KR20210026423A - Crack repair material and method of waterproofing using thereof - Google Patents

Abstract

The present invention provides a crack repairing agent in which a first main agent comprising a carboxylated styrene butadiene random copolymer resin and a tackifier, and at least one second main agent selected from the group consisting of cement, silica, fly ash, and mortar are mixed at a weight ratio of 8:2 to 4:6 with water at a weight ratio of 3:7 to 4:3. The mortar is mixed with 0.1 to 0.5 wt% of a powder in which silica, fly ash, portland cement, silica, fly ash, a dispersant, a crack preventing agent, a fluidizing agent, an emulsifying agent, and the like are mixed. In addition, the present invention provides a crack repairing method comprising: a step of sanding the bottom surface of a concrete structure, a brick masonry structure, a stone, and the like to be constructed, and performing V-cutting and cleaning cleanly when the crack is 3 mm or more; a step of forming a bottom by using a commercially available primer; a step of manufacturing a crack repairing agent by mixing a first main agent comprising a carboxylated styrene butadiene random copolymer resin and a tackifier after coating the primer, and water, wherein the main agent is mixed with at least one second main agent selected from the group consisting of cement, silica, fly ash, and mortar at a weight ratio of 8:2 to 4:6, at a weight ratio of 3:7 to 7:3; a step of repairing a crack region by means of injecting, coating, and the like into the crack region; a step of forming a medium degree and a phase by using a commercially available medium and a top agent; and a step of curing for a certain time after the top. According to the present invention, provided is a crack repairing agent suitable for various types of crack repairing because viscosity can be easily adjusted.

Description

Crack repair material and method of waterproofing using thereof

The present invention not only can easily repair cracks (cracks) generated in concrete structures, as well as air pockets generated during concrete pouring, but also prevents cracks and fractures, thereby semi-permanently repairing cracks repaired by deformation and vibration of the structure. The present invention relates to a crack repair agent that can be maintained and has excellent workability, and a crack repair method using the same.

In general, concrete buildings are composed of reinforcing bars with excellent tensile strength as a skeleton and filled with concrete with excellent durability and compressive strength. In other words, the reinforced concrete structure is a structural method that reasonably complements the unique characteristics of each material by combining concrete that is strong in compressive force and reinforcing bar that is strong in tensile strength, and because alkaline concrete forms a passivation film on the reinforcing bar, it suppresses the corrosion progression. It is an excellent rescue method that can take over 100 years.

Concrete buildings are reasonably efficient building materials that combine the characteristics of each material, but in recent years, air pollution due to global warming is intensifying, and as environmental changes are increasing, concrete buildings have intensified acid rain and temperature changes in the atmosphere, gases that cause air pollutants. Concrete buildings are rapidly deteriorated or affected by deterioration due to vibration aftermath caused by construction due to redevelopment projects, resulting in a decrease in durability.

The aging of concrete buildings promotes deterioration as well as peeling of the coating film, which can cause cracks in concrete buildings, and when cracks occur, the cracks spread out like a domino phenomenon. In addition, deterioration causes neutralization (carbonization) of concrete and corrodes reinforcing bars. Normally, the neutralization of concrete buildings proceeds slowly, so there is no big problem, but rainwater or other pollutants flow into the crack area due to the crack, further accelerating the neutralization to promote the corrosion of the rebar. Moreover, if moisture infiltrates into the cracks, bacteria such as mold grow and erosion.

As a construction method for repairing and reinforcing cracks occurring in concrete buildings, the method of applying cracks with crack repairing materials such as urethane or epoxy putty or sealant is mainly used, but it is finally used after rust prevention and antibacterial construction and crack repair construction are completed. A method of repairing cracks in consideration of adhesion to water-based paints or waterproofing agents applied as is required.

When the crack repair material is applied as a general method for repairing cracks in concrete buildings, when the depth of the crack is large, the crack repair material does not completely fill the crack area and generates an unpleasant odor, resulting in poor workability and uneven base surface. There are problems in that uniform application is difficult, shrinkage and depression of the crack repair material along with drying of the crack repair material, and the crack repair effect are not satisfactory.

