KR102784426B1 - Repainting layer for wall of concrete structure - Google Patents

Abstract

A repainting layer for a wall of a concrete structure, which maintains adhesion to the wall of the concrete structure and prevents the occurrence of gaps in a repaired crack, is proposed. The repainting layer includes a primer layer applied on the concrete structure and the crack, a putty layer which fills the crack and includes a porous body, and a coat layer and an exterior paint layer which are sequentially applied on the primer layer and the putty layer, wherein the putty layer includes at least one of a synthetic resin such as a urethane type, an epoxy type, and an acrylic type, or micro cement, and the porous body includes a plurality of pores and includes 1 to 5 wt% based on the total weight of the putty layer.

Description

{Repainting layer for wall of concrete structure}

The present invention relates to a repainting layer, and more specifically, to a repainting layer that ensures sufficient reinforcement and waterproofing for repainting a wall of a concrete structure.

Painting work is usually done by applying paint in stages such as base, middle, and top coats to form a paint layer. When a certain period of time passes, cracks appear in the paint layer, the top coat peels off, and moisture seeps into the interior. When moisture seeps in, it causes corrosion of the concrete structure, so several repaints are applied, but when the durability period is reached, the existing paint layer is peeled off and a full-scale repainting is performed. Meanwhile, concrete structures are subject to structural cracks caused by poor construction, physical damage, corrosion of rebar, and performance degradation due to impact, as well as nonstructural cracks caused by plastic shrinkage and settlement, drying shrinkage, and freeze-thaw. These cracks cause problems such as structural defects in concrete structures, decreased durability, damage to appearance, and decreased waterproofing performance, so it is necessary to respond quickly and appropriately to the occurrence of cracks.

The conventional repainting method involves high-pressure washing, etc. to treat the material, and repairing cracks as in Domestic Patent No. 2,072,939 and Domestic Patent No. 2,259,894. After that, a binder is applied to strengthen the bond, and painting is performed with water-based paint, etc. However, with the conventional method, deterioration occurs between the repaired cracks and the binder over time, and microscopic gaps occur. Moisture and air enter the gaps, which causes deterioration of the concrete, corrosion of the reinforcing steel, and a decrease in the bonding strength of the repainting layer.

The problem to be solved by the present invention is to provide a repainting layer for a wall of a concrete structure that maintains adhesion to the wall of the concrete structure and prevents the occurrence of gaps in repaired cracks.

A repainting layer for a wall of a concrete structure for solving the problem of the present invention includes a primer layer applied on the concrete structure and a crack, a putty layer that fills the crack and includes a porous body, and a coat layer and an exterior paint layer sequentially applied on the primer layer and the putty layer. At this time, the putty layer is formed by including at least one of a synthetic resin such as a urethane-based, an epoxy-based, and an acrylic-based resin or micro cement, and the porous body includes a plurality of pores and comprises 1 to 5 wt% of the total weight of the putty layer.

In the repainting layer of the present invention, the porous earthenware body includes porous silicon carbide powder, and the silicon carbide powder can be contained in an amount of 5 to 50 wt% based on the total weight of the porous earthenware body. The putty layer can further include 1 to 5 wt% of a porous potassium titanate body including a plurality of pores. The putty layer can include a buffer layer located between the primer layer and the concrete structure and including a surface reinforcing agent.

In the repainting layer of the present invention, the putty layer may include a bonding layer that improves adhesion with the putty layer. The bonding layer may include a porous ceramic body. The bonding layer may further include a potassium titanate porous body including a plurality of pores. The bonding layer may include a plate-shaped ceramic forming at least one layer while forming a void (G). The plate-shaped ceramics may be arranged parallel to each other, inclined, or in a combined form. The bonding layer is divided into a lower layer, a perforated layer, and an upper layer, and the perforated layer is a space provided by a buffer grid.

According to the repainting layer for the wall of the concrete structure of the present invention, by performing crack repair after applying the primer layer, the adhesion to the wall of the concrete structure is maintained and gaps are not formed in the repaired cracks.

