KR101873782B1 - Cement mortar composition for repairing concrete structure with improved durability and repairing method of concrete structure therewith - Google Patents

Cement mortar composition for repairing concrete structure with improved durability and repairing method of concrete structure therewith Download PDF

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KR101873782B1
KR101873782B1 KR1020170176754A KR20170176754A KR101873782B1 KR 101873782 B1 KR101873782 B1 KR 101873782B1 KR 1020170176754 A KR1020170176754 A KR 1020170176754A KR 20170176754 A KR20170176754 A KR 20170176754A KR 101873782 B1 KR101873782 B1 KR 101873782B1
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weight
concrete
repairing
cement mortar
mortar composition
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KR1020170176754A
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Korean (ko)
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원용대
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주창종합건설 주식회사
원용대
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B16/00Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B16/04Macromolecular compounds
    • C04B16/06Macromolecular compounds fibrous
    • C04B16/0616Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B16/0625Polyalkenes, e.g. polyethylene
    • C04B16/0633Polypropylene
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/0093Aluminates
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/02Elements
    • C04B22/04Metals, e.g. aluminium used as blowing agent
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08Acids or salts thereof
    • C04B22/10Acids or salts thereof containing carbon in the anion
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24Macromolecular compounds
    • C04B24/26Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24Macromolecular compounds
    • C04B24/28Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/288Halogen containing polymers
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24Macromolecular compounds
    • C04B24/38Polysaccharides or derivatives thereof
    • C04B24/383Cellulose or derivatives thereof
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14Compositions 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 calcium sulfate cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00Hydraulic cements
    • C04B7/02Portland cement
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/72Repairing or restoring existing buildings or building materials

Abstract

The present invention relates to a cement mortar composition for repairing a concrete structure with enhanced durability, and a method of repairing a concrete structure using the same. The cement mortar composition for repairing a concrete structure with enhanced durability comprises: 3-75 wt% of a rapid hardening inorganic binder; 20-70 wt% of a fine aggregate; 1-35 wt% of a performance modifier; and 4-30 wt% of water. The rapid hardening inorganic binder comprises: 20-93 wt% of early strength type Portland cement; 1-20 wt% of tricalcium aluminate; 1-20 wt% of blast furnace slag fine powder having a powder degree of 3,000 to 8,500 cm^2/g; 1-20 wt% of magnesite; 1-10 wt% of hydroxycarbonate; 1-10 wt% of gypsum; and 1-10 wt% of aluminum powder. According to the present invention, a cement mortar composition is a rapid hardening type and exhibits high strength and excellent durability, thereby reducing a construction period, increasing the use period of a construction, and reducing costs on maintenance and repair work.

Description

TECHNICAL FIELD [0001] The present invention relates to a cement mortar composition for repairing a concrete structure having improved durability and a method for maintenance of a concrete structure using the same. BACKGROUND OF THE INVENTION 1. Field of the Invention [0002]

The present invention relates to a cement mortar composition for repairing a concrete structure having improved durability and a method of maintaining and repairing a concrete structure using the same. More specifically, the present invention relates to a cement mortar composition for repairing a concrete structure, It is possible to reduce the construction time and shorten the construction period. It has excellent durability such as strength, adhesion performance, chloride penetration resistance, neutralization resistance and waterproof property, thus improving the durability to increase the durability of concrete structure, reduce maintenance cost and improve workability. The present invention relates to a cement mortar composition for repairing a concrete structure and a method for maintenance of a concrete structure using the same.

Generally, cracks in concrete structures can lead to fatal defects such as deterioration of performance, corrosion of reinforcing steel, deterioration of durability, and decrease of strength. Cracks in concrete occur frequently due to various factors such as material characteristics such as design load, plastic shrinkage or drying shrinkage, mixing conditions, and construction factors, such as causes of external environment such as deterioration and deterioration. If cracks occur in the concrete structure due to various factors such as these, the concrete structure may fail to bear the load and may collapse.

Also, since the performance of concrete decreases gradually after a certain period of time after casting or molding, the concrete structure should be repaired and reinforced periodically. The deterioration of the performance of the concrete is a crack, and when cracks occur, harmful outside air, moisture and chemical components permeate inside the concrete, thereby further deteriorating the performance of the concrete. In addition, due to the corrosion of the reinforcing bars inside the concrete structure due to moisture and chloride ions penetrating into the concrete, additional cracks occur or concrete falls off, and at the same time, the reinforcing steel section is reduced by the corrosion of the reinforcing bars, The structure may be damaged.

