KR20030079223A - Surface treatment method of concrete structure to prevent deterioration - Google Patents

Abstract

PURPOSE: A surfacing method for preventing the deterioration of a concrete structure is provided to improve the affinity and durability of a coating film, to intercept the cause of deterioration such as neutralization, chlorination, freezing and melting, acid rain, gas, acid, etc. and to have excellent adhesive properties and chemical resistance for a long term. CONSTITUTION: The surfacing method for preventing the deterioration of a concrete structure comprises the steps of: polishing with sand paper to remove impurities on the concrete surface; washing with high-pressure water to remove the concrete dust using a high-pressure washer; coating with ceramic surface treatment materials manufactured by mixing ceramic powder and addictive with functional resins; puttying up the hollowed part with putty materials manufactured by adding talc and quartz sand to the same components as the surface treatment materials; decreasing the quantity of the ceramic power added to the surface treatment materials to 28¯50 weight percent, then coating; and placing top coatings manufactured by mixing the ceramic power whose quantity is decreased to 28¯50 weight percent with acryl urethane resins.

Description

Surface treatment method of concrete structure to prevent deterioration

The present invention relates to a surface treatment method for preventing deterioration of a concrete structure and a ceramic surface treatment agent used therein, and more particularly, by applying a ceramic surface treatment agent prepared by mixing ceramics to a functional resin group, thereby providing a resin functional group. Surface treatment method that can improve the affinity and durability of the coating film and close the neutralization, salt, freeze-thawing, acid rain, gas, acid, etc., which are caused by dense irregular bonding with ceramic and hydration reaction by ceramic. It relates to a surface treatment agent used for this.

Civil construction using concrete plays an important role in the national economy as a national infrastructure. Therefore, these concrete structures must be able to be maintained and managed for a long time. However, these concrete structures have a gradual deterioration after construction due to poor physical and chemical environmental conditions, which inevitably leads to significant economic loss due to the inevitable major repair or reconstruction in the middle of the target year. In other words, the conventional concrete structure is a situation that only the importance of the concrete, and the performance is repeated when the performance is degraded due to deterioration is repeated situation.

Therefore, the concrete structure requires a protective device from the beginning that can be maintained for the target period while maintaining the existing role and performance, and this protective device is a surface treatment method made of a permanent and anticorrosive material.

In general, the essential condition of the surface treatment agent is firstly, it should not be peeled off for a long time under any environment, and secondly, it should have the ability to block the penetration of corrosion factors. To achieve both of these conditions, the following requirements must be met:

1) Since concrete is strong alkaline of pH 12 ~ 13, it should be alkaline paint around pH10 for affinity with concrete.

2) The difference between concrete and shrinkage expansion should be approximated.

3) Piers, wells, drains, sewers, and sewage treatment plants are always submerged in water, so they must be water-resistant paints that can withstand water for a long time.

4) It must penetrate into the porous surface of the concrete.

5) Must have ability to block water and gas.

6) Work should be possible regardless of working environment and time. For example, it should be possible to work even at a temperature of 0 ° C. or below, or at a surface moisture content of 8% or more.

7) The structure is always in contact with water, so it should not contain chemicals that are environmental hormones that destroy humans and the natural environment (the epoxy system contains bisphenol A).

8) Aesthetics are also important and should not be discolored for a long time.

As seen above, concrete has a difficult surface treatment unlike steel structures. While most paints have relatively good adhesion performance regardless of anticorrosive performance in steel structures, concrete has excellent adhesion performance even though anticorrosive performance has many problems.

However, the conventional method of applying to a concrete structure has the following fundamental problems, the improvement is required. That is, the conventional paint is a neutral acid paint with a pH of 5-7, so it has no affinity with strong alkaline concretes with a pH of 12.5-13, so it has excellent temporary adhesiveness, but it peels in a short period of time. It can have specific properties but cannot provide various functionalities to achieve its desired performance, and its weather resistance is weak, causing discoloration and premature deterioration of the coating film, and it can not penetrate into the porous surface of the concrete. There is a problem.

