KR100721215B1 - Method for repairing and reinforcing damage of reinforced concrete using gel-type sacrificial anode and waterproof material having exellent insulating properties - Google Patents

Abstract

The present invention relates to a method for repairing and reinforcing a damaged part of a reinforced concrete inner surface when reinforced concrete is damaged by concrete neutralization and corrosion of reinforcing steel in reinforced concrete structures such as a water tank having a lot of water contact. The present invention relates to a method of reinforcing concrete performance by using additional gel type sacrificial anodes and a highly insulating waterproof material to prevent additional corrosion.

According to one aspect of the invention the reinforced concrete repair and reinforcement method of the present invention comprises the steps of washing the reinforcement of the damaged concrete site; Applying and drying a gel-type sacrificial anode around the washed rebar; Applying a high permeability coating on the broken concrete surface; Filling a high adhesive mortar on the concrete surface to which the coating agent is applied; And applying a waterproof coating on the filled mortar and the surrounding concrete surface.

Concrete repair and reinforcement, gel type sacrificial anode, high insulation waterproofing, reinforced concrete

Description

METHOD FOR REPAIRING AND REINFORCING DAMAGE OF REINFORCED CONCRETE USING GEL-TYPE SACRIFICIAL ANODE AND WATERPROOF MATERIAL HAVING EXELLENT INSULATING PROPERTIES}

1 is a process chart showing the progress of neutralization of concrete and the progress of reinforcing steel when water is always in contact with the reinforced concrete structure;

2 is a conceptual diagram showing the anode reaction of the corrosion of the surrounding bars according to the relative negative polarization of the reinforcing bars in the existing repair method,

3 is a schematic view showing an example of the electric corrosion method adopted for the conventional method of rebar; and

4 is a conceptual diagram showing the anticorrosive effect of the reinforcing bar according to the present invention and the anticorrosive effect by the corrosion protection circuit circuit of the insulating waterproof film.

(Explanation of the sign)

10: concrete breakage part, 20: high insulation anticorrosive material,

30: high adhesion special mortar, 40: corrosion position,

50: rebar, 60: insoluble anode (titanium mesh),

70: overlay material, 80: normal concrete,

90: neutralized concrete, 120: gel type sacrificial anode,

130: high permeability coating agent, 140: high adhesion special mortar,

150: high insulation waterproof membrane

The present invention relates to a method for repairing and reinforcing a damaged part of a reinforced concrete inner surface when reinforced concrete is damaged by concrete neutralization and corrosion of reinforcing steel in reinforced concrete structures such as a water tank having a lot of water contact. The present invention relates to a method of reinforcing concrete performance by using additional gel type sacrificial anodes and a highly insulating waterproof material to prevent additional corrosion.

Reinforced concrete refers to concrete in which reinforcing bars are inserted into the inside of the concrete. Concrete is a material that is very resistant to compressive strength, but on the contrary, it is weak when tensile or shear force is applied. Reinforcing bars are materials that are inserted to reinforce the weaknesses of concrete and provide the ability to withstand tensile or shear forces on the structure.

However, even if the reinforcing bar is very vulnerable to corrosive environment (that is, acidic environment), even if it reinforces the tensile or shearing force of the concrete, its function may be lost as the effective thickness of the reinforcing bar decreases. Concrete serves to reinforce the problem of these rebars. That is, concrete is manufactured by mixing aggregates such as fine aggregates and coarse aggregates with water, and cement, which is one of the main raw materials of the concrete, has calcium hydroxide (Ca (OH) ₂ ) as a main component. Since it is a strong alkaline raw material, it acts as a passivation to protect the corrosive environment.

Therefore, reinforcing concrete and reinforcing concrete are very effective combinations that compensate for each other's shortcomings.

However, when the reinforced concrete is exposed to a moist environment, the alkalinity of the reinforced concrete decreases and gradually neutralizes. When the concrete is neutralized it will have a fatal adverse effect on the strength of the structure, which will be described using the process diagram of FIG.

Figure 1 (a) shows a healthy reinforced concrete that has not yet been neutralized. Since the concrete 80 maintains alkalinity (pH 12 to 12.5), the environment around the reinforcing bar 50 has an environment in which the reinforcing bar becomes hard to corrode (E _reinforcing : -200 mV or more).