    On the other hand, underground and exponential structures such as reinforced concrete structures, concrete slabs, road sidewalls, bridge wing walls, central separation walls, hydraulic structures such as agricultural waterways and aqueducts, sewer pipes, wastewater treatment plants, chemical facilities, The compressive strength of the concrete and the tensile strength of the reinforcing bar are gradually decreased when the time passes, and the concrete exposed through the cracks is subjected to neutralization and corrosion of the reinforcing steel occurs. If these rebar corrosion phenomena become severe, the concrete structure may eventually collapse. Research and development of materials and methods for repairing and repairing areas where corrosion and erosion are frequently occurring are being continuously studied.

Korean Registered Patent No. 10-0772621 (Notice of November 02, 2007) Korean Patent No. 10-1631601 (issued on June 17, 2016)

The problems to be solved by the present invention are that it is excellent in workability and workability and can be cured within a short period of time, shortening the construction period, reducing the construction cost and shortening the maintenance period, and improving the strength, adhesive strength, chloride penetration resistance, The present invention provides a cement mortar composition for repairing a concrete structure having improved durability that can increase the durability of the concrete structure, reduce the maintenance cost and improve the workability, and provide a maintenance method for a concrete structure using the same.

The present invention relates to a process for the preparation of a performance modifier comprising 3 to 75% by weight of a fast light inorganic binder, 20 to 70% by weight of fine aggregate, 1 to 35% by weight of a performance modifier and 4 to 30% By weight of styrene-butadiene copolymer, 1 to 20% by weight of tertiary butyl methacrylate, 1 to 15% by weight of bismaleimide and 1 to 15% by weight of polychlorotrifluoroethylene 1 To 10% by weight of the cement mortar composition for repairing concrete structures.

The performance modifier may further include a blend of a naphthalene fluidizing agent and a polycarboxylic acid fluidizer to improve fluidity in a weight ratio of 1: 0.01 to 0.8 in an amount of 0.01 to 5 wt% based on the weight of the performance modifier.

In addition, the performance modifier may further include a cellulose acetic acid butyrate mixture in an amount of 0.01 to 5 wt% based on the weight of the performance modifier to prevent material separation.

The performance modifier can also be used to prevent the formation of defects on surfaces such as brush marks, roller marks, orange peaks, cratering, pinholes, color stains, etc. Dimethylpolysiloxane 0.01 to 5% by weight.

In addition, the performance modifier may further include an antifoaming agent for reducing an increase in the amount of air due to the generation of entrained air, in an amount of 0.01 to 5 wt% based on the weight of the performance modifier.

Wherein the fast-type inorganic binder comprises 20 to 93% by weight of crude steel portland cement, 1 to 20% by weight of tricalcium aluminate, 1 to 20% by weight of fine blast furnace slag powder having a powder degree of 3,000 to 8,500 cm 2 / g, 1 to 20% by weight of magnesite, 1 to 10% by weight of magnesium hydroxycarbonate, 1 to 10% by weight of gypsum, and 1 to 10% by weight of aluminum powder.

In order to improve strength and durability, the fast-curing inorganic binder may further contain 0.01 to 10% by weight of kaolin based on the weight of the fast slow inorganic binder.

In order to improve the warp and tensile strength, initial plastic cracking, and fracture toughness, the fast-curing inorganic binder may further comprise at least one material selected from polypropylene fiber, polyester fiber, nylon fiber and macro fiber, 0.01 to 10% by weight.

In addition, the fast-curing inorganic binder may further contain 0.01 to 10% by weight of fluorinated sodium to improve the strength, corrosion resistance, antifouling, preservation, etc., based on the weight of the fast slow inorganic binder.

In addition, the above-mentioned fast-type inorganic binder is preferably one selected from the group consisting of polycarboxylic acid, naphthalene, melamine and lignin high-performance water reducing agents for improving the watertightness and freeze-thaw resistance and improving durability by tightening the internal structure of the cement- Or more of the above materials may be added in an amount of 0.01 to 10% by weight relative to the weight of the fast-slow inorganic binder.

In addition, the fast-curing inorganic binder may further contain 0.01 to 10 wt% of a retarder for delaying the rapid curing, relative to the weight of the fast-slow inorganic binder.

In addition, the fast-type inorganic binder may further include 0.01 to 10% by weight of a pigment for improving the appearance and a hue to the weight of the fast-slow inorganic binder.