In addition, the conventional paint has a large shrinkage expansion ratio with the concrete, which is likely to cause peeling and cracking, and is formed by a constant coordination bond, so that the coating film is weak, and is less than an appropriate standard according to the surface moisture content and the temperature of the concrete. When applied, there are problems such as defects.

The present invention is to solve the conventional problems as described above, the object of the present invention, by applying a ceramic surface treatment agent prepared by mixing the ceramic in the functional resin group, by dense irregular bonding of the resin functional group and the ceramic and ceramic It can improve the affinity and durability of the coating film by the hydration reaction, and can block neutralization, salt, freeze-thawing, acid rain, gas, acid, etc., which causes deterioration, and has excellent long-term adhesion and chemical resistance performance. To provide a surface treatment method for preventing deterioration and the surface treatment agent used therein.

1 illustrates an irregular bond between a resin functional group and a ceramic when the ceramic surface treating agent is applied according to an embodiment of the present invention.

Figure 2 schematically shows a surface treatment method for preventing degradation of the concrete structure according to the present invention.

In order to achieve the above object, the surface treatment method for preventing deterioration of a concrete structure according to the present invention includes a sandpaper polishing step (a) for removing the latency and foreign matter on the concrete surface; (B) a high pressure water washing step of removing dust and dirt from the concrete with a high pressure water washing machine; A coating step (c) for coating a ceramic surface treating agent prepared by blending ceramic powder and additives with the functional resin group after the step (b); (D) putting a putty material, which is prepared by further adding talc and siliceous sand as a weight material to a component such as the surface treating agent, in the recessed portion; A middle coating step (e) of reducing the amount of ceramic powder added to the surface treatment agent by coating 28 to 50% by weight compared to the bottom coating step (c); And a top coat coating step (f) for coating a top coat formed by blending a ceramic powder reduced by 28 to 50% by weight with the acryl urethane resin at the time of the intermediate coating step (e). It is done.

In the surface treatment method for preventing deterioration of a concrete structure according to the present invention, the surface treatment agent used in the step (c) and step (e), 5 to 70% by weight of the vinyl chloride copolymer resin relative to the total weight of the surface treatment agent , 5 to 70% by weight of acrylic resin, 1 to 30% by weight of flexible epoxy resin, 1 to 20% by weight of non-styrene polyester resin, and 5 to 70% by weight of the total surface treatment agent. It is characterized by including a ceramic powder, and a general additive including a light stabilizer, a ultraviolet absorber.

In the surface treatment method for preventing deterioration of a concrete structure according to the present invention, the ceramic added to the surface treatment agent is selected from at least one inorganic group consisting of calcium oxide, magnesium oxide, aluminum oxide, and silica, and a functional resin group. It is characterized by improving the physical properties including the affinity and durability of the coating film by forming an irregular bond with the functional group, and hydration reaction with moisture contained in the concrete.

In the surface treatment method for preventing deterioration of a concrete structure according to the present invention, the vinyl chloride copolymer resin is a copolymer resin of vinyl chloride resin, polyvinylacetate and vinyl alcohol, the molar ratio of the vinyl chloride resin is 87% or more, The polyvinyl acetate has a molar ratio of 3% or more, and a vinyl alcohol having a copolymerization ratio of 3% or more.

Ceramic surface treatment agent for preventing deterioration of concrete structures according to the present invention is a surface treatment agent used in the surface treatment method for preventing degradation of the concrete structure, 5 to 70% by weight of vinyl chloride based on the total weight of the surface treatment agent Functional resin group which mix | blended copolymer resin, 5-70 weight% acrylic resin, 1-30 weight% flexible epoxy resin, 1-20 weight% nonstyrene-type polyester resin, and 5-70 weight with respect to the total weight of a surface treating agent. It is characterized by comprising a common additive including a ceramic powder of%, and a light stabilizer, a ultraviolet absorber.

