KR20130011560A - Rapid setting concrete compound containing hydrophobic emulsion and repairing method of concrete structure using the compound - Google Patents
Rapid setting concrete compound containing hydrophobic emulsion and repairing method of concrete structure using the compound Download PDFInfo
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- KR20130011560A KR20130011560A KR1020110072794A KR20110072794A KR20130011560A KR 20130011560 A KR20130011560 A KR 20130011560A KR 1020110072794 A KR1020110072794 A KR 1020110072794A KR 20110072794 A KR20110072794 A KR 20110072794A KR 20130011560 A KR20130011560 A KR 20130011560A
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
- C04B22/142—Sulfates
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical Kinetics & Catalysis (AREA)
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- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
The present invention relates to a cemented carbide concrete composition and a method for repairing concrete structures using the same, and more particularly, by mixing a polymer admixture, workability and water resistance are improved, and mechanical properties such as bending strength, tensile strength and adhesion strength are improved. In addition, the present invention relates to a repairing polymer-incorporated cemented carbide concrete composition which can reduce the particle size of the mixed polymer admixture, and exhibit sufficient performance with a small amount of latex, and a repair method of the concrete structure using the same.
In general, concrete pavement is rigid and has high construction constraints due to temperature and working environment and takes a long time to cure, and has disadvantages such as cracking caused by dry shrinkage, unfavorable riding comfort and comfort, but excellent durability and maintenance cost. It is a reality that is applied to highways and vehicle roads due to the advantages of savings.
By the way, the concrete slab of the bridge, the road surface of the bridge, the cracks in the concrete due to deterioration in the lower part of the bridge, etc. After the seal is passed, the compressive strength of the concrete and the tensile strength of the reinforcing steel gradually decreases, The exposed concrete is neutralized and corrosion of the rebar occurs. If the corrosion of the reinforcing bar becomes more severe, the concrete structure may eventually collapse. Therefore, when the concrete structure deteriorates and cracks occur, it is necessary to repair the deteriorated portion promptly.
In recent urgent repair work, cemented carbide latex modified concrete containing latex resin is added to cemented cement, but the cemented latex modified concrete containing latex resin is not only poor in workability but also has problems in construction and temperature. Due to the delay of the hydration reaction has a problem that the initial strength is lowered.
The problem to be solved by the present invention is that the polymer admixture is mixed to improve the workability and water resistance, the mechanical properties such as bending strength, tensile strength and adhesion strength is improved, and the particle size of the mixed polymer admixture is reduced compared to the conventional latex, so The present invention provides a repairing polymer-incorporated cemented carbide concrete composition capable of exhibiting sufficient performance and a repairing method of a concrete structure using the same.
The present invention includes 3 to 27 parts by weight of cement-based binder, 29 to 62 parts by weight of fine aggregate, 20 to 55 parts by weight of coarse aggregate, 0.5 to 8 parts by weight of water and 0.1 to 8 parts by weight of polymer admixture, wherein the polymer admixture is a hydrophobic acrylic emulsion. Repair polymer comprising 75 to 99 parts by weight, polyvinylacetate ethylene latex 0.1 to 10 parts by weight, 0.1 to 10 parts by weight of polystyrene acrylic ester latex, 0.01 to 5 parts by weight of methacrylamide monomer and 0.01 to 5 parts by weight of reaction initiator Provided is a cemented carbide concrete composition.
The cement-based binder may include 40 to 85 parts by weight of crude steel cement, 5 to 30 parts by weight of calcium alumina cement, 5 to 20 parts by weight of blast furnace slag, 0.1 to 10 parts by weight of zeolite and 0.01 to 3 parts by weight of water glass powder.
Sodiumpersulphate is preferably used as a reaction initiator of the polymer admixture.
The repairing polymer mixed cemented carbide concrete composition may be made to further comprise 0.01 to 5 parts by weight of fiber reinforcement.
The fiber reinforcing material may be made of nylon fibers and polyvinyl alcohol fibers are mixed in a weight ratio of 80 ~ 99.9: 0.01 ~ 20.
The repairing polymer-incorporated cemented carbide concrete composition may further comprise 0.001 to 2.5 parts by weight of a water reducing agent.
