KR101698187B1 - Method for Repairing Cracks in Concrete Buildings - Google Patents

Abstract

The present invention relates to a method for repairing a crack in a concrete building, capable of maintaining a beautiful exterior and excellent adhesiveness when water paint is painted by repairing mold generated due to moisture penetration due to a crack, rust, or corrosion of reinforcing bars exposed due to deterioration using a rust preventative and antibacterial primer, coating a crack repair agent with excellent tensile strength and excellent percent elongation on the crack generated due to the exposed reinforcing bar and the deterioration so that the crack is repaired, and coating an upper layer adhesion improvement primer. According to the present invention, the method for repairing a crack in a concrete building includes: a surface treating step of treating the surface of a damaged part on a wall of the concrete building; a rust preventative and antibacterial treating step of coating a rust preventative and antibacterial solution on the corroded reinforcing bar exposed to the surface of the wall after the surface treating step; a step of arranging a coating surface on which the rust preventative and antibacterial solution is coated, using a mesh tape; a concrete crack repairing step of coating a crack repairing solution on the crack of the concrete building; and an upper layer adhesion improvement primer coating step of coating the upper layer adhesion improvement primer on the part on which the crack repairing solution is coated. The rust preventative and antibacterial solution used for the rust preventative and antibacterial treating step is composed of: 40-50 wt% of an emersion; 1-3 wt% of propylene glycol; 0.5-1 wt% of a wetting agent; 10-20 wt% of titanium dioxide; 5-10 wt% of zinc phosphate; and a remainder composed of moisture.

Description

Technical Field [0001] The present invention relates to a method of repairing cracks in a concrete building,

More particularly, the present invention relates to a method for repairing cracks in a concrete building, and more particularly, to a method for repairing cracks in concrete caused by corrosion, rust, or cracking of exposed reinforcing bars due to aging, , Antimicrobial and aging, and repair of cracks caused by exposed reinforcing bars by applying a crack repair agent with excellent tensile strength and elongation, and then applying a primer to improve the adhesion of the top coat. The present invention relates to a method for repairing cracks in a concrete building that can be maintained over a long period of time.

Generally, a concrete building consists of reinforced concrete with excellent tensile strength and filled with concrete with excellent durability and compressive strength.

In other words, the reinforced concrete structure is a structure system that combines strong concrete with strong compressive force and strong reinforcing steel with tensile strength, and the inherent characteristics of each material are rationally supplemented. The alkaline concrete forms a passive film on the reinforcing bar, Is an excellent structure that can take more than 100 years.

As concrete buildings are reasonably efficient building materials that combine the characteristics of each material, recently, the air pollution due to global warming has deepened, and as a result, the concrete buildings have become more vulnerable to acid rain and atmospheric temperature changes, , The vibration of building due to the redevelopment project caused the concrete building to rapidly deteriorate or be affected by the deterioration phenomenon, thereby reducing the durability of the building.

The deterioration of the concrete building promotes the deterioration as well as the detachment of the coating film, which can cause cracks in the concrete building. If cracks occur, cracks spread like a domino phenomenon.

In addition, the deterioration phenomenon causes the concrete to be neutralized (carbonated) and corrodes the reinforcing bars. Typically, the neutralization of concrete structures progresses gradually, but there is no big problem, but rainwater or other contaminants are introduced into cracks due to cracks, thereby accelerating the neutralization and accelerating the rebar corrosion. Furthermore, if water penetration occurs at cracks, bacterial growth such as fungi and erosion will occur.

In order to repair or reinforce the cracks occurring in the concrete building, it is necessary not only to apply the crack area by the crack repair material but also to the adhesion of the water paint which is finally applied after the rust prevention and anti- It is necessary to propose a crack repair and construction method considering the property.

On the other hand, since the outer walls of concrete structures such as apartment houses or apartments are painted with water-based paint, conventionally, cracks in outer walls have been repaired using a crack repair agent containing a solvent having a strong dissolving power such as epoxy or urethane .

However, if such a crack repair agent is used on a water-based paint, it causes peeling from the water-based paint on the base.

