KR101315125B1 - Permeable composite for reinforcing and protecting the surface layer of concrete structure, waterproofing method and repairing method of conctrete structure using the composite - Google Patents

Abstract

PURPOSE: A permeable composition for a surface strengthening and a protection of a concrete composition is provided to have an excellent penetration, water resistance, chemical resistance, acid-resistance, durability, salt tolerance, and strength by including silane, butyl methacrylate, methyl methacrylate methyl acrylate, phthalate ester, styrene acryl, and alkali silicate in a specific ratio. CONSTITUTION: A permeable composition for a surface strengthening and a protection of a concrete composition comprises 30-80 weight% of silane, 5-40 weight% of butyl methacrylate, 1-30 weight% of methyl methacrylate, 1-20 weight% of methyl acrylate, 1-20 weight% of phthalate ester 1-15 weight% of styrene acryl, and 0.01-10 weight% of alkali silicate. A water proofing method of the concrete composition comprises the following steps: (a) an impurity and deteriorating part of the concrete composition are removed; (b) The impurity and deteriorating part removed site is sprayed with a primer; and (c) on the top of the primer sprayed site, the permeable composition for the surface strengthening and protecting of concrete composition is applied.

Description

Permeable composite for reinforcing and protecting the surface layer of concrete structure, waterproofing method and repairing method of conctrete structure using the composite}

The present invention relates to a permeable composition for surface layer reinforcement and protection of a crete structure, and a waterproofing and repairing method of a concrete structure using the same. More specifically, the surface of the concrete structure can be strengthened and protected, and the water resistance, chemical resistance, acid resistance, durability, The present invention relates to a permeable composition for surface reinforcement and protection of concrete structures having excellent flame resistance and strength properties, and a waterproofing and repairing method for concrete structures using the same.

In general, concrete structures are known to have a service life of about 50 years. However, when the concrete structure is leaked due to a defect in waterproof performance, the compressive strength, freeze-thaw resistance, resistance to chemical erosion and the like are reduced, and the life of the concrete structure is shortened. Resulting in an economically large loss. Major deterioration of concrete structures due to deterioration due to physical and chemical environmental conditions is inevitable and this causes economic losses.

The surface layer reinforcement and protection material generally used at home and abroad are made of alkali silicate. Such alkali-based silicates form calcium silicates by rapidly reacting with calcium ions, which are the main components of concrete, even though the surface tension is small. These calcium silicates are insoluble and chemically very stable oxides to protect the surface of the concrete, but the penetration is only a few mm has a problem that can not penetrate the interior of the concrete has a disadvantage that is difficult to recover the performance of the concrete structure.

Therefore, there is a need for the development of new surface reinforcement and protective materials with excellent penetration and stable surface reinforcement and protection functions.

The problem to be solved by the present invention is to reinforce and protect the surface of the concrete structure, to provide a permeable composition for strengthening and protecting the surface layer of the concrete structure excellent in water resistance, chemical resistance, acid resistance, durability, flame resistance and strength properties.

Another problem to be solved by the present invention is to strengthen and protect the surface of the concrete structure and to waterproof the concrete structure by using a permeable composition for strengthening and protecting the surface of the concrete structure excellent in water resistance, chemical resistance, acid resistance, durability, flame resistance and strength properties And to provide a waterproofing and repairing method of the concrete structure having excellent permeability and excellent properties in water resistance, chemical resistance, acid resistance, durability, flame resistance and strength by repairing.

The present invention is 30 to 80% by weight of silane, 5 to 40% by weight of butyl methacrylate, 1 to 30% by weight of methyl methacrylate, 1 to 20% by weight of methyl acrylate, 1 to 20% by weight of phthalic ester, styrene acryl It provides a permeable composition for strengthening and protecting the surface layer of a concrete structure, characterized in that it comprises 1 to 15% by weight and 0.01 to 10% by weight of alkali silicate.

The permeable composition for surface layer reinforcement and protection of the concrete structure may further include 0.01 to 3% by weight of polyoxyethylene octiphenyl ether to increase storage stability.

In addition, the permeable composition for strengthening and protecting the surface of the concrete structure may further comprise 0.01 to 5% by weight of dimethyl aniline.

In addition, the permeable composition for strengthening and protecting the surface layer of the concrete structure may further include 0.01 to 10% by weight of acetyl peroxide in order to control the curing time.