Hereinafter, the present invention will be described in detail.

In the surface treatment method of the present invention, the ceramic surface treatment agent is applied as a primer, a primer, and a intermediate material, and is composed of an acrylic urethane resin and ceramic powder having excellent chemical resistance, weather resistance, blocking ability of corrosion factors, and crack tracking. The deterioration of the concrete structure is prevented by applying the coated top material.

According to the present invention, various functional resins and ceramics are formed at a constant ratio in order to meet the requirements (general performance) to be provided as the surface treatment described above, thereby improving the performance of the coating film as a synergistic effect by the combination of organic resin and ceramic inorganic powder. Improve and increase durability to completely prevent deterioration of concrete structures.

In the present invention, in particular, it is possible to simultaneously satisfy the adhesiveness, chemical resistance, barrier properties, durability, toughness, impact resistance by blending the various resin groups each having a functional. Since resins have different strengths and weaknesses in terms of performance, if one type of resin is used, the objectives to be attempted can be achieved, but other properties may show weak physical properties. In order to meet, it is ideal to combine various suitable resins to complement the advantages and disadvantages.

Among the functional resin groups included as main components of the ceramic surface treatment agent according to the present invention, vinyl chloride copolymer resin exhibits chemical resistance and adhesiveness, acrylic resin exhibits affinity with weather resistance and concrete, and a flexible epoxy resin coating film. Flexibility to the non-styrene-based polyester resins enhance the adhesion of the coating film.

In particular, the present invention uses a ceramic powder in order to enhance the affinity with the concrete and durability of the coating film.

In the present invention, by adding inorganic ceramics to impart alkalinity around pH 10, the affinity with strong alkaline concrete is enhanced.

In addition, in the present invention, by the chemical reaction between the ceramic and the resin, by the synergistic effect of the inherent adhesive strength and the special adhesive strength of the ceramic, it exhibits strong adhesive strength and strength, wear resistance, corrosion resistance, weather resistance.

When the ceramic surface treatment agent is applied according to an embodiment of the present invention, the resin and the ceramic are vertically linked together to form a dense protective film. The dense protective film structure suppresses the penetration of corrosion factors such as water and salt. do.

In addition, the surface treatment method according to the present invention, even if scratches or scratches due to the longitudinal connection of the resin and the ceramic as described above ends at that point and does not diffuse any more. That is, in the prior art, if a scratch or crack occurs in the coating film, water penetrates into the gap, and if friction with foreign matter occurs, the original scratch or crack part gradually expands and is excited. In addition, the resin and the ceramic exhibit double adhesion performance so that the scratches and cracks no longer greatly expand.

1 illustrates an irregular bond between a resin functional group and a ceramic when the ceramic surface treating agent is applied according to an embodiment of the present invention. As shown in FIG. 1, since -SiO- bonds between functional groups of various resin groups having different molecular weights and inorganic ceramics are not constant coordination bonds as in general paints, and are irregularly formed, inorganic and organic materials are surrounded by each other. A tangled mixture is formed. Since such a mixture is cured for a long time, tough physical properties are not found in ordinary paints.

In particular, the surface treatment method of the present invention does not simply mix the organic resin and the inorganic oxide by atomizing, but crosslinks the organic resin with the ceramic powder to allow the curing reaction to continue for a long time to improve the durability of the coating film.

The ceramic has a latent hydraulic property and absorbs a small amount of water contained in a resin, a pigment, an additive, and the like, which is added during the paint manufacturing process, and undergoes a hydration reaction of the following Chemical Formula 1.