If epoxy or urethane-based repair agents are used at exposed parts of the reinforced concrete due to the deeper neutralization of concrete, it will corrode the exposed reinforcing bars due to the low pH (acidity) of the repair agent itself and a lot of carbon dioxide (CO ₂ ) At the time of rehabilitation, the neutralization area around the rebar is enlarged. Accordingly, a new coating crack repair agent and a corresponding repair method for waterproofing and coating the outer wall of a concrete structure capable of solving the problems of the existing crack repair method are required.

In consideration of this point, Korean Patent Registration No. 10-1031067 (Patent Document 1) selects a crack repair agent and an appropriate repair method of suitable quality for waterproofing and painting the exterior wall of the apartment, and then, at this point, Reinforced concrete structure Reinforced concrete structure to prevent the corrosion of reinforcing steel and neutralization of concrete by suppressing the inflow of rainwater and the contact of carbon dioxide gas (CO ₂ ) on the concrete surface to the maximum, A method of repairing cracks on the outer wall of an apartment and repairing the coating for coating has been proposed.

However, in the conventional method for repairing cracks in the prior art disclosed in Patent Document 1, when the exposed reinforcing bars after the pretreatment of the cracked portion are present, the first composition composed of 70 to 80 wt% of xylene and 20 to 30 wt% of the polyolefin resin, It is used as anti-rust and undercoat material.

However, xylene in the first composition is a harmful substance to be managed which threatens the kidney function, liver function, and central nervous system, and is a combustible poisonous substance. Since it is aquatic and ecotoxic, it can not be an eco-friendly crack repair method.

On the other hand, Korean Patent Registration No. 10-0970004 (Patent Document 2) discloses a lightweight polymer cement mortar composition for recovering an end face of a concrete structure using a lightweight ash, and Korean Patent Registration No. 10-0982469 (Patent Document 3 ), An organic polymer modifier that complements the properties of an inorganic binder having the characteristics of ultra-fast speed and roughness, adhesion, abrasion resistance, and anti-neutralization, an alkoxysilane-based rust inhibitor that functions as a rust inhibitor of rebar, and a metal oxide- There has been proposed a mortar composition for emergency construction which has a composite fast speed, an early strength, an anticorrosion and an antimicrobial performance, and a construction method of a concrete structure by the same.

 The above-described Patent Documents 2 and 3 fail to propose a whole crack repair method for a concrete building.

: Korean Registered Patent No. 10-1031067 : Korean Registered Patent No. 10-0970004 : Korean Patent Registration No. 10-0982469

The present invention has been proposed in order to solve the above-mentioned problems, and an object of the present invention is to provide an antimicrobial repair agent for antifungal agents, which is caused by corrosion of the exposed reinforcing bars due to aging, rust, , Antimicrobial and aging, and crack repair caused by exposed reinforcing bar after repairing by applying a crack repair agent having excellent tensile strength and elongation, and then applying the undercoating agent to improve the adhesion. And a method for repairing cracks in a concrete building that can be maintained in the long term.

Another object of the present invention is to provide an eco-friendly method which is harmless to a constructor and a user by using a composition composed of an eco-friendly material, all of which are used for repairing cracks in a concrete building, a rust inhibitor / antimicrobial primer, And to provide crack repair methods for concrete buildings.

To achieve the above object, according to the present invention, there is provided a crack repair method for a concrete building, comprising: a substrate processing step of surface-treating a damaged portion of a wall surface of a concrete building; An anticorrosion treatment step of corrosion-resistant reinforcing bar and antimicrobial treatment in which anticorrosion treatment agent is applied to the corrosion-resistant reinforcing bar exposed to the wall surface after the embossing step; A concrete crack repairing step of applying a crack repairing agent to cracks and cracks of the concrete building; And a top coat adhesion enhancing application step of applying a primer for top coat adhesion enhancement to a part to which a crack repairing agent is applied, wherein the anticorrosion treatment agent used in the anticorrosion treatment step is 40 to 50% by weight of an emulsion, Propylene glycol: 1 to 3 wt%, wetting agent: 0.5 to 1 wt%, titanium dioxide: 10 to 20 wt%, zinc phosphate: 5 to 10 wt%, antibacterial agent: 0.1 to 0.3 wt% Characterized in that the composition is used.