In particular, if an epoxy or urethane-based repair agent is used in areas exposed to reinforcing bars due to deep neutralization of concrete, the exposed reinforcing bars are further corroded due to the low pH (acidity) of the repair agent itself and the generation of a lot of carbon dioxide (CO2) during hardening. , At the time of renovation, there was a problem that the neutralization area around the reinforcing bar was enlarged.

In order to solve the above problems, Patent No. 10-1031067 describes the reinforcement of reinforced concrete structures by selecting suitable quality crack repair agents and appropriate repair methods for waterproofing and painting the exterior walls of apartments, and completely repairing cracks at the present time. Waterproofing of the exterior walls of apartments, which prevents corrosion of reinforcement and neutralization of concrete by preventing rainwater inflow and contact of carbon dioxide (CO2) on the concrete surface as much as possible to protect and extend the maintenance life of the reinforced concrete structure structurally and safely. And a method of repairing a cracked film for painting.

However, in the conventional crack film repair method described in the above patent, if the exposed reinforcing bar corroded after pretreatment of the cracked portion is present, the first composition composed of 70 to 80% by weight of xylene and 20 to 30% by weight of polyolefin resin is exposed to rust prevention of the reinforcing bar. Although it is used as an undercoat material, xylene of the first composition is a hazardous substance to be managed that threatens kidney function, liver function, and central nervous system, and corresponds to a combustible toxic substance, and has aquatic and ecological toxicity, so it is desirable to repair cracks. It can't be the way.

On the other hand, Patent No. 10-0970004 describes a lightweight polymer cement repair mortar composition for repairing the cross section of concrete structures using lightweight ash, and Patent No. 10-0982469 discloses adhesion and abrasion resistance with inorganic binders having characteristics of ultra-fast diameter and ultra-rough steel. For emergency construction with ultra-fast hardness, ultra rough steel, rust-prevention, and antibacterial performance, which is a combination of organic polymer modifiers, alkoxysilane-based rust inhibitors that function as anti-rust of reinforcing bars, and metal oxide-based antibacterial ceramics that have antibacterial action. Although the mortar composition and the construction method of the concrete structure by the mortar composition have been proposed, the effect is not satisfactory, and the application is limited.

The object of the present invention to solve the above-described conventional problem is to provide a crack repair agent suitable for various types of crack repair because it is easy to adjust the viscosity.

In addition, the present invention provides a crack repair agent that has excellent adhesion to water-based and oil-based paints and waterproof paints, has excellent crack repair effect, excellent workability, uniform application, and low shrinkage, so that there is no risk of dents. It has a different purpose.

In addition, the present invention has another object to provide a crack repair method using the crack repair agent of the above objects.

In addition, it is an object of the present invention to provide a method for repairing cracks in concrete buildings using the above objects.

The object of the present invention is not limited to the above-mentioned object, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

The problem solving means to be solved by the present invention in order to achieve the above object is from the group consisting of a first subject consisting of a carboxylated styrene butadiene random copolymer resin and a tackifier, and cement, silica sand, fly ash and mortar. It provides a crack repair agent, characterized in that the selected at least one or more second theme is mixed in a weight ratio of 8: 2 ~ 4: 6, and water is mixed in a weight ratio of 3: 7 ~ 4: 3. The second subject is characterized in that 0.1 to 0.5% by weight of a powder obtained by mixing a dispersing agent, an anti-cracking agent, a fluidizing agent, an emulsifying agent, and an antifoaming agent is mixed.

In addition, the present invention sands the entire surface of the concrete structure, brick masonry structure, stone, etc. to be constructed using a grinder, but if the crack is 3 mm or more, V-cutting and cleaning cleanly, commercially available The step of forming a primer using a possible primer, the first subject consisting of a carboxylated styrene butadiene random copolymer resin and a tackifier after applying the primer, and selected from the group consisting of cement, silica sand, fly ash and mortar. A step of preparing a crack repair agent by mixing the main substance and water in which at least one second subject is mixed in a weight ratio of 8: 2 ~ 4: 6 using an electric mixer in a weight ratio of 3: 7 ~ 7: 3, the prepared crack repair agent The steps of repairing the crack area by filling the crack area by injection or application, etc., forming a middle coat and top coat using a commercially available intermediate coat agent and a top coat agent, and curing and curing for a certain period of time after the top coat are performed. A crack repair method is provided that includes.