_{3CaO · Al 2 O 3 + 6H} 2 O → 3CaO · Al 2 O 3 · 6H 2 O

2 (3CaOSiO ₂ ) + 6H ₂ O → 3CaO 2SiO ₂ 3H ₂ O + 3Ca (OH) ₂

2 (2CaOSiO ₂ ) + 4H ₂ O → 3CaO 2SiO ₂ 3H ₂ O + Ca (OH) ₂

In particular, when the paint is applied, the moisture contained in the concrete approaches the concrete surface, which is added to promote the hydration reaction. The reaction is completed over several months and completed. In this way, the constitution of the coating film is completed for a long time to ensure the durability of the coating film and to integrate with the concrete.

In the present invention, the surface treatment method is used as a top coating material, using a ceramic of urethane, corrosion resistance, chemical resistance and weather resistance strong with a ceramic.

The present invention, in order to increase the amount of hydration reaction with the moisture in the concrete for the integration with the concrete surface, the amount of hydration reaction with the fine moisture in the concrete by increasing the addition amount of the ceramic powder during coating Increasing the amount of ceramics and reducing the amount of ceramic toward the middle and top, promotes integration with the concrete surface and strengthens the constitution of the coating film.

That is, the ceramic powder is added 5 to 70% by weight based on the total weight of the surface treatment agent, 5 to 70% by weight when applying the undercoat according to the surface treatment method, 2.5 to 50% by weight during the intermediate coating. And the addition amount of the ceramic powder in a coating material shall be 1.25 to 36 weight% with respect to the total weight of the coating material.

On the other hand, the coating film of the surface treating agent containing resin deteriorates early by an ultraviolet-ray. Therefore, in the present invention, the light stabilizer and the ultraviolet absorber are added in an appropriate blending ratio for durability of the coating film, thereby preventing premature degradation and premature discoloration.

As the light stabilizer, HLS (Hindered Amine Light Stabilizer) such as bis (2,2,6,6, -tetramethyl-4-piperidinyl) sebacate is photooxidized by removing the free radicals generated during photolysis. It stops the reaction. HALS is easily oxidized and converted into nitroxyl radicals and reacts with polymeric radicals to produce hydroxyamine ethers. It reacts with radical peroxide and stops the photooxidation reaction by producing stable nitrogen radicals again.

The ultraviolet absorber selectively absorbs ultraviolet energy, converts it into an infrared energy form, emits it, and hydroxy benzophenone, benzotriazole, and acrylate substituents are mainly used. The ultraviolet absorber absorbs light with a wavelength of 250 μm to 400 μm and converts the UV energy into thermal energy. In the present invention, in particular, 2-2-hydroxy-3,5-di-tertaryl-amyl-phenyl-2H-benzotriazole was used as the ultraviolet absorber, but is not limited thereto.

In the surface treatment according to the present invention, in order to prevent neutralization, fly salt, freeze-thawing, acid rain, etc., among the causes of concrete deterioration, the preferred coating frequency is three times, and the film thickness of 100-120 μ is sufficient, and the concrete structure When applied in water or underwater, a coating thickness of 180 to 200 μ is sufficient for 4 to 5 coatings, and a film thickness of 250 to 300 μ for 5 to 6 coatings in the case of the super middle method such as sewage management and sewage treatment plant. Is enough.

In terms of the number of times of coating and the thickness of the coating, it is not effective to increase the number of times of coating in order to reduce the coating process and to increase the thickness of the coating. This is because reducing the number of coatings does not completely remove the pinholes in the coating film. If there is a coating film thickness and the pinholes in the coating film are not completely removed, the corrosion factor penetrates through the pinholes. However, by increasing the number of times of painting, the number of pinholes is gradually eliminated for each number of times of painting, thereby forming a barrier film that completely eliminates penetration of corrosion factors. In summary, the preferred coating specifications according to environmental conditions are shown in Tables 1 to 3 below.