In addition, the present invention is a step of chipping (Chipping) to remove the deteriorated or impurity site of the concrete structure, applying or blooming the primer on the chipped site, the primer coating site or blooming process site 3 to 27 parts by weight of cement binder, 29 to 62 parts by weight of fine aggregate, 20 to 55 parts by weight of coarse aggregate, 0.5 to 8 parts by weight of water and 0.1 to 8 parts by weight of polymer admixture, wherein the polymer admixture is hydrophobic acrylic emulsion 75 to 99 Repairing polymer incorporation superhard diameter including 0.1 parts by weight of polyvinylacetate ethylene latex, 0.1-10 parts by weight of polystyrene acrylic ester latex, 0.01-5 parts by weight of methacrylamide monomer and 0.01-5 parts by weight of reaction initiator Applying and molding the concrete composition and the applied repairing polymer-incorporated cemented carbide concrete There is provided a repair method for a concrete structure using a repairing polymer-incorporated cemented carbide concrete composition comprising curing the composition.
The primer used in the step of applying or blooming the primer is made of styrene butadiene rubber (SBR) latex, acrylic, polyacryl ester (PAE) and ethylene vinyl acetate (EVA) At least one primer selected from the group.
According to the present invention, workability and water resistance are improved, mechanical properties such as flexural strength, tensile strength and adhesion strength are improved, and sufficient performance can be exhibited with a small amount of use. Provide repair methods for structures.
Hereinafter, preferred embodiments of the present invention will be described in detail. However, the following embodiments are provided to those skilled in the art to fully understand the present invention, and may be modified in various forms, and the scope of the present invention is limited to the embodiments described below. It doesn't happen.
Hereinafter, the repairing polymer-incorporated cemented carbide concrete composition of the present invention will be described in detail.
The repair polymer mixed cemented carbide concrete composition of the present invention includes 3 to 27 parts by weight of cement binder, 29 to 62 parts by weight of fine aggregate, 20 to 55 parts by weight of coarse aggregate, 0.5 to 8 parts by weight of water, and 0.1 to 8 parts by weight of polymer admixture. The polymer admixture may include 75 to 99 parts by weight of hydrophobic acrylic emulsion, 0.1 to 10 parts by weight of polyvinylacetate ethylene latex, 0.1 to 10 parts by weight of polystyrene acrylic ester latex, 0.01 to 5 parts by weight of methacrylamide monomer, and 0.01 to reaction initiator. It consists of 5 parts by weight.
First, the cement-based binder contained in the repairing polymer-blended cemented carbide concrete composition of the present invention will be described.
Repairing polymer mixed cemented carbide concrete composition contains 3 to 27 parts by weight of cement-based binder, the cement-based binder is 40 to 85 parts by weight of crude steel cement, 5 to 30 parts by weight of calcium alumina cement, 5 to 20 parts by weight of blast furnace slag, zeolite 0.1 10 parts by weight and 0.01 to 3 parts by weight of the water glass powder may be included.
In the present invention, the crude steel cement included in the cement-based binder of the repairing polymer-blended cemented carbide concrete composition uses a general portland cement according to the KS standard, and the crude steel cement is preferably contained in the cement-based binder in an amount of 40 to 85 parts by weight. If the content of the crude steel cement contained in the cement-based binder is less than 40 parts by weight, the bonding strength of the cement-based binder is lowered. If the content of the crude steel cement contained in the cement-based binder exceeds 85 parts by weight, the repair polymer mixing slurry containing the cement-based binder is included The hard concrete composition tends to be brittle.
In the present invention, calcium alumina cement included in the cement-based binder of the repairing polymer-incorporated cemented carbide concrete composition induces the expression of super-hardness and annealing rigidity in the repairing polymer-incorporated cemented carbide concrete composition and simultaneously produces the acetrite hydrate of acicular crystals. In addition, the ettringite hydrate has a property of reducing dry shrinkage by densifying the structure of the repairing polymer-incorporated cemented carbide concrete composition. Such calcium alumina cement is preferably contained 5 to 30 parts by weight in the cement-based binder. When the content of calcium alumina cement contained in the cement binder is less than 5 parts by weight, the repair polymer-incorporated cemented carbide concrete composition including the cement binder is not properly expressed in super-hardness and annealing rigidity and does not sufficiently produce ethringite hydrate. When the content of calcium alumina cement contained in the cement-based binder exceeds 30 parts by weight, the repair polymer-containing cemented carbide concrete composition including the cement-based binder is easily brittle.
In the present invention, in order to increase the long-term strength expression and durability of the repair polymer mixed cemented carbide concrete composition, the blast furnace slag is included to form a cement-based binder. Such blast furnace slag is preferably contained 5 to 20 parts by weight in the cement-based binder. If the content of blast furnace slag contained in the cement-based binder is less than 5 parts by weight, the long-term strength expression and durability increase of the repair polymer-containing cemented carbide concrete composition including the cement-based binder are low, and the content of the blast furnace slag contained in the cement-based binder is When it exceeds 20 parts by weight, the initial strength of the repair polymer-incorporated cemented carbide concrete composition including the cement-based binder may be lowered.