Figure 1 (b) shows a case where the concrete is neutralized to a certain level by continuous contact with moisture. When neutralized, the concrete's pH will decrease to less than 10 from 12 to 12.5. Neutralization of concrete refers to a phenomenon in which the pH of concrete is reduced by reacting carbon dioxide (carbonic acid) with concrete when carbon dioxide is dissolved in water and reacting with the reaction formula 1 below.

Ca (OH) ₂ + CO ₂ = CaCO ₃ + H ₂ O

By the reaction described above, the concrete is changed from alkaline to neutral. In this case, the corrosion rate of the reinforcing steel in the concrete 90 neutralized to pH 10 or less is increased by about 100 to 200 times compared to the state in which neutralization is not performed (pH 12 to 12.5). Has a devastating effect on

That is, when the concrete is neutralized, the rebar is exposed to a neutral or acidic environment having a low pH. In this case, strong corrosive elements such as carbon dioxide or chlorine reach the reinforcing bar and corrosion of the reinforcing bar 50 proceeds (FIG. 1 ( c)). When the steel is corroded, iron oxide or iron compounds are formed on the surface of the steel, which is about 3 to 5 times larger in volume and less dense than iron, the element that forms the steel, and the pressure is about 3000 psi on the concrete covering the steel. Will be added.

As a result, the concrete will be cracked, and some of the concrete 10 will break and fall off, and this phenomenon will be accelerated more when an external force is applied.

Afterwards, the concrete is separated from the water can be in direct contact with, this time, the potential of the rebar is reduced to -450 ~ -650mV level. In this case, the reinforcing bars and the potential difference of about 200-450mV are generated to form a battery, and the corrosion of the reinforcing bars, which are relative anode parts, and the complete breakage of concrete are rapidly progressed in the battery.

In the course of the above process, the complementary action of the concrete and the reinforcing bar as described above is no longer expected and the structure is placed in a condition that is difficult to support the load.

Therefore, in this case, it is necessary to repair the reinforced concrete, simply by cleaning the corroded parts of the reinforcing bar, anticorrosive treatment of the reinforcing bar with a highly insulating material, and placing new concrete on the concrete damaged part to neutralize the concrete. Since rebar corrosion cannot be prevented from recurring, a reinforcing method for strengthening the corrosion resistance of a damaged part has been researched and developed in the past.

For example, as shown in FIG. 2, the concrete damaged portion 10 is removed, the reinforcing bar 50 is washed, and the corroded reinforcing bar 50 is subjected to the high-insulating anticorrosive material 20, and The method of repairing with the adhesive special mortar 30 is mentioned. When the corroded reinforcing bar 50 is treated with the highly insulating anticorrosive material 20, the corroded portion may have enhanced corrosion resistance and thus may have an improved life in a corrosive environment. However, when using this method, a potential difference of about 200 mV to 300 mV occurs between the repair part reinforcement A and the non repair part reinforcement B, which causes the non repair part B to act as a positive electrode of the corrosion battery. have. That is, the repair part may act as a negative electrode in the corrosion battery through the high-insulating anticorrosive treatment to prevent corrosion, but the surrounding non-maintenance part causes battery corrosion to the relative positive electrode. Therefore, the existing repair method is changed only in the position where the corrosion eventually occurs only the concrete damage due to the corrosion is still bound to occur.

In order to solve the above problem, the electric method has emerged. In the electric method, as shown in FIG. The positive electrode is connected to the insoluble adult material (for example, titanium mesh) 60 so that 50 is a negative polarization so that the anodic reaction does not occur at the reinforcing bar.

This technique is very effective in the reinforcing performance of reinforcing bars and prevents the reinforcing bars in other parts from acting as anodes, but the installation process is complicated and costly because power supply devices and circuits must be formed in concrete. There is a problem that it takes too much.

The present invention is to solve the above-described problems, according to one aspect of the present invention is provided a method of repairing and reinforcing reinforced concrete that is relatively simple and can be carried out inexpensively.

According to one aspect of the invention the reinforced concrete repair and reinforcement method of the present invention comprises the steps of washing the reinforcement of the damaged concrete site; Applying and drying a gel-type sacrificial anode around the washed rebar; Applying a high permeability coating on the broken concrete surface; Filling a high adhesive mortar on the concrete surface to which the coating agent is applied; And

Applying a waterproof coating to the filled mortar and surrounding concrete surface; Characterized in that it comprises a.

