KR101674470B1 - Coating material composition for protecting surface of concrete structure, and construction method of protecting surface of concrete structure using the same - Google Patents
Coating material composition for protecting surface of concrete structure, and construction method of protecting surface of concrete structure using the same Download PDFInfo
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- KR101674470B1 KR101674470B1 KR1020160018516A KR20160018516A KR101674470B1 KR 101674470 B1 KR101674470 B1 KR 101674470B1 KR 1020160018516 A KR1020160018516 A KR 1020160018516A KR 20160018516 A KR20160018516 A KR 20160018516A KR 101674470 B1 KR101674470 B1 KR 101674470B1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/4598—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with waste materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/466—Halogenated compounds, e.g. perfluor-compounds
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/48—Macromolecular compounds
- C04B41/4853—Epoxides
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/64—Insulation or other protection; Elements or use of specified material therefor for making damp-proof; Protection against corrosion
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
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Abstract
The present invention relates to a coating composition for surface protection of a concrete structure and a method for surface protection of a concrete structure using the same, which is excellent in adhesion performance and durability to a concrete structure, excellent in chemical resistance, water resistance and salt resistance, Provided is a coating composition for surface protection of a concrete structure having excellent corrosion resistance against environment, inhibition of microbial growth, improvement in weatherability, surface strength and stain resistance, and excellent surface protection effect of concrete structure, and a concrete construction method for concrete structure using the composition do.
Description
TECHNICAL FIELD The present invention relates to a coating composition for protecting the surface of a concrete structure and a method for surface-protecting a concrete structure using the same, and is excellent in adhesion performance and durability to a concrete structure and a steel structure surface and also has excellent chemical resistance, water resistance, , A coating composition for surface protection of a concrete structure having excellent corrosion resistance against an acidic environment, inhibition of microbial growth, improvement in weatherability, surface strength and stain resistance, and excellent surface protection effect of concrete and steel structure, and surface protection It relates to construction method.
In general, when an architectural structure, especially a concrete structure made of concrete, is left in a concrete state without surface treatment, moisture permeates through the minute cracks generated on the concrete surface, and the water penetrated in the winter season is frozen, . The cracked concrete structure is not only deteriorated in strength of the concrete itself but also becomes in contact with the moisture in the inner reinforcing steel, and when the inner reinforcing steel is corroded, the strength of the concrete structure is rapidly lowered, And the durability is deteriorated as time elapses, so that the function as a building is lost. Especially, when built on the beach, it is often infiltrated with salt, and when it is built in factory wastewater area or sewage area, serious durability deteriorates due to penetration by various chemicals. For example, aging of structures can be promoted if the concrete structure is in contact with acidic atmospheric environments, where sulfuric acid compounds such as hydrogen sulphide are present in large amounts, or direct acid wastewater.
In addition, due to the acidic conditions generated by the action of microorganisms in sewage treatment facilities and sewage pipes, deterioration of concrete structures may occur and erosion may occur.
As a method for preventing the durability of such a concrete structure from being weakened, a method of applying an anti-absorption agent or a coating liquid to the surface of the concrete is used. The method of using the absorption inhibitor has used a paraffinic hydrocarbon compound or an absorption inhibitor composed of a fatty acid-based oil, but it has not been effective in securing penetration depth and is not effective in improving durability. Another method is to use water repellent or absorbing agent prepared by diluting silicone resin or oil in an organic solvent. However, due to the nature of the solvent, it is currently used because of the problem of pollution and adverse effects on human body.
In addition, the coating liquid has conventionally been mixed with an acrylic resin-based polymer and used as a filler. However, the coating liquid is insufficient in physical properties such as adhesion strength, durability and compressive strength to the base material concrete.
On the other hand, Korean Patent Publication No. 2008-0094427 discloses a method for improving the adhesion with a conductor by using a blast furnace slag having high affinity to iron and cement as a filler, and by adding a soft resin, And a coating agent capable of enhancing the adhesion to the conductor by increasing the vibration proofing property and lowering the curing rate by using an alkali metal hydroxide as a curing agent.
Korean Patent No. 10-0937632 discloses a fluorine-containing surfactant which is excellent in antistatic property and anti-dust adhesion property on the surface of a coating film in order to solve the problem that resistance of the existing coating composition to contamination is low, And a coating agent for improving chemical resistance and mildew resistance.
However, although conventional coatings have some advanced aspects in terms of adhesion strength, they are required to have further improved properties such as durability, chemical resistance, water resistance, and resistance to salt corrosion. Further, There was a great need for further technology development in relation to the suppression technology for microbial propagation.
The present invention has been developed in consideration of the situation of the prior art as described above, and it is an object of the present invention to provide a concrete structure which is excellent in adhesion and durability to a surface of a concrete structure and has excellent properties such as chemical resistance, water resistance, The present invention relates to a coating composition for surface protection of a concrete structure having excellent corrosion resistance against an acidic environment, inhibition of microbial growth, improvement in weatherability, surface strength and stain resistance, .
