KR101590547B1 - Mortar Composition for Repairing And Reinforcing Cross Section of Concrete Structures And Method of Repairing And Reinforcing Cross Section of Concrete Structures Using the Same - Google Patents

Mortar Composition for Repairing And Reinforcing Cross Section of Concrete Structures And Method of Repairing And Reinforcing Cross Section of Concrete Structures Using the Same Download PDF

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KR101590547B1
KR101590547B1 KR1020150131142A KR20150131142A KR101590547B1 KR 101590547 B1 KR101590547 B1 KR 101590547B1 KR 1020150131142 A KR1020150131142 A KR 1020150131142A KR 20150131142 A KR20150131142 A KR 20150131142A KR 101590547 B1 KR101590547 B1 KR 101590547B1
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weight
concrete
parts
section
mortar
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박준호
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주식회사 성민이엔씨
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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
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/06—Quartz; Sand
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/30—Oxides other than silica
    • C04B14/303—Alumina
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/30—Oxides other than silica
    • C04B14/305—Titanium oxide, e.g. titanates
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/30—Oxides other than silica
    • C04B14/306—Zirconium oxide
    • 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
    • C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/281—Polyepoxides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
    • C04B41/48—Macromolecular compounds
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
    • 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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  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Architecture (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
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Abstract

The present invention improves the adhesion strength with the cross section of the concrete by expanding the adhesive component after the construction and improves the stability of the latex and improves the durability by increasing the adhesion force and elasticity with the damaged section of the concrete. The mortar for repairing and reinforcing a section of a concrete according to the present invention comprises a main portion including cement, aggregate, water-soluble latex and water; 6 to 12 parts by weight of a curing agent containing hexafluoroantimonate in the liquid type thermosetting epoxy resin based on 100 parts by weight of the main component; 1 to 3 parts by weight of inorganic particles selected from silica, alumina, zirconia, titanium oxide, zinc oxide, germanium oxide, indium oxide, tin oxide and mixtures thereof based on 100 parts by weight of the main component; And 5 to 15 parts by weight of a heat generating pellet made by mixing and firing a ferromagnetic ferrite and a metal oxide powder containing magnesium based on 100 parts by weight of the main component.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mortar for reinforcing concrete sections and a method for repairing and reinforcing concrete sections using the same,

More particularly, the present invention relates to a mortar for repairing and reinforcing a section of concrete, and more particularly, to a method for repairing and reinforcing a mortar which improves the stability of a latex, And to improve the durability of the concrete by increasing the adhesion and elasticity with the aggregate, and to a method of repairing and reinforcing concrete section using the mortar.

Concrete structures are subjected to various natural or artificial actions after construction, resulting in physical performance deterioration due to physical and chemical deformation depending on the service years. Especially, in recent years, there has been an increasing effort to restore safety and performance by carrying out maintenance in terms of securing safety and performance of construction structures. When the aging phenomenon of the construction structure accelerates, it causes the sectional defects in the structure, that is, the concrete portion due to the expansion pressure caused by the corrosion of steel bars, freezing and thawing, and carbonation, resulting in safety in terms of aesthetics, structural strength, And the like.

In order to remedy such problems, when the maintenance or reinforcement is carried out, the function of the structure should be suspended due to the suspension of the use of the structure during the construction period. Reinforced concrete made of general cement has strength due to the binding force of hydraulic component. Reinforced concrete structures using ordinary cement and aggregates deteriorate due to various causes. Typically, the damage of concrete caused by the action of physical force or the corrosion of reinforcing bars caused by the chloride introduced through various paths reduces the strength of the reinforced concrete itself This will have a serious effect on the aesthetics as well as on the structure.

Therefore, in order to restore the section to its original performance and form after removing the concrete part including the deterioration factor such as detachment or detachment of the section of the structure due to deterioration of concrete, corrosion of steel, Fill or spray and apply repair.

Cement mortar or polymer cement mortar is used as the conventional section repairing reinforcement for the section repair. Such conventional conventional repair stiffeners are designed to suppress the deterioration of existing structures, which serve as repairing reinforcements, and to enhance the durability of the present invention. There is a problem that maintenance work is required.

Registration No. 10-1096513 (registered on December 14, 2011) Registered Patent No. 10-0801423 (Registered on Jan. 29, 2008) Registration No. 10-1547895 (Registered on August 21, 2015)

It is an object of the present invention to solve the above-mentioned problems of the prior art, and it is an object of the present invention to improve the stability of the latex and to improve the adhesive strength with the aggregate, Which is capable of enhancing durability by increasing elasticity, and a method of repairing and reinforcing concrete section by using the mortar.

According to another aspect of the present invention, there is provided a mortar for reinforcing and reinforcing a section of a concrete, comprising: a main portion including cement, aggregate, water-soluble latex and water; 6 to 12 parts by weight of a curing agent containing hexafluoroantimonate in the liquid type thermosetting epoxy resin based on 100 parts by weight of the main component; 1 to 3 parts by weight of inorganic particles selected from silica, alumina, zirconia, titanium oxide, zinc oxide, germanium oxide, indium oxide, tin oxide and mixtures thereof based on 100 parts by weight of the main component; And 5 to 15 parts by weight of a heat generating pellet which is produced by mixing and firing a ferromagnetic ferrite and a magnesium oxide-containing metal oxide powder based on 100 parts by weight of the main ingredient and generating heat by a high frequency magnetic field.