In addition, the permeable composition for strengthening and protecting the surface of the concrete structure may further include 0.1 to 15% by weight of polystyrene to improve strength and durability.

In addition, the permeable composition for strengthening and protecting the surface of the concrete structure may further include 0.1 to 15% by weight of styrene-acrylic ester to improve chemical resistance and acid resistance.

In addition, the present invention, the step of removing the impurities and deterioration site by chipping the latans or deterioration site to the concrete structure to be waterproofed, the step of applying a primer to the concrete structure of the part to be waterproofed to remove impurities and deterioration site; It provides a waterproof construction method of the concrete structure comprising the step of spraying the permeable composition for the surface layer reinforcement and protection of the concrete structure on top of the primer is applied.

The primer may be a mixture of 70 to 95% by weight of silane, 3 to 15% by weight of methyl methacrylate, and 2 to 15% by weight of methyl acrylate.

In addition, the present invention, the step of removing the impurities and deterioration site by chipping the site where the concrete structure is deteriorated due to deterioration of the concrete, and applying a primer to the site of the concrete deterioration, and for strengthening and protecting the surface layer of the concrete structure Applying the permeable composition for surface reinforcement and protection of the concrete structure to the upper part of the primer-coated site with a mortar incorporating a permeable composition; Provide remuneration.

The primer may be a mixture of 70 to 95% by weight of silane, 3 to 15% by weight of methyl methacrylate, and 2 to 15% by weight of methyl acrylate.

According to the present invention, it is possible to obtain a permeable composition for strengthening and protecting the surface of a concrete structure having excellent penetration and excellent water resistance, chemical resistance, acid resistance, durability, flame resistance and strength characteristics.

When repairing exposed concrete structures such as bridges, roads and exponential underground concrete structures using the permeable composition for surface reinforcement and protection of concrete structures according to the present invention, the surface reinforcement and protection permeability compositions of concrete structures penetrate deeply into concrete structures. It hardens to fill the fine pores. Therefore, the permeable composition for strengthening and protecting the surface of concrete structures is integrated by filling the cracks, forming a barrier with improved strength up to the depth of reinforcement, and neutralizing with chloride or carbon dioxide, water resistance, weather resistance and freezing along with water blocking effect. It shows an excellent effect of melting.

Hereinafter, preferred embodiments according to the present invention will be described in detail. However, it should be understood that the following embodiments are provided so that those skilled in the art will be able to fully understand the present invention, and that various modifications may be made without departing from the scope of the present invention. It is not.

Permeable compositions for surface reinforcement and protection of concrete structures according to preferred embodiments of the present invention include silane, butyl methacrylate, methyl acrylate, methyl methacrylate, phthalic esters, styrene acrylics and alkali silicates.

The permeable composition for surface reinforcement and protection of the concrete structure is 30 to 80% by weight of silane, 5 to 40% by weight of butyl methacrylate, 1 to 30% by weight of methyl methacrylate, 1 to 20% by weight of methyl acrylate, phthalic ester 1 It is preferable to contain -20 weight%, 1-15 weight% of styrene acryl, and 0.01-10 weight% of alkali silicate.

The permeable composition for surface layer reinforcement and protection of the concrete structure may further include 0.01 to 3% by weight of polyoxyethylene octiphenyl ether to increase storage stability.

In addition, the permeable composition for strengthening and protecting the surface of the concrete structure may further comprise 0.01 to 5% by weight of dimethyl aniline.

In addition, the permeable composition for strengthening and protecting the surface layer of the concrete structure may further include 0.01 to 10% by weight of acetyl peroxide in order to control the curing time.

In addition, the permeable composition for strengthening and protecting the surface of the concrete structure may further include 0.1 to 15% by weight of polystyrene to improve strength and durability.

In addition, the permeable composition for strengthening and protecting the surface of the concrete structure may further include 0.1 to 15% by weight of styrene-acrylic ester to improve chemical resistance and acid resistance.

Hereinafter, the permeable composition for surface reinforcement and protection of a concrete structure according to the present invention will be described in more detail.

The permeable composition for surface reinforcement and protection of concrete structures according to the preferred embodiment of the present invention is 30 to 80% by weight of silane, 5 to 40% by weight of butyl methacrylate, 1 to 30% by weight of methyl methacrylate, 1 to 1 to methyl acrylate. It is preferable to include 20 weight%, 1-20 weight% of phthalic ester, 1-15 weight% of styrene acryl, and 0.01-10 weight% of alkali silicate.

