KR102193762B1 - Composite Repair Method for Concrete Structures Using Fast Drying Filling Repair Materials - Google Patents

Abstract

The present invention relates to a composite repairing method, which repairs a concrete structure by using fast drying filling repair materials in the concrete structure having cracks in which emergency repair is necessary and, more specifically, to a composite repairing method for a concrete structure using fast drying filling repair materials, which fills and applies the filling repair materials in accordance with a crack size of the concrete structure after a surface of the concrete structure having the cracks is surface-preprossed, thereby facilitating emergency repair and having excellent strength and durability of the concrete structure after repair. Also, the composite repairing method for a concrete structure using the fast drying filling repair materials further includes steps of applying waterproof paint and installing a degasifier so as to reinforce waterproofing properties as needed, thereby maintaining the concrete structure for a long time.

Description

Composite Repair Method for Concrete Structures Using Fast Drying Filling Repair Materials}

The present invention relates to a repair method capable of exhibiting excellent strength and waterproof performance within a short time by applying a fast-drying filling repair material to concrete structures such as old buildings, rooftop floors, window frames and underground parking lots that require emergency repair.

Concrete structures are one of the most widely used structure types in modern society. This concrete structure has excellent durability and has an inexpensive advantage in terms of price.

However, due to the inherent characteristics of the concrete material, cracks occur due to external impact, and as external rainwater penetrates through it, the durability of the concrete structure is weakened and aging is promoted. In this way, the crack may affect the structural safety of the concrete structure depending on the location of the crack and the width and depth of the crack, and may cause deterioration through corrosion of reinforcing bars, or deteriorate durability.

In addition to these factors, reinforcing bars may be corroded and concrete may be damaged by neutralization of concrete structures, alkali aggregate reaction, and chemical erosion, which leads to problems such as exterior damage and deterioration of waterproof performance.

Therefore, conventionally, when internal reinforcing bars are corroded and concrete cracks or breaks due to various factors, a crack repair material is injected into the crack or damaged area or putty ( It is mainly used to repair and reinforce using putty) materials.

However, the conventional method of repairing and reinforcing cracks or damaged parts of concrete structures using a putty material has poor adhesion to the repair and reinforcement parts of the putty material, as well as adhesion to the coating finish layer formed on the outermost side. There was a problem of falling, and there was a difficulty in preventing corrosion of the rebar.

In addition, such a repair method not only takes a considerable amount of time to complete the repair, but it is highly likely to cause defects by urgently performing repairs to shorten the operator's working time. If the subsequent work is performed while the urgently repaired concrete surface is not completely dried, shrinkage occurs due to the characteristics of the concrete, resulting in a flaking phenomenon, resulting in renovation.

Korean Patent Publication No. 10-1744500 Korean Patent Publication No. 10-1852333

Therefore, in order to solve the above-described problems, the present invention provides a complex repair method for concrete structures that can repair and reinforce cracks with excellent adhesion and elasticity, while quickly repairing to have excellent strength and durability using a fast-drying filling repair material. This is a technical solution.

In order to solve the above technical problem, the present invention,

A surface pretreatment step of removing foreign substances from the cracked surface of the concrete structure; And a repair step of applying a quick-drying filling repair material obtained by mixing an elastic filling material and an elastic repair material in a weight ratio of 1 to 3: 1 on the pretreated surface,

In the repair step, repair by applying the filling repair material according to the width of the crack area or whether the rebar is exposed,

When the width of the cracked part is at least 0.5mm or the reinforcing bar is exposed, the cracked part or the exposed part of the reinforcing bar is first filled with the filling repair material to harden, and then the filling repair material is applied and repaired,

When the width of the cracked area is less than 0.5mm or the reinforcing bar is not exposed, it is characterized in that repairing by applying a filling repair material to the surface of the cracked area,

The elastic repair material includes 20 to 30 parts by weight of polyacrylate, 20 to 30 parts by weight of vinyl acetate, 1 to 5 parts by weight of surfactant, 40 to 50 parts by weight of distilled water, and 0.1 to 2 parts by weight of additives,

The elastic filler includes 10 to 15 parts by weight of Portland cement, 5 to 15 parts by weight of anti-rust pigment, 20 to 25 parts by weight of extender pigment, 0.1 to 1 parts by weight of fluidizing agent, 5 to 10 parts by weight of admixture, and 1 to 5 parts by weight of thickener Characterized in that.

Preferably, it characterized in that it further comprises the step of forming a maternal reinforcement layer by applying a surface reinforcement agent to the pretreated surface before the repair step,

The surface strengthening agent is distilled water 10 to 20 parts by weight, silicate binder 40 to 50 parts by weight, extender pigment 15 to 20 parts by weight, solvent 1 to 5 parts by weight, silane coupling agent 0.5 to 5 parts by weight of water to a permeable surface strengthening agent containing It is characterized by mixing.