The present invention also provides a method of manufacturing a concrete structure, comprising the steps of: removing an impurity or a deteriorated portion of a concrete structure by a grinder, a planer, a shot blaster or the like, removing the chipped portion with a hand water jet, a vacuum inhaler, Applying a primer for improving adhesion of a cement mortar composition for repairing concrete structures, inhibiting penetration of water and penetration of chlorine ions, and improving water resistance and waterproofing property, and applying a primer to the concrete structure repair cement Laying mortar composition using equipment to spray; Surface finishing of the surface using a trowel or a sponge before the applied composition is completely cured: A surface protective agent is applied on the upper surface of the surface-finished portion in order to improve resistance to salt, neutralization resistance, surface hardness, water resistance and water resistance ; And curing the concrete structure.

The cement mortar composition for repairing concrete structures of the present invention is excellent in workability, workability, strength, chlorine ion penetration resistance, neutralization resistance, water resistance and durability, so that it is possible to increase the durability of concrete structures, reduce maintenance cost and improve workability .

Also, the cement mortar composition for repairing concrete structures of the present invention is excellent in workability and workability, and is cured within a short period of time, shortening the construction period, thereby reducing the construction cost and shortening the repair period.

According to the concrete structure repair method using the cement mortar composition for repairing the concrete structure of the present invention, the cement mortar composition for repairing the concrete structure exhibits high strength and durability, thereby shortening the construction period and increasing the use period of the structure It is possible to reduce the maintenance cost as well as to have excellent strength and durability, which can increase the maintenance period and reduce maintenance cost.

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

Hereinafter, the concrete structure refers to concrete structures such as hydraulic structures, sewage pipes, wastewater treatment plants, etc. that are not only ordinary roads and highways but also facility structures (a central separation wall, a wing wall, a sidewall concrete, an underground roadway, a retaining wall) It is used to mean all structures made of concrete including underground and exponential structures, chemical facilities, and offshore structures.

The cement mortar composition for repairing concrete structures according to a preferred embodiment of the present invention comprises a fast-slow inorganic binder, a fine aggregate, a performance modifier, and water.

The rapid-hardening inorganic binder is preferably contained in an amount of 3 to 75 wt% based on the weight of the cement mortar composition for repairing the concrete structure.

The fine aggregate is preferably contained in an amount of 20 to 70% by weight based on the weight of the cement mortar composition for repairing the concrete structure. Aggregates are classified into fine aggregate and coarse aggregate. Hereinafter, those having a grain size of 5 mm or less are called fine aggregate. The fine aggregate is preferably silica sand mixed with silica sand No. 4: No. 6 in a weight ratio of 0.1 to 0.4: 0.6: 0.9.

The performance modifier serves to improve the warpage, tensile and adhesion strength, improve workability and durability, and has high fluidity (self-leveling) by forming a film in the cement mortar cured product. The concrete modifying cement mortar But it is preferably contained in an amount of 1 to 35% by weight based on the weight of the composition.

Wherein the fast-type inorganic binder comprises 20 to 93% by weight of crude steel Portland cement, 1 to 20% by weight of tricalcium aluminate, 1 to 20% by weight of blast furnace slag fine powder having a powder degree of 3,000 to 8,500 cm 2 / 1 to 20% by weight of magnesite, 1 to 10% by weight of magnesium hydroxycarbonate, 1 to 10% by weight of gypsum, and 1 to 10% by weight of aluminum powder.

The fast-curing inorganic binder may further comprise 0.01 to 10% by weight of kaolin to improve strength and durability.

In order to improve the warp and tensile strength, initial plastic cracking, and fracture toughness, the fast-curing inorganic binder may further comprise at least one material selected from polypropylene fiber, polyester fiber, nylon fiber and macro fiber, 0.01 to 10% by weight.

In addition, the fast-curing inorganic binder may further contain 0.01 to 10% by weight of fluorinated sodium to improve the strength, corrosion resistance, antifouling, preservation, etc., based on the weight of the fast slow inorganic binder.

In addition, the above-mentioned fast-type inorganic binder is preferably one selected from the group consisting of polycarboxylic acid, naphthalene, melamine and lignin high-performance water reducing agents for improving the watertightness and freeze-thaw resistance and improving durability by tightening the internal structure of the cement- Or more of the above materials may be added in an amount of 0.01 to 10% by weight relative to the weight of the fast-slow inorganic binder.

In addition, the fast-curing inorganic binder may further contain 0.01 to 10 wt% of a retarder for delaying the rapid curing, relative to the weight of the fast-slow inorganic binder.

In addition, the fast-type inorganic binder may further include 0.01 to 10% by weight of a pigment for improving the appearance and a hue to the weight of the fast-slow inorganic binder.