The silane is used to improve water tightness and water resistance. The content of the silane is preferably contained 30 to 80% by weight in the permeable composition for surface strengthening and protection of the concrete structure. When the content of the silane is less than 30% by weight, the effect of improving watertightness and water resistance may be weak. When the content of the silane exceeds 80% by weight, the watertightness and water resistance may be improved, but the price competitiveness may be lowered.

The butyl methacrylate is used to improve ductility. Chemical formula of the butyl methacrylate is H ₂ C = C (CH ₃ ) CO ₂ (CH ₂ ) ₃ CH _{3 It} is softer than methyl methacrylate. The content of the butyl methacrylate is preferably contained in 5 to 40% by weight in the permeation composition for surface strengthening and protection of the concrete structure. When the content of the butyl methacrylate is less than 5% by weight, the ductility improvement effect may be weak. When the content of the butyl methacrylate is more than 40% by weight, the material may be easily separated and the strength may be reduced.

The methyl methacrylate (MMA) has excellent weather resistance, which is resistant to weather and climate, such as sunlight, thereby inhibiting corrosion due to external environmental changes (weather and climate change) and at the same time as a package. It penetrates and integrates to improve adhesion strength and toughness, and to improve colorability by pigments. Methyl methacrylate (MMA) is a colorless transparent liquid, which is prepared by oxidizing Tert-Butyl Alcohol (TBA) prepared from C4 oil in a gaseous state to prepare methacrylic acid, followed by esterification with methanol. It can be prepared by. Methyl methacrylate (MMA) is used in many fields because of its excellent transparency, weatherability and colorability. Polymeric materials have different properties depending on their molecular weight, but methyl methacrylate (MMA) is a hard type and flexible. When polymerizing radically at low temperature, the polymer chain structure has a syndiotactic structure. It shows the characteristic that a ratio increases. In general, acrylic resins have a high coefficient of thermal expansion, but methyl methacrylate (MMA) is one of very high stability. Methyl methacrylate (MMA) is known to have the formula CH ₂ = C (CH ₃ ) CO ₂ CH ₃ . The properties of such methyl methacrylate (MMA) are shown in Table 1 below.

Molecular formula C ₅ H ₈ O ₂ Molar mass 100.12 g / mol Appearance Colorless liquid Density 0.94 g / cm 3 Melting point -48 ℃ (225K) Boiling point 101 ° C (225K) Solubility in water 1.5 g / 100 ml (25 ° C) Viscosity 0.6 cP at 20 ℃

The methyl methacrylate is preferably contained in 1 to 30% by weight in the permeable composition for surface strengthening and protection of the concrete structure. When the content of the methyl methacrylate is less than 1% by weight, effects such as corrosion inhibition, adhesion strength and toughness improvement may be insignificant, and when the content of the methyl methacrylate exceeds 30% by weight, the workability is good because the viscosity is small. The curing time may be long and the strength may be weakened.

The methyl acrylate is used to improve wear resistance and durability. The methyl acrylate is preferably contained 1 to 20% by weight in the permeable composition for surface strengthening and protection of the concrete structure. When the content of the methyl acrylate is less than 1% by weight, the effect of improving wear resistance and durability may be insignificant. When the content of the methyl acrylate is more than 20% by weight, the viscosity is small and the workability is good, but the curing time is long and the strength is high. May weaken.

The phthalic acid ester is used to improve plasticity and prevent material separation. The phthalic acid ester is preferably contained in 1 to 20% by weight in the permeability composition for surface strengthening and protection of the concrete structure. When the content of the phthalic acid ester is less than 1% by weight, the plasticity improvement and material separation prevention effect may be weak, and when the content of the phthalic acid ester exceeds 20% by weight, the mechanical strength may be lowered.

The styrene acryl serves to impart hydrophobicity to the surface strengthening and protective permeable composition of the concrete structure and to impart softness of the surface strengthening and protective permeable composition of the concrete structure. The styrene acrylic is preferably contained 1 to 15% by weight in the permeability composition for surface strengthening and protection of the concrete structure. When the content of the styrene acryl is less than 1% by weight, the effect of imparting hydrophobicity may be weak, and when the content of the styrene acryl is more than 15% by weight, strength and durability may be reduced.