More preferably, when the reinforcing bar is exposed in the repair step, before applying the filling repair material,

V-cutting the surface on which the parent body reinforcement layer is formed around the exposed portion of the reinforcing bar; And it characterized in that it further comprises the step of applying a rust-preventing primer to the exposed portion of the V-cut reinforcement,

The anti-rust primer,

60 to 120 parts by weight of epoxy binder, 5 to 20 parts by weight of non-reactive diluent, 15 to 30 parts by weight of anti-rust pigment, 50 to 80 parts by weight of modified amine and 10 to 50 parts by weight of polyamide binder, 0.1 to 3 parts by weight of plasticizer It consists of a hardener part including parts, and the main part and the hardener part are mixed in a volume ratio of 3 to 5:1.

In addition, in the present invention, preferably, after applying a waterproof primer for exterior to the surface of the concrete structure where the cracked portion has been repaired through the repair step, a fiber sheet is adhered and dried on the upper surface to which the primer is applied, and then It characterized in that it further comprises the step of forming a waterproof layer by applying a waterproof coating material.

In addition, in the present invention, preferably, when the waterproof layer is formed, a degassing device capable of discharging gas to the outside is provided for each predetermined section, providing a complex repair method for a concrete structure using a quick-drying filling repair material. As a technical solution.

According to the present invention described above, by applying a fast-drying filling repair material to concrete structures such as old buildings, rooftop floors, window frames, and underground parking lots that require emergency repair, the effect of exhibiting excellent strength and waterproof performance in a short time is possible. have.

In addition, the present invention has the effect of quickly repairing to have excellent strength and durability by applying a fast-drying filling repair material while repairing and reinforcing cracks due to excellent adhesion and elasticity to cracks on the surface of a concrete structure. In addition, there is an effect of facilitating the management of the structure by preventing corrosion of reinforcing bars and neutralization of concrete and extending the life of the concrete structure through the repair.

In particular, according to the present invention, compared to the conventional concrete repair method, the drying speed of the filling repair material is faster, so it is excellent in repairing concrete structures that require emergency repair within a short period of time, and after the repair step, an exterior waterproof primer and a waterproof coating are applied. It is possible to secure long-term durability of the concrete structure by installing a degassing device.

1 is a flowchart showing a composite repair method of a concrete structure using a quick-drying filling repair material according to the present invention.
2 is a cross-sectional view showing a cross-sectional view before and after application of a surface reinforcing agent to a concrete structure in the step of forming a matrix reinforcing layer in the repair method of the present invention.
3 is a flow chart showing a process of the repair step of forming a protective layer when the width of the crack area is at least 0.5 mm or when the reinforcing bar is exposed in the repair method of the present invention and a cross-sectional view of a concrete structure.
4 is a flow chart of a process further including a step of forming a waterproof layer and a cross-sectional view of a concrete structure in the repair method of the present invention, after the repair step.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a flow chart showing a composite repair method of a concrete structure using the quick-drying filling repair material of the present invention. The present invention provides a surface pretreatment step (S100) of removing foreign substances from the cracked surface of the concrete structure and elasticity on the pretreated surface. It relates to a complex repair method for a concrete structure comprising a repair step (S200) of applying a quick-drying filling repair material obtained by mixing a filler and an elastic repair material in a weight ratio of 1 to 3:1.

It will be described in detail by dividing the steps below.

First, the surface pretreatment step (S100) is a step of removing foreign substances from the cracked surface of the concrete structure.

At this time, the foreign material removal method may be performed by various methods, and further, the surface of the cracked portion may be smoothly treated. That is, the surface can be smoothly treated using power tools or other manual tools, and the latencies, deformation, peeling, and weathering parts are removed, followed by washing with a compressor or high-pressure water, and a chipping process may be performed in the case of the gombo area. .

Next, the repair step (S200) is a step of applying a quick-drying filling repair material obtained by mixing an elastic filling material and an elastic repair material in a weight ratio of 1 to 3: 1 on the pretreated surface. The filling repair material of the present invention is quick-drying, and has a feature that enables sufficient strength and subsequent repainting only after 12 hours. Compared with the drying time of the repair material of the conventional concrete structure for at least 2 to 3 days to 7 days, the time required for hardening can be remarkably reduced, and the effect of shortening the repair construction period is great. This is because the filling repair material mixes the elastic repair material and the elastic filling material, thereby improving the strength of the filling repair material by the elastic repair material, maximizing the elasticity effect, preventing cracks due to drying shrinkage, and enabling quick drying by the elastic repair material. will be. In this way, the filler and repair material is a mixture of the elastic filler and the elastic repair material, so that repair and reinforcement are performed at the same time, while increasing adhesion, thereby protecting leakage, corrosion and erosion against physical and chemical deterioration factors of the concrete structure, thereby improving durability. At this time, it can be used for various purposes depending on the ratio of the elastic filler and the elastic repair material, and it has excellent adhesion, dryness, short repainting interval, high strength, durability and abrasion resistance, so it is preferably used for concrete structures that require emergency repair. It shows an excellent effect.