The acrylic emulsion contains an amount of 40 to 50% by weight for adhesion to the substrate and stability of the coating. If it is less than 40% by weight, adhesion and rust resistance are poor, and if it exceeds 50% by weight, the stability of the paint is deteriorated.

Titanium dioxide contains a content of 10 to 20% by weight for optimizing the covering of the surface. When the content is less than 10% by weight, the covering of the surface of the paper is lowered, and when it is more than 20% by weight, the stability of the coating is deteriorated.

Zinc phosphate contains an amount of 5 to 10% by weight for optimizing rust resistance. If it is less than 5% by weight, the rustproofing property is deteriorated. If it exceeds 10% by weight, the stability and adhesion of the paint are inferior.

The crack repairing agent used in the concrete crack repairing step may include 40 to 45% by weight of acrylic emulsion, 20 to 30% by weight of calcium carbonate, 10 to 15% by weight of polyurethane (PUD) 5% by weight, ethylene glycol: 0.5 to 1% by weight, and the balance of water.

The acrylic emulsion contains an amount of 40 to 45% by weight for adhesion to the substrate, resistance to cracking, and stability of the coating. When it is less than 40% by weight, adhesion and crack resistance are poor. When it exceeds 45% by weight, the stability of the coating is poor.

Calcium carbonate contains a content of 20 to 30% by weight in order to increase the durability of the crack repair agent and to adjust the gloss. If it is less than 20% by weight, the durability of the crack repairing agent may deteriorate and a dichroic phenomenon may appear. If it exceeds 30% by weight, the viscosity of the paint increases and the stability becomes poor.

The polyurethane contains a content of 10 to 15% by weight for optimizing tensile strength and elongation. If it is less than 10% by weight, the tensile strength and the elongation are inferior to each other and the crack resistance is poor. When the amount exceeds 15% by weight, the stability of the paint is deteriorated. Titanium dioxide contains 1 to 5% by weight for optimizing the cover surface hiding. When the content is less than 1% by weight, the cover surface of the base paper is lowered. When the content exceeds 5% by weight, the stability of the coating material is deteriorated.

In the above crack repair agent, it is preferable that the calcium carbonate is maintained at a pH of 6 to 9 to function as a pH buffering agent.

The polyurethane is preferably PUD (Polyurethane Dispersions), and is preferably maintained at a solid content of 23 to 32% by weight for physical properties and viscosity stability of the self-repairing agent itself.

The undercoating composition for top coat adhesion enhancement used in the topcoat adhesion enhancement step may be a composition comprising 20 to 30% by weight of an acrylic emulsion, 0.1 to 0.5% by weight of an antifoaming agent, 2 to 3% by weight of an acrylic thickener, have.

The acrylic emulsion has a content of 20 to 30% by weight for adhesion between the substrate and the top water-based paint and stability of the coating. If the amount is less than 20% by weight, adhesion between the substrate and the aqueous paint may deteriorate, resulting in detachment of the coating film. If the amount of the coating agent is more than 30% by weight, the stability of the undercoating agent for improving adhesion is deteriorated. The acrylic thickener contains 2 to 3% by weight for enhancing the workability of the undercoating agent for improving the adhesion of the top coat. When the amount is less than 2% by weight, the workability of the coating is poor. When the amount is more than 3% by weight, the stability of the coating improves due to viscosity increase of the undercoating composition.

In this case, the acrylic emulsion is maintained at a pH of 8 to 9, and it is preferable that the acrylic emulsion has a solid content of 48.5 to 50.5% by weight in order to improve the adhesion with the upper surface after the concrete crack repairing step.

In addition, the antifoaming agent may be composed of a polysiloxane mixture of polysiloxane, and it is possible to remove bubbles and ensure viscosity of the agent even when the adhesion is improved.

In the case of aged concrete in the above-mentioned pavement treatment step, when there is a poorly formed concrete film such as a whitening phenomenon caused by climate change or ultraviolet ray, bulging, and peeled paint film, a sanding grinder, high pressure water washing, .

It is preferable that the concrete crack repairing step using the crack repairing agent is performed after completion of curing and drying of the anticorrosive coating agent applied to prevent cracking and peeling of the paint.

If there is no fungus, corrosion, or rusty reinforcement on the concrete surface, it is also possible to perform the concrete crack repairing step by omitting the corrosion inhibiting and antimicrobial treatment steps after completion of the pavement treatment step.