The alkali silicate (R ₂ O.SiO ₂ ) is used to form insoluble calcium silicate and to improve water resistance. The alkali silicate may use at least one material selected from potassium silicate and lithium silicate. Sodium silicate in alkali silicate is generally used because it forms insoluble calcium silicate by substitution with potassium ions when used as a water-retaining material in concrete, but in the present invention, in order to realize excellent water resistance It is preferable to use at least one material selected from calcium silicate and lithium silicate, which has better water resistance than sodium silicate. The alkali silicate is preferably contained in 0.01 to 10% by weight in the permeable composition for surface strengthening and protection of the concrete structure. When the content of the alkali silicate is less than 0.01% by weight, the effect of improving water resistance may be weak, and when the content of the alkali silicate is 10% by weight, the strength may be lowered.

The permeable composition for surface reinforcement and protection of the concrete structure may further include polyoxyethylene octiphenyl ether in order to increase storage stability. The polyoxyethylene octiphenyl ether is used to improve the penetration and diffusion rate of the permeable composition for surface reinforcement and protection of the concrete structure, and to improve dispersion and storage stability. The polyoxyethylene octyphenyl ether is preferably contained in 0.01 to 3% by weight in the permeation composition for surface strengthening and protection of the concrete structure. When the content of the polyoxyethylene octiphenyl ether is less than 0.01% by weight, the effect of improving dispersion and storage stability may be insignificant. When the content of the polyoxyethylene octiphenyl ether exceeds 3% by weight, the surface layer of the concrete structure The penetration and diffusion rates of the reinforcing and protective permeable compositions are improved and the dispersion and storage stability of the compositions are improved but the initial workability may be poor.

In addition, the permeable composition for surface strengthening and protection of the concrete structure may further include dimethyl aniline (dimethyl aniline) to promote the reaction. The dimethyl aniline is preferably contained in 0.01 to 5% by weight in the permeable composition for surface strengthening and protection of the concrete structure. When the content of the dimethyl aniline is less than 0.01% by weight, the workability may be improved, but curing may be delayed. When the content of the dimethyl aniline is more than 5% by weight, the reaction may be accelerated to shorten the pot life.

In addition, the permeable composition for surface reinforcement and protection of the concrete structure may further include acetyl peroxide to control the curing time. The acetyl peroxide is preferably contained in 0.01 to 10% by weight of the permeable composition for surface strengthening and protection of the concrete structure. When the content of the acetyl peroxide exceeds 10% by weight, the reaction may be shortened and the pot life may be shortened.When the content of the acetyl peroxide is less than 0.01% by weight, the workability may be improved, but curing may be delayed, and thus, early strength may be difficult to express. have.

In addition, the permeable composition for surface strengthening and protection of the concrete structure may further include polystyrene. The polystyrene is used to improve strength and durability. The polystyrene is preferably contained in 0.1 to 15% by weight in the permeable composition for surface strengthening and protection of the concrete structure. When the content of the polystyrene exceeds 15% by weight, the strength and durability are improved, but brittleness is likely to occur, and when the content of the polystyrene is less than 0.1% by weight, the effect of improving the strength and durability may be weak.

In addition, the permeable composition for surface strengthening and protection of the concrete structure may further include a styrene-acrylic ester. The styrene-acrylic ester is used to enhance chemical resistance and acid resistance. The styrene-acrylic ester is preferably contained in 0.1 to 15% by weight in the surface permeability and protective permeable composition of the concrete structure, if the content of the styrene-acrylic ester exceeds 15% by weight permeability and surface permeability of the concrete structure The performance of the composition may be improved, but the price may be inferior. When the content of the styrene-acrylic ester is less than 0.1% by weight, the workability of the permeable composition for surface strengthening and protection of concrete structures may be improved, but the chemical and acid resistance enhancing effects may be weak. have.

Hereinafter, the waterproof method and repair method of the concrete structure according to the preferred embodiment of the present invention. Hereinafter, the concrete structure refers to a chemical plant, a food factory, a related structure such as a barn floor, a marine concrete structure, a building structure, a sewage treatment plant, a swimming pool, an underwater concrete structure, an index structure, a repair structure, an underground structure, a sewage pipe, The road surface, bridge bridge, concrete slab of bridges, new bridge joints, precast products, etc. are used to mean a structure made of concrete.