In this case, the elastic repair material may include 20 to 30 parts by weight of polyacrylate, 20 to 30 parts by weight of vinyl acetate, 1 to 5 parts by weight of surfactant, 40 to 50 parts by weight of distilled water, and 0.1 to 2 parts by weight of additives.

It is preferable to use a hydrophilic polyacrylate as the polyacrylate. The polyacrylate has excellent smoothness, durability, mechanical strength, and low shrinkage effect, and thus has an effect of reducing shrinkage of the coating film when mixed with vinyl acetate. In addition, polyacrylate is not inhibited from curing by oxygen molecules, curing rapidly proceeds to exhibit quick-drying properties, and exhibits excellent curing performance through blending with the elastic filler.

In addition, the surfactant is mixed so that polyacrylate and vinyl acetate can be mixed with distilled water, and is preferably contained in an amount of 1 to 5 parts by weight.

In addition, the distilled water may preferably be ion-exchanged water, and is preferably contained in an amount of 40 to 50 parts by weight in order to maintain physical properties as a binder for an elastic water retention agent.

In addition, the additive is preferably contained in an amount of 0.1 to 2 parts by weight, but may include at least one of a thickener, a dispersant, and an antifoaming agent, but is not limited thereto. The additive is preferably contained in an amount of less than 2 parts by weight in order not to damage physical properties as a binder for an elastic repair material.

In addition, the filling repair material, including the elastic filling material, is mixed with the elastic repair material to provide excellent elasticity and strength to the cracked portion of the structure while filling the cracked area of the concrete structure, and by preventing the phenomenon of lifting due to crack, which is a fundamental problem of the existing repair material, It is possible to reduce the number of defects as much as possible.

At this time, the elastic filler is Portland cement 10 to 15 parts by weight, rust preventive pigment 5 to 15 parts by weight, extender pigment 20 to 25 parts by weight, fluidizing agent 0.1 to 1 parts by weight, admixture 5 to 10 parts by weight and thickener 1 to 5 Including parts by weight

Specifically, the Portland cement improves adhesion to the existing concrete surface that needs repair and helps to maintain excellent adhesion even in humid places. In addition, the hardening reaction, which mainly utilizes tricalcium silicate, which is the main component of Portland cement, is fast, so it can show quick drying.

In addition, the anti-rust pigment protects from external moisture, and in the case of exposed reinforcement, it has the effect of prolonging the repair period by preventing rust. Aluminum paste, Pb3O4, zinc chromate, and basic chromic acid lead (Chtomate), zinc oxide (Zinc Oxide) and calcium phosphate (Calcium Phosphate) may be at least one selected from the group consisting of.

In addition, the extender pigment improves the specific gravity of the coating film to help the structure to be formed more stably when used as a filler and coating material, and serves to improve the strength of concrete by exerting the same effect as an aggregate in concrete during repair.

In addition, the fluidizing agent serves to disperse the cement particles to increase the fluidity of the cement, and the admixture has an effect of preventing cracking by reducing the shrinkage phenomenon of the concrete. In addition, the thickener plays a role in controlling the flowability of the concrete.

In addition, in the repair step, it is preferable to apply the filling repair material according to the width of the crack area or whether the reinforcing bar is exposed.

More specifically, when the width of the cracked area is at least 0.5mm or the reinforcing bar is exposed, the cracked area or the exposed area of the reinforcing bar is a filling repair material in which the ratio of the elastic filler and the elastic repair material is 1: 1 It is preferable to repair by first filling and curing, and then applying the filling repair material secondarily to suit the repair area.

In addition, when the width of the cracked portion is less than 0.5mm or the reinforcing bar is not exposed, it is preferable to apply a filling repair material according to the surface portion of the cracked portion.

In relation to the above-mentioned filling repair material, the mixing ratio of the elastic filling material and the elastic repair material, the thickness of the coating film, and the number of times of application are changed according to the crack portion of the concrete structure to be repaired.

More specifically, when the crack part of the concrete structure to be repaired is a wall, the filling repair material includes an elastic filler and an elastic repair material in a 3:1 weight ratio, but it is preferable to apply one time in 0.5 ~ 1.5mm or less. . This is because, when the thickness of the coating film is less than 0.5mm, a problem arises in strength and durability, and thus re-repair is required, and when the thickness of the coating film is more than 1.5mm, the surface may not be smooth due to the flow of the filling material from the wall.

In addition, when the cracked part of the concrete structure to be repaired is the floor, the filling repair material contains an elastic filling material and an elastic repair material in a weight ratio of 2:1, but it is preferable to apply two times at 4.5 ~ 5.5mm. This is because if the thickness of the coating film is less than 4.5mm, problems may occur in waterproofness, strength, and durability, and it may not be useful for subsequent work because it affects internal drying of more than 5.5mm.