The crude steel portland cement is preferably the one specified in KS, and the crude steel portland cement distributed in the general market can be used. The crude steel portland cement preferably contains 20 to 93% by weight based on the weight of the fast-slow inorganic binder.

The tricalcium aluminate is a mineral-based ultra rapid-speed curing material which, when mixed with cement, enables the compressive strength of ordinary Portland cement to be obtained within a few hours or days. The tri-calcium aluminate is preferably contained in an amount of 1 to 20% by weight based on the weight of the fast-slow inorganic binder. If the content of the tricalcium aluminate is less than 1% by weight, initial strength development and durability performance may be insufficient. If the content is more than 20% by weight, workability and price competitiveness may be deteriorated.

The powder blast furnace slag powder and magnesite having a powder viscosity of 3,000 ~ 8,500 cm 2 / g is a latent hydraulic fine powder which improves the long term strength of the cement hardened body and tightens the hydrated structure of the cement hardened body to increase chemical resistance and durability do. It is preferable that the blast furnace slag powder and the magnesite having a powder degree of 3,000 to 8,500 cm 2 / g are each contained in an amount of 2 to 40% by weight based on the weight of the fast-slow inorganic binder. If the content of the fine powder of slag and the magnesite is 3,000 ~ 8,500 cm 2 / g, the effect of improving the long-term strength and improving the durability is lowered. If the content of the fine powder is more than 40% .

The above-mentioned magnesium hydroxycarbonate is used for improving strength, abrasion resistance and fire resistance. The magnesium hydroxycarbonate preferably contains 1 to 10% by weight based on the weight of the fast-slow inorganic binder. If the content of the magnesium hydroxycarbonate is less than 1% by weight, the strength, abrasion resistance and fire resistance deteriorate. If the content exceeds 10% by weight, the performance is improved but the workability is deteriorated.

The gypsum is used for initial strength development. The gypsum can be anhydrous gypsum or anthracite. As the content of gypsum increases, it shows fast curing properties. The gypsum is preferably contained in an amount of 1 to 10% by weight based on the weight of the fast-slow inorganic binder. If the content of gypsum is less than 1% by weight, the effect of initial strength development may be insignificant. If the content is more than 10% by weight, workability and water resistance may be deteriorated.

The aluminum powder is used for improving the strength, abrasion resistance and chemical resistance of the composition. The aluminum powder is preferably contained in an amount of 1 to 10% by weight based on the weight of the fast-slow inorganic binder. If the content of the aluminum powder is less than 1 wt%, the effect of improving performance may be insufficient. If the content of aluminum powder is more than 10 wt%, the performance may be improved but the workability and water resistance may be deteriorated.

The kaolin is used to improve strength and durability. The kaolin is preferably contained in an amount of 0.1 to 10% by weight based on the weight of the fast-slow inorganic binder. If the content of kaolin is less than 0.1 wt%, the effect of improving the performance may be insignificant. If the content of kaolin is more than 10 wt%, the performance may be improved but the initial strength development may be deteriorated.

At least one of the polypropylene fiber, the polyethylene fiber, the nylon fiber and the macro fiber is used to prevent the flexural strength, the tensile strength, the initial plastic crack and the fracture toughness of the composition. It is preferable that at least one of the polypropylene fiber, the polyethylene fiber, the nylon fiber and the macro fiber is contained in an amount of 0.01 to 10% by weight based on the weight of the fast-slow inorganic binder. If the content of at least one of the polypropylene fiber, the polyethylene fiber, the nylon fiber and the macro fiber is less than 0.01% by weight, the effect of strength development and the effect of preventing cracking may be weak. If the content is more than 10% And water resistance may be deteriorated.

The sodium fluoride can be used for strength, corrosion resistance, antifouling, antiseptic and the like. The sodium fluoride is preferably contained in an amount of 0.01 to 10% by weight based on the weight of the fast-slow inorganic binder. If the content of sodium fluoride is less than 0.01% by weight, the effect of strength, corrosion resistance, antifouling and antifouling performance may be insignificant. If the content of sodium fluoride is less than 0.01% by weight, When the content of sodium is more than 10% by weight, the strength development is lowered and the manufacturing cost is increased, which is not economical.

The at least one material selected from the group consisting of polycarboxylic acid, naphthalene, melamine and lignin-based high-performance water reducing agents is dense in the internal structure of the cement hardened body to improve watertightness and freeze- It is preferable that at least one material selected from the above polycarboxylic acids, naphthalene, melamine and lignin-based high-performance water reducing agents is contained in an amount of 0.01 to 10% by weight based on the weight of the fast-slow inorganic binder.