Figure 1 is a cross-sectional view illustrating the first repainting layer according to the present invention.
Figure 2 is a photograph showing a potassium titanate porous body applied to the first repainting layer.
Figure 3 is a cross-sectional view illustrating a second bonding layer according to the present invention.
Figure 4 is a cross-sectional view illustrating the third bonding layer according to the present invention.
Figure 5 is a cross-sectional view illustrating a second repainting layer according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below may be modified in various different forms, and the scope of the present invention is not limited to the embodiments described below. The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. In the drawings, exaggerated representations are provided for convenience of explanation. Meanwhile, in the drawings, the thicknesses of films (layers, patterns) and regions may be exaggerated for clarity. In addition, when it is mentioned that a film (layer, pattern) is on, above, below, or on one side of another film (layer, pattern), it may be formed directly on the other film (layer, pattern), or another film (layer, pattern) may be interposed between them.

An embodiment of the present invention proposes a repainting layer for a wall of a concrete structure, which maintains adhesion to the wall of the concrete structure and prevents the occurrence of gaps in the repaired cracks by performing crack repair after applying a primer layer. To this end, a repainting layer including a functional binder and crack repair will be described in detail, and improvement of physical properties by a method of implementing the repainting layer will be described in detail. The repainting layer of the present invention is applied to a wall of a concrete structure, and concrete structures exist in various forms, such as underground, rooftop, exterior wall, and tunnel.

Fig. 1 is a cross-sectional view for explaining a first repainting layer (100) according to an embodiment of the present invention. However, it is not a drawing in the strict sense, and there may be components not shown in the drawing for the convenience of explanation.

According to FIG. 1, the first repainting layer (100) includes a putty layer (30) and a first bonding layer (40) in a crack (10) formed in a concrete structure (CT). A primer layer (20) is applied on the concrete structure (CT) and the crack (10). A coat layer (50) and an exterior paint layer (60) are sequentially positioned on the primer layer (20) and the putty layer (30). In the past, the primer layer (20) was applied after the putty layer (30) was formed, but if this were done, deterioration occurs between the putty layer (30) and the concrete structure (CT) over time, and a microscopic gap is generated. Moisture and air enter the gap, causing deterioration of the concrete structure (CT) and corrosion of the reinforcing bar, and a decrease in the bonding strength of the first repainting layer (100). In contrast, the first repainting layer (100) can suppress the occurrence of the gap by forming a putty layer (30) after applying the primer layer (20).

Cracks (10) occur in the floors, ceilings, and exterior walls of concrete structures (CT) in basements, rooftops, tunnels, etc. of buildings. Cracks (10) occurring in concrete structures (CT) include structural cracks resulting from performance degradation due to poor construction, physical damage, corrosion of reinforcing steel, and impact, and nonstructural cracks resulting from plastic shrinkage and settlement, drying shrinkage, freeze-thaw, etc. In practice, cracks (10) have a predetermined shape through high-pressure washing, grinding, cutting, etc. for repair, and the drawing presents one example.

The primer layer (20) is preferably formed after the existing paint layer is peeled off. In some cases, the existing paint layer may not be peeled off, but it is generally recommended to peel off the existing paint layer. The peeling of the existing paint layer can be applied by a known method, such as peeling by grinding. Thereafter, the surface of the wall from which the existing paint layer has been removed is subjected to a surface treatment using high-pressure washing, etc. After the surface treatment is completed, a primer layer (20) is applied to the concrete structure (CT) and the crack (10). The primer layer (20) may include a binder for reinforcing adhesion, a waterproofing agent, an anti-rust agent, and a surface reinforcing agent.

The binder of the primer layer (20) may use a composition already known. For example, it may be a resin in which vinyl acetate (EVA), acrylic emulsion, vinyl acetate, polyurethane, urea, polyvinyl acetate, acrylic emulsion containing pigment, etc. are appropriately mixed with respect to 100 wt% of water. At this time, the binder may change the content of each composition to change the viscosity, and layers with different viscosities may be laminated to increase the adhesive strength. In addition, in addition to the composition, at least one selected from butylacrylate emulsion, phthalic acid ester emulsion, epoxy emulsion, phenol emulsion, and polyoxyethylene octiphenyl ether emulsion may be added.