Waterproofing method of a concrete structure according to a preferred embodiment of the present invention, the step of removing the impurities and deterioration site by chipping the latans or deterioration site to the concrete structure to be waterproofed, and to remove the impurities and deterioration site And applying a primer to the concrete structure and spraying a permeable composition for surface reinforcement and protection of the concrete structure on top of the site where the primer is applied.

Hereinafter, the primer is used to mean a material for facilitating adhesion of the permeable composition for surface reinforcement and protection of the concrete structure to the concrete structure. The primer may be a mixture of 70 to 95% by weight of silane, 3 to 15% by weight of methyl methacrylate, and 2 to 15% by weight of methyl acrylate.

Another method for repairing a concrete structure according to the preferred embodiment of the present invention includes the steps of removing the impurities and the deterioration site by chipping the site where the concrete is deteriorated due to deterioration of the concrete structure, and applying a primer to the deteriorated site of the concrete; , Applying the upper surface of the primer-coated region with a mortar incorporating the surface-permeable and protective permeable composition of the concrete structure, and applying the surface-permeable and protective permeable composition of the concrete structure to the mortar-coated portion. Include.

The primer is a material for facilitating adhesion of the permeable composition for surface reinforcement and protection of the concrete structure to the concrete structure. The primer may be a mixture of 70 to 95% by weight of silane, 3 to 15% by weight of methyl methacrylate, and 2 to 15% by weight of methyl acrylate.

The mortar may include 0.1 to 25% by weight of the permeable composition for surface layer reinforcement and protection of the concrete structure, 5 to 45% by weight cement-based binder, 25 to 65% by weight of fine aggregate and 0.5 to 10% by weight of water. The cement-based binder may include 10 to 70% by weight of Portland cement, 20 to 80% by weight of bottom ash, 1 to 20% by weight of fly ash and 0.5 to 10% by weight of gypsum.

Hereinafter, the embodiments of the water-soluble composition for strengthening and protecting the surface of the concrete structure according to the present invention are presented in more detail, and the present invention is not limited by the following examples.

≪ Example 1 >

45 wt% silane, 20 wt% butyl methacrylate, 10 wt% methyl methacrylate, 10 wt% methyl acrylate, 5 wt% phthalic ester, 3 wt% styrene acrylic, 3 wt% alkali silicate, polyoxyethylene octy 2% by weight of phenyl ether, 1% by weight of dimethyl aniline, and 1% by weight of acetyl peroxide were prepared to prepare a permeable composition for strengthening and protecting the surface of a concrete structure.

<Example 2>

40 wt% silane, 20 wt% butyl methacrylate, 10 wt% methyl methacrylate, 10 wt% methyl acrylate, 5 wt% phthalic ester, 5 wt% styrene acrylic, 5 wt% alkali silicate, polyoxyethylene octy 3% by weight of phenyl ether, 1% by weight of dimethyl aniline, and 1% by weight of acetyl peroxide were prepared to prepare a permeable composition for strengthening and protecting the surface of a concrete structure.

<Example 3>

35 wt% silane, 25 wt% butyl methacrylate, 10 wt% methyl methacrylate, 10 wt% methyl acrylate, 5 wt% phthalic ester, 5 wt% styrene acrylic, 5 wt% alkali silicate, polyoxyethylene octy 3% by weight of phenyl ether, 1% by weight of dimethyl aniline, and 1% by weight of acetyl peroxide were prepared to prepare a permeable composition for strengthening and protecting the surface of a concrete structure.

Hereinafter, test results for evaluating the physical properties of the permeable composition for surface reinforcement and protection of the concrete structure manufactured according to Examples 1 to 3 will be described.

Experimental Example 1 Preparation of Test Specimen

The penetrating composition for surface reinforcement and protection of the concrete structure prepared according to Examples 1 to 3 was applied to three concrete specimens having a diameter of 150 mm × 40 mm for 20 g of the surface layer reinforcement and protection composition for 20 days for 14 days. Cured in a constant temperature and humidity room of ± 2 ℃, relative humidity 65 ± 5% (RH).

Penetration depth is divided into two according to KS F 4930 (liquid absorption inhibitor for concrete surface coating), spray water on the cross section, and differentiate according to the thickness of the part where water penetrated and the difference in the surface color of the part where water does not penetrate. The thickness to be measured was measured. The measurement measured the penetration depth of 3 places about three test bodies, and the average value was shown as penetration depth, and the result is shown in Table 3.