In addition, prior to the repairing step, it may further include a step of forming a parent body reinforcing layer by applying a surface reinforcing agent to the pretreated surface, which is preferably selected according to the degree of neutralization of the pretreated surface.

In connection, FIG. 2 is a cross-sectional view showing a cross-sectional view before and after application of the surface strengthening agent to the concrete structure in the step of forming the parent body reinforcing layer. When the surface strengthening agent is applied with a permeable surface strengthening agent, the surface strengthening agent penetrates through the concrete surface, thereby alkalizing the neutralized concrete. By doing so, it improves the strength of the concrete structure and prevents the phenomenon from falling off.

In relation to the surface strengthening agent, a surface strengthening agent containing 10 to 20 parts by weight of distilled water, 40 to 50 parts by weight of a silicate binder, 15 to 20 parts by weight of an extender pigment, 1 to 5 parts by weight of a solvent, 0.5 to 5 parts by weight of a silane coupling agent, and It is preferable to mix and use water.

As the application method of the surface strengthening agent, it is possible to obtain reinforcement and waterproofing effect of concrete by applying to the pretreated surface by selecting one of airless, spray and brush coating methods. At this time, the application area of the surface strengthening agent may vary depending on the condition of the concrete surface, but it is preferable to apply an area of 70 to 100 m ² based on 18L of the surface strengthening agent composition, and if the subsequent work is a water-soluble type coating agent, apply it immediately. Also, in the case of an oily type coating agent, it is desirable to perform the construction after a curing process for 2-3 hours based on room temperature.

At this time, the silicate binder contained in the surface strengthening agent penetrates into the interior of the concrete surface and fills minute cracks and voids along with evaporation of moisture from the concrete, thereby providing an effect of improving the strength and hardness of the concrete. In connection, the silicate binder may be selected from sodium silicate, potassium silicate, and lithium silicate. At this time, when sodium silicate, potassium silicate, and lithium silicate are mixed in a ratio of 1:3 to 5:3 to 5, the effect of the binder can be maximized.This is because lithium silicate has the lowest whitening phenomenon among silicates, This is because the high heat resistance improves the fire resistance of sodium silicate and potassium silicate and improves adhesion. In addition, potassium silicate can improve adhesion to the concrete surface and its role as a surface reinforcing agent by creating a moisture-resistant surface while lowering the void. More preferably, it is preferable to use 40 to 50 parts by weight of the silicate binder. In this case, when the silicate binder is used in less than 40 parts by weight, adhesion to the concrete surface and the role as a surface strengthening agent are deteriorated. If it exceeds 50 parts by weight, corrosion resistance and water resistance may be deteriorated, and it is preferable to be included in the above range.

In addition, in the present invention, the extender pigment has a function of improving the strength of concrete by penetrating the silicate binder when filling the fine holes and exerting the same effect as an aggregate in concrete. Relatedly, the extender pigments include Illite-Mica, titanium dioxide, zeolite, silica sand, elvan stone, ocher stone, olivine, kaolin, silicate mineral, diatomaceous earth, wollastonite, pyrophyllite, dolomite, lithium mineral, magnesite, It may contain one or more of bauxite, bentonite, sepiolite, iron oxide, graphite, talc, clay minerals, titanium minerals, tourmaline, fly ash, and blast furnace slag.

In addition, in the present invention, the silane coupling agent is used to improve the mixability of the silicate binder and the extender pigment, and to enhance adhesion to the concrete surface. In this case, when the silane coupling agent is used in an amount of less than 0.5 parts by weight, mixing between the silicate binder and the extender pigment is difficult, and when it exceeds 5 parts by weight, economic efficiency may be deteriorated, and it is preferable to be included in the above range. . More preferably, as the silane coupling agent, an epoxy-containing silane, an amine group-containing silane, and a mercapto-containing silane may be used. Epoxy-containing silanes include 2-(3,4-epoxycyclohexyl)-ethyltrimethoxysilane, γ-glycidoxytrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-glycidoxypropyl Triethoxysilane, etc. may be included. Examples of the amine group-containing silane include N-2-(aminoethyl)-3-amitopropylmethyldimethoxysilane, N-2-(aminoethyl)-3-aminopropyltrimethoxysilane, and N-2-(amino Ethyl)-3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysili-N-(1,3-dimethylbutylidene)propyl Amines, N-phenyl-3-aminopropyltrimethoxysilane, and the like can be used. The mercapto-containing silane may include 3-mercaptopropylmethyldimethoxysilane and 3-mercaptopropyltriethoxysilane.

As described above, the surface strengthening agent is a ceramic-based penetrating surface strengthening agent, which penetrates the concrete surface by a silicate binder to reinforce the surface by filling minute cracks and voids in the concrete. In addition, an extender pigment penetrates simultaneously with the silicate binder to improve the strength of concrete, and a strong concrete layer is formed by increasing the mixing properties of the silicate binder and the extender pigment and adhesion to the concrete surface by the silane coupling agent. That is, as the deterioration and damage part of the concrete structure and the repair material are integrated, it is possible to prevent the material itself from falling off. Accordingly, if the coating agent is applied as a subsequent operation, long-term durability of the concrete structure is secured, thereby making maintenance useful.