The retarder is used for delaying rapid curing to ensure workability for a certain period of time, and preferably contains 0.01 to 10% by weight based on the weight of the fast-slow inorganic binder. Examples of the delaying agent include generally known substances such as glucose, glucose, a sugar such as dextran, glucuronic acid, malic acid, citric acid, an acid such as citric acid or a salt thereof, an aminocarboxylic acid, A salt thereof, a phosphonic acid or a derivative thereof, and a polyhydric alcohol such as glycerin.

The pigment is used for improving hue and color, and is preferably contained in an amount of 0.01 to 10% by weight based on the weight of the fast-slow inorganic binder. The pigment is added for easy identification, is easier to identify with a sharper color, and color persistence can be improved. The pigment may be at least one material selected from red iron oxide, yellow iron oxide, chromium oxide (CrO 3 ), purple iron oxide and black iron oxide (carbon black), whereby red, green, yellow, , And white.

The performance modifier is dispersed in a cement mortar cured product to form a film inside the cured mortar cured product to improve warpage, tensile and adhesion strength and improve water retention, thereby improving durability such as neutralization, chloride ion penetration, freezing and thawing .

Wherein the performance modifier is selected from the group consisting of 50 to 95 weight percent styrene-vinyl acetate copolymer, 1 to 25 weight percent styrene-butadiene copolymer, 1 to 20 weight percent tertiary butyl methacrylate, 1 weight percent bismaleimide To 15 wt% and polychlorotrifluoroethylene 1 to 10 wt%.

The styrene-vinyl acetate copolymer not only improves warpage, tensile and adhesion strength, but also improves durability due to the polymer film. The styrene-vinyl acetate copolymer is preferably contained in an amount of 50 to 95% by weight based on the weight of the performance modifier. If the content of the styrene-vinyl acetate copolymer is less than 50% by weight, the effect of improving the strength and durability is deteriorated. If the content of the styrene-vinyl acetate copolymer is more than 95% by weight,

The styrene-butadiene copolymer is added to improve strength and durability. The styrene-butadiene copolymer is preferably contained in an amount of 1 to 25 wt% based on the weight of the performance modifier. When the content of the styrene-butadiene copolymer is less than 1% by weight, the strength and durability are decreased. When the content of the styrene-butadiene copolymer exceeds 25% by weight, the performance is improved but the workability is likely to be deteriorated.

The tertiary butyl methacrylate improves strength and durability after curing, thereby preventing dropout after adhesion. The tertiary butyl methacrylate is preferably contained in an amount of 1 to 20% by weight based on the weight of the performance modifier. If the content of tertiary butyl methacrylate is less than 1% by weight, the strength and durability are deteriorated. If the content of tertiary butyl methacrylate is more than 20% by weight, the viscosity is lowered and the material is likely to be separated.

The bismaleimide is added to improve strength and durability. The bismaleimide is preferably contained in an amount of 1 to 15 wt% based on the weight of the performance modifier. When the content of bismaleimide is less than 1% by weight, the effect of improving the strength and durability is insufficient. When the content of bismaleimide is more than 15% by weight, the viscosity is low and the material separation phenomenon tends to occur.

The polychlorotrifluoroethylene is used for improving the surface hardness and the water resistance. The polychlorotrifluoroethylene is preferably contained in an amount of 1 to 10% by weight based on the weight of the performance modifier. If the content of the polychlorotrifluoroethylene is less than 1 wt%, the effect of improving the surface hardness and the water resistance is insufficient. If the content exceeds 10 wt%, the viscosity increases and the workability decreases.

The performance modifier may further comprise 0.01 to 5% by weight, based on the weight of the performance modifier, of a mixture of naphthalene fluidizing agent and polycarboxylic acid fluidizing agent in a weight ratio of 1: 0.01 to 0.8 to improve fluidity.

The performance modifier may further comprise 0.01 to 5% by weight of a mixture of acetic acid cellulose acetate butyrate to prevent material separation.

The performance modifier can also be used to prevent the formation of defects on surfaces such as brush marks, roller marks, orange peaks, cratering, pinholes, color stains, etc. Dimethylpolysiloxane 0.01 to 5% by weight.

In addition, the performance modifier may further include an antifoaming agent for reducing an increase in the amount of air due to the generation of entrained air, in an amount of 0.01 to 5 wt% based on the weight of the performance modifier.