<General Specifications (Neutralization, Flame-Resistant, and Freeze-Fusing)> fair varnish Requirements (kg / ㎡) Thinner dilution rate (%) Coating interval (hr) Dry film thickness (μ) 1 time Surface treatment agent 0.18 to 0.20 50-80 4 30 Episode 2 Surface treatment agent 0.25 10 to 20 7 40 3rd time Topcoat 0.25 5 to 10 - 30

<Medium method (underwater, underwater)> fair Product Name Requirements (kg / ㎡) Thinner dilution rate (%) Coating interval (hr) Dry film thickness (μ) 1 time Surface treatment agent 0.18 to 0.20 50-80 4 30 Episode 2 Surface treatment agent 0.30 10 to 20 4 45 3rd time Surface treatment agent 0.30 5 to 10 7 45 4 times Topcoat 0.25 0 to 5 5 30 5 times Topcoat 0.25 0 to 5 6 30

<Medium-Medium System (Sewage Pipe, End Treatment Plant)> fair Product Name Requirements (kg / ㎡) Thinner dilution rate (%) Coating interval (hr) Dry film thickness (μ) 1 time Surface treatment agent 0.18 to 0.20 50-80 4 30 Episode 2 Surface treatment agent 0.35 10 to 20 4 50 3rd time Surface treatment agent 0.35 10 to 20 7 50 4 times Topcoat 0.25 0 to 5 5 35 5 times Topcoat 0.25 0 to 5 6 35 6 times Topcoat 0.25 0 to 5 7 35

In general, the concrete surface is cured and curvature occurs. There are various materials on the market for this putty (putty), but in the case of water-based putty materials are dissolved and peeled off by the solvent of the oil-based coating material, in the case of the oily putty material of affinity and shrinkage expansion rate of concrete It is easy to peel off by a difference.

In the present invention, in order to solve the above problems, a putty material having the same composition as the ceramic surface treatment agent used for coating the lower and middle materials, and further made by adding talc and 100 to 120 mesh silica as a filler .

The putty material has affinity with the concrete surface, and as a result, the concrete surface, the putty material, and the surface treatment agent are trinitized.

Figure 2 schematically shows a surface treatment method for preventing degradation of the concrete structure according to the present invention.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to the test examples of the present invention. However, the present invention is not limited to these examples.

<Test Example 1: Neutralization Test>

In the early stage of concrete pouring, it shows high alkalinity (pH 12-13), because it contains a large amount of calcium hydroxide (Ca (OH) ₂ ) as a hydration product. Reinforcing bars in reinforced concrete structures in this state have no risk of corrosion. However, when the concrete structure is exposed to the natural environment for a long time, carbon dioxide gas in the air penetrates into the fine pores of the hardened cement paste, reacts with calcium hydroxide to become neutral calcium carbonate, and loses alkalinity of the hardened cement paste. In natural state, the amount of carbon dioxide in the air is 0.03% and the pH value is 9 or less.

In this way, a process in which carbon dioxide gas penetrates into the concrete from the outside is called neutralization or carbonation, and the layer in which the phenomenon occurs is called a neutralization layer or a carbonation layer.

In this test example, neutralization promotion experiments using carbon dioxide (CO ₂ ), which have the greatest effect on the prevention of deterioration and durability of concrete, were performed on the reference specimens and the test specimens according to the present invention. .

1) Test piece production

Four specimens (cement: more = 1: 2) were produced by 50 × 50 × 50 mm (cubic mold), and two were coated with the surface treatment agent according to the present invention three times to prepare test specimens, and not applied to the remaining two. Not used as the standard specimen.

2) Test condition and method

The test was carried out under the conditions of a temperature of 30 ° C., a humidity of 60% RH, a carbon dioxide concentration of 10%, and 3 weeks of accelerated test periods.

The results of the neutralization test are shown in Table 4 below. As shown in the following table, when the ceramic surface treatment agent of the present invention is applied, it can be seen that neutralization does not proceed.

<Test Example 2: Deterioration promotion test after the present invention treatment on the vaporized concrete>

This test example is to find out whether further deterioration can be prevented by applying the surface treatment method according to the present invention to the old concrete subjected to the thermal degradation (neutralization).