In relation to the above, as a method of confirming the neutralization of the concrete surface, it is preferable to check the degree of neutralization of the concrete by spraying a phenophthalein reagent on the cracked area. More preferably, some concrete structures are collected using a power tool. It is desirable to check the degree of neutralization inside. At this time, in the case of the phenophthalein reagent, when the concrete structure is not neutralized, it maintains the alkalinity of pH 12.4 to 13 and shows a dark red color, and when the pH reaches the neutral level of 8 to 10, it is expressed as colorless. It is easy to check.

In addition, in the repair step, in particular, when the reinforcing bar is exposed, V-cutting the surface on which the parent body reinforcement layer is formed (S 201); And applying a rust-preventing primer to the exposed portion of the V-cut reinforcing bar (S202).

At this time, in the step of V-cutting the exposed portion of the reinforcing bar, the V-cutting is preferably performed using a manual tool and a power tool to cut both sides in a V-shape at a 45° angle around the cracked area. In addition, when rust has occurred in the exposed area of the reinforcing bar, it is desirable to completely remove the rust of the reinforcing bar, because it may affect the adhesion of the coating agent to be followed and the durability of the concrete after repair.

Next, in the step of applying the rust-preventing primer, it is preferable to apply the rust-preventing primer to the area where the reinforcing bar is exposed. Relatedly, the primer includes 60 to 120 parts by weight of an epoxy binder, 5 to 20 parts by weight of a non-reactive diluent, and 15 to 30 parts by weight of an anti-rust pigment, and 50 to 80 parts by weight of a modified amine and 10 to 50 parts by weight of a polyamide binder. , It is made of a hardener part including 0.1 to 3 parts by weight of a plasticizer, and the main part and the hardener part are mixed in 30 to 50:10 parts by weight, and it is preferable to paint using a brush, roller, or spray method.

In this case, the epoxy binder used in the main part is preferably a modified epoxy binder as a binder for the composition for an anti-rust primer, but is not limited thereto. In connection, the epoxy binder is preferably contained in an amount of 60 to 120 parts by weight, but if the content of the epoxy binder is less than 60 parts by weight, there is a problem that the adhesion between the surface of the steel structure and the anti-rust primer decreases, and the epoxy binder This is because when the content exceeds 120 parts by weight, there is a problem in that the content of other components is relatively reduced, thereby deteriorating rust prevention properties.

In addition, in the present invention, the anti-rust pigment imparts an effect of preventing rust of the reinforcing bar. In relation to the anti-rust pigment, aluminum paste (aluminium paste), gwangmyeongdan (Pb3O4), zinc chromate (Zinc chromate), basic chromate lead (Chtomate), zinc oxide (Zinc Oxide) and calcium phosphate (Calcium Phosphate) may contain one or more I can.

Next, the non-reactive diluent improves workability by lowering the viscosity of the epoxy binder and the curing agent when used. Therefore, the non-reactive diluent is included in 5 to 20 parts by weight, and may include at least one of DiButylPhthalate (DBP), DiOctylPhthalate (DOP), Nonyl-Phenol, and Hysol. In relation to this, if the amount of non-reactive diluent is less than 5 parts by weight, the viscosity of the paint is high and workability is poor, and if it exceeds 20 parts by weight, the non-reactive diluent in the paint is not chemically bonded to the cured product. There is a problem that a non-reactive diluent is deposited on the surface of the coating film due to the inclusion of an excessive amount. Therefore, when using the non-reactive diluent, it is preferable to determine the amount of the non-reactive diluent in consideration of the purpose of use, the dilution effect according to the properties of the binder component, and the characteristics and economy of the cured product.

On the other hand, in relation to the curing agent part, the modified amine plays a role in forming the coating film of the epoxy binder of the main part, and the drying time and mechanical properties of the coating film change depending on the amount used, so it is preferable to contain 50 to 80 parts by weight. When the content of the modified amine is less than 50 parts by weight, there is a problem that the main part is not cured or the curing speed is slow, so that the rust prevention properties are deteriorated, and when the content of the modified amine is more than 80 parts by weight, the state of the rust prevention primer in the container B There is a problem in that mixing, workability, storage stability, etc. become poor.

In this regard, the modified amine may be used by selecting a modified aliphatic amine or a modified aromatic amine. At this time, the modified aliphatic amine is Diethylene Triamine (DETA), triethylenetetramine (TETA), diethylamino propyl amine (DEAPA), menthanediamine (MDA), N- N-aminoethyl piperazine (N-AEP), m-xylene diamine (MXDA) and isophorone diamine (Isophorone diamine: IPDA) may contain one or more of, and the modified aromatic amine is It may include at least one of meta phenylene diamine (MPD), diaminodiphenyl methane (DDM), and diaminodipheny sulphone (DDS).