The cement mortar composition for repairing a concrete structure according to a preferred embodiment of the present invention can be prepared by mixing a fast light inorganic binder, a fine aggregate, a performance modifier, and water, wherein the fast light inorganic binder is a cement mortar composition for repairing the concrete structure Wherein the fine aggregate is contained in an amount of from 3 to 75% by weight based on the weight of the cement mortar composition, and the fine aggregate is contained in an amount of from 20 to 70% by weight based on the weight of the cement mortar composition for repairing the concrete structure, And the water is contained in an amount of 4 to 30% by weight based on the weight of the cement mortar composition for repairing the concrete structure.

The method for maintaining a concrete structure using a cement mortar composition for repairing a concrete structure according to the present invention includes the steps of removing impurities or deteriorated portions of a concrete structure by a grinder, a planer, a shot blaster, , A vacuum inhaler, etc., applying a primer for improving the adhesion of the concrete concrete and the cement mortar composition for repairing the concrete structure, suppressing penetration of water and infiltration of chlorine ions, and improving water resistance and waterproofing property Placing a cement mortar composition for repairing a concrete structure on the upper portion coated with the primer using a device for spraying the cement mortar composition; Surface finishing of the surface using a trowel or sponge before the applied composition is completely cured: a surface protective agent is applied on the top of the surface-finished portion in order to improve resistance to salt, neutralization resistance, surface hardness, water resistance and water resistance ; And curing.

The primer may be at least one selected from the group consisting of styrene-butadiene latex, polyacrylic ester, acryl, ethyl vinyl acetate, methyl methacrylate, and the performance modifier, but is not limited thereto.

The surface protective agent may be at least one selected from the group consisting of acryl-urethane, ceramic (water-based silica sol) surface protective agent, and silane penetration enhancer, but is not limited thereto.

Hereinafter, embodiments of the cement mortar composition for repairing concrete structures according to the present invention will be more specifically shown, and the present invention is not limited by the following embodiments.

≪ Example 1 >

45 wt% of a slow-type inorganic binder, 45 wt% of a fine aggregate, and 4 wt% of a performance modifier were added to a forced mixer and stirred. Then, 6 wt% of water was further mixed and then stirred for 2 minutes to prepare a cement mortar composition for repairing a concrete structure .

At this time, the fast-type inorganic binder is composed of 47 wt% of crude steel Portland cement, 15 wt% of tricalcium aluminate, 10 wt% of blast furnace slag, 10 wt% of magnesite, 5 wt% of magnesium hydroxycarbonate, 3% by weight of powder, 2% by weight of kaolin, 1% by weight of sodium fluoride, 0.5% by weight of a citric acid retarder, 0.5% by weight of a polycarboxylic acid high performance water reducing agent, 0.5% by weight of nylon fiber and 0.5% by weight of pigment.

The performance modifier was a mixture of 94 wt% styrene-vinyl acetate copolymer, 1 wt% styrene-butadiene copolymer, 1 wt% tertiary butyl methacrylate, 1 wt% bismaleimide, 1 wt% polychlorotrifluoroethylene, 0.5% by weight of a defoaming agent, 0.5% by weight of a fluidizing agent, 0.5% by weight of cellulose acetate cellulose acylate, and 0.5% by weight of dimethylpolysiloxane.

At this time, the fluidizing agent was a fluidizing agent mixture in which a naphthalene fluidizing agent and a polycarboxylic acid fluidizing agent were mixed at a weight ratio of 1: 0.2.

≪ Example 2 >

45 wt% of a slow-type inorganic binder, 45 wt% of a fine aggregate, and 4 wt% of a performance modifier were added to a forced mixer and stirred. Then, 6 wt% of water was further mixed and then stirred for 2 minutes to prepare a cement mortar composition for repairing a concrete structure .

At this time, the fast-type inorganic binder is composed of 47 wt% of crude steel Portland cement, 15 wt% of tricalcium aluminate, 10 wt% of blast furnace slag, 10 wt% of magnesite, 5 wt% of magnesium hydroxycarbonate, 3% by weight of powder, 2% by weight of kaolin, 1% by weight of sodium fluoride, 0.5% by weight of a citric acid retarder, 0.5% by weight of a polycarboxylic acid high performance water reducing agent, 0.5% by weight of nylon fiber and 0.5% by weight of pigment.

The performance modifier was a mixture of 86 wt% styrene-vinyl acetate copolymer, 3 wt% styrene-butadiene copolymer, 3 wt% tertiary butyl methacrylate, 3 wt% bismaleimide, 3 wt% polychlorotrifluoroethylene, 0.5% by weight of a defoaming agent, 0.5% by weight of a fluidizing agent, 0.5% by weight of cellulose acetate cellulose acylate, and 0.5% by weight of dimethylpolysiloxane.