In order to achieve the above object,
(1) 1 to 7 parts by weight of methyl methacrylate, 5 to 20 parts by weight of styrene monomer, 1 to 10 parts by weight of n-butyl acrylate, 0.1 to 10 parts by weight of methyl acrylate and 0.1 to 10 parts by weight of isobornyl acrylate A first liquid phase component;
(2) 0.05 to 5 parts by weight of an initiator and 0.05 to 5 parts by weight of an emulsifier;
(3) a third component comprising 0.1 to 5 parts by weight of potassium methylsiliconate, 0.1 to 5 parts by weight of dimethyl ammonium chloride, 0.1 to 10 parts by weight of an epoxy-based binder resin and 0.1 to 5 parts by weight of an inorganic polymer containing a fluorine (F) Liquid component;
(4) 0.5 to 10 parts by weight of clinker, 1 to 10 parts by weight of gypsum (excluding anhydrous gypsum), 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of anhydrous gypsum, 0.1 to 5 parts by weight of silica fume, 5 to 10 parts by weight of limestone, 0.01 to 5 parts by weight of slag, 0.01 to 10 parts by weight of a calcined pozzolan and 0.01 to 10 parts by weight of microsilica;
(5) a second powder component comprising 10 to 50 parts by weight of oyster shell powder, 5 to 20 parts by weight of purified water sludge powder, 5 to 20 parts by weight of waste glass powder and 10 to 40 parts by weight of waste stone powder;
(6) a third powder component consisting of a super active clay powder having a particle size of 100 to 400 mesh;
And,
Wherein the first liquid component, the second liquid component and the third liquid component are mixed at a weight ratio of 50: 95: 5 to 50: 0.1 to 10, and the first powder component 2 to 5 By weight of the first powder component, 3 to 8 parts by weight of the second powder component, and 0.1 to 5 parts by weight of the third powder component.
In one embodiment of the present invention, the potassium methylsiliconate of (3) is characterized by a solid content of 30 to 40% by weight and a pH of 12 to 14.
In one embodiment of the present invention, the mixture of 100 parts by weight of the natural pozzolana of (4) above and 1 to 20 parts by weight of calcium is calcined at 1000 to 1200 ° C for 0.5 to 1 hour, 10 to 20 占 퐉.
In one embodiment of the present invention, the superactive clay powder of (6) contains 500 to 800 ppm of CaO and 300 to 400 ppm of P 2 O 5 .
In one embodiment of the present invention, the inorganic polymer containing the fluorine (F) group of the above (3) is characterized in that the mixture of the aluminosilicate and the fluoroalkali silicate is mixed in a weight ratio of 50: 65: 35 to 50: do.
In order to achieve the above object,
(a) preparing a coating composition for surface protection of concrete structures by mixing each component of the coating composition for surface protection of a concrete structure according to the present invention;
(b) grinding and polishing the surface of the concrete structure to be applied; And
(c) applying and curing the coating composition for surface protection of a concrete structure prepared in the step (a) to the surface to be trimmed;
The present invention also provides a surface protection method for a concrete structure.
According to the present invention, it is excellent in adhesion and durability to the surface of a concrete structure, and particularly excellent in properties such as chemical resistance, water resistance and salt resistance, and thus has excellent surface protection effect of a concrete structure.
In addition, since the liquid components are separated from each other and the powder components are used separately from each other, the composition is not hardened even when stored for a long time and thus the storage stability is excellent. Since each component is mixed before use, And it is advantageous to prevent material loss and environmental pollution due to remaining materials.
In addition, it is excellent in corrosion resistance against acidic environment, in particular, inhibits the growth of microorganisms, prevents the problem of surface strength deterioration due to microorganisms, and has an effect of improving the weatherability and surface strength of the concrete structure, There is an advantage that it can be maintained.
Hereinafter, the present invention will be described in more detail.
First, the coating composition for surface protection of concrete structures according to the present invention comprises the following components.
(1) 1 to 7 parts by weight of methyl methacrylate, 5 to 20 parts by weight of styrene monomer, 1 to 10 parts by weight of n-butyl acrylate, 0.1 to 10 parts by weight of methyl acrylate and 0.1 to 10 parts by weight of isobornyl acrylate A first liquid phase component;
(2) 0.05 to 5 parts by weight of an initiator and 0.05 to 5 parts by weight of an emulsifier;
(3) a third component comprising 0.1 to 5 parts by weight of potassium methylsiliconate, 0.1 to 5 parts by weight of dimethyl ammonium chloride, 0.1 to 10 parts by weight of an epoxy-based binder resin and 0.1 to 5 parts by weight of an inorganic polymer containing a fluorine (F) Liquid component;
(4) 0.5 to 10 parts by weight of clinker, 1 to 10 parts by weight of gypsum (excluding anhydrous gypsum), 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of anhydrous gypsum, 0.1 to 5 parts by weight of silica fume, 5 to 10 parts by weight of limestone, 0.01 to 5 parts by weight of slag, 0.01 to 10 parts by weight of a calcined pozzolan and 0.01 to 10 parts by weight of microsilica;
(5) a second powder component comprising 10 to 50 parts by weight of oyster shell powder, 5 to 20 parts by weight of purified water sludge powder, 5 to 20 parts by weight of waste glass powder and 10 to 40 parts by weight of waste stone powder;
(6) a third powder component consisting of a super active clay powder having a particle size of 100 to 400 mesh;
.
At this time, the first liquid component, the second liquid component and the third liquid component are mixed at a weight ratio of 50: 95: 5 to 50: 0.1 to 10, and based on 100 parts by weight of the mixed liquid component, 2 to 5 parts by weight of the second powder component, 3 to 8 parts by weight of the second powder component and 0.1 to 5 parts by weight of the third powder component.