In the present invention, in order to reduce the heat of hydration and to improve the heat resistance of the repair polymer-incorporated cemented carbide concrete composition, a cement-based binder is formed. It is preferable that such zeolite is contained in an amount of 0.1 to 10 parts by weight in the cement binder. If the amount of zeolite contained in the cement-based binder is less than 0.1 part by weight, the heat of hydration is greatly generated in the repair polymer-incorporated cemented carbide concrete composition including the cement-based binder, while the heat resistance is decreased, and the content of the zeolite in the cement-based binder is 10 When the weight part is more than the weight part, the heat of hydration generated in the repair polymer-incorporated cemented carbide concrete composition including the cement-based binder may be too small, resulting in weak initial strength.
In the present invention, the cement-based binder is formed by including the water glass powder to induce the initial strength of the polymer composition for repair superhard cementitious concrete composition. Such water glass powder is preferably contained in 0.01 to 3 parts by weight of the cement binder. When the content of the water glass powder contained in the cement-based binder is less than 0.01 part by weight, the initial strength of the repair polymer-incorporated cemented carbide concrete composition including the cement-based binder may be lowered and the curing speed may be lowered. When the content is more than 3 parts by weight, the curing rate of the repairing polymer-incorporated cemented carbide concrete composition including the cement-based binder may be excessively high, thereby reducing workability.
In the present invention, there is provided a repairing polymer-incorporated cemented carbide concrete composition containing 3 to 27 parts by weight of cement-based binder having a composition as described above. When the content of the cement-based binder contained in the repair polymer-contained cemented carbide concrete composition is less than 3 parts by weight, the strength of the repair-contained polymer-incorporated cemented carbide concrete composition including the cement-based binder may be lowered. When the content of the cement-based binder contained in the composition exceeds 27 parts by weight, the weight reduction effect of the repairing polymer-incorporated cemented carbide concrete composition including the cement-based binder may be reduced.
Moreover, the polymer admixture contained in the repairing polymer mixing superhard mirror concrete composition of this invention is demonstrated.
The repairing polymer-incorporated cemented carbide concrete composition of the present invention is a polymer admixture is mixed to improve the mechanical properties and durability, such as bending strength, tensile strength, adhesion strength, as well as improve workability by ensuring sufficient pot life of concrete, The polymer admixture may include 75 to 99 parts by weight of hydrophobic acrylic emulsion, 0.1 to 10 parts by weight of polyvinylacetate ethylene latex, 0.1 to 10 parts by weight of polystyrene acrylic ester latex, 0.01 to 5 parts by weight of methacrylamide monomer, and 0.01 to 5 parts by weight of reaction initiator. An addition is made.
In the present invention, the hydrophobic acrylic emulsion included in the polymer admixture of the repair polymer-incorporated cemented carbide concrete composition promotes the mixing of other components of the polymer admixture, and the curing time, workability, It provides the effect of improving strength and durability. Such hydrophobic acrylic emulsion is preferably contained 75 to 99 parts by weight in the polymer admixture. When the content of the hydrophobic acrylic emulsion contained in the polymer admixture is less than 75 parts by weight, the other components of the polymer admixture are not properly mixed, and when the content of the hydrophobic acrylic emulsion contained in the polymer admixture exceeds 99 parts by weight, the polymer admixture is included. The workability of the repairing polymer-incorporated cemented carbide concrete composition may be lowered.
In the present invention, polyvinylacetate ethylene latex included in the polymer admixture of the repair polymer-incorporated cemented carbide concrete composition provides an effect of improving the viscosity and adhesion strength of the repair polymer-incorporated cemented carbide concrete composition. The polyvinylacetate ethylene latex is preferably contained in an amount of 0.1 to 10 parts by weight in the polymer admixture. When the content of polyvinylacetate ethylene latex contained in the polymer admixture is less than 0.1 part by weight, the surface finish and adhesion strength of the repairing polymer-incorporated cemented carbide concrete composition including the polymer admixture are lowered, and the polyvinylacetate contained in the polymer admixture When the content of ethylene latex exceeds 10 parts by weight, the viscosity of the repairing polymer-incorporated cemented carbide concrete composition including the polymer admixture may be lowered, thereby reducing workability.