In addition, the water absorption performance is to strengthen the surface layer and protect the 20g concrete structure on five concrete specimens of 150mm × 40mm after waterproofing the surface of the test specimen with epoxy resin according to KS F 2609 (Method of Measuring Water Absorption Coefficient of Building Materials). After the permeable composition was applied, it was cured in a constant temperature and humidity room at 20 ± 2 ° C. and a relative humidity of 65 ± 5% (RH) for 14 days. Each weight was measured in units of 0.1 g, and the water was deposited at a depth of about 2 to 10 mm in water of about 20 ° C., and then weighed for 10 minutes, 30 minutes, 1 hour, 6 hours, and 24 hours after deposition. When the weight was measured, the test body was taken out and the water on the surface was removed. Water absorption coefficient was calculated by calculating the slope of the solid line of the measured value and the results are shown in Table 3.

The concrete used in the experiment was prepared in the mixing ratio shown in Table 2 to produce the specimen under the same mixing conditions.

Coarse aggregate maximum size
(mm) slump
(cm) Air volume
(%) Water-cement ratio (%) Fine Aggregate Rate (%) Unit weight (kg / ㎥) water cement Fine aggregate Coarse aggregate Admixture 19.0 12 4.0 52.0 35.0 176.8 340 624 1160 0.8

Test Items Example 1 Example 2 Example 3 Penetration depth (mm) 12.2 12.0 11.5 Water absorption coefficient ratio 0.02 0.03 0.03

Experimental Example 2 Strength Test

Impregnating the permeable composition for the surface layer reinforcement and protection of the concrete structure prepared according to Examples 1 to 3 by impregnating the concrete produced at the compounding ratio shown in Table 2 for 20 days at 20 ± 2 ℃, relative humidity 65 ± 5% ( RH) was cured in a constant temperature and humidity room.

In order to compare the mechanical properties of the uncoated specimens and the application of the permeable composition for surface reinforcement and protection of concrete structures prepared according to Examples 1 to 3, the compressive strength by KS F 2405 (method of testing the compressive strength of concrete) The test was carried out and the results are shown in Table 4 below.

In addition, the flexural strength test was carried out by KS F 2408 (conductivity test method of concrete), tensile strength was measured by KS F 2423 (conductivity test method of concrete), and the results are shown in Table 4 below.

Test Items Comparative Experiment for Example 1 Comparative Experiment for Example 2 Comparative Experiment for Example 3 Impregnation
(Example 1) No impregnation
(Comparative Example) Impregnation
(Example 2) No impregnation
(Comparative Example) Impregnation
(Example 3) No impregnation
(Comparative Example) burglar
(kgf / cm2) warp 88 48 85 48 83 48 compression 425 342 415 342 409 342 Seal 52 30 50 30 49 30

In Table 4, impregnation is a case of applying the permeable composition for surface reinforcement and protection of the concrete structure prepared according to Examples 1 to 3 to the concrete test body, the non-impregnation is a comparative example of the embodiment of the surface layer reinforcement and Refers to the case where the protective permeable composition is not applied to the concrete test specimen.

As shown in Table 4, the flexural, compressive and tensile strength of the concrete coated with the permeable composition for surface reinforcement and protection of the concrete structure prepared according to Examples 1 to 3 was higher than that without applying. It was confirmed that the impregnated with the permeable composition for surface reinforcement and protection of the concrete structure prepared according to Examples 1 to 3 was excellent in strength.

Experimental Example 3 Neutralization Depth and Chloride Ion Penetration Depth

Impregnating the permeable composition for surface layer reinforcement and protection of the concrete structure prepared according to Examples 1 to 3 by impregnating the concrete produced at the compounding ratio shown in Table 2 for 20 days at 20 ± 2 ℃, relative humidity 65 ± 5% ( RH) was cured in a constant temperature and humidity room.

In order to compare the durability characteristics of the uncoated test specimen and the application of the permeable composition for surface reinforcement and protection of the concrete structure prepared according to Examples 1 to 3, the test specimen was prepared according to JIS A 1171 (polymer cement mortar test method). After settling in a daily accelerated neutralization test apparatus [30 ° C, 60% (RH), CO ₂ concentration 5.0%], the test body was divided into 2 parts, and a 1% alcohol solution of phenolphthalein was sprayed on the cross section to neutralize the part that does not turn red. The neutralization depth was measured as a part. The results are shown in Table 5.