The present inventor has found that when a previously registered patent (Korean Patent No. 10-1527702) is applied to the surface of a concrete structure, it has excellent adhesion to a concrete surface and adhesion durability, resistance to chemical resistance, water resistance and saltiness The coating agent proposed in the above patent is particularly useful for marine structures such as slabs, beams, breakwaters and the like of harbors with enhanced resistance to salting. Due to its high strength properties, it can be used in nuclear power plants or nuclear waste disposal plants.
However, although the coating composition for concrete surface protection proposed in the above-mentioned patent has improved surface in terms of adhesion strength, it is required to further improve the properties such as durability, chemical resistance, water resistance and salt resistance, There has been a need for improvement in relation to the technique of increasing the causticity and inhibiting microbial propagation.
The present invention is a technique which further improves the technique relating to the coating agent proposed in the existing patent of the present inventor, and complements the portion lacking in the existing patent.
Hereinafter, each component included in the concrete surface protective coating composition according to the present invention will be described in detail.
First, the first liquid phase component is an acrylic resin component as a resin component constituting the polymer.
In the present invention, the resin component constituting the first liquid phase component is 1 to 7 parts by weight of methyl methacrylate, 5 to 20 parts by weight of styrene monomer, 1 to 10 parts by weight of n-butyl acrylate, 0.1 to 10 parts by weight of methyl acrylate, 0.1 to 10 parts by weight of isobornyl acrylate.
The methyl methacrylate (MMA) serves to enhance the viscosity and adhesion of the coating composition for surface protection of concrete structures according to the present invention. It is preferable that the methyl methacrylate is contained in the first liquid component in the range of 1 to 7 parts by weight. When the methyl methacrylate is contained in an amount of less than 1 part by weight, the viscosity is lowered and the adhesion performance to the concrete structure is lowered If the amount of the acrylic resin exceeds 7 parts by weight, the acrylic resin can not be easily mixed with the powder component due to the excessive viscosity. Thus, there is a problem that the dispersibility of the acrylic resin is deteriorated. Also, .
The styrene monomer is polymerized in the form of a polymer by an initiator to promote hardening of the coating composition for surface protection of concrete structures according to the present invention and to increase the strength thereof. When the styrene monomer is contained in an amount of less than 5 parts by weight, the curing speed of the coating composition for protecting a concrete structure may be lowered and the cured If the amount exceeds 20 parts by weight, it is included more than necessary and the economical efficiency is lowered.
The n-butyl acrylate serves to improve the adhesion performance of the coating composition for surface protection of concrete structures according to the present invention. The content of the n-butyl acrylate in the first liquid component is preferably in the range of 1 to 10 parts by weight. When the content of the n-butyl acrylate is less than 1 part by weight, The case is less economical.
The methyl acrylate serves to improve the adhesion performance and strength of the coating composition for surface protection of concrete structures according to the present invention. When the methyl acrylate is contained in an amount of less than 0.1 part by weight, the adhesion performance and the strength characteristics are lowered, and when 10 parts by weight of the methyl acrylate is contained in the first liquid component, If it exceeds, economical efficiency decreases.
The isobornyl acrylate serves to improve the dispersibility of the components contained in the coating composition for surface protection of concrete structures according to the present invention. It is preferable that the isobonyl acrylate is contained in the range of 0.1 to 10 parts by weight based on the first liquid component. If the amount of the isobornyl acrylate is less than 0.1 part by weight, dispersibility of various components decreases, There is a problem that it is difficult to obtain physical properties. When it exceeds 10 parts by weight, there is a problem that the addition amount of other components is limited and it is difficult to obtain strength and adhesion performance.
The present invention includes a second liquid component and a third liquid component separately from the first liquid component constituted as described above.
In the present invention, the second liquid phase component comprises an initiator and an emulsifier.
In the present invention, the initiator serves to initiate polymerization of the acrylic resin component and the styrene monomer contained in the first liquid component. Examples of the initiator include t-butyl peroxybenzoate, benzoyl peroxide, methyl ethyl ketone peroxide Oxime, cumene hydroperoxide, t-butyl acetic tape, or 2,5-dimethylhexyl-2,5-diperoxybenzoate may be used. In the present invention, it is preferable that the initiator is used in the range of 0.05 to 5.0 parts by weight based on the second liquid component. If the content of the initiator is less than 0.05 part by weight, the polymerization initiating reaction of the acrylic resin and the styrene monomer is lowered, And when it exceeds 5.0 parts by weight, there is a problem that it is difficult to control the polymerization reaction efficiently.
In the present invention, when the water is added to the coating composition for protecting the surface of a concrete structure according to the present invention, the emulsifier easily mixes the coating agent with water. As the emulsifier in the present invention, a glycerin fatty acid ester, a sorbitan fatty acid ester, or a polyglycerin fatty acid ester may be used. In the present invention, it is preferable that the emulsifier is used in the range of 0.05 to 5.0 parts by weight based on the second liquid component. If the content of the emulsifier is less than 0.05 part by weight, However, if the amount is more than 5 parts by weight, there is a problem that the strength and adhesion performance are difficult to be exerted.