In the present invention, the polystyrene acrylic ester latex included in the polymer admixture of the repair polymer-incorporated cemented carbide concrete composition provides an effect of improving the bending strength and the tensile strength of the repair polymer-incorporated cemented carbide concrete composition. It is preferable that such polystyrene acrylic ester latex is contained 0.1-10 weight part with a polymer admixture. When the content of the polystyrene acrylic ester latex contained in the polymer admixture is less than 0.1 part by weight, the bending strength and the tensile strength of the repairing polymer-incorporated cemented carbide concrete composition including the polymer admixture do not improve, and the polystyrene acrylic ester latex contained in the polymer admixture When the content of more than 10 parts by weight may delay the hydration reaction of the repairing polymer incorporation cemented carbide concrete composition containing the polymer admixture may interfere with early strength expression.
The methacrylamide monomer included in the polymer admixture of the repairing polymer-incorporated cemented carbide concrete composition in the present invention provides an effect of improving the heat resistance and deformation resistance of the repairing polymer-incorporated cemented carbide concrete composition. It is preferable that such methacrylamide monomer is contained 0.1-5 weight part with a polymer admixture. When the content of the methacrylamide monomer contained in the polymer admixture is less than 0.01 part by weight, the heat resistance and deformation resistance of the repairing polymer-incorporated cemented carbide concrete composition including the polymer admixture are not improved, and the methacrylamide monomer contained in the polymer admixture is not improved. When the content of more than 5 parts by weight, the viscosity of the repairing polymer incorporating cemented carbide concrete composition including the polymer admixture is lowered, the components can be easily separated.
In order to promote the reaction of the repairing polymer-incorporated cemented carbide concrete composition in the present invention, a reaction initiator such as sodium persulfate (Sodiumpersulphate) may be included to make the repairing polymer-incorporated cemented carbide concrete composition. It is preferable that such a reaction initiator is contained 0.01-5 weight part in a polymer admixture. When the content of the reaction initiator contained in the polymer admixture is less than 0.01 parts by weight, the reactivity of the polymer admixture may be lowered. When the content of the reaction initiator contained in the polymer admixture exceeds 5 parts by weight, the reactivity of the polymer admixture becomes excessively large. This may lead to a decrease in workability of the repairing polymer incorporating cemented carbide concrete composition comprising the polymer admixture.
In the present invention, there is provided a repairing polymer-incorporated cemented carbide concrete composition containing 0.1 to 8 parts by weight of a polymer admixture having a composition as described above.
When the content of the polymer admixture contained in the repaired polymer blended cemented carbide concrete composition is less than 0.1 part by weight, the pot life of the repaired polymer blended cemented carbide concrete composition including the polymer admixture is insufficient and the bending strength, tensile strength, adhesion strength, etc. When the mechanical properties and durability are lowered, and the content of the polymer admixture contained in the repairing polymer mixed cemented carbide concrete composition is more than 8 parts by weight, the viscosity of the repairing polymer blended cemented carbide concrete composition including the polymer admixture becomes too high, resulting in workability. Lower slump, delay hydration, delay early strength, and lower price competitiveness.
In the present invention, the aggregate contained in the repairing polymer-blended cemented carbide concrete composition is preferably used by mixing a coarse aggregate having a particle diameter of 5 mm or less and a coarse aggregate having a particle size of 5 mm or more. Hereinafter, fine aggregate is used to mean aggregates having a particle diameter of 5 mm or less, and coarse aggregate is used as meaning aggregates having a particle size of more than 5 mm. When the mixed aggregate and coarse aggregate of the above specifications are used, it is possible to reduce the content of the polymer admixture included in the repairing polymer mixing cemented carbide concrete composition, as well as the workability of the repairing polymer mixing cemented carbide concrete composition. This improves the strength while providing an effect.
Therefore, in this invention, it is preferable that 29-62 weight part of fine aggregates of 5 mm or less of particle diameters, and 20-55 weight part of coarse aggregates exceeding 5 mm of particle diameters are contained. Polymer admixture in repairing polymer mixed cemented carbide concrete composition comprising the fine aggregate and coarse aggregate when the content of fine aggregate is less than 29 parts by weight or the coarse aggregate is less than 20 parts by weight The content of the coarse aggregate increases relatively, and the production cost increases, and when the content of fine aggregate contained in the repair polymer mixed cemented carbide concrete composition exceeds 62 parts by weight or the content of coarse aggregate exceeds 55 parts by weight, the fine aggregate and coarse aggregate are added. The workability and watertightness of the repairing polymer-incorporating cemented carbide concrete composition may be reduced.