In this case, the gel type sacrificial anode is preferably a gel type material obtained by gelling a metal or alloy powder having a higher ionization tendency than iron and a binder in a solvent (dispersion medium).

In this case, the metal or alloy powder of the gel-type sacrificial anode is effective that the redox potential is -1.00V SCE or less.

The metal or alloy is preferably pure zinc or zinc alloy alloyed with Al, In, Si, Mg and the like.

In addition, the average diameter of the powder of the metal or alloy is preferably 100 ~ 400㎛.

In addition, the binder may be an inorganic binder including a mixture of silicate and zinc oxide or an organic binder including a mixture of a modified epoxy and an amine curing agent.

In the gel-type sacrificial anode, the binder and the metal or alloy powder are preferably contained in a ratio of 1: 1 to 1: 1.5.

In addition, the highly permeable coating agent may include a water-soluble modified acrylic emulsion and a water-soluble silica sol.

At this time, the high permeability coating agent is preferably applied 200 ~ 300g per 1m ^{2 of} concrete to be applied.

In addition, the waterproof coating agent preferably includes an ultra high molecular special alloy resin and a ceramic powder.

At this time, the waterproof coating agent is preferably applied 200 ~ 300g per 1m ^{2 of} concrete to be applied.

The inventors of the present invention have been searching for a method for solving the problems of the prior arts and solving the technical problems to be solved by the present invention. Without this, it was concluded that it would be necessary to polarize the reinforcing bar at the broken site to the cathode.

Hereinafter, a method for repairing and reinforcing concrete damaged parts of the present invention will be described in detail with reference to FIG. 4.

The first step of the reinforced concrete anticorrosion method of the present invention is to use a sacrificial anode on the surface of the cleaned rebar. Conventionally, when using an external DC power source, an insoluble anode made of a material such as titanium is used. The insoluble anode has the advantage of not being consumed due to corrosion, but itself is not ionized by a corrosion reaction and thus does not supply power. It could not act as an anode unless it had a feature. However, sacrificial anodes are more highly ionized than rebar and are easily oxidized and ionized than Fe, which forms their own reinforcing bars in corrosion cell circuits, so they can act as a positive electrode without an external power supply. Corrosion at the rebar is prevented.

The inventors have also found that it is more desirable for the method of reinforcing the reinforcing bar to be present in the entire area of the reinforcing bars beyond simply being electrically connected partially to the rebar. That is, when the material forming the sacrificial anode is simply electrically connected to the rebar, macroscopically, the negative polarization sacrificial anode is positively polarized to prevent corrosion of the rebar, but local heterogeneity of the reinforcing material may exist. In order to completely block this, it is desirable to apply the surface of the reinforcing bar as closely as possible to cover the surface of the rebar.

In order to achieve this, the material constituting the anode portion does not have a standardized form, but needs to be formed in a gel type so as to have excellent coating and adhesion to the reinforcing portion. Therefore, the sacrificial anode of the present invention used for the reinforcing bar method needs to be a gel type sacrificial anode. In addition, in order to function as a sacrificial anode, a material having higher oxidation resistance than iron needs to be used as the material for the cathode. Suitable materials for this purpose include powders of metals or alloys which have a high tendency to ionize. In order to facilitate application and adhesion, the gel-type sacrificial anode material needs to contain a binder in a predetermined range.

The gel type sacrificial anode material which satisfies all of the above conditions is preferably a gel type material obtained by gelling a powder or a binder of a metal or alloy having a higher ionization tendency than iron in a solvent (dispersion medium). The gel-type material is applied to the surface of the rebar and then dried to act as a coating. The drying time is dependent on the ambient conditions and depends on whether or not it is completely dried.

In this case, the powder of the metal or alloy included in the sacrificial anode material should have a higher ionization tendency than iron, and especially in view of the redox potential of iron, the redox potential is -1.00 in order to easily act as a sacrificial anode. It is preferable to use the thing below V SCE.

Zinc type is mentioned as a metal or alloy which satisfy | fills the said conditions. That is, pure zinc or an alloy thereof satisfies the above conditions well. However, when pure zinc is used, it initially exhibits a potential satisfying the above range of about -1.0 V, but changes to a high potential of about -0.7 to -0.8 V within 24 hours, so the lifespan as a sacrificial anode is very short. It is preferable to use a zinc alloy. As an element included in the alloy of zinc, any element may be used as the alloying element as long as it satisfies the redox potential condition. However, the element containing Al, In, Si, Mg, or the like may be used. Since the content of each element in the alloy can be determined by whether or not to meet the redox potential, those skilled in the art can easily measure the redox potential by changing the content of the alloying element so there is no need to specifically limit these contents in the present specification. . However, for example, a zinc alloy containing Al: 0.3 to 0.6% by weight, In, Si, Mg in total of 0.1 to 0.2% by weight may be used.