Also, in the present invention, the third liquid component may contain 0.1 to 5 parts by weight of potassium methylsiliconate, 0.1 to 5 parts by weight of dimethyl ammonium chloride, 0.1 to 10 parts by weight of an epoxy-based binder resin and 0.1 to 10 parts by weight of an inorganic polymer 0.1 To 5 parts by weight.
In the present invention, the potassium methylsiliconate plays a role of penetrating the surface reinforcing component of the coating composition for concrete structure surface protection according to the present invention into the concrete structure and enhancing the water repellency. In the present invention, it is preferable that the potassium methylsiliconate is contained in the range of 0.1 to 3 parts by weight in the third liquid phase component. If the content of potassium methylsiliconate in the third liquid component is less than 0.1 part by weight, the surface strengthening effect and water repellent effect are insignificant, and if it exceeds 3 parts by weight, compatibility may be a problem. In the present invention, it is more preferable that the potassium methylsiliconate has a solid content of 30-40 wt% and a pH of 12-14.
In addition, in the present invention, the dimethyl ammonium chloride is used in the coating composition for surface protection of concrete structures according to the present invention to prevent the various harmful components of concrete from leaking out, thereby preventing environmental pollution. In the present invention, it is preferable that the dimethyl ammonium chloride is contained in the range of 0.1 to 5 parts by weight in the third liquid phase component. If the content of dimethyl ammonium chloride in the third liquid phase component is less than 0.1 part by weight, the effect of preventing the external elution of various harmful components of the concrete is deteriorated. If the amount is more than 5 parts by weight, compatibility may be a problem.
In addition, the epoxy-based binder resin of the present invention improves the bonding strength between the components of the composition and improves the mechanical strength and watertightness of the interior of the concrete.
In the present invention, it is preferable to use the epoxy resin. The content of the epoxy resin is preferably in the range of 0.1 to 10 parts by weight based on the third liquid component.
In addition, in the present invention, the inorganic polymer containing the fluorine (F) group may be added to the coating composition for surface protection of concrete structures according to the present invention, when the surface is exposed to acidic conditions, . In the present invention, the inorganic polymer containing the fluorine (F) group is preferably composed of a mixture of aluminosilicate and fluoroalkali silicate in a weight ratio of 50 to 65: 35 to 50. When the content of the aluminosilicate is less than the above range, there is a problem of strength deterioration. If the content of the aluminosilicate exceeds the above range, cracking may occur due to the surface of the coating.
In the present invention, it is preferable that the inorganic polymer containing the fluorine (F) group is contained in the range of 0.1 to 10 parts by weight in the third liquid component. When the content is less than 0.1 parts by weight, the effect of strengthening acid resistance is insignificant. When the content is more than 10 parts by weight, compatibility may be a problem.
In the present invention, powder components are contained separately from the liquid components. The powder component used in the present invention is composed of a first powder component, a second powder component and a third powder component.
In the present invention, the first powder component comprises 0.5 to 10 parts by weight of clinker, 1 to 10 parts by weight of gypsum (excluding anhydrous gypsum), 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of anhydrous gypsum, 0.1 to 5 parts by weight of silica fume 0.01 to 5 parts by weight of fly ash, 0.5 to 10 parts by weight of limestone, 0.01 to 5 parts by weight of slag, 0.01 to 10 parts by weight of calcined pozzolan and 0.01 to 10 parts by weight of microsilica.
The clinker is composed of calcium silicate, alite, berylite and celite. The clinker serves to promote the mixing of the powder component and the liquid component. If the content of the clinker is less than 0.5 part by weight, mixing of the powder component and the liquid component is not easy, and 10 parts by weight of the clinker is added to the first powder component in an amount of 0.5 to 10 parts by weight. There is a problem that strength is lowered.
The gypsum serves to increase the viscosity and improve the adhesion. It is preferable that the gypsum (except anhydrous gypsum) is contained in the first powder component in the range of 1 to 10 parts by weight. If the content of the gypsum is less than 1 part by weight, If it exceeds 10 parts by weight, there is a problem that the strength is lowered.
The plaster serves to facilitate mixing of the components contained in the powder component with the liquid component. It is preferable that the plaster is included in the first powder component in the range of 0.5 to 10 parts by weight. Therefore, when the content of the plaster is less than 0.5 part by weight, various components contained in the powder component can be easily There is a problem that it is difficult to be mixed, and when it exceeds 10 parts by weight, the strength and chemical resistance are deteriorated.
The anhydrous gypsum is a mineral corresponding to an anhydride of calcium sulfate, and plays a role of improving the adhesion when the powder component and the liquid component are mixed. It is preferable that the anhydrous gypsum is contained in the first powder component in the range of 0.5 to 10 parts by weight. When the content of the gypsum anhydride is less than 0.5 part by weight, the adhesion of the coating agent is deteriorated, There is a problem that the chemical resistance is deteriorated.
The silica fume is an amorphous active silica having an average particle diameter of about 0.15 mu m and is a nearly spherical particle. Silica fume improves the water resistance and chemical resistance by the filling effect between the powder component particles due to the characteristics of the spherical particles and enhances the strength of the coating agent. In particular, silica fume also plays a role in improving the adhesion performance of the coating agent. It is preferable that the silica fume is contained in the first powder component in the range of 0.1 to 5 parts by weight. When the content of the silica fume is less than 0.1 part by weight, the water repellency and chemical resistance of the coating agent are lowered, There is a problem, and when it exceeds 5 parts by weight, cracks may occur.