And, as described above, 0.5 to 8 parts by weight of water is included to promote the mixing of cement-based binders, polymer admixtures, fine aggregates, and coarse aggregates.
In addition, the repair polymer-incorporated cemented carbide concrete composition of the present invention may be made to further comprise 0.01 to 5 parts by weight of fiber reinforcement.
Repairing polymer-incorporated cemented carbide concrete composition may be provided to further include 0.01 to 5 parts by weight of fiber reinforcement to reduce shrinkage and cracking of the composition and improve water tightness and strength.
In the present invention, 0.5 to 8 parts by weight of water is included to promote the mixing of cement-based binders, polymer admixtures, fine aggregates, and coarse aggregates, so that a polymer mixed superhard concrete composition for repair is made, and thus, nylon fibers and polyvinyl alcohol fibers having excellent affinity with water. It is reasonable to reinforce the repairing polymer-incorporated cemented carbide concrete composition using hydrophilic fibers such as the like.
Accordingly, the fiber reinforcing material contained in the repairing polymer mixed cemented carbide concrete composition uses a fiber reinforcing material in which nylon fibers and polyvinyl alcohol fibers are mixed in a weight ratio of 80 to 99.9: 0.01 to 20. When the content of polyvinyl alcohol fiber mixed with 80 to 99.9 parts by weight of nylon fibers to form a fiber reinforcement is less than 0.01 parts by weight, plastic cracking may occur in the repairing polymer-incorporated cemented carbide concrete composition including the fiber reinforcement. When the content of the polyvinyl alcohol fiber mixed with 80 to 99.9 parts by weight of nylon fibers to form a reinforcing material exceeds 20 parts by weight, the strength of the repairing polymer-incorporated cemented carbide concrete composition including the fiber reinforcing material may be lowered.
It is preferable that 0.01-5 weight part of fiber reinforcement materials of the above components are further contained in the polymer mixing superhard diameter concrete composition for repair. When the content of the polymer admixture included in the repairing polymer-incorporated cemented carbide concrete composition is less than 0.01 part by weight, the effect of preventing shrinkage and improving watertightness and strength of the repairing polymer-incorporated cemented carbide concrete composition including the fiber reinforcement is weak. When the content of the polymer admixture included in the repairing polymer-incorporated cemented carbide concrete composition exceeds 5 parts by weight, the workability of the repairing polymer-incorporated cemented carbide concrete composition including the fiber reinforcing material may be deteriorated.
In addition to this, the repairing polymer-incorporated cemented carbide concrete composition of the present invention may further comprise 0.001 to 2.5 parts by weight of a water reducing agent.
In order to improve the initial workability by reducing the water: cement ratio of the repair polymer-incorporated cemented carbide concrete composition to improve strength and durability, and to delay the hydration reaction of the repairing polymer-incorporated cemented carbide concrete composition, Repairing polymer-incorporated cemented carbide concrete composition may be provided that is made of 0.001 to 2.5 parts by weight of a water reducing agent, such as the main acid.
That is, it is preferable that 0.001-2.5 weight part of water reducing agents, such as a polycarboxylic acid, are further contained in the repairing polymer mixing superhard mirror concrete composition. When the content of the water-reducing agent contained in the repairing polymer-incorporated cemented carbide concrete composition is less than 0.001 part by weight, the strength and durability improvement effects of the repairing-polymer-incorporated cemented carbide concrete composition and the hydration reaction are insignificant. When the content of the water reducing agent contained in the hard concrete composition exceeds 2.5 parts by weight, the water: cement ratio of the repairing polymer-blended superhard concrete composition is excessively reduced, resulting in deterioration of workability.
The repairing polymer-incorporated cemented carbide concrete composition of the above-mentioned components and composition ratio has improved workability and water resistance, and in particular, the particle size of the polymer admixture mixed in the repairing polymer-incorporated cemented carbide concrete composition is reduced compared to conventional latex. It is possible to achieve sufficient performance by usage.
In addition, the repaired site using the repair polymer mixed cemented carbide concrete composition in the concrete structure has a significant improvement in mechanical properties such as bending strength, tensile strength and adhesion strength significantly improve the durability.
With reference to the embodiment will be described in detail for the repair method of the concrete structure using the repairing polymer mixed cemented carbide concrete composition of the present invention. Hereinafter, the concrete structure is used as a meaning including a bridge made of concrete, a road surface, a concrete slab of a bridge, a concrete block, various buildings, and the like.
First, the repairing method of a concrete structure using the repairing polymer-incorporated cemented carbide concrete composition of the present invention includes a first step of chipping and removing a deteriorated portion or an impurity portion of the concrete structure.