At this time, the fluidizing agent was a fluidizing agent mixture in which a naphthalene fluidizing agent and a polycarboxylic acid fluidizing agent were mixed at a weight ratio of 1: 0.2.

≪ Example 3 >

45 wt% of a slow-type inorganic binder, 45 wt% of a fine aggregate, and 4 wt% of a performance modifier were added to a forced mixer and stirred. Then, 6 wt% of water was further mixed and then stirred for 2 minutes to prepare a cement mortar composition for repairing a concrete structure .

At this time, the fast-type inorganic binder is composed of 47 wt% of crude steel Portland cement, 15 wt% of tricalcium aluminate, 10 wt% of blast furnace slag, 10 wt% of magnesite, 5 wt% of magnesium hydroxycarbonate, 3% by weight of powder, 2% by weight of kaolin, 1% by weight of sodium fluoride, 0.5% by weight of a citric acid retarder, 0.5% by weight of a polycarboxylic acid high performance water reducing agent, 0.5% by weight of nylon fiber and 0.5% by weight of pigment.

The performance modifier was a mixture of 78 wt% styrene-vinyl acetate copolymer, 5 wt% styrene-butadiene copolymer, 5 wt% tertiary butyl methacrylate, 5 wt% bismaleimide, 5 wt% polychlorotrifluoroethylene, 0.5% by weight of a defoaming agent, 0.5% by weight of a fluidizing agent, 0.5% by weight of cellulose acetate cellulose acylate, and 0.5% by weight of dimethylpolysiloxane.

At this time, the fluidizing agent was a fluidizing agent mixture in which a naphthalene fluidizing agent and a polycarboxylic acid fluidizing agent were mixed at a weight ratio of 1: 0.2.

In order to compare the physical properties of the cement mortar composition for repairing concrete structures produced according to the above-described Examples 1 to 3, a cement mortar composition which is generally widely used at present is presented as Comparative Example 1. [

≪ Comparative Example 1 &

45% by weight of Portland cement and 45% by weight of fine aggregate were added to a forced mixer and stirred. Then, 9% by weight of water was further mixed and stirred for 2 minutes. 1% by weight of a polycarboxylic acid high performance water reducing agent was added to prepare a cement mortar composition .

≪ Test Example 1 > Preparation of test specimens

(Polymer cement mortar for repairing concrete structures) according to the formulations shown in Examples 1 to 3 and Comparative Examples 1 and 2, and the test pieces having dimensions of 40 x 40 x 160 mm (for bending and compressive strength testing, (For permeability test and water absorption coefficient test), ø150 × 5mm (for moisture permeation resistance test), ø100 × 50mm (for chloride ion penetration resistance test), 100 × 100 × 100mm (for neutralization resistance test) ) And 70 × 70 × 20mm cement mortar board with 40 × 40 × 10mm (for bonding strength test) molds. Cements were cured by curing in consideration of the field conditions.

≪ Test Example 2 >

In order to compare the strength characteristics of the composition prepared according to Examples 1 to 3 and the composition prepared according to Comparative Example 1, the specimens prepared in Test Example 1 were subjected to compression and bending strength tests, Bond strength test was performed, and the results are shown in Tables 1 and 2 below.

division Strength (N / mm 2 ) compression warp 4 hours 1 day 7 days 28th 4 hours 1 day 7 days 28th Example 1 28.5 36.5 45.5 49.8 6.0 8.5 9.9 11.0 Example 2 29.9 38.8 47.3 53.5 6.5 9.0 10.2 11.9 Example 3 30.5 39.8 49.2 56.2 7.1 9.3 10.8 12.5 Comparative Example 1 - 22.0 36.2 45.9 - 2.2 4.8 6.5

As shown in Table 1, the compositions prepared according to Examples 1 to 3 have superior bending strength and compressive strength as compared with the composition prepared according to Comparative Example 1.

division Bond strength (N / mm 2 ) Standard condition After warm-cold repeat 4 hours 1 day 7 days 28th 4 hours 1 day 7 days 28th Example 1 1.5 1.7 1.9 2.0 1.3 1.5 1.7 1.9 Example 2 1.6 1.8 2.0 2.2 1.4 1.6 1.8 2.0 Example 3 1.6 1.9 2.1 2.3 1.5 1.8 1.9 2.1 Comparative Example 1 - - 1.0 1.5 - - 0.8 1.0

As shown in Table 2, it was found that the compositions prepared according to Examples 1 to 3 had much higher bonding strength than the compositions prepared according to Comparative Example 1. [