Since the above-described metal or alloy powder should exist as a dispersoid in the gel, it is preferable to have a particle diameter of 200 μm or less. When the diameter is more than the above range, it is not preferable because dispersion is not easy in the gel. In addition, since the finer the particles, the easier it is to disperse, the lower limit of the particle diameter does not need to be particularly limited, but in view of the efficiency of the manufacturing process, the particle diameter is more preferably 100 μm.

In addition, both the inorganic or organic binder may be used as the binder to be included in the gel together with the metal or alloy powder to improve adhesion.

As the inorganic binder, a mixture of silicate and zinc oxide can be used. In this case, the ratio of silicate and zinc oxide is preferably 8: 1 to 10: 1. As the zinc oxide acts as a curing agent in the binder, the zinc oxide should be controlled in the above range so that it can most preferably serve as a curing agent.

In addition, a mixture of a modified epoxy and an amine curing agent may be used as the organic binder. It is preferable that the ratio of a modified epoxy and an amine hardening | curing agent at this time is 4: 1-6: 1. The amine-based curing agent acts as a curing agent in the binder to adjust the content of the amine-based curing agent in the above range can be most preferably performed as a curing agent.

In addition, the organic or inorganic binder and the metal or alloy powder are preferably included in the gel in a ratio of 1: 1 to 1: 1.5. When the content of the binder is insufficient, it is difficult to attach to the rebar with sufficient adhesive strength. On the contrary, when the content of the metal or alloy powder is insufficient, it is difficult to expect a sacrificial anode.

The gel-type sacrificial anode that satisfies the above conditions is preferably applied to the reinforcing bar and then fixed through sufficient drying.

Regarding the sacrificial anode coating process described above, the reinforcing bars included in the damaged reinforced concrete do not cause polarization of other reinforcing bars, and are negatively polarized without excessive cost, thereby improving resistance to corrosion.

In addition, it is necessary to clean the surface of the rebar before applying the sacrificial anode, the method of cleaning the reinforcing bar is not particularly limited. Commonly used methods include a polishing method for removing the oxide layer formed on the surface of the rebar, or a (sand) blasting method.

Thereafter, a step of attaching the mortar to the damaged part in which the reinforcing bar is processed by the sacrificial anode is necessary. However, when the mortar is directly attached to the damaged part, since the adhesive force between the mortar and the damaged part concrete is not strong enough, the attached mortar may be easily separated from the concrete. Therefore, in order to increase the adhesion between mortar and concrete, it is necessary to form a high adhesive film on the damaged concrete surface. The film not only has excellent adhesion to mortar, but also can easily penetrate into the concrete to form a film that penetrates deep into the concrete, thereby improving adhesion between mortar and concrete.

The method of forming the high adhesive film is as follows.

First, it is necessary to apply a coating agent in which a water-soluble modified acrylic emulsion and a water-soluble silica sol (for example, represented by the chemical formula of M ₂ O _n · SiO ₂ · H ₂ O) are mixed in an appropriate ratio. The water-soluble modified acrylic emulsion used at this time is not limited if the type used in the market, for example, can be used L1 product as a coating material of Rivall Mighty. The dispersoid particles present in the acrylic emulsion as described above may be very fine to exhibit high permeability and adhesion. The water-soluble modified acrylic emulsion has a strong adhesion on the galvanized surface, stainless steel surface, glass surface, and has excellent performance because of its strong permeability to concrete and high adhesiveness. In addition, the bonding strength with the secondary coating agent to be applied thereon is also excellent. It is preferable to contain 5-10 weight% of water-soluble silica sol in the said modified acrylic emulsion. The water-soluble silica sol is to support the anticorrosive function of the reinforcing bar is preferably included 5% by weight or more, but when the amount exceeds 10% by weight of the modified acrylic emulsion content is reduced because the performance of the coating agent is not preferable not. Typically, this type of coating material may be used XCP-100-based undercoat. The above-described coating agent is excellent in the penetration force into the concrete can form a coating layer in a wide range on the thick concrete. The amount of the coating agent is not particularly limited because it depends on the thickness of the concrete, the conditions of use, the use environment, etc., but in general, the amount of 200 ~ 300g per 1 m ² of concrete unit or 40 ~ 80㎛ coating based on the thickness of the coating film It is desirable to. The coating agent may be applied using a conventional tool such as a sprayer brush or the like.