Deteriorated parts due to aging or poor construction, impurities such as leitans occurs in the concrete structure, and the deteriorated parts or impurity sites of the concrete structure by chipping (chipping) process by a crusher or water jet It is to remove the deteriorated or impurity sites.
In addition, the repair method of the concrete structure using the repairing polymer-incorporated cemented carbide concrete composition of the present invention includes a second step of applying or blooming the primer to the chipped portion.
In order to repair the concrete structure, when the repairing polymer-incorporated cemented carbide concrete composition is applied directly to the chipped or blooming process in the first step, the applied repairing polymer-incorporated cemented carbide concrete composition is chipped. Problems arise that are easily separated from the damaged or bloomed areas.
In order to solve this problem, in the present invention, the flexibility is excellent, can be exactly matched to the chipped portion of the concrete structure, and excellent adhesion to the chipped portion to apply a primer having a property that can easily adhere to the mortar Or, blooming process is performed to the chipped part. Primers applied to the chipped areas of concrete structures are made of styrene butadiene rubber (SBR) latex, acrylic, polyacryl ester (PAE) and ethylene vinyl acetate (EVA) with excellent flexibility and adhesion. Compounds may be used alone or in combination of two or more compounds.
In addition, the repair method of the concrete structure using the repairing polymer mixed cemented carbide concrete composition of the present invention includes applying a repairing polymer blended cemented carbide concrete composition to the primer coating site or the blooming treatment site.
Specifically, 3 to 27 parts by weight of cement-based binder, 29 to 62 parts by weight of fine aggregate, 20 to 55 parts by weight of coarse aggregate, 0.5 to 8 parts by weight of water, and 0.1 to 8 parts by weight of polymer admixture on the primer coating part or blooming part of the concrete structure The polymer admixture may be included in an amount of 75 to 99 parts by weight of hydrophobic acrylic emulsion, 0.1 to 10 parts by weight of polyvinylacetate ethylene latex, 0.1 to 10 parts by weight of polystyrene acrylic ester latex, 0.01 to 5 parts by weight of methacrylamide monomer and a reaction initiator. 0.01 to 5 parts by weight, preferably the cement-based binder is 40 to 85 parts by weight of crude steel cement, 5 to 30 parts by weight of calcium alumina cement, 5 to 20 parts by weight of blast furnace slag, 0.1 to 10 parts by weight of zeolite and water glass powder Concrete is applied by applying the polymer admixture composition for concrete surface reinforcement and protection which contains 0.01-3 weight part. And forming a structure in the original image.
Since the polymer admixture composition for concrete surface reinforcement and protection of the present invention applied to the primer coating site or the blooming treatment site of the concrete structure as described above does not form deformation due to the inherent viscosity and surface tension, the concrete structure is originally formed. Can be recovered.
In addition, the repair method of the concrete structure using the repairing polymer-incorporated cemented carbide concrete composition of the present invention includes curing the applied repairing polymer-incorporated cemented carbide concrete composition.
The repair of the concrete structure is completed by curing and drying and fixing the method by applying a curing agent to the repairing polymer-incorporated cemented carbide concrete composition restored to the original form of the concrete structure as described above, or by performing a curing of the foil.
Hereinafter, the embodiments of the repairing polymer-incorporated cemented carbide concrete composition according to the present invention will be described in more detail, and the present invention is not limited to the following examples.
≪ Example 1 >
1. 65 parts by weight of crude steel cement, 25 parts by weight of calcium alumina cement, 6 parts by weight of blast furnace slag, 3 parts by weight of zeolite and 1 part by weight of water glass powder, while stirring to form a cement binder, 95 parts by weight of hydrophobic acrylic emulsion, polyvinylacetate 2 parts by weight of ethylene latex, 2 parts by weight of polystyrene acrylic ester latex, 0.5 parts by weight of methacrylamide monomer and 0.5 parts by weight of sodiumpersulphate as a reaction initiator were mixed and stirred to form a polymer admixture.
2. 12.7 parts by weight of the cement binder, 46 parts by weight of the aggregate, 36 parts by weight of the coarse aggregate was added to the mixer forcibly stirred, followed by 2 parts by weight of water, 3 parts by weight of the polymer admixture and nylon fibers and polyvinyl alcohol fibers. 0.3 parts by weight of the fiber reinforcement of the weight ratio of was further mixed and stirred for 2 minutes to prepare a repair polymer-incorporated cemented carbide concrete composition.