The above waterproofing is not necessarily limited thereto, but can utilize a material that does not permeate water, such as a material having a functional group that has no polarity and thus no affinity for water molecules, such as a hydroxyl group, an amino group, a carboxyl group, etc., which are hydrophobic substances for waterproofing. The above rust prevention can be any substance that is already well known to prevent corrosion of steel bars, and examples thereof include known chromates, phosphates, silicates, and alkylallyl sulfonates. Organic nitrogen, sulfur compounds, aliphatic higher amines, petroleum sulfonates, and metallic soaps can be used as needed.

The above surface reinforcing agent is preferably a mixture of an inorganic reinforcing agent including an alkaline silicate, a water-soluble resin, and an organic binder, and the organic binder particularly improves the adhesive strength with the putty layer (30). It penetrates into the micropores of the concrete structure (CT) and creates calcium hydroxide and insoluble calcium silicate hydrate generated by the cement hydration reaction, thereby filling the micropores and enhancing the strength.

The above alkali silicate is formed by mixing at least one of potassium silicate and lithium silicate with sodium silicate, and the molar ratio of SiO ₂ /R ₂ O (wherein R is K, Li, Na) is 1.5 to 4.0, and the content of SiO ₂ is preferably 10 to 30 wt%. In addition, the content of the alkali silicate is preferably 5 to 50 wt% with respect to the total weight. If the content of the alkali silicate is less than 5 wt%, the concentration of the alkali silicate is too low, and the surface reinforcing effect of the concrete structure (CT) such as prevention of salt damage, neutralization, etc. is reduced. If it exceeds 50 wt%, the viscosity becomes too high, making it difficult to penetrate into the concrete structure (CT), the surface strength of the concrete structure (CT) is reduced, and the bonding strength with other compositions is deteriorated. In addition to the alkali silicate, the surface reinforcing agent may further include an inorganic substance to improve the surface reinforcing effect.

The above-mentioned water-soluble resin provides water resistance and has excellent penetrability into the surface of a concrete structure (CT), so it can fill the pores in the concrete structure (CT) and improve the watertightness, and is useful for surface reinforcement of a concrete structure (CT). On the other hand, if the surface is reinforced with the above-mentioned alkali silicate, cracks may occur in the primer layer (20) due to stress caused by shrinkage or expansion of the concrete structure (CT), and cracks may also occur due to external impact. The water-soluble resin can prevent cracks in the primer layer (20) due to the above-mentioned stress and alleviate external impact. The water-soluble resin includes water-soluble acrylic resin, urethane resin, epoxy resin, vinyl resin, etc. The content of the water-soluble resin is preferably 10 to 30 wt% with respect to the total weight of the primer layer (20). If the content is less than 10 wt%, the surface reinforcement effect of the concrete structure (CT), such as prevention of salt damage and neutralization, is reduced, and if it exceeds 30 wt%, the surface reinforcement effect by the alkali silicate is reduced.

The above organic binder enhances the bonding strength between the compositions and enables curing over time, thereby increasing the watertightness inside the concrete structure (CT) and improving mechanical properties such as water resistance, chemical resistance, wear resistance, durability, and strength. The above organic binder includes one selected from the group consisting of epoxy resin, acrylic resin, polydimethylsiloxane resin, phenol resin, polyurethane resin, amino resin, and polyester resin. The content of the organic binder is preferably 1 to 5 wt% with respect to the total weight of the primer layer (20).

The primer layer (20) of the present invention may contain additives such as pigments, pigment dispersants, surface modifiers, flame retardants, antibacterial agents, antifungal agents, leveling agents, wetting agents, antifreeze agents such as ethylene glycol and diethylene glycol, as needed. Since the additives are known, their detailed description will be omitted. The content of the additives may be appropriately adjusted in consideration of the total weight of the primer layer (20).