Thereafter, reinforced concrete can be obtained by filling a high-adhesive special mortar on the concrete and reinforcing bar coated with the coating agent in a shape corresponding to the removed concrete shape. For example, the special mortar may be used by mixing an acrylic emulsion-based synthetic resin with water together with cement and sand. At this time, the cement and sand per 1 part by weight of the acrylic emulsion-based synthetic resin is preferably used in a mixture of 7.77 to 10 parts by weight and 15.5 to 20 parts by weight, respectively. When the amount of the cement is excessive, the mortar manufacturing cost increases, which is not preferable, and when included in an appropriate amount or less, the strength of the mortar decreases. Sand must be added over a certain amount because it serves as aggregate, but excessive addition decreases the strength of the mortar. In addition, the water to be mixed may be appropriately added in consideration of viscosity, uniform mixing and curing degree of mortar, and the amount thereof is not particularly limited. However, when the special mortar is filled in the above-described composition ratio, the amount is acryl included in the special mortar. It is more preferable to add in the ratio of 2.66-4 weight part per 1 weight part of emulsion type synthetic resin. Moreover, although the acrylic emulsion type synthetic resin normally used may be used also as an example of the said acrylic emulsion type synthetic resin, As a more preferable example, it is preferable to use L1F on Rivall Mighty.

Even if the method described above and the damaged part supplementary treatment are consumed too quickly, the sacrificial anode may be depleted and exposed to the risk of corrosion if the sacrificial anode is consumed too quickly to reach a sufficient economic effect. In order to prevent the rapid consumption of the anode and to prevent the corrosion environment of the reinforcing part, the neutralization of the repair part is prevented to maintain the alkalinity of the repair part for as long as possible, and corrosive elements such as water, salt, and carbon dioxide reach the reinforcing or sacrificial anode part. You need to be as restrained as possible.

To this end, it is necessary to form a highly insulating waterproof coating on the concrete surface (which means including mortar). The high insulation waterproof coating agent means a coating agent that improves the insulation of concrete and forms a film having a high waterproof function when applied to the concrete surface.

The high insulation waterproof coating agent may be used by mixing the ultra high molecular weight special alloy resin and ceramic powder in an appropriate ratio (preferably 5 to 10% by weight of the ceramic powder in the ultra high molecular weight special alloy resin). An example of ultra-high molecular special alloy resins is the L4 topcoat from Rivall Mighty (Japan). The amount of the waterproofing coating agent is not particularly limited because it depends on the thickness of the concrete, the conditions of use, the environment of use, etc., but is generally applied in an amount of 200 to 300 g per 1 m ² of concrete unit or 100 to 500 μm on the basis of thickness. It is desirable to. According to the results of the present inventors, when the waterproofing coating agent is applied to about 2mm, it may have insulation even at a high voltage of about 42,000V, thereby preventing corrosion by inhibiting formation of a corrosion cell between internal reinforcing bars.

Therefore, a more preferred method of repairing and reinforcing concrete damaged parts of the present invention comprises the steps of washing the reinforcement 50 of the damaged concrete part as shown in FIG. Applying and drying the gel-type sacrificial anode 120 around the cleaned rebar; Applying a high-permeability applicator 130 on the broken concrete surface; Filling the high adhesion mortar 140 on the concrete surface to which the coating agent is applied; And applying a waterproof coating 150 on the filled mortar and the surrounding concrete surface.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, it is necessary to note that the following examples are intended to illustrate the present invention in more detail and are not intended to limit the scope of the present invention. This is because the scope of the present invention is determined by the matters described in the claims and the matters reasonably inferred therefrom.

(Example)

Example 1

As the concrete neutralization progressed, some repairs and reinforcement work were performed on the concrete tank where some parts were damaged and the rebar part was exposed.