The fly ash is a coal fly ash produced by burning coal in a coal-fired facility such as a thermal power plant, which remains in oxide form and remains as fine dust of silicon oxide (SiO 2 ) or aluminum oxide (Al 2 O 3 ) . When the fly ash is mixed with a coating agent, workability is improved and long-term strength and water tightness are improved, which is economical. The fly ash is preferably contained in the first powder component in the range of 0.01 to 5 parts by weight. When the content of the fly ash is less than 0.01, the adhesion performance of the coating agent is deteriorated. When the fly ash is more than 5 parts by weight There is a problem that the chemical resistance is lowered.
The limestone plays an auxiliary role in improving the adhesion of the coating composition for surface protection of concrete structures according to the present invention. It is preferable that the limestone is contained in the first powder component in the range of 0.5 to 10 parts by weight. If the content of the limestone is less than 0.5 part by weight, the effect of improving the adhesion of the coating is deteriorated, There is a problem that the chemical resistance is deteriorated.
The slag is a by-product generated in the process of manufacturing steel in a steel mill or the like. The main component of the slag is alumina silicate, and when it is mixed with the powder ingredient, it plays a role of improving the durability and chemical resistance of the coating agent. Particularly, the slag has a low water permeability and serves to improve the water resistance of the coating material according to the present invention. If the content of the slag is less than 0.01 part by weight, durability, chemical resistance, and water resistance of the coating agent are deteriorated. If the content of the slag is less than 0.01 part by weight, If it exceeds 5 parts by weight, cracking of the coating agent may occur and the weight may increase.
The calcined pozzolana is prepared by adding calcium to natural pozzolana, which is composed mainly of fine red, volatile acid earth, and improves the water resistance of the coating material according to the present invention. Specifically, a mixture obtained by mixing 100 parts by weight of natural pazololane with 1 to 20 parts by weight of calcium is calcined at 1000 to 1200 ° C. for 0.5 to 1 hour and pulverized to have an average particle size of 10 to 20 μm. . When applied to the above-mentioned treated low-pozzolana coating agent, it improves the denseness and increases the water resistance and strength. It is preferable that the lower pozzolana is contained in the first powder component in the range of 0.01 to 5 parts by weight. When the content of the lower pozzolana is less than 0.01 part by weight, the water resistance of the coating agent is lowered, There is a problem that strength is lowered.
The micro silica is a silica particle having a particle diameter of 10 to 200 탆 and serves to improve the strength and chemical resistance of the coating material according to the present invention. When the content of the microsilica is less than 0.01 part by weight, the strength and chemical resistance of the coating are deteriorated. If the content of the microsilica exceeds 10 parts by weight There is a problem that adhesion performance is deteriorated.
In the present invention, the second powder component includes 10 to 50 parts by weight of oyster shell powder, 5 to 20 parts by weight of purified water sludge powder, 5 to 20 parts by weight of waste glass powder, and 10 to 40 parts by weight of waste stone powder.
Each of the components constituting the second powder component utilizes the materials to be discarded. The waste materials are preferably pulverized so as to have a particle diameter of 10 to 200 mu m, and the powder (particularly compressive strength) It is further strengthened, economical effect can be obtained, and secondary environmental pollution can be prevented by waste recycling.
In the present invention, the ingredients using the waste materials are mixed with oyster shell powder, purified water sludge powder, waste glass powder and waste rock powder. The content ratio of each ingredient is 10-50 parts by weight of oyster shell powder, 5 parts by weight of purified water sludge powder 5 20 to 20 parts by weight of waste glass powder, 5 to 20 parts by weight of waste glass powder and 10 to 40 parts by weight of waste stone powder.
In the present invention, the third powder component is composed of a super active clay powder having a particle size of 100 to 400 mesh.
The super active clay powder occupies most of the ash content and also contains a small amount of other metal oxides. Especially 500 to 800 ppm of CaO and 300 to 400 ppm of P 2 O 5 .
The super active clay powder preferably has a particle size of 100 to 400 mesh, and when used in the coating composition for surface protection of concrete structures according to the present invention, plays a role of inhibiting bacterial growth.
In the present invention, the respective components (1) to (6) are mixed and used in an appropriate ratio, preferably mixed immediately before use.
Specifically, in the present invention, the first liquid component, the second liquid component, and the third liquid component are mixed at a weight ratio of 50: 95: 5 to 50: 0.1 to 10, and 100 parts by weight of the mixed liquid component 2 to 5 parts by weight of the first powder component, 3 to 8 parts by weight of the second powder component and 0.1 to 5 parts by weight of the third powder component.
The coating composition for surface protection of concrete structures obtained by the above composition is present in a state in which the liquid component and the powder component are separated from each other and is mixed on the concrete surface just before use.
The coating composition may further comprise 0.1 to 10 parts by weight of a dispersing agent, 0.01 to 3 parts by weight of an antifoaming agent and 0.01 to 10 parts by weight of a retarder, if necessary.
Next, a method for protecting the surface of a concrete structure using the coating composition for protecting a concrete structure according to the present invention will be described.
The concrete construction surface protection method according to the present invention
(a) preparing a coating composition for surface protection of concrete structures by mixing each component of the coating composition for surface protection of a concrete structure according to the present invention;
(b) grinding and polishing the surface of the concrete structure to be applied; And
(c) applying and curing the coating composition for surface protection of a concrete structure prepared in the step (a) to the surface to be trimmed;
.