<Example 2>
90 parts by weight of hydrophobic acrylic emulsion, 4.5 parts by weight of polyvinyl acetate ethylene latex, 4.5 parts by weight of polystyrene acrylic ester latex, 0.5 part by weight of methacrylamide monomer, and 0.5 part by weight of sodium persulfate, a reaction initiator, were mixed and stirred to form a polymer admixture. It is the same as that of Example 1 except forming.
<Example 3>
85 parts by weight of a hydrophobic acrylic emulsion, 7 parts by weight of polyvinylacetate ethylene latex, 7 parts by weight of polystyrene acrylic ester latex, 0.5 part by weight of methacrylamide monomer, and 0.5 part by weight of sodiumpersulphate as a reaction initiator were mixed and stirred to form a polymer admixture. It is the same as that of Example 1 except forming.
Comparative Examples are presented to more easily understand the characteristics of Examples 1 to 3, and Comparative Examples 1 and 2 below present general portland cement concrete compositions and polymer cement concrete compositions which are currently widely used. It is.
≪ Comparative Example 1 &
In general, 13 parts by weight of Portland cement, 46 parts by weight of fine aggregate, 36 parts by weight of coarse aggregate, and 5 parts by weight of water were added to a mixer and forced stirring to prepare a concrete composition.
Comparative Example 2
Usually, 13 parts by weight of Portland cement, 46 parts by weight of aggregate, and 36 parts by weight of coarse aggregate were added to the mixer forcibly stirred, and then 2 parts by weight of water and 3 parts by weight of acrylic emulsion were further mixed and stirred for 2 minutes to prepare a polymer concrete composition.
The following test examples compare the characteristics of the examples according to the present invention with the characteristics of Comparative Examples 1 and 2 in order to more easily understand the characteristics of Examples 1 to 3 according to the present invention disclosed above Experimental results are shown.
≪ Test Example 1 >
According to KS F 2402 for the repairing polymer mixed superhard concrete composition of Comparative Examples 1 to 3, the concrete composition of Comparative Example 1 and the polymer concrete composition of Comparative Example 2 according to KS F 2402 The slump (degree of dough) test to test the toughness was carried out, the results are shown in Table 1 below. The numerical values shown in Table 1 indicate the change of slump over time, and the larger the numerical value, the better the workability, that is, the workability during concrete pouring.
In Table 1, it was shown that the repairing polymer-incorporated cemented carbide concrete composition of Examples 1 to 3 has a larger change in slump over time than that of Comparative Example 1 and the polymeric concrete composition of Comparative Example 2, Accordingly, it was confirmed that the workability of the polymer-incorporated cemented carbide concrete composition for repairing of Examples 1 to 3 was improved when the concrete was poured.
≪ Test Example 2 &
The compressive strength measurement test was carried out based on KS F 2405 for the repairing polymer-incorporated cemented carbide concrete composition of Example 1 to Example 3, the concrete composition of Comparative Example 1 and the polymer concrete composition of Comparative Example 2, and the measurement The results are shown in Table 2 below.
In Table 2, the repairing polymer-incorporated cemented carbide concrete composition of Examples 1 to 3 was found to have a much higher compressive strength than the concrete composition of Comparative Example 1 and the polymer concrete composition of Comparative Example 2.
<Test Example 3>
The bending strength measurement test was carried out based on KS F 2408 for the repairing polymer mixed superhard concrete composition, the concrete composition of Comparative Example 1, and the polymer concrete composition of Comparative Example 2 of Examples 1 to 3, and the measurement result. Is shown in Table 3 below.
In Table 3, the repairing polymer-incorporated cemented carbide concrete composition of Examples 1 to 3 was found to have a much higher flexural strength than the concrete composition of Comparative Example 1 and the polymer concrete composition of Comparative Example 2.
<Test Example 4>
The adhesive strength measurement test was performed based on KS F 2762 for the repairing polymer mixed superhard concrete composition of Comparative Examples 1 to 3, the concrete composition of Comparative Example 1 and the polymer concrete composition of Comparative Example 2, and the measurement The results are shown in Table 4 below.
In Table 4, the repairing polymer-incorporated cemented carbide concrete composition of Examples 1 to 3 was found to have a much better adhesive strength than the concrete composition of Comparative Example 1 and the polymer concrete composition of Comparative Example 2.
≪ Test Example 5 >
The dry shrinkage rate of the repairing polymer mixed cemented carbide concrete composition of Example 1 to Example 3, the concrete composition of Comparative Example 1 and the polymer concrete composition of Comparative Example 2 based on KS F 2424 which is a test method for changing the length of concrete The measurement results are shown in Table 5 below.