The test piece and the test method are the same as in Test Example 1, and the test results are shown in Table 5 below.

As shown in Table 5, when the surface treatment method according to the present invention is applied, it can be seen that the neutralization no longer proceeds even in the case of airlifted concrete. On the other hand, in the results after applying the surface treatment method of the present invention to the air-tightened test specimens, a slight numerical difference of 0.1 mm or less has no color change depending on whether or not the fine aggregate of concrete is neutralized for each test specimen. Is the measurement error.

Test Example 3: Salt Ion Penetration Test

In this test example, chlorine ions were forcibly permeated by electricity, and the resistance of the test specimen according to the present invention and the chlorine ion permeation was measured and analyzed (this test was conducted by the Seoul Institute of Energy and Resource Technology).

The test body was prepared in the same composition as in Table 6 to produce a concrete having a normal strength (240kgf / ㎠).

W / C S / A Unit material amount (kgf / ㎠) water Binder Fine aggregate Coarse aggregate Liquid fire 45 38 158 351 681 1.144 (25 mm) 0.527

In addition, a high strength (450kgf / ㎠) concrete was prepared in the same composition as in Table 7.

W / C S / A Unit material amount (kgf / ㎠) water Binder Fine aggregate Coarse aggregate Liquid fire 35 45 158 450 789 970 (19 mm) 4.5

As a test method, the test was conducted according to ASTM C1202-7 ("Electrical indication of concrete's ability to resist chloride ion penetration") and AASHTO T259, and the results are shown in Tables 8 (normal strength) and Table 9 (high strength). Shown in

Test Subject Passing charge ASTM Standard Range evaluation Reference test body 1,250 1,000 to 2,000 Low range Invention 14.11 100 or less Negligible

Test Subject Passing charge ASTM Standard Range evaluation Reference test body 723.86 100-1,000 Very low range Invention 4.64 100 or less Negligible

As shown in the above results, a numerical value that was negligible in ASTM regulations was also demonstrated in the electric chlorine ion permeation test.

<Test Example 4: Performance test of corrosion resistance of reinforcing bars by forced penetration of saline ion>

In this test example, the brine was infiltrated into the concrete by electricity to determine the corrosion resistance of the rebar (this test was conducted by the Seoul Institute of Energy Resources).

The test body was manufactured in the same manner as in Test Example 3 except that the test body was made to have a circular mold having a diameter of 10 cm and a reinforcing bar having a length of 17 cm and a diameter of 13 mm to have a concrete cover of 2 cm.

The test was conducted with the positive pole of the DC power supply connected to the rebar and the negative pole connected to the 5% NaCl solution, with the test piece height 16 cm and the length immersed in the solution 13 cm. The potential difference between the anode and the cathode not only promotes the penetration of chlorine ions, but also promotes the corrosion of the rebar. Corrosion measurement was based on the method of measuring the amount of current increased due to electrolyte penetration between cracks due to expansion pressure due to reinforcement corrosion. As a device for measuring such a time point, a resistance of 10 kW was connected to each specimen to measure a voltage applied to the resistance and converted into a current.

The test results are shown in Table 10 below.

Rebar Corrosion Time Normal strength High intensity road Reference test body From the beginning of the test After 200 hours Invention After 400 hours After 400 hours

<Test Example 5: Freeze-thawing test>

This test example is to find out the degree of resistance to freeze thaw compared to the standard specimen when the concrete is subjected to repeated freezing and thawing (this test was conducted by an accredited test laboratory).

A concrete test specimen was prepared in the blending ratio of Table 11 below.

Gmax (mm) Slump (cm) S / A (%) W / C (%) Unit compounding amount (kg / ㎠) water Binder Fine aggregate Coarse aggregate Supervision 25 8 50 56 172 308 884 908 1.54

The test method was performed according to KSF 2456, and the results are shown in Table 12 below.