In addition, in the present invention, the polyamide binder may be a polyamide binder having an amine of 150 to 250 as a component for accelerating the curing of the main part. It is preferable that the polyamide binder contains 10 to 50 parts by weight, but when the content of the polyamide binder is less than 10 parts by weight, there is a problem in that the main part is not cured or the curing speed is slow, so that the anti-rust properties are deteriorated. When the amine content exceeds 50 parts by weight, there is a problem in that the condition of the rust-preventing primer in the container, mixing properties, workability, storage stability, and the like are poor.

On the other hand, it is important to completely apply the reinforcing bar portion to which the anti-rust primer is exposed, but apply 100 to 150 μm based on a dry coating. If the dry film is less than 100㎛, rust regenerates in the reinforcing bar inside, and the adhesion of the paint film or filler at the repair site decreases, causing concrete to fall off. If the dry film exceeds 150㎛, the drying cost of the film is delayed and subsequent work is delayed. This is because there is a problem in that the adhesion of the coating film decreases.

In relation to the anti-corrosive coating agent, but using the main part and the hardener part as a two-component type coating agent, it is preferable that the mixing ratio is 3 to 5: 1 weight ratio. This is because, when the provided curing agent part uses another curing agent or the mixing ratio is not properly observed, it affects the curing time of the coating film, so that the correct coating film is not formed or even if the coating film is formed, problems in rust prevention and adhesion occur.

On the other hand, the anti-rust pigment is a pigment that has an effect of preventing rust of the reinforcing bar, and it is not relevant to use the same kind of anti-rust pigment as the elastic filler, but is not limited thereto.

In connection, the plasticizer is preferably used in an amount of 0.1 to 3 parts by weight by giving some elasticity to the coating film. This is because the effect is insufficient when included in less than 0.1 parts by weight, and the hardness of the coating film is lowered when included in more than 3 parts by weight. In addition, it is preferable to use at least one of phthalic acid, trimellitic acid, hospite, polyester, and aliphatic, but is not limited thereto.

In addition, after the repair step, after applying a waterproof primer for exterior to the surface of the concrete structure where the cracked area is repaired, a fiber sheet is attached and dried on the upper surface to which the primer is applied, and then a waterproof coating material for exterior is applied to form a waterproof layer. It may further include the step of.

In connection with FIG. 4 is a flow chart of a process further including the step of forming the waterproof layer and a cross-sectional view of the concrete structure.

More specifically, a sufficient drying time of the filling repair material applied in the repair step is required before applying the exterior waterproof primer to the surface of the concrete structure in which the cracked portion has been repaired.

In relation to the drying time, in general, as the drying time of the conventional concrete structure repair material is dried for at least 2 to 3 days and for 7 days, it is possible to realize sufficient strength and apply a primer. On the other hand, in the case of the filling repair material of the present invention, it is sufficient if the minimum drying time is naturally dried for 12 hours or more, and sufficient strength and subsequent repainting are possible only after 12 hours have elapsed. In relation to this, if the drying time is less than 12 hours, the adhesion between the surface of the repaired concrete structure and the next applied waterproof primer for exterior is not only a problem, but also, in severe cases, a wrinkle phenomenon of the waterproof primer coating occurs. A verification process is absolutely required.

In relation to the exterior waterproof primer, an epoxy, urethane, or acrylic primer may be used. As an example, 40 to 50 parts by weight of a network acrylic emulsion binder, 1 to 5 parts by weight of surfactant, 5 to 10 parts by weight of titanium dioxide, 5 to 10 parts by weight of extender pigment, 40 to 50 parts by weight of distilled water and 0.1 to 2 parts by weight of additives It is possible to use an acrylic primer including parts, and such an acrylic primer can effectively exhibit waterproof and adhesive properties.

In relation to the network structure acrylic emulsion binder used, the drying property is improved to increase the convenience of construction, and the waterproof coating agent and adhesion are excellent due to the network structure. In addition, it is excellent in waterproofing, anticorrosive performance, and fouling resistance, so that durability can be remarkably improved. It prevents yellowing of chemical resistance and ultraviolet rays, and provides a coating film with excellent initial glossiness.

In addition, the additive used is preferably a thickener, a preservative, an antifoaming agent, an antifreeze agent, and a film forming agent, but is not limited thereto.

Next, the fiber sheet attached to the upper surface to which the primer is applied can be used for all kinds of non-woven fabrics made of chemical fibers, more preferably aramid fibers, carbon fibers and glass fibers 6-12: 1 to 1.5 : The effect can be maximized by using a nonwoven fabric included in a weight ratio of 1 to 1.5. In addition, as the fiber sheet, a nonwoven fabric having excellent tensile resistance and tensile elongation is used, but it is preferable to consider a direction orthogonal to the tensile direction in order to prevent the fiber push phenomenon by the tensile force. In addition, it is preferable to overlap the nonwoven fabric in a width of 5 to 10 cm, and this gives an effect of preventing damage, lifting, and cracking of the coating layer as it is attached.