The binder (31) of the putty layer (30) includes synthetic resins such as urethane, epoxy, and acrylic, or micro cement. When the urethane type starts hydrolyzing, the shape of the injected putty layer (30) is deformed. Since the epoxy type does not adhere to water, it is practically mixed with the urethane type and used. The acrylic type uses a lot of foaming repair agents, and the acrylic gel type is applied to reduce defects due to leakage. The micro cement is mixed with cement and water-based emulsion resin to complement each other, and has the disadvantage of a slow curing speed. In addition, the binder (31) of the putty layer (30) can be applied in a multi-component type such as a two-component type. An emulsifier, an antifoaming agent, a dispersant, a preservative, a thickener, a pigment, water, etc. can be mixed in the putty layer (2) as needed. The binder (31) of the putty layer (30) is preferably a known high-elasticity putty layer containing at least one synthetic resin such as urethane, epoxy, and acrylic. The high-elasticity putty layer may contain fillers such as calcium carbonate, a silane coupling agent, calcium hydroxide, magnesium hydroxide, barium hydroxide, and silica.

The putty layer (30) includes a porous earthenware body (32) and may optionally further include a porous potassium titanate body (33). The porous earthenware body (32) increases the bonding strength with the putty layer (30) and improves the breathability and insulation of the putty layer (30). The porous earthenware body (32) is mainly manufactured by calcining clay. Clay refers to fine soil particles having a diameter of 0.004 mm or less, and when rocks are weathered and decomposed, clay minerals are mainly formed by combining with silicon, aluminum, and water. Since clay has a much larger surface area per unit weight than sand or silt, it is the most active part in soil along with corrosion and has strong moisture and nutrient retention capacity. The porous earthenware body (32) is harmless to the human body, non-toxic, and can be used for a long time. In addition, the porous earthenware body (32) maintains excellent environmental resistance in a natural state and is inexpensive to produce. Furthermore, the fine pores created during the process of manufacturing the pottery body (32) have the function of a natural filter that allows air to pass through and blocks water.

In order to control the apparent density in the pottery porous body (32), silicon carbide (SiC) powder is mixed. The silicon carbide powder exists in a form included in the pottery porous body (32), and generates gas by causing a chemical reaction with atmospheric gas and heat during the process of manufacturing the pottery porous body (32). For example, the silicon carbide powder reacts with oxygen by heat to generate an oxygen compound, thereby being converted into a porous body. Here, the oxygen compound may be _CO2 , and the _CO2 plays a role in controlling the apparent density (AD) of the pottery. The apparent density is expressed in units of g/cc, and refers to the mass per unit volume. The apparent density varies depending on the number of pores included in the pottery porous body (32) and the size of the pores, and the larger the relative volume occupied by the pores, the smaller the apparent density.

The content of the porous earthenware (32) is preferably 1 to 5 wt% based on the total weight of the putty layer (30), taking into consideration the dispersibility, breathability, and insulation of the porous earthenware (32). If the content of the porous earthenware (32) is less than 1 wt%, the breathability and insulation effects are reduced, and if it exceeds 5 wt%, the putty material component is reduced, reducing the crack repair effect. In addition, the content of the silicon carbide powder in the porous earthenware (32) is 5 to 50 wt% based on the weight of the porous earthenware (32). If the content of the porous silicon carbide powder in the porous earthenware (32) increases, the apparent density of the porous earthenware (32) decreases. As the content of the silicon carbide powder increases, the number of pores relatively increases, and the size of the pores also increases. In this way, silicon carbide powder can control the air permeability of the ceramic porous body (32) by controlling the number and size of pores.

Optionally, the putty layer (30) may further include a potassium titanate porous body (33). The potassium titanate porous body (33) increases the bonding strength of the putty layer (30) and improves the air permeability and thermal insulation of the putty layer (30). The potassium titanate porous body (33) is formed by sintering fibers (a), powders (b), etc. as shown in FIG. 2, and each has pores (Vg). The porosity of the potassium titanate porous body (33) can be controlled by a known method. The potassium titanate porous body (33) not only has excellent mechanical performance, but also has unique physicochemical properties, especially due to its own tunnel structure. For example, it has high infrared reflectivity, low thermal conductivity, thermal insulation, high heat resistance, high wear resistance, high electrical insulation and low dielectric constant, chemical stability, etc.

