effect of the initial gel formation time may not be exerted, and the plasticity and strength characteristics of the grout injection material may be adversely affected It is not preferable.

The curing accelerator of the present invention comprises 15-25% by weight of aluminum silicate (Al ₂ (SiO ₃ ) ₃ ), 25-35% by weight of synthetic alumina silicate (Al ₂ O ₃ .9SiO ₂ .XH ₂ O), potassium carbonate K 10 to 20% by weight of sodium carbonate (Na ₂ CO ₃ ), 10 to 20% by weight of sodium sulfate (NaSO ₄ ) and 5 to 15% by weight of iron chloride (FeCl ₂ · 7H ₂ O) .

The aluminum silicate is used as a filler and exhibits an excellent effect on abrasion resistance. If the aluminum silicate is used more than this, the unit price becomes high, and when it is used less, satisfactory wear resistance can not be seen.

The synthetic alumina silicate can remove the alkali catalyst with powder having excellent flowability, and if the content is in the range, the flowability can be reduced.

The potassium carbonate can control the pH with a neutralizing agent. If the content of the potassium carbonate falls outside the above range, it is difficult to expect proper maintenance of the pH of the grout filler.

The sodium sulfate is mainly characterized by rapid solidification, and if the content is in the above range, the solidification action is slowed and the initial strength is difficult to manifest.

It is preferable that the iron chloride is contained in a small amount and it is preferable to neutralize the cement toxicity in the process of high PH aggregation range and solidification.

The liquid system according to the present invention is carried out by a method in which the liquid A and the liquid B are respectively fed by a separate injection pump and then the liquid A and the liquid B are mixed and mixed in the vicinity of the injection port and then injected into a cavity or the like. At this time, it is preferable that the liquid A and the liquid B are blended in a weight ratio of the liquid A and the liquid B of 1: 0.5 to 2, preferably 1: 1 in view of maintenance of a suitable viscosity, excellent strength development and easy workability.

If a grouting operation is performed in which the solution A and the solution B are simultaneously injected into a cavity or cracks in the ground through a grouting machine, a condensation step of maintaining a calcined state for a predetermined period of time is not performed until the short- do.

In the condensation step, an initial gel that absorbs groundwater is formed on the surface of the grout by chemical reaction between the grout and the groundwater, and the soil water property is improved by reducing the water content of the ground. Even after the initial gel is broken, It is preferable that the alumina and alumina silicate of the curing accelerator (Al ₂ (SiO ₃ ) ₃ ), the synthetic alumina silicate and the curing aid mixture have a preliminary phase and can reform the gel.

The grout filler formed through the above reaction is capable of expressing the early strength, and the calcium hydroxide, silica, and alumina oxide produced by the hydration reaction from the mid- to long- The CSH gel hermetically closes the pores of the cured body to make the structure of the cured body more dense by performing the pozzolanic reaction that slowly reacts at room temperature to generate the insoluble compound CSH gel. In addition, since the initial strength agent includes iron oxide and epoxy resin that improve the long-term strength, it is preferable that the initial strength agent can increase the strength secondarily.

According to a further aspect of the present invention,

Setting the drilling hole, confirming the injection position of the grout filler, and planning and preparing the injection amount;

An injection hole drilling step for injecting the grout filler set in the work plan;

An injection tube installation step for injecting the grout filler into voids, cavities and cracks of the fingerboard;

20 to 40% by weight of the liquid A and an initial strength agent of 20 to 40% by weight of cement, 55 to 75% by weight of water and 1 to 10% by weight of curing auxiliary agent, 50 to 70% by weight of water and 5 to 15% by weight of curing accelerator % Of B liquid are mixed with each other;

Injecting the grout filler mixed and mixed at a ratio of 1: 0.5 to 2 at the injection port by feeding the mixed solution A and the solution B by respective separate injection pumps;

Confirming the amount of injection through pressure; And

And a step of curing and finishing after confirming the amount of the grout filling material.

Preferably, the work plan and the work preparation step include planning and preparing a pore diameter setting for injecting the grout filler, confirming the injection position of the grout filler, and preparing the injection amount.