In addition, the present invention sands the entire surface of the concrete structure, brick masonry structure, stone, etc. to be constructed using a grinder, but if the crack is 3 mm or more, V-cutting and cleaning cleanly, commercially available The step of forming a primer using a possible primer, the first subject consisting of a carboxylated styrene butadiene random copolymer resin and a tackifier after applying the primer, and selected from the group consisting of cement, silica sand, fly ash and mortar. A step of preparing a crack repair agent by mixing the main material and water in which at least one second subject is mixed in a weight ratio of 8: 2 ~ 4: 6 using an electric mixer in a weight ratio of 3: 7 ~ 7: 3. There is provided a method for repairing cracks comprising the steps of repairing the cracked area by filling the cracked area by a method such as injection or coating, and applying a commercially available aqueous or oil-based paint.

Specific matters for achieving the object of the present invention will become apparent with reference to the embodiments described below in detail.

The present invention is not limited to the embodiments disclosed below, but may be configured in a variety of different forms, and the present embodiments allow the disclosure of the present invention to be complete and those of ordinary skill in the art to which the present invention pertains. It is provided to fully inform the scope of the invention.

The viscosity of the present invention is easy to control, so it is suitable for repairing various types of cracks, has excellent adhesion to water-based and oil-based paints, and waterproof paints, has excellent crack repair effects, and has excellent workability and uniform application, and has excellent shrinkage. It is possible to obtain a crack repairing agent that does not have the risk of dents, and by using it, it is possible to easily obtain an excellent crack repairing effect by applying it to waterproofing and repairing exterior walls.

1 is a cross-sectional view for explaining a crack repair method using a crack repair agent according to the present invention.

Hereinafter, in describing in detail a preferred embodiment of the crack repair agent of the present invention and a crack repair method using the same, when it is determined that a detailed description of a related known function or configuration may obscure the gist of the present invention, the detailed description thereof will be omitted. do.

The crack repair agent of the present invention comprises a first subject consisting of a carboxylated styrene butadiene random copolymer resin and a tackifier, and at least one second subject selected from the group consisting of cement, silica sand, fly ash, and mortar. It is characterized in that the main body mixed in ~4:6 and water are mixed in a weight ratio of 3:7 ~7:3.

The carboxylated styrene butadiene random copolymer resin is a copolymer synthesized by copolymerizing a styrene monomer and a butadiene monomer. COOH) or a carboxyl salt (-COOM: M is a metal), and the monomer having a carboxyl group is in the range of 0.05% to 10% by weight based on the carboxylated styrene butadiene random copolymer.

The tackifier is at least one material selected from the group consisting of cellulose, gum, rosin, and terpene resin, and is preferably used in an amount of 1 to 20% by weight based on the weight of the carboxylated styrene butadiene random copolymer resin.

When the amount of the tackifier used is less than 1% by weight based on the weight of the carboxylated styrene butadiene random copolymer resin, there is a disadvantage that the adhesion of the prepared crack repair agent is weak, and when it exceeds 20% by weight, the formed coating film is There is a problem in that the elasticity is lowered.

The first subject consisting of the carboxylated styrene butadiene random copolymer resin and tackifier, and at least one second subject selected from the group consisting of cement, silica sand, fly ash and mortar are weight ratios of 8:2 to 4:6. The crack repair agent of the present invention is prepared by mixing the mixed main substance and water in a weight ratio of 3: 7 ~ 7: 3.

When the ratio of use of the first and second subjects and the mixing ratio of the subject and water are out of the above range, there is a problem that the function as a crack repair agent is markedly deteriorated.

The second subject may be a powder obtained by mixing 0.1 to 0.5% by weight of a dispersant, an anti-cracking agent, a fluidizing agent, an emulsifying agent, and an antifoaming agent.

The dispersant is water-soluble, and the evaporated moisture is consumed as the cement hydrate of the powder admixture when mixing the slurry.

A fluidizing agent (superplasticizer, superplasticizing admixture) is an admixture that significantly improves fluidity without changing the quality of blended or cured concrete. By adding a high-performance water reducing agent to the base concrete of relatively dough, only fluidity is not impaired. It is used as an admixture to improve workability by increasing it.