The content of the potassium titanate porous body (33) is preferably 1 to 5 wt% based on the total weight of the putty layer (30), taking into consideration the dispersibility, air permeability, and thermal insulation of the potassium titanate porous body (33). If the content of the potassium titanate porous body (33) is less than 1 wt%, the air permeability and thermal insulation effects are reduced, and if it exceeds 5 wt%, the putty material component is reduced, reducing the crack repair effect.

The porous earthenware (32) and the porous potassium titanate (33) retain moisture and then slowly evaporate it, thereby preventing deterioration due to moisture. In addition, the pores of the porous earthenware (32) and the porous potassium titanate (33) provide thermal insulation. The pores connected in a three-dimensional network form absorb moisture and air, thereby lowering the thermal conductivity of the putty layer (30). The thermal insulation of the porous bodies (32, 33) suppresses rapid temperature changes in the putty layer (30), thereby suppressing shrinkage and expansion of the putty layer (30). In other words, the porous bodies (32, 33) contribute to effectively preventing cracks in the putty layer (30) by slowly evaporating moisture and suppressing rapid temperature changes.

Meanwhile, if the size of the crack (10) is large, the putty layer (30) does not solidify properly in some areas, especially in the center. In this case, since the putty layer (30) does not solidify uniformly over the entire area, the putty layer (30) deteriorates over time and fine gaps occur. When the gaps occur, moisture and air are absorbed into the gaps, which reduces the function of the repair agent and prevents the putty layer (30) from performing its role properly. Specifically, when moisture penetrates the putty layer (30) after construction, the moisture is heated by sunlight and becomes water vapor, and instead of evaporating, it remains in the gaps, increasing the vapor pressure. When the vapor pressure increases, a swelling phenomenon occurs in which the vapor pressure pushes up from the gaps.

The porous bodies (32, 33) are evenly distributed within the putty layer (30), so that the solidification of the putty layer (30) occurs uniformly throughout the entire crack (10). This is because the uniform distribution of the porous bodies (32, 33) prevents the liquid putty layer (30) from coagulating. The porous bodies (32, 33) can solve the problem of the putty layer (30) not being solidified properly. In addition, the porous bodies (32, 33) act as anchors, so that the putty layer (30) continues to maintain a dense state. When the putty layer (30) is evenly solidified throughout the entire crack (10), deterioration of the putty layer (30) that may occur over time is prevented, thereby suppressing the occurrence of microscopic gaps. When the gaps are suppressed, moisture and air are prevented from being absorbed into the gaps, allowing the putty layer (30) to sufficiently perform its role. In this way, if the putty layer (30) is solidified uniformly throughout and the density is continuously maintained, moisture absorption from the outside is prevented, and the vapor pressure generated by moisture being heated by sunlight is fundamentally blocked, thereby eliminating the swelling phenomenon.

The first bonding layer (40) is located inside the putty layer (30), and improves the adhesive strength of the putty layer (30) and prevents moisture or foreign substances from penetrating into the putty layer (30), thereby providing waterproof properties. The first bonding layer (40) improves the bonding strength of the putty layer (30), thereby improving the strength of the putty layer (30). In this way, the presence of the first bonding layer (40) has a significant effect on the lifespan of the putty layer (30). The first bonding layer (40) includes a bonding layer binder (41) in the form of an emulsion in which a binder (31) is dispersed with an emulsifier, a stabilizer, etc. in a solution, and the embodiment of the present invention includes a pottery porous body (32), and may optionally further include a potassium titanate porous body (33). The bonding layer binder (41) may be applied without limitation as long as it is known. The porous bodies (32, 33) are as described above.