Specifically, the coating composition for surface protection of concrete structures is prepared by mixing each component of the coating composition for surface protection of concrete structures according to the present invention.
Then, the concrete surface of the concrete to be cleaned is cleaned to remove foreign matter, and after the high-pressure spray washing, a concrete repair material (mortar) is filled in the depressed portion or the removed portion to perform the planarization work. If there is an exposed reinforcing bar at this time, it is preferable to treat the reinforcing bar first with an epoxy paint or the like. The modified latex component obtained by mixing latex resin, ultra fast cement, carbon black and fibers at a weight ratio of about 100: 1 to 20: 0.1 to 10: 0.1 to 10 is mixed with the concrete repair material (mortar) (Mortar) obtained by mixing parts by weight of the concrete, the penetration into the concrete can be improved and the adhesion of the repair material can be enhanced.
After the filling operation is completed, the prepared coating composition for a surface protecting concrete structure according to the present invention is applied to the surface of the concrete by using painting, rolling or spraying method, and is cured.
The coating composition for surface protection of concrete structures according to the present invention is excellent in durability, weatherability, surface strength, and waterproofing effect by only one application, but it is preferable to reapply 2 to 3 times in order to exhibit its function optimally. In the present invention, the coating composition for surface protection of concrete structures is applied at 20 to 200 g / m 2 , and the coating thickness is preferably applied at a thickness of 50 to 300 μm before the drying.
The present invention has been described in detail with respect to a coating composition for surface protection of concrete structures and a surface protection method for concrete structures using the same.
The coating composition for surface protection of concrete structures according to the present invention can be used for protecting the surface of concrete structures in various fields and can be used for surface protection of slabs, beams, columns, walls and bottoms, Can be usefully used for piers, columns, rocks, and other offshore structures of underwater structures such as ships, pylons and anti-infiltration of chlorine ions, ship docks and breakwaters, and exhibits high strength and high density characteristics. It can also be used in a treatment plant or the like.
The coating composition for surface protection of concrete structures according to the present invention suppresses permeation of deteriorating substances such as salts and acidic substances, thereby enhancing the durability of concrete structures, and is excellent in compatibility with mortar surfaces.
In addition, the coating composition for surface protection of concrete structures according to the present invention is excellent in adhesion to existing base materials, does not have a neutralization reaction with concrete, has a water resistance, ozone resistance, chemical resistance, water resistance, air permeability, There is an advantage of not occurring.
Also, the coating composition for surface protection of concrete structures according to the present invention is excellent in air permeability, does not cause condensation, does not oxidize the surface of the structure, has excellent permeability, hardens the infiltrated product, It is excellent in waterproof property, particularly, it prevents cracking of the matrix in which shrinkage and expansion are repeated due to temperature change, and is excellent in stretchability and is very suitable for work in a vibration area.
In addition, the coating composition for surface protection of concrete structures according to the present invention has excellent strength, prevents penetration of carbon dioxide, and prevents water penetration. The coating composition for surface protection of concrete structures according to the present invention has a low content of volatile organic compounds (VOC) and is environmentally friendly, has no air pollution, exhibits high strength, has excellent early strength, has fine particles, outstanding.
In addition, the coating composition for surface protection of concrete structures according to the present invention is excellent in water resistance, weather resistance, chemical resistance and stain resistance and can protect the matrix and finish from chemical gas, exhaust gas and rainwater, It has a great effect.
Also, the coating composition for surface protection of concrete structures according to the present invention is excellent in compatibility between a liquid component and a powder component, and is easily compounded, thus facilitating construction and excellent workability. The coating composition for surface protection of concrete structures according to the present invention is excellent in high elasticity, smoothness, low temperature stability (cracking resistance) and odorlessness, exhibits good dispersing action even when mixed with water, and maintains uniform strength and high strength at the same time. In addition, it forms a dense tissue with high density due to the good dispersing action of the powder component, and is excellent in chemical resistance (salt resistance, acid resistance) and inhibits penetration of water, oil and the like.
Also, the coating composition for surface protection of concrete structures according to the present invention is excellent in adhesion to concrete, excellent in both short-term adhesion strength and long-term stability, and has an advantage in that cracks do not occur due to proper balance of strength and stability.
In addition, the coating composition for surface protection of concrete structures according to the present invention is excellent in corrosion resistance against an acidic environment and particularly inhibits the growth of microorganisms, thereby preventing surface degradation and surface contamination due to microorganisms and improving weatherability and surface strength So that the surface protection effect of the concrete structure is excellent and the effect can be maintained for a long time.
Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited by the following examples.
[Example]
Example One
5 parts by weight of methyl methacrylate, 10 parts by weight of styrene monomer, 5 parts by weight of n-butyl acrylate, 5 parts by weight of methyl acrylate and 5 parts by weight of isobornyl acrylate were mixed to prepare a first liquid component, 3 parts by weight of oxybenzoate and 4 parts by weight of glycerin fatty acid ester were mixed to prepare a second liquid component. Then, 1 part by weight of potassium methylsiliconate, 2 parts by weight of dimethyl ammonium chloride, 5 parts by weight of epoxy binder resin, Was mixed with 1 part by weight of an inorganic polymer (mixture of aluminosilicate and fluoroalkali silicate in a weight ratio of 60:40) to prepare a third liquid component.