≪ Test Example 3 >

The compositions prepared according to Examples 1 to 3 and the composition prepared according to Comparative Example 1 were tested for alkali resistance, neutralization resistance, water permeability, water absorption coefficient, moisture permeation resistance, chloride ion penetration resistance, The results are shown in Table 3 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Alkali resistance (N / mm 2 ) 45.0 50.5 53.2 30.5 Neutralization resistance (mm) 0.9 0.7 0.5 1.8 Permeability (g) 3.0 2.2 1.8 11.5 Water absorption coefficient (kg / m 2 · h 0.5 ) 0.2 0.15 0.1 0.4 Moisture permeation resistance (Sd, m) 1.2 1.0 0.9 1.8 Chloride ion penetration resistance (Coulombs) 550 508 495 1,350 Length change rate (%) 0.04 0.02 0.01 0.10

As shown in Table 3, the compositions prepared according to Examples 1 to 3 exhibited excellent performance as compared with the compositions prepared according to Comparative Example 1. [

≪ Test Example 4 >

The composition prepared according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 were subjected to a freeze-thaw resistance test according to the method defined in KS F 2456. Freezing and thawing means that the water absorbed in the concrete is frozen and melted. When freezing and thawing is repeated, fine cracks are generated in the concrete structure, and the durability is lowered.

Table 4 shows durability indices of the respective examples and comparative examples according to the freeze-thaw resistance test.

division Example 1 Example 2 Example 3 Comparative Example 1 Durability index 90 91 92 66

As shown in Table 4, the durability indexes of Examples 1 to 3 are much higher than those of Comparative Example 1, and thus the resistance to freezing and thawing is improved.

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

Claims (4)

delete A cement mortar composition for repairing concrete structures,
From 3 to 75% by weight of a slow-type inorganic binder, from 20 to 70% by weight of fine aggregate, from 1 to 35% by weight of a performance modifier, and from 4 to 30%
Wherein the performance modifier is selected from the group consisting of 50 to 95 weight percent styrene-vinyl acetate copolymer, 1 to 25 weight percent styrene-butadiene copolymer, 1 to 20 weight percent tertiary butyl methacrylate, 1 weight percent bismaleimide 0.01 to 5% by weight of a mixture of naphthalene fluidizing agent and polycarboxylic acid fluidizing agent in a weight ratio of 1: 0.01 to 0.8, 15 to 15% by weight of polychlorotrifluoroethylene, 1 to 10% 0.01 to 5% by weight of a cellulose acetate butyrate mixture, 0.01 to 5% by weight of dimethylpolysiloxane, and 0.01 to 5% by weight of an antifoaming agent;
Wherein the fast-type inorganic binder comprises 20 to 93% by weight of crude steel portland cement, 1 to 20% by weight of tricalcium aluminate, 1 to 20% by weight of fine blast furnace slag powder having a powder degree of 3,000 to 8,500 cm 2 / g, 1 to 20% by weight of magnesite, 1 to 10% by weight of magnesium hydroxycarbonate, 1 to 10% by weight of gypsum and 1 to 10% by weight of aluminum powder
Wherein the cement mortar composition is a cement mortar composition for repairing concrete structures.
3. The method of claim 2,
Wherein said fast-slow inorganic binder is 0.01 to 10% by weight of kaolin, 0.01 to 10% by weight of at least one material selected from polypropylene fibers, polyester fibers, nylon fibers and macro fibers, 0.01 to 10% by weight of sodium fluoride, 0.01 to 10% by weight of at least one material selected from the group consisting of naphthalene, melamine and lignin high-performance water reducing agents, 0.01 to 10% by weight of retarding agent, and 0.01 to 10% by weight of pigment.
A concrete structure maintenance method using the cement mortar composition for repairing a concrete structure according to any one of claims 2 to 3,
Chipping the impurity or deteriorated portion of the concrete structure and cleaning the chipped portion;
Applying a primer to the cleaned area;
Placing a cement mortar composition for repairing a concrete structure according to any one of claims 2 to 3 on the primer-coated upper part using a spraying equipment;
Finishing the surface before the applied composition is completely cured:
Applying a surface protective agent on top of a surface-finished portion to improve resistance to salt, neutralization resistance, surface hardness, water resistance, and water resistance; And
Curing step
Wherein the method further comprises the steps of:
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KR101964367B1 (en) * 2018-07-04 2019-04-02 김형진 Composition for repairing and reinforcing concrete structure and method for repairing and reinforcing concrete structure therewith
KR102337098B1 (en) * 2021-03-31 2021-12-09 남경건설(주) Crack reduction type eco-friendly quick-hardening cement concrete composition and road repairing method using the same
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