In the injection hole drilling step, it is preferable to drill the injection hole according to the injection hole set in the operation plan step.

Preferably, the injection tube installation step is provided with an injection tube for injecting grout filler material to a site where the grout filler material can be used to reinforce the strength such as voids, cavities, cracks and the like of the fingerboard and increase the bonding force.

The injection tube is usually pumped by applying a low pressure of 20 Kg / cm ² or less by using a tube capable of charging a grout filler material, and using a pressure grooming method by applying a high pressure .

The grout designing step may include designing 20 to 40% by weight of the liquid A and 20 to 40% by weight of water, 50 to 70% by weight of water, and 20 to 40% by weight of the initial strength agent comprising 20 to 40% by weight of cement, 55 to 75% by weight of water and 1 to 10% And 5 to 15% by weight of a curing accelerator.

In the step of injecting the grout filler, it is preferable that the liquid A and the liquid B mixed in the above step are respectively fed by separate injection pumps and are mixed and mixed at a ratio of 1: 0.5 to 2 at the injection port.

The injection amount checking step can confirm the injection amount by measuring the pressure.

It is preferable that the curing and finishing step cures within 7 days to 28 days after confirming the injection amount so that the grout filling material can further strengthen the strength and increase the bonding force.

<Examples>

Hereinafter, the present invention will be described more specifically by the following representative examples, but the present invention is not limited in any way by these embodiments.

Example 1: Preparation of liquid A

The compositions were placed in a mixing vessel according to the composition shown in Table 1 below, mixed at room temperature for 30 minutes, and reacted to prepare Solution A.

Composition table according to blending amount    ingredient Example (content, g) One cement 29.8 water 67.1 Hardening aid 3.1

Examples 2-1 to 4: Preparation of liquid B

The compositions were put into a mixing vessel according to the composition shown in Table 2 below, mixed at room temperature for 30 minutes, and reacted to prepare solution B.

Composition table according to blending amount    ingredient Example (content, g) 2-1 2-2 2-3 2-4 Initial strength agent 20 35 40 32 water 70 50 59 62 Hardening accelerator 10 15 One 6

Test Example 1-4: Physical Test of Grout Filler

The liquids A and B prepared in accordance with the compositions shown in Example 1 and Examples 2-1 to 4 were fed by respective separate injection pumps and mixed with liquid A and liquid B at a ratio of 1: After injection into the cavity, the property test was carried out according to the test method of KS F 4044 (hydraulic cement shrinkage grout). As a result, test results as shown in the following Table 3 were obtained.

Test Items Test Example Remarks One 2 3 4 Flowability (mm) 30 minutes 239 265 233 228 60 minutes 241 259 239 234 225 or more Compressive strength (N / mm ² ) 1 hours 242 332 291 292 1 day 12 14 13 12 7 or more 7 days 61 65 62 63 24 or more 28th 81 82 82 83 35 or more

As shown in Table 3, the grout filler formed using the composition satisfying the grout filler of the present invention has high compressive strength and good fluidity.

Claims (8)