Number of cycles Sample name % Change in weight Length change rate (%) Dynamic modulus change rate (%) 0 Reference test body 100 100 100 Invention Surface Treatment 1 100 100 100 Invention Surface Treatment 1 100 100 100 30 Reference test body 99.65 100.10 90.69 Invention Surface Treatment 1 99.99 99.90 97.44 Invention Surface Treatment 1 100.00 100.00 96.75 60 Reference test body 99.22 98.75 72.72 Invention Surface Treatment 1 100.01 100.00 96.53 Invention Surface Treatment 1 99.99 99.95 96.21 90 Reference test body 99.15 99.05 62.33 Invention Surface Treatment 1 100.01 100.05 96.83 Invention Surface Treatment 1 100.00 99.95 95.71 120 Reference test body 93.69 98.75 54.13 Invention Surface Treatment 1 100.01 100.05 96.02 Invention Surface Treatment 1 100.00 99.90 95.84 150 Reference test body - - - Invention Surface Treatment 1 100.01 100.00 96.46 Invention Surface Treatment 1 100.00 99.95 95.36 180 Reference test body - - - Invention Surface Treatment 1 100.01 99.95 94.69 Invention Surface Treatment 1 100.00 99.95 94.98 210 Reference test body - - - Invention Surface Treatment 1 100.00 99.95 92.65 Invention Surface Treatment 1 100.01 100.00 91.89 240 Reference test body - - - Invention Surface Treatment 1 100.00 99.90 90.56 Invention Surface Treatment 1 100.00 99.95 89.96

In the KS-based freeze-thawing test, if the dynamic modulus is 60%, the test is not worth continuing. In the reference concrete, as the number of test cycles increased, the dynamic elastic modulus dropped sharply, and the elastic modulus dropped sharply to 54.13% at 120 cycles. On the other hand, in the case of applying the surface treatment method of the present invention, it can be seen that the dynamic modulus is almost unchanged even if the number of cycles is increased, and it is negligibly reduced, and the dynamic modulus is 90% even for 240 cycles, which is abnormal in the performance of the structure. There was no shame.

<Test Example 6: Chemical Resistance Test>

In the case of applying the surface treatment method of the present invention, the chemical resistance test shown in Table 13 below showed good results.

Test Items Test Methods result Alkali resistance NaOH 10% concentration for 1 week No abnormality in coating Acid resistance N ₂ SO ₄ 10% concentration immersion for 1 week No abnormality in coating Flameproof NaCl 10% concentration for 3 weeks No abnormality in coating

As shown in the above test example, the present invention is a surface treatment method that can sufficiently prevent the deterioration of the concrete, and is not limited to new concrete, but also applied to the old concrete, which is undergoing thermal degradation, if the deterioration has not reached the reinforcing bars. It can be seen that.

On the other hand, in the prior art, the surface moisture content of the concrete structure is more than 8%, the defect may occur when applied at the air temperature of 5 ℃ or less, in the case of the present invention by the action of the ceramic powder surface moisture content 10 Even if you work at -15% or work below 0 ℃, no defect occurs.

Surface treatment method for preventing deterioration of concrete structures according to the present invention, by applying a ceramic surface treatment agent prepared by mixing the ceramic in the functional resin group, by the dense irregular bonding of the resin functional group and the ceramic and the hydration reaction by the ceramic It can improve the affinity and durability of the coating film, and can block neutralization, salt, freeze-thawing, acid rain, gas, acid, etc., which cause deterioration, and excellent long-term adhesion performance and chemical resistance performance.

In addition, the light stabilizer and the ultraviolet absorber used in the present invention absorbs short-wavelength ultraviolet rays, converts harmful ultraviolet rays into harmless thermal energy, and prevents deterioration of the resin with a synergistic effect of capturing and stabilizing radicals generated in the resin.