Then, 5 parts by weight of clinker, 5 parts by weight of gypsum (excluding anhydrous gypsum), 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume, 3 parts by weight of fly ash, 7 parts by weight of limestone, 7 parts by weight of calcined pozzolana and 3 parts by weight of microsilica were mixed to prepare a first powder component, and 20 parts by weight of oyster shell powder, 10 parts by weight of purified sludge powder, 10 parts by weight of waste glass powder, The second powder component was prepared, and about 100 to 400 mesh super active clay powder (containing 500 to 800 ppm CaO and 300-400 ppm P 2 O 5 ) was prepared as a third powder component.
Then, the prepared first liquid component and the second liquid component were mixed at a weight ratio of 90: 10: 2 to prepare a liquid component. Then, based on 100 parts by weight of the liquid component, 4 parts by weight of the first powder component, 7 parts by weight of the second powder component and 2 parts by weight of the third powder component were mixed to prepare a coating composition.
Comparative Example 1
5 parts by weight of methyl methacrylate, 10 parts by weight of styrene monomer, 5 parts by weight of n-butyl acrylate, 5 parts by weight of methyl acrylate and 5 parts by weight of isobornyl acrylate were mixed to prepare a first liquid component, 3 parts by weight of oxybenzoate and 4 parts by weight of glycerin fatty acid ester were mixed to prepare a second liquid component. Then, 5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume , 3 parts by weight of fly ash, 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolanas and 3 parts by weight of microsilica were mixed to prepare a first powder component. 20 parts by weight of oyster shell powder, 10 parts by weight of purified water sludge powder 10 , 10 parts by weight of waste glass powder and 30 parts by weight of waste stone powder were mixed to prepare a second powder component.
Then, the first liquid component and the second liquid component were mixed at a weight ratio of 90:10 to prepare a liquid component. Then, based on 100 parts by weight of the liquid component prepared, 4 parts by weight of the first powder component, And 7 parts by weight of the powder component were mixed to prepare a coating agent.
Comparative Example 2
5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume, and 3 parts by weight of fly ash 3 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolan, and 3 parts by weight of microsilica were mixed to prepare a coating agent.
Comparative Example 3
5 parts by weight of styrene monomer, 5 parts by weight of t-butyl peroxybenzoate and 5 parts by weight of glycerin fatty acid ester were mixed, and 5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of fume, 3 parts by weight of fly ash, 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolan and 3 parts by weight of microsilica.
Comparative Example 4
30 parts by weight of n-butyl acrylate and 5 parts by weight of glycerin fatty acid ester were mixed, and 5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume, 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolan, and 3 parts by weight of microsilica were mixed to prepare a coating agent.
Performance evaluation
1. Bending strength, compressive strength, tensile strength, bond strength and volume change rate test
The flexural strength, compressive strength, tensile strength, volume change rate, and adhesion strength of the coating composition for surface protection of concrete structures prepared according to Example 1 and Comparative Examples 1 to 4 were measured.
The flexural strength, compressive strength, tensile strength and adhesion strength were measured according to the standard of KS F 4042-02 after 28 days of application of the coating agent. The volume change rate was the temperature of the coating agent after 28 days from 0 ° C to 35 ° C The results are shown in Table 1 below.
(N / mm < 2 &
(N / mm < 2 &
(N / mm < 2 &
(MPa)
(%)
Referring to Table 1, the coating composition for surface protection of concrete structures according to the present invention shows that the coating composition of the present invention is equivalent or superior in strength and adhesion performance as compared with conventional coatings.
2. Waterproof and chemical resistance test
Example 1 The waterproofing and chemical resistance of the coating compositions for surface protection of concrete structures prepared according to Comparative Examples 1 to 4 were measured.
The waterproof property was evaluated by coating the concrete structure surface protective coating composition on the concrete structure to a thickness of 1 cm, and installing a cylindrical water tank on the concrete structure to check the permeation of water for 6 months.
The chemical resistance was evaluated by treating the coating layer with a salt concentration of 35 ‰ and a sulfuric acid solution having a concentration of 2% on the concrete structure for 28 hours after the curing on the concrete structure for 1 hour every day for 60 days Respectively.
The results are shown in Table 2 below.
(month)
As shown in Table 2, in the case of Example 1 and Comparative Example 1, moisture was not penetrated at all for 6 months, while in Comparative Examples 2 to 4, water was penetrated after 1 to 2 months. This is interpreted as a result of exhibiting excellent waterproof performance of the coating composition for surface protection of concrete structures according to the present invention.
In Table 2, in the case of Example 1 and Comparative Example 1, surface damage was not caused at all by the brine treated for 60 days. In Comparative Examples 2 to 4, surface damage Can be seen. When the sulfuric acid solution was treated, it was confirmed that the surface damage was not occurred in the case of Example 1, but the acid resistance of the sulfuric acid solution in Comparative Example 1 was lower than that in Example 1, In the case of 2 to 4, it can be confirmed that surface damage has occurred within 5 to 15 days.
This is interpreted as a result of supporting that the coating composition for surface protection of concrete structures according to the present invention has excellent chemical resistance and especially acid resistance.
3. Oxygen permeability, weather resistance, stain resistance
Example 1 The oxygen permeability, weatherability and stain resistance of the coating composition for surface protection of concrete structures prepared according to Comparative Examples 1 to 4 were measured.