In addition, the chloride ion permeation test was carried out by immersing the test body in a 2.5% aqueous solution of 2.5% sodium chloride at 20 ° C. for 7 days according to JIS A 1171, and then dividing the test body into two parts, and spraying a 0.1% aqueous solution of sodium prolacrosene and 0.1 N silver acetate on the cross-section to fluoresce the fluorescent particles. Chloride ion permeation depth was measured using the part which emits chloride as the chloride ion (Cl ⁻ ) penetration part, and the results are shown in Table 5.

Test Items Comparative Experiment for Example 1 Comparative Experiment for Example 2 Comparative Experiment for Example 3 Impregnation
(Example 1) No impregnation
(Comparative Example) Impregnation
(Example 2) No impregnation
(Comparative Example) Impregnation
(Example 3) No impregnation
(Comparative Example) Neutralization Depth (mm) 0.03 4.0 0.03 4.0 0.31 4.0 Chloride ion penetration depth (mm) 0.06 6.5 0.07 6.5 0.07 6.5

In Table 5, impregnation is a case of applying the permeable composition for surface reinforcement and protection of the concrete structure prepared according to Examples 1 to 3 to the concrete test body, unimpregnation is a surface layer reinforcement and Refers to the case where the protective permeable composition is not applied to the concrete test specimen.

As shown in Table 5, the neutralization depth and chloride ion penetration depth of the concrete impregnated with the permeable composition for surface reinforcement and protection of the concrete structure prepared according to Examples 1 to 3 is a permeable composition for surface reinforcement and protection of the concrete structure It was found to be 1/2 and 1/3 lower than unimpregnated, respectively. It was confirmed that the impregnated with the permeable composition for surface reinforcement and protection of the concrete structure prepared according to Examples 1 to 3 was excellent in neutralization and salting.

Experimental Example 4 Water Resistance

Specimens coated and uncoated using the method given in JIS A 1171 (Test Method of Polymer Cement Mortar) to confirm that the permeable composition for surface reinforcement and protection of concrete structures prepared according to Examples 1 to 3 was water resistant. The water absorption of was measured and the results are shown in Table 6 below.

Test Items Comparative Experiment for Example 1 Comparative Experiment for Example 2 Comparative Experiment for Example 3 Impregnation
(Example 1) No impregnation
(Comparative Example) Impregnation
(Example 2) No impregnation
(Comparative Example) Impregnation
(Example 3) No impregnation
(Comparative Example) Water Resistance,
Absorption rate (%) 0.02 4.4 0.02 4.4 0.02 4.4

In Table 6, impregnation is a case of applying the permeable composition for surface reinforcement and protection of the concrete structure prepared according to Examples 1 to 3 to the concrete test body, unimpregnation is a comparative example of the embodiment of the surface layer reinforcement and Refers to the case where the protective permeable composition is not applied to the concrete test specimen.

As shown in Table 6, the water resistance of the concrete impregnated with the surface reinforcement and protection for concrete structures prepared according to Examples 1 to 3 than the impregnated with the surface layer reinforcement and protection for concrete structures 1/5 lower. It was confirmed that the impregnated with the permeable composition for surface reinforcement and protection of the concrete structure prepared according to Examples 1 to 3 was excellent in water resistance.

Experimental Example 5 Weather Resistance

The accelerated weathering test was conducted by ASTM (Designation: G26-Nonmetallic Materials). The test apparatus is a Xenon-Arc Type water-cooled apparatus and belongs to Type A.

The test conditions were 40 ° C. and 60% RH, so that only 51 minutes of light was emitted, 9 minutes of light and water were sprayed, and one cycle was 60 minutes, and 2000 cycles were applied. Table 7 shows the weather resistance results of the coated and uncoated specimens.

Test Items Comparative Experiment for Example 1 Comparative Experiment for Example 2 Comparative Experiment for Example 3 Impregnation
(Example 1) No impregnation
(Comparative Example) Impregnation
(Example 2) No impregnation
(Comparative Example) Impregnation
(Example 3) No impregnation
(Comparative Example) Weatherability No change Change No change Change No change Change

In Table 7, the impregnation is a case of applying the permeable composition for surface reinforcement and protection of the concrete structure prepared according to Examples 1 to 3 to the concrete test body, the non-impregnation is the surface layer reinforcement and Refers to the case where the protective permeable composition is not applied to the concrete test specimen.