The superplasticizer used to disperse cement particles is a mixture to soften concrete and forms a lubricating film between the particles to reduce the mutual adhesion between the components, without changing the blending or the quality of the cured concrete. Fluidity is greatly improved, chemically stable, and high-strength concrete manufacturing is facilitated, and there is an effect of almost no slump loss.

<Construction method>

1 is a cross-sectional view illustrating a crack repair method using a crack repair agent according to the present invention, and as shown in FIG. 1(a), a structure such as a concrete structure, a brick masonry structure, and a stone to be constructed. The base surface 110 of (100) should be cleaned in advance so that there is no oil or dirt.

As shown in (b) and (c) of FIG. 1, the base surface 110 of the structure 100 is sanded (S) using a grinder so that there is no rust or oil, but the crack is 3 mm. V-cutting is performed on the abnormal area, and then a commercially available primer is applied.

After sanding the base surface 110 of the structure 100 with a grinder (S) and forming the undercoat layer 200, an electric mixer (about RPM 500) is used so that the crack repair agent is formed in a slurry form so that complete mixing is evenly achieved. Mix (3~5 minutes), and adjust the dough to suit the purpose of the work.

As shown in (d) of FIG. 1, the mixed crack repair agent 300 is effective to repair the crack area by repeatedly applying it at least once or more using a trowel, a brush, or a stiff waterproof rain, spatula, etc. to the crack area. to be

The method of filling the crack area with the crack repair agent of the present invention is not particularly limited, and all methods commonly used in the technical field to which the present invention pertains may be used, and a Hera was used in the present invention.

When filling the crack repair agent, the base surface 110 should be kept wet, and very dry or strong direct sunlight should be avoided. In addition, it is preferable to refrain from construction at 5°C or less.

After repairing the crack as shown in (e) and (f) of FIG. 1, a commercially available intermediate agent 400 and a top coating agent 500 are applied.

After the top coat 500, a certain period of time (2 to 6 hours) has elapsed, and it is completely cured to complete the formation of the coating film, and the work is terminated.

It is desirable to use all the blended crack repair agents in a short time (within 1 hour).

For several hours or 24 hours after construction, exposure to rain or excessive direct sunlight should be suppressed and protected from freezing.

Construction equipment should be immediately washed with water before drying, and the finished coating film is non-toxic, but because it is an alkaline product containing cement, protective equipment must be worn. Skin exposed for a long time should be cleaned with soapy water after work.

The crack repair agent of the present invention undergoes hydration even after the coating film is cured in the presence of sufficient moisture to form a very hard and tough water-resistant coating film, and the longer the curing period of the coating film is, the more unhydrated cement contained therein proceeds to hydration even after the coating film is cured. As the exposure period increases, the strength increases, and the elongation of the coating film deposited in water for a long period of time decreases.

In addition, the crack repair agent has the property of converting into a hard coating film depending on the progress of the hydration reaction of the cement contained in the slurry over time. The coating of the coating film on the crack area can be applied to cracks without any other measures. After this, the cement in the coating film gradually undergoes a hydration reaction and is converted into a coating film having a fine structure and excellent abrasion property.

The coating is kept in a very hard and flexible form and prevents the penetration of water, chlorides or sulfates into the parent concrete. In addition, water present in the coating film is discharged to the outside as water vapor and is covered with a flexible inorganic elastic coating film.

In addition, the present invention is applicable to various places such as parking lot floor construction, rooftop waterproof construction, and factory line coating work.

The following examples illustrate the present invention in more detail, but do not limit the scope of the present invention.

Example 1

The first topic was prepared by mixing 10 kg of carboxylated styrene butadiene random copolymer resin (trade name Synthomer 29Y40, Malaysia Synthomer) and 1 kg of carboxymethylcellulose.

5kg of silica sand (average particle size of 60 mesh) and 5kg of Portland cement are mixed, and 0.5kg of a dispersant (brand name Hycon, TASS Co., Ltd.) is homogeneously mixed to prepare the second topic.

Then, 7 kg of the first topic and 3 kg of the second topic were mixed, and then 4 kg of water was added and uniformly mixed with an electric mixer to prepare the crack repair agent of the present invention.