Alloy zinc powder of Zn: Al: In alloyed at a weight ratio of 99.3: 0.6: 0.1 and a diameter of 100-200 µm was prepared as a sacrificial anode powder. The alloy zinc powder was prepared by preparing a mother alloy in which Zn: Al was alloyed at 95: 5 and alloying the zinc alloy by adding the mother alloy and an In ratio to satisfy a predetermined ratio. The inorganic binder and the zinc alloy powder prepared in a weight ratio of 9: 1 silicate and a zinc oxide curing agent as a binder and the zinc alloy powder was mixed in a ratio of 1: 1.5 to disperse in water to prepare a gel.

The gel was applied to the surface of the rebar washed by sandblasting using a brush and a spatula to a thickness of 1 to 3 mm and then dried for 24 hours.

On the reinforcing bars to which the gel was applied, the high adhesive special mortar was filled in a form corresponding to the broken concrete form and cured.

After curing, apply 300g per m ² of XCP (Special Corrosion Protection) -based primer (5-10% of water-soluble modified acrylic emulsion L1 and water-soluble silica sol) using a brush and spray After coating so that the thickness is 20 ~ 40㎛ excluded except drying for 24 hours at room temperature to form a coating film.

Subsequently, a waterproof coating agent mixed with an L4 ultra high molecular weight special alloy resin and a water-soluble silica sol in a ratio of 10% to the weight of the alloy resin was applied in an amount of 300 g per 1 m ² of the repair part to form a final coating layer.

The damaged concrete repaired in this manner was confirmed that the attachment surface is solid, and even when used for a long time there is no change in the shape of the peripheral portion as well as the damaged portion.

Example 2

Only the binder included in the sacrificial anode was repaired and reinforced in the same manner as in Example 1 except for using an organic binder in which a modified epoxy and an amine curing agent were mixed at a ratio of 5: 1. The effect was observed in the same manner as.

As a result of the observation, it was found that the concrete damaged part repaired in the above manner was firm in its attachment surface, and that even when used for a long time, the shape of the damaged part as well as the damaged part did not change at all.

 As described above, unlike the conventional method, the present invention does not undergo a complicated repair process such as connecting a DC power source such as an electric method without causing corrosion of neighboring bars other than the repaired and reinforced bars, and has a long service life. It is possible to provide a significantly improved method of repairing and reinforcing reinforced concrete.

Reinforced concrete repaired and reinforced by the present invention is excellent in the corrosion resistance of the repair portion and excellent waterproof and insulating properties of the concrete can significantly prevent additional reinforcement corrosion.

Claims (11)

Washing the reinforcing bars of the damaged concrete site; Applying and drying a gel-type sacrificial anode around the washed rebar; Applying a high permeability coating on the broken concrete surface; Filling a high adhesive mortar on the concrete surface to which the coating agent is applied; And Applying a waterproof coating to the filled mortar and surrounding concrete surface; Reinforced concrete breakage repair and reinforcement method comprising a. The method of claim 1, wherein the gel-type sacrificial anode is a gel-type material, characterized in that the gel-type material is a gel (gel) by mixing a powder or a binder of a metal or alloy having a higher ionization tendency than iron in a solvent (dispersion medium) How to repair and reinforce. The method of claim 2, wherein the powder of the metal or alloy included in the gel-type sacrificial anode has a redox potential of -1.00 V SCE or less. The method of claim 3, wherein the metal or alloy is pure zinc or an alloy of zinc including Al, In, Si, Mg, and the like. The method of claim 2, wherein the average diameter of the powder of the metal or alloy is 100 ~ 400㎛. The method of claim 2, wherein the binder is an inorganic binder including a mixture of silicate and zinc oxide or an organic binder including a mixture of a modified epoxy and an amine curing agent. The method of claim 2, wherein the binder and the metal or alloy powder in the gel-type sacrificial anode are contained in a ratio of 1: 1 to 1: 1.5. The method of claim 1, wherein the highly impermeable coating agent comprises a water-soluble modified acrylic emulsion and a water-soluble silica sol. The method of claim 8, wherein the high permeability coating agent is applied to the repair and reinforcement of the reinforced concrete breakage, characterized in that 200 ~ 300g per 1m ^{2 of the} concrete to be applied. The repair and reinforcement method of claim 1, wherein the waterproof coating agent comprises an ultra high molecular weight special alloy resin and a ceramic powder. The repair and reinforcement method of claim 10, wherein the coating agent is applied at 200 to 300 g per 1 m ^{2 of} concrete to be applied.

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