The porous bodies (32, 33) are evenly distributed throughout the first bonding layer (40), so that solidification of the first bonding layer (40) occurs uniformly throughout the first bonding layer (40). This is because the uniform distribution of the porous bodies (32, 33) prevents the liquid first bonding layer (40) from coagulating. The porous bodies (32, 33) can solve the problem of the first bonding layer (40) not being solidified properly. In addition, since the porous bodies (32, 33) act as anchors, they allow the first bonding layer (40) to maintain a dense state. When solidification of the first bonding layer (40) occurs uniformly throughout, deterioration of the first bonding layer (40) that may occur over time is prevented, thereby suppressing the occurrence of microscopic gaps. When the gaps are suppressed, moisture and air are prevented from being absorbed through the gaps, allowing the first bonding layer (40) to sufficiently perform its role. In this way, if the solidification of the first bonding layer (40) is uniformly achieved throughout and the density is continuously maintained, moisture absorption from the outside is prevented, and the vapor pressure generated by moisture being heated by sunlight is fundamentally blocked, thereby eliminating the swelling phenomenon.

The first bonding layer (40) can more effectively prevent cracks in the first bonding layer (40) by allowing moisture to bypass the path of moisture, so that the moisture is absorbed and evaporated more slowly into the porous body (32, 33). Inside the first bonding layer (40), at least two layers of plate-shaped ceramics (42), for example, plate-shaped ceramics (42) made of coarse potassium titanate, talc, etc., are laminated, and the drawing shows an example of three layers of plate-shaped ceramics (42). The layer made of plate-shaped ceramics (42) is not formed as one, but is formed as layers while the plate-shaped ceramics (42) form pores (G). The porous bodies (32, 33) are dispersed between the plate-shaped ceramics (42).

For example, the plate-shaped ceramic (42) is preferably formed of coarse potassium titanate, and the length (L) is preferably 1 to 10 ㎛ on average. If it is less than 1 ㎛, the length is too short to form a gap (G) and form a layer. If it is greater than 10 ㎛, the length is too long to allow the porous bodies (32, 33) to enter the space between the plate-shaped ceramics (42) and be difficult to fill properly. If the porous bodies (32, 33) are not filled properly, the degree of moisture control is reduced due to a decrease in the density of the first bonding layer (40). In the drawing, the plate-shaped ceramics (42) are expressed as being laminated in parallel, but in reality, each plate-shaped ceramic (42) may be laminated while being inclined in whole or in part. When the porous bodies (32, 33) are filled in the space between the plate-shaped ceramics (42), the inflow path of moisture flowing in from the outside of the first bonding layer (40) is blocked or prevented as much as possible.

Figure 3 is a cross-sectional view for explaining a second bonding layer (70) according to an embodiment of the present invention. At this time, the second bonding layer (70) is the same as the first bonding layer (40) except for the buffer grid (71) and the layer structure. For convenience of explanation, the buffer grid (71) is expressed in a flat plane.

According to FIG. 3, the second bonding layer (70) includes a buffer grid (71) in the form of a matrix. The buffer grid (71) prevents the porous body (32, 33) from being damaged when a load is applied to the concrete structure (CT). The buffer grid (71) can be made of various materials, but a mesh made of synthetic resin is preferable. The buffer grid (71) withstands the load, and if the buffer grid (71) is a mesh, it exhibits the characteristics of the porous body (32, 33) described above, although there is a difference in degree. The porous body (32, 33) is filled in the space (71a) provided by the buffer grid (71). Accordingly, the second bonding layer (70) is divided into a lower layer (70a), a perforation (70b), and an upper layer (70c). The perforation (70b) absorbs and slowly releases moisture, thereby preventing the second bonding layer (70) from swelling and maintaining adhesion to the perch layer (30).

Fig. 4 is a cross-sectional view for explaining a third bonding layer (80) according to an embodiment of the present invention. At this time, the third bonding layer (80) is identical to the second bonding layer (70) except for the buffer grid (71) and the layer structure. For convenience of explanation, the buffer grid (71) is expressed in a flat plane.

According to FIG. 4, the third bonding layer (80) includes a buffer grid (71) in the form of a matrix. The buffer grid (71) prevents the porous body (32, 33) from being damaged when a load is applied to the concrete structure (CT). The buffer grid (71) can be made of various materials, but a mesh made of synthetic resin is preferable. The buffer grid (71) withstands the load, and if the buffer grid (71) is a mesh, it exhibits the characteristics of the porous body (32, 33) described above, although there is a difference in degree. The porous body (32, 33) is filled in the space (71a) provided by the buffer grid (71). Accordingly, the third bonding layer (80) is divided into a lower layer (80a), a perforation (70b), and an upper layer (80b). The perforation (70b) absorbs and slowly releases moisture, thereby preventing the third bonding layer (80) from swelling and maintaining adhesion to the putty layer (30).