The present invention is applied to bridges, dam facilities, power plants, airport facilities, tunnels, etc. to prevent neutralization and freeze-thawing, to prevent salt damage in the case of underwater concrete structures, to prevent environmental hormones by applying to water and sewage pipes, water purification plants, buildings, Applied to apartments, etc. can be used as a countermeasure against acid rain, and can suppress alkali lime of various concrete structures.

Claims (7)

As a method of preventing deterioration of concrete, Sandpaper polishing step (a) to remove the latency and foreign matter on the concrete surface; (B) a high pressure water washing step of removing dust and dirt from the concrete with a high pressure water washing machine; A bottom coat coating step (c) of coating a ceramic surface treating agent prepared by blending a ceramic powder and an additive with a functional resin group after the step (b); (D) putting a putty material, which is prepared by further adding talc and silica sand as a weight material to a composition component, such as the surface treatment agent, in the recessed portion; An intermediate coating step (e) of coating the coating by reducing the amount of ceramic powder added to the surface treatment agent by 28 to 50% by weight compared to the bottom coating step (c); And Concrete structure characterized in that it comprises a top coating step (f) of coating a coating material formed by blending a ceramic powder reduced by 28 to 50% by weight to the resin of the acrylic urethane-based intermediate (e) Surface treatment method to prevent degradation. The method of claim 1, The surface treatment agent used in the step (c) and step (e), 5 to 70% by weight of vinyl chloride copolymer resin, 5 to 70% by weight acrylic resin, 1 to 30% by weight flexible epoxy resin, and 1 to 20% by weight of non-styrene polyester resin based on the total weight of the surface treatment agent One functional resin group, 5 to 70% by weight of ceramic powder with respect to the total weight of the surface treating agent, and A surface treatment method for preventing deterioration of a concrete structure, characterized in that it comprises a light stabilizer, a general additive including a UV absorber. The method according to claim 1 or 2, The ceramic added to the surface treatment agent is at least one selected from the inorganic group consisting of calcium oxide, magnesium oxide, aluminum oxide, and silica, forms irregular bonds with the functional groups of the functional resin group, and hydration reaction with water contained in concrete. Surface treatment method for preventing degradation of the concrete structure, characterized in that to improve the physical properties, including affinity and durability of the coating film. The method according to claim 1 or 2, The vinyl chloride copolymer resin is a copolymer resin of vinyl chloride resin, polyvinylacetate and vinyl alcohol, wherein the molar ratio of vinyl chloride resin is 87% or more, the molar ratio of polyvinyl acetate is 3% or more, and the molar ratio of vinyl alcohol. Surface treatment method for preventing deterioration of concrete structures, characterized in that having a copolymerization ratio of 3% or more. A surface treatment agent used in the surface treatment method for preventing deterioration of the concrete structure of claim 1, 5 to 70% by weight of vinyl chloride copolymer resin, 5 to 70% by weight acrylic resin, 1 to 30% by weight flexible epoxy resin, and 1 to 20% by weight of non-styrene polyester resin based on the total weight of the surface treatment agent One functional resin group, 5 to 70% by weight of ceramic powder with respect to the total weight of the surface treating agent, and A ceramic surface treatment agent for preventing deterioration of a concrete structure, comprising a light stabilizer and a general additive including a UV absorber. The method of claim 5, The ceramic is at least one selected from the inorganic group consisting of calcium oxide, magnesium oxide, aluminum oxide, silica, forms an irregular bond with the functional group of the functional resin group, and the hydration reaction with water contained in the concrete to affinity of the coating film and Ceramic-based surface treatment agent for preventing degradation of the concrete structure, characterized in that to improve the physical properties including durability. The method of claim 5, The vinyl chloride copolymer resin is a copolymer resin of vinyl chloride resin, polyvinylacetate and vinyl alcohol, wherein the molar ratio of vinyl chloride resin is 87% or more, the molar ratio of polyvinyl acetate is 3% or more, and the molar ratio of vinyl alcohol. Ceramic-based surface treatment agent for preventing degradation of the concrete structure, characterized in that having a copolymerization ratio of 3% or more.