On the other hand, as the fiber sheet is adhered at the same time as the exterior waterproof primer is applied, the cracked area can be effectively filled, thereby ensuring long-term durability of the concrete structure.

Next, a waterproof layer is formed by applying a waterproof coating material for exterior applied to the dried surface.

In relation to the exterior waterproof coating material, an epoxy, urethane or acrylic waterproof coating material may be used. In the case of epoxy paint, when it is used as a waterproof coating material exposed to the outside, the epoxy link in the resin is broken by external ultraviolet rays, so there is a risk of weather resistance and discoloration, so rather than using it as an exterior finishing material, weather resistance such as an underground parking lot is required. Urethane or acrylic is more preferable since it is inappropriate in place.

In relation to the exterior waterproofing coating material, 40 to 50 parts by weight of a network acrylic emulsion binder, 10 to 25 parts by weight of additives, 13 to 25 parts by weight of distilled water, 5 to 10 parts by weight of ceramic binder, 5 to 10 parts by weight of silane, and 30 to color pigments An acrylic-based exterior waterproof coating material containing 50 parts by weight may be used. In this case, the network structure acrylic emulsion binder more effectively exhibits weather resistance, waterproofness, and adhesion, and can be used in places where external weather resistance is required.

In addition, in the present invention, when forming the waterproof layer, a degassing device capable of discharging gas to the outside may be installed for each predetermined section. In this case, the degassing device may be a commercially available degassing device, and it is preferable to install the degassing devices at 11m intervals when installing the degassing devices. This is because the most ideal moisture discharge effect can be seen when installed at 11m intervals.

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

<Example 1> Preparation of elastic repair material and elastic filler

An elastic repair material was prepared including 25 parts by weight of polyacrylate, 25 parts by weight of vinyl acetate, 3 parts by weight of surfactant, 50 parts by weight of distilled water, and 1 part by weight of an additive.

Additionally, in a separate container, an elastic filler was prepared including 15 parts by weight of Portland cement, 10 parts by weight of rust preventive pigment, 20 parts by weight of extender pigment, 0.5 parts by weight of fluidizing agent, 5 parts by weight of admixture, and 3 parts by weight of thickener.

<Example 2> Compressive strength test specimen preparation

After washing a concrete specimen of 70 mm in width, 70 mm in length, and 50 mm in thickness with water, it was naturally dried for 6 hours, and the prepared elastic repair material and elastic filler were uniformly mixed for 30 minutes at a 1:1 weight ratio, and coated twice with a thickness of 5 mm. .

<Comparative Example 1> Preparation of comparative specimens for compressive strength testing

On the upper surface of the separate base specimen, commercially available filler products (manufacturer “Hanil Cement”, product name “Remital”) and repair material (manufacturer “PMC”, product name “Aqua Keeper”) are placed in a 1:1 weight ratio for 30 minutes. Uniformly mixed and coated twice with a thickness of 5 mm.

<Test Example 1> Compressive strength comparison experiment

The Example 2 specimen and Comparative Example 1 specimen were measured at intervals of 3 hours, 1 day, 3 days, 7 days, and 28 days through a compressive strength test, respectively, and the compressive strength test results are shown in Table 1.

The test method was carried out in accordance with KS F 4041:2009.

Unit: (N/mm ² ) Example 2 Comparative Example 1 3 hours 15.5 - 1 day 23.5 6.4 3 days 27.5 11.5 7 days 32.1 16.5 28 days 42.5 20.3

As a result of the experiment, Comparative Example 1, which is an elastic mortar sold on the market, showed a result of 6.4 N/mm ² even after 1 day of curing, and it was measured as a result of 20.3 N/mm ² even after 28 days. In the case of Example 2, the compressive strength of 15.5N/mm ² was measured in 3 hours, and after 28 days, 42.5N/mm ² , which is more than twice as high, was measured.

From the above experimental results, it was found that the strength of Example 2, which is the present invention, is faster than Comparative Example 1, which is on the market, and the strength is more than twice as high even if it is completely dried on 28 days. Able to know.

<Test Example 2> Compressive strength results according to the ratio of the elastic repair material and the elastic filler

In a state fixed with 100 parts by weight of the elastic repair material prepared in Example 1, the ratio of the elastic filler was mixed at 50, 100, 200, 300 and 400 weight ratios, respectively, and after 3 days elapsed, the state of the coating film was checked after the compressive strength test. .