The oxygen permeability was evaluated according to the gas permeability test method of KS A 1027.
The weatherability was evaluated according to the accelerated weathering test method of KS M 5000-3231.
The stain resistance was evaluated by spraying the carbon black dispersed in water and solvent (mineral spirits) at 20% in the specimen, immersing it at 80 ± 2 ° C for 5 hours and drying, then washing the water with flowing water, The water-washability was evaluated by observing the remaining state with naked eyes.
The results are shown in Table 3 below.
(ΔE)
As shown in Table 3, the results of Example 1 and Comparative Example 1 are excellent in weatherability and stain resistance, but the results of Example 1 were better in the evaluation of oxygen permeability. On the other hand, in the case of Comparative Examples 1 to 4, both of weather resistance, stain resistance and oxygen permeability were inferior to those of Example 1. Therefore, when the coating composition according to the present invention is used, it can be confirmed that both of the oxygen barrier property, weather resistance and stain resistance are superior to those of conventional coating agents.
Claims (6)
(1) 1 to 7 parts by weight of methyl methacrylate, 5 to 20 parts by weight of styrene monomer, 1 to 10 parts by weight of n-butyl acrylate, 0.1 to 10 parts by weight of methyl acrylate and 0.1 to 10 parts by weight of isobornyl acrylate A first liquid phase component;
(2) 0.05 to 5 parts by weight of an initiator and 0.05 to 5 parts by weight of an emulsifier;
(3) a third component comprising 0.1 to 5 parts by weight of potassium methylsiliconate, 0.1 to 5 parts by weight of dimethyl ammonium chloride, 0.1 to 10 parts by weight of an epoxy-based binder resin and 0.1 to 5 parts by weight of an inorganic polymer containing a fluorine (F) Liquid component;
(4) 0.5 to 10 parts by weight of clinker, 1 to 10 parts by weight of gypsum (excluding anhydrous gypsum), 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of anhydrous gypsum, 0.1 to 5 parts by weight of silica fume, 5 to 10 parts by weight of limestone, 0.01 to 5 parts by weight of slag, 0.01 to 10 parts by weight of a calcined pozzolan and 0.01 to 10 parts by weight of microsilica;
(5) a second powder component comprising 10 to 50 parts by weight of oyster shell powder, 5 to 20 parts by weight of purified water sludge powder, 5 to 20 parts by weight of waste glass powder and 10 to 40 parts by weight of waste stone powder;
(6) a third powder component consisting of a super active clay powder having a particle size of 100 to 400 mesh, wherein the first liquid component, the second liquid component and the third liquid component are mixed in a ratio of 50 to 95: To 50: 0.1 to 10 parts by weight based on 100 parts by weight of the mixed liquid component, 2 to 5 parts by weight of the first powder component, 3 to 8 parts by weight of the second powder component and 0.1 to 5 parts by weight of the third powder component, 5 parts by weight,
The potassium methylsiliconate of the above (3) has a solid content of 30 to 40% by weight and a pH of 12 to 14, a mixture of 100 parts by weight of the lower pozzolana of the above (4) and 1 to 20 parts by weight of calcium a second activated clay powder of a will, a 6 pulverized so that a mean particle size of 10 ~ 20 ㎛ after calcination for 0.5 to 1 hour at 1000 ~ 1200 ℃ is CaO 500 ~ 800 ppm, P 2 O 5 300 ~ 400 by weight based on the total weight of the coating composition.
(b) grinding and polishing the surface of the concrete structure to be applied; And
(c) applying and curing the coating composition for surface protection of a concrete structure prepared in the step (a) to the surface to be trimmed;
And,
The method of claim 1, wherein the concrete repair material comprises latex resin, ultra-rapid cement, carbon black, and fibers at a ratio of 100: 1 to 20: 0.1: 10 to 0.1 to 10 parts by weight of a modified latex component is mixed with 0.1 to 5 parts by weight of acetic acid to prepare a concrete repair material. After the filling of the concrete repair material is completed, Wherein the coating composition for surface protection of a concrete structure is applied to the surface of a workpiece by painting, rolling or spraying and then cured.
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| KR101941179B1 (en) * | 2018-05-14 | 2019-01-22 | 주식회사 유버스 | Composition for repairing and reinforcing concrete structure comprising high strength mortar, and method of repairing and reinforcing concrete structures using the same |
| KR101934694B1 (en) | 2018-04-06 | 2019-03-18 | (주)리뉴시스템 | Coating composition for surface protection of concrete structure with excellent weather resistance and strain resistance containing silicone modified hybrid ceramic resin and, Method for waterproof and anti-corrosion of concrete structure using the same |
| KR20200127566A (en) | 2019-05-03 | 2020-11-11 | 주식회사 삼명이엔씨 | Repair method of concrete structure using high durable mortar and anti-corrosion primer containing ion exchange resin and anion fixing inhibitor component |
| KR102281520B1 (en) * | 2021-01-08 | 2021-07-26 | 강상수 | Concrete structure surface protective material with excellent adhesion and durability, and concrete structure surface protection method using the same |
| KR102450188B1 (en) * | 2021-12-30 | 2022-10-05 | 세운산업 주식회사 | Valve chamber with anti-condensation and stagnant prevention function |
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