Figure 5 is a cross-sectional view for explaining a second repainting layer (200) according to an embodiment of the present invention. At this time, the second repainting layer (200) is identical to the first repainting layer (100) except for the buffer layer (90). Accordingly, a detailed description of the overlapping portion will be omitted.

According to FIG. 5, the second repainting layer (200) may include a buffer layer (90) between the primer layer (20) and the concrete structure (CT). The buffer layer (90) includes a surface reinforcing agent, such as an alkaline silicate, to compensate for the lack of penetration and impact-absorbing properties. The buffer layer (90) may be made of a water-soluble resin having excellent penetration, or may mix a cement-based hydraulic inorganic material, such as mortar or cement, with the water-soluble resin. At this time, the water-soluble resin may include an acrylic resin, a urethane resin, an epoxy resin, a vinyl resin, etc. The water-soluble resin has a high bonding strength with the water-soluble resin and organic binder of the buffer layer (90), thereby preventing cracking of the buffer layer (90). The buffer layer (90) increases the penetration of the concrete structure (CT) and prevents cracking of the buffer layer (90), while maintaining the surface reinforcing effect of the concrete structure (CT) including the alkaline silicate for a long period of time.

Above, the present invention has been described in detail with reference to preferred embodiments, but the present invention is not limited to the above embodiments, and various modifications are possible by those skilled in the art within the scope of the technical idea of the present invention.

10; crack 20; primer layer
30; Putty layer 31; Putty layer binder
32; Potassium titanate porous body 33; Potassium titanate porous body
40, 70, 80; 1st to 3rd bonding layers
41; Bonding layer binder 42; Plate-shaped ceramic
50; Coat layer 60; Exterior paint layer
71; Buffer grid 90; Buffer layer

Claims (10)

Primer layer applied on concrete structures and cracks;
A putty layer filled in the above crack and including a porous body; and
Including a coat layer and an exterior paint layer sequentially applied on the primer layer and the putty layer,
The putty layer is formed by including at least one of synthetic resins such as urethane, epoxy and acrylic, or micro cement, and the porous body includes a plurality of pores and comprises 1 to 5 wt% of the total weight of the putty layer.
A repainting layer for a wall of a concrete structure, characterized in that the putty layer includes a bonding layer located inside the putty layer and improving adhesion with the putty layer. A repainting layer for a wall of a concrete structure, characterized in that in the first paragraph, the porous earthenware body includes porous silicon carbide powder, and the silicon carbide powder is contained in an amount of 5 to 50 wt% based on the total weight of the porous earthenware body. A repainting layer for a wall of a concrete structure, characterized in that in claim 1, the putty layer further comprises 1 to 5 wt% of a porous potassium titanate body having a plurality of pores. A repainting layer for a wall of a concrete structure, characterized in that in claim 1, it comprises a buffer layer including a surface reinforcing agent and located between the primer layer and the concrete structure. delete A repainting layer for a wall of a concrete structure, characterized in that in claim 1, the bonding layer includes a ceramic porous body. A repainting layer for a wall of a concrete structure, characterized in that in claim 1, the bonding layer further includes a porous potassium titanate body including a plurality of pores. A repainting layer for a wall of a concrete structure, characterized in that in claim 1, the bonding layer comprises plate-shaped ceramics forming at least one layer while forming a gap (G). A repainting layer for a wall of a concrete structure, characterized in that in claim 8, the plate-shaped ceramics are arranged parallel to each other, inclined, or arranged parallel and inclined to each other. A repainting layer for a wall of a concrete structure, characterized in that in the first paragraph, the bonding layer is divided into a lower layer, an opening, and an upper layer, and the opening is a space provided by a buffer grid.

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