According to the present invention, the crack repairing method of a concrete building further includes a step of arranging a coated surface on which a rust-preventive and antibacterial treatment agent is applied with a mesh tape, thereby improving a durability by forming a matrix on a coated surface.

It is preferable that the crack repairing agent used in the concrete crack repairing step is maintained in a high viscosity state for adhesion to the surface and workability of the coating operator.

In addition, the concrete crack repairing agent may be treated in one cycle, and a site having a large crack region may be divided into two processes under the supervision of a supervisor.

As described above, in the present invention, the mold caused by the corrosion of the exposed reinforcing bars due to aging, rust, or cracks is repaired by anticorrosion, anticorrosion, antimicrobial and aging, It is possible to maintain a good adhesion and a beautiful appearance for a long period of time in the subsequent water-based paint application by applying a repair agent having excellent tensile strength and elongation at the crack site and repairing the top coat adhesion improving agent.

In addition, according to the present invention, since a rust-inhibiting / antimicrobial undercoating agent, a crack repairing agent and a top coat adhesion promoting agent used for repairing cracks on the inner and outer walls of a concrete building are all composed of an environmentally friendly material, The method can be implemented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process flow diagram illustrating a method for repairing cracks in a concrete building according to the present invention.

The above and other objects, features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which: .

Referring to FIG. 1, a crack repairing method of a concrete building according to the present invention includes a base treatment step (S11) for surface-treating a damaged portion of a concrete surface, a rust preventing process for corrosion- A concrete crack repairing step (S14) in which a crack repairing agent is applied to cracks and cracks in the concrete, and a step in which the repairing agent is applied to the portion where the crack repairing agent is applied, And a top coat adhesion enhancement application step (S15).

Hereinafter, the crack repairing method of the concrete building according to the present invention will be described in detail for each process.

First, in the case of the aged concrete, in the case of the aged concrete processing step S11, when there is a poorly formed film such as a chalking phenomenon or a swollen and peeled coating film caused by a climate change or ultraviolet rays, a sanding grinder, To remove contaminants from the surface.

In addition, if the concrete surface is fungal due to neutralization of concrete, appearance of chloride, cracks and water supply, or corrosion or rusted steel, surface treatment is performed by sanding grinder or high pressure water washing to remove foreign matter.

After the pelletizing step S11 is completed, a corrosion inhibiting and antimicrobial treatment step S12 is performed.

The anti-corrosion and antimicrobial treatment step (S12) of the corrosion-resistant reinforcing bar is different in treatment depending on the degree of damage to the inner wall or outer wall of the concrete building.

If there is mold growth due to corrosion, rust, or moisture penetration of the reinforcing steel due to aging (neutralization), rust inhibition and antimicrobial treatment step (S12) are applied to prevent corrosion and apply antibacterial primer.

The anticorrosive and antimicrobial primer used in the anticorrosion and antimicrobial treatment step (S12) of the corrosion-resistant reinforcing bar is composed of 40 to 50% by weight of acrylic emulsion, 1 to 3% by weight of propylene glycol, 0.5 to 1% by weight of wetting agent, To 5% by weight of zinc phosphate, 0.1% to 0.3% by weight of antimicrobial agent, and the balance of water (water).

Acrylic emulsion in the anticorrosive and antimicrobial primer forms a coating film as a resin paint, and its content is determined so as to make the film strength dense, improve the adhesion ability of the surface, and adjust the drying time.

Titanium dioxide and zinc phosphate are added to impart anti-corrosiveness.

Propylene gloycol is used as a cryoprotectant, and wetting agent helps to disperse pigments and is added in small quantities for storage stability.

As the antimicrobial agent, silver oxide monodisperse powder pigment containing silver oxide (AgO) or an anion in the metal oxide system having antimicrobial action can be used. When the content of the antimicrobial agent is less than 0.1% by weight, antimicrobial activity is hardly expected to be exhibited. When the content of the antimicrobial agent is more than 0.3% by weight, the antimicrobial activity does not increase continuously. The amount of antimicrobial agent is determined to be 0.1 to 0.3% by weight since it is not beneficial to health.