Experimental Example 1

The crack repair agent prepared in the above example, marketed under the brand name KG-60, is an epoxy product, is a two-component product, has a viscosity of 150 cps, and has a solid content of 78%, as a crack repair agent of Comparative Example 1, and the brand name KG Commercially available as -25, a two-component epoxy product, a viscosity of 500 cps, and a solid content of 98% was used as a crack repair agent in Comparative Example 2.

The crack repair agent prepared in Example 1 and the crack repair agent of Comparative Examples 1 and 2 were applied to the surface of a concrete specimen with a diameter of 10 cm and a cylindrical shape strength of 250 Kgf/cm 2 by about 1 mm, and then weighed when completely dried. After the measurement, the specimen was immersed in a water tank at a depth of 1 m for 30 days, and then the surface of the specimen was wiped with a dry towel, and the weight was measured. As a result of comparing the weight change rate, that is, a value obtained by dividing the weight of the specimen after being immersed in water by the weight of the initial specimen, it was confirmed that the crack repair agent of the present invention was hardly penetrated.

On the other hand, after generating a crack in the concrete specimen, as a result of injecting the crack repair agent prepared in Example 1 and the crack repair agent of Comparative Examples 1 and 2, it was confirmed that the crack repair agent of the present invention was injected more deeply.

As described above, those skilled in the art to which the present invention pertains will be able to understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof.

Therefore, the above-described embodiments are illustrative in all respects and should be understood as non-limiting.

The scope of the present invention is indicated by the appended claims rather than a detailed description, and all changes or modified forms derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention. .

100: structure
110: base surface
200: Hado
300: crack repair agent
400: moderate
500: top coat

Claims (5)

The first topic consisting of a carboxylated styrene butadiene random copolymer resin and a tackifier, and at least one second topic selected from the group consisting of cement, silica sand, fly ash and mortar are weight ratios of 8:2 to 4:6. A crack repair agent, characterized in that the mixed main material and water are mixed in a weight ratio of 3: 7 ~ 7: 3. The method of claim 1, wherein the carboxylated styrene butadiene random copolymer resin is a copolymer synthesized by copolymerization of a styrene monomer and a butadiene monomer, and a small portion of styrene or butadiene is a resin containing a carboxyl group, and the carboxyl group is in a neutral form- COOH or a free carboxyl group (-COOH) or a carboxyl salt (-COOM: M is a metal), and the monomer having a carboxyl group is in the range of 0.05% to 10% by weight based on the carboxylated styrene butadiene random copolymer. Crack repair agent, characterized in that. The method of claim 1, wherein the tackifier is at least one material selected from the group consisting of cellulose, gum, rosin, and terpene resin, and is used in an amount of 1 to 20% by weight based on the weight of the carboxylated styrene butadiene random copolymer resin. Crack repair agent, characterized in that. Sanding the entire surface of the concrete structure, brick masonry structure, or stone using a grinder, but if the crack is more than 3mm, perform V-cutting and clean it. Forming step, after applying a primer, a first subject consisting of a carboxylated styrene butadiene random copolymer resin and a tackifier, and at least one second subject selected from the group consisting of cement, silica sand, fly ash, and mortar are weight ratio 8 : A step of preparing a crack repair agent by mixing the main material and water mixed in 2 ~ 4: 6 using an electric mixer at a weight ratio of 3: 7 ~ 7: 3, injecting the prepared crack repair agent into the crack area and applying it The crack repair method comprising the step of repairing the cracked area by filling it with, forming a middle coat and a top coat using a commercially available middle coat agent and a top coat agent, and curing after curing for a certain period of time after the top coat. Sanding the entire surface of the concrete structure, brick masonry structure, or stone using a grinder, but if the crack is more than 3mm, perform V-cutting and clean it. Forming step, after applying a primer, a first subject consisting of a carboxylated styrene butadiene random copolymer resin and a tackifier, and at least one second subject selected from the group consisting of cement, silica sand, fly ash, and mortar are weight ratio 8 : A step of preparing a crack repair agent by mixing the main material and water mixed in 2 ~ 4: 6 using an electric mixer at a weight ratio of 3: 7 ~ 7: 3, injecting the prepared crack repair agent into the crack area and applying it The crack repair method comprising the step of repairing the crack area by filling it with, and applying a commercially available water-based or oil-based paint.

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