20 to 40% by weight of the liquid A and an initial strength agent of 20 to 40% by weight of cement, 55 to 75% by weight of water and 1 to 10% by weight of curing auxiliary agent, 50 to 70% by weight of water and 5 to 15% by weight of curing accelerator % Of B solution is mixed in a ratio of 1: 0.5 to 2,
The curing aid comprises 40 to 60 wt% of anhydrous gypsum (CaSO ₄ ), 20 to 40 wt% of calcium hydroxide (Ca (OH) ₂ ) and 10 to 30 wt% of calcium silicate mineral,
The curing accelerator is an aluminum silicate _{(Al 2 (SiO 3) 3} ) 15 ~ 25 wt%, synthetic alumina silicate _{(Al 2 O 3 · 9SiO 2} · XH 2 O) 25 ~ 35 weight%, potassium carbonate (K ₂ CO ₃ ) 10-20 wt%, sodium sulfate (NaSO ₄ ) 10-20 wt%, and iron chloride (FeCl ₂揃 7H ₂ O) 5-15 wt%. delete The method according to claim 1,
The initial strength agent may include epoxy resin 5 to 25 wt% iron oxide (Fe ₂ O ₃ ) 40 to 60 wt%, aluminum oxide (Al ₂ CO ₃ ) 5 to 15 wt%, sodium oxide (Na ₂ O) 5 to 10 (TiO ₂ ) 3 to 8% by weight, calcium oxide (CaO) 0.5 to 5% by weight and silicon oxide (SiO ₂ ) 3 to 8% by weight,
The epoxy resin is prepared by mixing a base and a curing agent in a ratio of 4-6: 1,
The subject of the epoxy resin is 85-90% by weight of (chloromethyl) oxylane and 4.4- (1-methylethylidene) bisphenol polymer, 5-10% by weight of N-butyl glycidyl ether, and short chain chlorinated paraffin To 13) 1 to 5% by weight,
The curing agent of the epoxy resin is preferably selected from the group consisting of 1 to 5 wt% of a mixture of 2,4,6-tris [(dimethylamino) methyl] phenol and bis (dimethylaminomethyl) phenol, 80 to 90 wt% And 7 to 16% by weight of tetramine. delete In the grouting method using two-component grout,
Setting the drilling hole, confirming the injection position of the grout filler, and planning and preparing the injection amount;
An injection hole drilling step for injecting the grout filler set in the work plan;
An injection tube installation step for injecting the grout filler into voids, cavities and cracks of the fingerboard;
20 to 40% by weight of the liquid A and an initial strength agent of 20 to 40% by weight of cement, 55 to 75% by weight of water and 1 to 10% by weight of curing auxiliary agent, 50 to 70% by weight of water and 5 to 15% by weight of curing accelerator % Of B liquid are mixed with each other;
Injecting the grout filler mixed and mixed at a ratio of 1: 0.5 to 2 at the injection port by feeding the mixed solution A and the solution B by respective separate injection pumps;
Confirming the amount of injection through pressure; And
And curing and finishing after confirming the amount of grouting. 6. The method of claim 5,
Wherein the curing aid comprises 40 to 60 wt% of anhydrous gypsum (CaSO ₄ ), 20 to 40 wt% of calcium hydroxide (Ca (OH) ₂ ) and 10 to 30 wt% of a calcium silicate mineral Grouting method. 6. The method of claim 5,
The initial strength agent may include epoxy resin 5 to 25 wt% iron oxide (Fe ₂ O ₃ ) 40 to 60 wt%, aluminum oxide (Al ₂ CO ₃ ) 5 to 15 wt%, sodium oxide (Na ₂ O) 5 to 10 (TiO ₂ ) 3 to 8% by weight, calcium oxide (CaO) 0.5 to 5% by weight and silicon oxide (SiO ₂ ) 3 to 8% by weight,
The epoxy resin is prepared by mixing a base and a curing agent in a ratio of 4-6: 1,
The subject of the epoxy resin is 85-90% by weight of (chloromethyl) oxylane and 4.4- (1-methylethylidene) bisphenol polymer, 5-10% by weight of N-butyl glycidyl ether, and short chain chlorinated paraffin To 13) 1 to 5% by weight,
The curing agent of the epoxy resin is preferably selected from the group consisting of 1 to 5 wt% of a mixture of 2,4,6-tris [(dimethylamino) methyl] phenol and bis (dimethylaminomethyl) phenol, 80 to 90 wt% Tetramine is mixed with 7 to 16% by weight of the grouting filler. 6. The method of claim 5,
The curing accelerator is an aluminum silicate _{(Al 2 (SiO 3) 3} ) 15 ~ 25 wt%, synthetic alumina silicate _{(Al 2 O 3 · 9SiO 2} · XH 2 O) 25 ~ 35 weight%, potassium carbonate (K ₂ CO ₃ ) 10 to 20% by weight, sodium sulfate (NaSO ₄ ) 10 to 20% by weight and iron chloride (FeCl ₂ · 7H ₂ O) 5 to 15% by weight based on the total weight of the grouting filler.

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