On the other hand, if the concrete surface is free from mold, corrosion or rusted steel due to neutralization of concrete, appearance of chloride and cracks and water supply under supervision of the supervisor on the spot, after the completion of the pavement treatment step (S11) The antibacterial treatment step S12 is omitted and the concrete crack repairing step S13 is performed quickly.

When the anticorrosion and anticorrosive treatment of the corrosion-resistant reinforcing bar is completed (S12), the step of arranging the coated surface with the mesh tape (S13) is performed. That is, if a mesh tape made of a synthetic resin is applied on a coated surface after applying anticorrosive and antibacterial primers, the mesh tape acts as a matrix and durability is increased.

After completing the coating surface preparation, a concrete crack repairing step (S14) is performed in which a crack repairing agent is applied to cracks and cracks in the concrete.

The concrete crack repair and maintenance stage (S14) is excellent in adherence to the concrete surface and has waterproof performance. It is excellent in elongation and tensile strength even at -10 ~ 40 ℃ in order to be suitable for climate of four seasons. The composition of the crack repair agent is determined so that the weather resistance is strong.

The crack repairing agent used in the concrete crack repairing step (S14) may include 40 to 45% by weight of acrylic emulsion, 20 to 30% by weight of calcium carbonate, 10 to 15% by weight of polyurethane, 1 to 5% by weight of titanium dioxide, 0.5 to 1% by weight of glycol, and the balance of water.

The acrylic emulsion is determined so that the coating film is formed as a resin paint similarly to the anticorrosive and antimicrobial primer, while the coating strength is made dense and the adhesion ability of the surface is improved.

Calcium carbonate is calcium carbonate and is maintained at pH 6-9 to function as a pH buffer. Since the cement constituting the concrete building is alkaline, it is preferable to maintain the pH value of the calcium carbonate from neutral to weakly alkaline.

In addition, calcium carbonate (Calcium Carbonate) is an opacifying agent that helps to conceal the coating film hardens and serves as a reinforcing agent to provide weatherability.

The polyurethane constituting the above crack repairing composition is water-dispersed polyurethane (PUD), which is maintained at a solid content of 23 to 32% by weight for physical properties and viscosity stability of the self-repairing agent itself, and cracks And a certain amount or more is added to ensure tensile strength and elongation.

Titanium dioxide (TiO2) helps to improve the resistance to ultraviolet rays such as weather resistance and serves as a framework of the coating film. Ethylene gloycol is used as a cryoprotectant.

It is preferable that the above-mentioned crack repairing agent is maintained in a high viscous state for the adhesion to the surface and the workability of the coating worker, and the treatment is performed in one cycle, desirable.

In addition, the concrete crack repair agent is required to proceed after completion of curing and drying of the anticorrosive coating composition applied to prevent cracking and peeling of the top coat.

When concrete crack repair is completed, a top coat adhesion enhancement application step (S15) is performed in which a top coat adhesion improving agent is applied to a portion of a concrete surface and a portion where a crack repair agent is applied.

The top coat adhesion promoting agent used in the top coat adhesion enhancement application step (S15) is a composition comprising 20 to 30% by weight of an acrylic emulsion, 0.1 to 0.5% by weight of an antifoaming agent, 2 to 3% by weight of an acrylic thickener, do.

The acrylic emulsion constituting the primer adhesion promoting primer may be maintained at a pH of 8 to 9 and may have a solid content of 48.5 to 50.5% by weight in order to improve adhesion with the upper surface after the concrete crack repairing step. Also, since the cement constituting the concrete building is alkaline, maintaining the pH value of the acrylic emulsion to be weakly alkaline is desirable to have adhesion durability while avoiding the derivation of salt.

Also, the antifoaming agent constituting the undercoating agent for enhancing top coat adhesion is composed of a polyglycol mixture of polysiloxane, and is added to remove bubbles and ensure viscosity of the antioxidant.

The acrylic thickener acts as a viscosity modifier to control the paint thinning to facilitate workability.

According to the present invention, it is possible to repair the fungus caused by water penetration due to corrosion, rust, or cracking of the exposed reinforcing bar due to aging, and to repair the antimicrobial agent using antimicrobial agents, After repairing the crack area by applying a crack repair agent having excellent tensile strength and elongation, the top coat adhesion improving agent is applied.