As shown in Table 7, as a result of the weather resistance test of concrete impregnated with the surface layer reinforcement and the protective permeable composition of the concrete structure prepared according to Examples 1 to 3, there was no change on the surface, but the surface layer reinforcement of the concrete structure And the impregnation of the protective permeable composition showed cracking and yellowing on the surface.

Experimental Example 6 Freeze Melting Resistance

The freeze-thaw test was carried out on the freeze-thaw test specimens in accordance with KS F 2456 (Test method for the resistance of concrete to rapid freeze-thaw). Table 8 shows the results of freezing and thawing resistance of the coated and uncoated specimens.

Test Items Comparative Experiment for Example 1 Comparative Experiment for Example 2 Comparative Experiment for Example 3 Impregnation
(Example 1) No impregnation
(Comparative Example) Impregnation
(Example 2) No impregnation
(Comparative Example) Impregnation
(Example 3) No impregnation
(Comparative Example) Durability index 96 60 95 60 95 60

In Table 8, impregnation is a case of applying the permeable composition for surface reinforcement and protection of the concrete structure prepared according to Examples 1 to 3 to the concrete test body, and the impregnation is a comparative example of the embodiment of the surface layer reinforcement and Refers to the case where the protective permeable composition is not applied to the concrete test specimen.

As shown in Table 8, as a result of the freeze-melt resistance test of the concrete impregnated with the permeable composition for surface reinforcement and protection of the concrete structure prepared according to Examples 1 to 3, the permeable composition for surface reinforcement and protection of the concrete structure The results were much better than those without impregnation. It can be seen that the permeable composition for surface layer reinforcement and protection of the concrete structure prepared according to Examples 1 to 3 is excellent in freezing and thawing resistance.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, This is possible.

Claims (10)

30 to 80 wt% silane, 5 to 40 wt% butyl methacrylate, 1 to 30 wt% methyl methacrylate, 1 to 20 wt% methyl acrylate, 1 to 20 wt% phthalic ester, 1 to 15 wt% styrene acrylic Permeable composition for strengthening and protecting the surface of a concrete structure, characterized in that it comprises% and 0.01 to 10% by weight of alkali silicate.
The permeable composition for surface reinforcement and protection of a concrete structure according to claim 1, further comprising 0.01 to 3% by weight of polyoxyethylene octiphenyl ether in order to increase storage stability.
The penetrating composition for surface reinforcement and protection of a concrete structure according to claim 1, further comprising 0.01 to 5% by weight of dimethyl aniline.
The method of claim 1, wherein in order to control the curing time of the permeable composition for strengthening and protecting the surface layer of the concrete structure further comprises 0.01 to 10% by weight of acetyl peroxide.
The method of claim 1, wherein in order to improve the strength and durability, polystyrene further comprises 0.1 to 15% by weight of the permeable composition for strengthening and protecting the surface of the concrete structure.
The penetrating composition for surface reinforcement and protection of a concrete structure according to claim 1, further comprising 0.1 to 15% by weight of styrene-acrylic ester to enhance chemical resistance and acid resistance.
Removing impurities and deterioration sites by chipping the latans or deterioration sites on the concrete structure to be waterproofed; And
Applying a primer to the concrete structure of the part to be waterproofed from which impurities and deterioration parts are removed; And
Spraying the permeable composition for surface layer reinforcement and protection of the concrete structure according to claim 1 on top of the primer is applied to the waterproofing method of the concrete structure.
According to claim 7, wherein the primer is a waterproof method of the concrete structure, characterized in that using a mixture of 70 to 95% by weight of silane, 3 to 15% by weight of methyl methacrylate and 2 to 15% by weight of methyl acrylate. .
Removing the impurities and the deterioration site by chipping the site where the concrete structure is deteriorated so that the concrete is dropped;
Applying a primer to the concrete deteriorated site;
Applying to the upper portion of the primer-coated site with a mortar incorporating a permeable composition for strengthening and protecting the surface of the concrete structure according to claim 1; And
The method of repairing a concrete structure comprising the step of applying a permeable composition for strengthening and protecting the surface layer of the concrete structure according to claim 1 to the mortar is applied.
The method of claim 9, wherein the primer is 70 to 95% by weight of silane, 3 to 15% by weight of methyl methacrylate and 2 to 15% by weight of methyl acrylate, the repair method of the concrete structure, characterized in that .