In Table 5, it was found that the repairing polymer-incorporated cemented carbide concrete composition of Examples 1 to 3 has a smaller dry shrinkage rate than the concrete composition of Comparative Example 1 and the polymer concrete composition of Comparative Example 2, and accordingly the Example It was confirmed that the repairing polymer-incorporated cemented carbide concrete composition of Examples 1 to 3 had a shrinkage reducing effect.
<Test Example 6>
The water absorption was measured based on KS F 4004 for the repairing polymer-incorporated cemented carbide concrete composition of Example 1 to Example 3, the concrete composition of Comparative Example 1 and the polymer concrete composition of Comparative Example 2, and the measurement result is as follows. It is shown in Table 6.
In Table 6, the water-containing polymer mixed cemented carbide concrete composition of Examples 1 to 3 was found to have a lower water absorption than the concrete composition of Comparative Example 1 and the polymer concrete composition of Comparative Example 2.
<Test Example 7>
The neutralization penetration depth was measured according to JIS A 1171 for the repairing polymer-incorporated cemented carbide concrete composition of Example 1 to Example 3, the concrete composition of Comparative Example 1 and the polymer concrete composition of Comparative Example 2, and the measurement result. Is shown in Table 7 below.
(Mm)
Table 7 shows that the repairing polymer-incorporated cemented carbide concrete composition of Examples 1 to 3 has a smaller neutralization penetration depth than the concrete composition of Comparative Example 1 and the polymer concrete composition of Comparative Example 2, and accordingly, It was confirmed that the repairing polymer-incorporated cemented carbide concrete composition of Examples 1 to 3 had high resistance to neutralization.
<Test Example 8>
Chloride ion penetration depth was measured according to JIS A 1171 for the repairing polymer-incorporated cemented carbide concrete composition of Example 1 to Example 3, the concrete composition of Comparative Example 1, and the polymer concrete composition of Comparative Example 2, and the measurement thereof. The results are shown in Table 8 below.
Penetration depth (mm)
In Table 8, the repair polymer-incorporated cemented carbide concrete composition of Examples 1 to 3 was found to have a smaller chloride ion penetration depth than the concrete composition of Comparative Example 1 and the polymer concrete composition of Comparative Example 2. It was confirmed that the repairing polymer-incorporated cemented carbide concrete composition of Examples 1 to 3 had high resistance to salt damage.
≪ Test Example 9 >
Freeze-thawing resistance was measured based on KS F 2456 for the repairing polymer-incorporated cemented carbide concrete composition of Example 1 to Example 3, the concrete composition of Comparative Example 1 and the polymer concrete composition of Comparative Example 2, and the measurement result Is shown in Table 13 below.
In Table 9, the repairing polymer-incorporated cemented carbide concrete composition of Examples 1 to 3 was found to have a higher durability index than the concrete composition of Comparative Example 1 and the polymer concrete composition of Comparative Example 2, and accordingly the Example It was confirmed that the durability of the polymer incorporating superhard mirror concrete composition of Examples 1 to 3 was improved.
As mentioned above, although preferred embodiment of this invention was described in detail, this invention is not limited to the said embodiment, A various deformation | transformation by a person of ordinary skill in the art within the scope of the technical idea of this invention is carried out. This is possible.
Claims (8)
The polymer admixture may include 75 to 99 parts by weight of hydrophobic acrylic emulsion, 0.1 to 10 parts by weight of polyvinylacetate ethylene latex, 0.1 to 10 parts by weight of polystyrene acrylic ester latex, 0.01 to 5 parts by weight of methacrylamide monomer, and 0.01 to 5 parts by weight of reaction initiator. Repairing polymer-incorporated cemented carbide concrete composition, characterized in that the addition.
Applying or blooming a primer to the chipped portion;
Applying and molding the repairing polymer-incorporated cemented carbide concrete composition according to claim 1 on the primer coating portion or the blooming treatment portion; And
Repairing method of the concrete structure using the repairing polymer-incorporated cemented carbide concrete composition comprising the step of curing the applied repairing polymer-incorporated cemented carbide concrete composition.
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| KR101456676B1 (en) * | 2014-06-03 | 2014-11-04 | 주식회사 윤창이엔씨 | Early strength polymer modified cement concrete composite and repairing method of concrete structure using the composite |
| KR102475007B1 (en) * | 2021-10-19 | 2022-12-07 | 주식회사 효산화이버 | Manufacturing method of complex fiber reinforcement for concrete or mortar evenly mixed different kind of fibers |
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