Generally, aqueous paint is applied on the outermost side of the building for the purpose of waterproofing the exterior of the building and insulating the exterior of the building, and periodic repainting is performed considering the corrosion or peeling of the coating on the outer wall surface .

According to the present invention, since the coating of the undercoat layer is promoted after the repairing step of the top coat, excellent adherence and a beautiful appearance can be maintained for a long time in the subsequent coating of the aqueous paint.

In addition, according to the present invention, since a rust-inhibiting / antimicrobial undercoating agent, a crack repairing agent and a top coat adhesion promoting agent used for repairing cracks on the inner and outer walls of a concrete building are all composed of an environmentally friendly material, The method can be implemented.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. Will be clear to those who have knowledge of.

The present invention relates to a method for repairing molds caused by corrosion caused by corrosion, rust, or cracking of exposed reinforcing bars due to aging, It is possible to maintain excellent adhesion and beautiful appearance for a long period of time in subsequent water-based paint coating by applying the coating agent for improving the adhesion of the top coat after repairing and applying a crack-repairing agent having excellent elongation, have.

Claims (11)

A base treating step of treating a damaged portion of the wall surface of the concrete building;
An anticorrosion treatment step of corrosion-resistant reinforcing bar and antimicrobial treatment in which anticorrosion treatment agent is applied to the corrosion-resistant reinforcing bar exposed to the wall surface after the embossing step;
A concrete crack repairing step of applying a crack repairing agent to cracks and cracks of the concrete building; And
And a top coat adhesion enhancement application step of applying a primer for top coat adhesion enhancement to the portion to which the crack repair agent is applied,
The anticorrosive treatment agent used in the corrosion inhibiting and antimicrobial treatment step may include 40 to 50% by weight of acrylic emulsion, 1 to 3% by weight of propylene glycol, 0.5 to 1% by weight of wetting agent, 10 to 20% by weight of titanium dioxide, , Zinc phosphate (Zinc phosphate): 5 to 10 wt%, antibacterial agent: 0.1 to 0.3 wt%, and the balance of water is used for repairing cracks in a concrete building. The method according to claim 1,
The crack repairing agent used in the concrete crack repairing step may include 40 to 45 wt% of acrylic emulsion, 20 to 30 wt% of calcium carbonate, 10 to 15 wt% of polyurethane, 1 to 5 wt% of titanium dioxide, , Ethylene glycol: 0.5 to 1% by weight, and the balance of water. 3. The method of claim 2,
Wherein the calcium carbonate is maintained at a pH of 6 to 9 so as to function as a pH buffer. 3. The method of claim 2,
Wherein the polyurethane is water-dispersed polyurethane (PUD) and is maintained at a solid content of 23 to 32 wt% for the purpose of physical stability and viscosity stability of the crack repairing agent itself. The method according to claim 1,
The undercoating composition for top coat adhesion enhancement used in the topcoat adhesion enhancement step is a composition comprising 20 to 30% by weight of an acrylic emulsion, 0.1 to 0.5% by weight of an antifoaming agent, 2 to 3% by weight of an acrylic thickener, Wherein the cracks are formed in the cracks. 6. The method of claim 5,
Wherein the acrylic emulsion is maintained at a pH of 8 to 9 and has a solid content of 48.5 to 50.5 wt% for enhancing adhesion with a top coat after a concrete crack repairing step. 6. The method of claim 5,
Wherein the antifoaming agent is a polysiloxane mixture of polysiloxane. The method according to claim 1,
In the case of aged concrete in the above-mentioned pavement treatment step, when there is a poorly formed concrete film such as a whitening phenomenon caused by climate change or ultraviolet ray, bulging, and peeled paint film, a sanding grinder, high pressure water washing, Wherein the cracks are formed in the cracks. delete The method of claim 1, wherein
Wherein the concrete crack repairing step using the crack repairing agent is performed after completion of the curing and drying of the anticorrosion coating agent applied to prevent cracking and peeling of the top coat paint. The method according to claim 1,
The method of claim 1, further comprising, after the corrosion inhibiting and antimicrobial treatment step, cleaning the coated surface coated with the antimicrobial treatment agent by rusting with a mesh tape.

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