Mixing ratio (parts by weight) Test result (after 3 days) Elastic filler Elastic repair material Compressive strength (N/mm ² ) Remark 50 100 13.1 Bad Cracking 100 24.2 Great normal 200 27.5 Great normal 300 25.3 Great normal 400 20.1 Bad fracture

As a result of the experiment, when the ratio of the commercially available elastic filler was mixed with 100 to 300 parts by weight, it showed a compressive strength value of 24 or more, and it was confirmed that the state of the coating film was good after the experiment, but the elastic filler was 50 parts by weight and 400 parts by weight. If included, it was confirmed that cracking occurred or the coating film was broken.

Therefore, when looking at the above results, the ratio of the elastic filler and the elastic repair material is judged to be the most appropriate ratio of 1 to 3: 1, and when the amount of the elastic filler is less or more, the physical properties rapidly deteriorate. It can be seen that it also affects the durability of.

As described above, according to the present invention, the repair work is possible within a short time by repairing the concrete structure by using the quick-drying filling repair material, and the repair effect on the wear rate, concrete strength and abrasion resistance is excellent. Therefore, it can be seen that the strength and durability of the concrete structure requiring emergency repair is secured, thereby increasing the life expectancy of the structure itself.

As the specific parts of the present invention have been described in detail above, various modifications and variations will be possible for those of ordinary skill in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments.

The scope of protection of the present invention should be interpreted by the claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

001: Steel frame 201: Filling repair material (coating)
100: concrete structure (before reinforcing the parent body) 300: waterproof layer
101: Matrix reinforced concrete structure 301: Exterior waterproof primer
102: V cut cross section 302: fiber sheet
103: anti-rust primer 303: exterior waterproof coating material
201: filling repair material (filling) 304: degassing

Claims (5)

Surface pretreatment step of removing foreign substances from the cracked surface of the concrete structure; And a repair step of applying a quick-drying filling repair material obtained by mixing an elastic filling material and an elastic repair material in a weight ratio of 1 to 3: 1 on the pretreated surface,
In the repair step, repair by applying the filling repair material according to the width of the crack area or whether the rebar is exposed,
When the width of the cracked part is at least 0.5mm or the reinforcing bar is exposed, the cracked part or the exposed part of the reinforcing bar is first filled with the filling repair material to harden, and then the filling repair material is applied and repaired,
When the width of the cracked area is less than 0.5mm or the reinforcing bar is not exposed, it is characterized in that repairing by applying a filling repair material to the surface of the cracked area,
The elastic repair material includes 20 to 30 parts by weight of polyacrylate, 20 to 30 parts by weight of vinyl acetate, 1 to 5 parts by weight of surfactant, 40 to 50 parts by weight of distilled water, and 0.1 to 2 parts by weight of additives,
The elastic filler includes 10 to 15 parts by weight of Portland cement, 5 to 15 parts by weight of anti-rust pigment, 20 to 25 parts by weight of extender pigment, 0.1 to 1 parts by weight of fluidizing agent, 5 to 10 parts by weight of admixture, and 1 to 5 parts by weight of thickener Characterized in that,
Further comprising the step of forming a parent body strengthening layer by applying a surface strengthening agent to the pretreated surface before the repairing step, wherein the surface strengthening agent is distilled water 10-20 parts by weight, silicate binder 40-50 parts by weight, extender pigment 15-20 It is characterized in that water is mixed with a permeable surface strengthening agent containing 1 to 5 parts by weight of a solvent, 0.5 to 5 parts by weight of a silane coupling agent,
After applying a waterproof primer for exterior to the surface of the concrete structure where the cracked portion has been repaired through the repair step, a fiber sheet is attached and dried on the upper surface to which the primer is applied, and then a waterproof coating material for exterior is applied to form a waterproof layer. Further comprising a step, wherein the exterior waterproofing coating material is a network structure acrylic emulsion binder 40-50 parts by weight, additives 10-25, distilled water 13-25 parts by weight, ceramic binder 5-10 parts by weight, silane 5-10 parts by weight and colored Characterized in that it contains 30 to 50 parts by weight of pigment,
Complex repair method of concrete structure using quick-drying filling repair material. delete The method of claim 1,
When the reinforcing bar is exposed in the repair step, before applying the filling repair material,
V-cutting the surface on which the parent body reinforcement layer is formed around the exposed portion of the reinforcing bar; And it characterized in that it further comprises the step of applying a rust-preventing primer to the exposed portion of the V-cut reinforcement,
The anti-rust primer,
60 to 120 parts by weight of epoxy binder, 5 to 20 parts by weight of non-reactive diluent, 15 to 30 parts by weight of anti-rust pigment, 50 to 80 parts by weight of modified amine and 10 to 50 parts by weight of polyamide binder, 0.1 to 3 parts by weight of plasticizer Consisting of a curing agent portion including a portion, characterized in that the main portion and the curing agent portion are mixed in a volume ratio of 3 to 5: 1,
Complex repair method of concrete structure using quick-drying filling repair material. delete The method of claim 1,
When forming the waterproof layer, a complex repair method of a concrete structure using a quick-drying filling repair material, characterized in that installing a degassing device capable of discharging gas to the outside for each predetermined section.

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