The method of the present invention for repairing and reinforcing a section of a concrete using the mortar of the present invention comprises the steps of: (a) chipping a section of a concrete structure requiring repair and reinforcement until the undamaged portion comes out; Applying a water repellent primer to the portion; (b) mixing and mixing the mortar for reinforcing concrete section reinforcement according to any one of claims 1 to 4 in the trimmed concrete section with water; (c) bringing a magnetic field generating device for generating a high-frequency magnetic field into proximity to the mortar for reinforcing the concrete section, thereby heating the mortar for reinforcing the concrete section; (d) curing for a predetermined time; (e) applying a finish coating material to the surface of the mortar for curing and repairing the cross section of the cured concrete.

Since the mortar for reinforcing concrete reinforced concrete of the present invention contains an epoxy resin curing agent that expands while being cured by heat, it is possible to minimize drying shrinkage after maintenance and reinforcement and improve the adhesion strength.

In addition, when the carboxyl end-butadiene copolymer and the silane coupling agent are introduced into the curing agent, the epoxy resin is rubber-modified to impart an elastic force, and the adhesion strength between the aggregate and the concrete section can be enhanced so that the mechanical strength and durability can be improved There is an effect.

FIG. 1 is a cross-sectional view showing a state where a section of a concrete structure is reinforced and reinforced by using a mortar for reinforcing a section of a concrete according to the present invention.
FIG. 2 is a flowchart illustrating a maintenance and repair method using mortar for repair and reinforcement according to the present invention.
FIG. 3 is a cross-sectional view showing another embodiment of a method for repairing and reinforcing a section of a concrete using mortar for reinforcing concrete sections according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a mortar for reinforcing concrete section and a method for repairing and reinforcing concrete section using the mortar according to the present invention will be described in detail.

The concrete reinforcing mortar according to the present invention comprises a main portion including cement, aggregate, water-soluble latex and water; A curing agent containing an epoxy resin and hexafluoroantimonate; Inorganic particles selected from silica, alumina, zirconia, titanium oxide, zinc oxide, germanium oxide, indium oxide, tin oxide and mixtures thereof; And a heating pellet which is produced by mixing and firing a ferromagnetic ferrite and a metal oxide powder containing magnesium and generating heat by a high frequency magnetic field.

The main portion is composed of 35 to 60% by weight of cement, 20 to 35% by weight of aggregate, 5 to 8% by weight of latex, and the balance water. The cement may be ordinary portland cement. The spacer may further include an aggregate. As the aggregate, fine aggregate composed of steel sand, silica sand, crushed sand, regenerated fine aggregate and the like is preferably used.

The water soluble latex is composed of a synthetic latex solids and water in a weight ratio of about 1: 1. In order to stabilize the water-soluble latex, the water-soluble latex may be prepared by further mixing a polyvinyl alcohol mono thiol. Preferably, the water-soluble latex is prepared by mixing 45 to 50% by weight of synthetic latex, 0.5 to 1% by weight of polyvinyl alcohol mono thiol, and the balance water.

Since the water-soluble latex is excellent in resistance to penetration of chlorine ions and the like, corrosion of reinforcing bars caused by penetration of chlorine ions or the like is suppressed. The water-soluble latex is preferably mixed in a proportion of 5 to 15% by weight based on the total weight of the main component.

The curing agent preferably comprises 6 to 12 parts by weight based on 100 parts by weight of the main component. The curing agent is composed of an epoxy resin containing hexafluoroantimonate or the like and has a property of being cured by heat and expanding.

Conventional water-soluble latex mortar (for example, Patent No. 10-1547895) uses a shrinkage reducing agent composed of a CSA-based expansion material and anhydrous gypsum (CaSO 4 ) to reduce the drying shrinkage of the repair-reinforced mortar, The reducing agent acts only to reduce the shrinkage of the mortar.

On the other hand, the curing agent contained in the repair-reinforcing mortar of the present invention is composed of a liquid-type thermosetting epoxy resin containing hexafluoroantimonate or the like and provides excellent adhesive strength and mechanical strength while expanding by a certain amount by heat. That is, the curing agent has properties of being excellent in adhesiveness and mechanical strength, which are properties of an epoxy resin, and having properties of being cured by heat and expanding without shrinking. Therefore, it is possible to provide excellent durability while preventing drying shrinkage of the repair reinforcing mortar.

The curing agent may include hexafluoroantimonate in order to have a property of being expanded upon curing by heat, and a carboxyl-terminated butadiene copolymer and a silane coupling agent may be added in order to increase the adhesion to the aggregate with high elasticity .

The curing agent is added with a butadiene copolymer of a carboxyl terminal (-COOH) of a bisphenol A type epoxy resin, which is a matrix (continuous), to strengthen the toughness of the epoxy resin, and a silane ) Coupling agent was carried out to increase the compressive strength and abrasion resistance. The curing agent to be applied to the repair-reinforcing mortar of the present invention is a curing agent which comprises 70 to 90% by weight of bisphenol A type epoxy resin, 2 to 4% by weight of hexafluoroantimonate, 3 to 15% by weight of carboxyl end- 5 to 12% by weight.

When hexafluoroantimonate of the above-mentioned curing agent is contained in an amount of less than 2% by weight, expansion force is remarkably lowered, and drying shrinkage is difficult to prevent. If it exceeds 4% by weight, the degree of expansion becomes remarkably large and the strength may be lowered.

If the content of the carboxyl-terminated butadiene copolymer is less than 5% by weight, the effect of increasing the elasticity is not expected. If the content of the carboxyl-terminated butadiene copolymer exceeds 15% by weight, the chemical resistance, solvent resistance and corrosion resistance may be deteriorated.

The silane coupling agent includes a reactor that reacts with an organic material and an alkoxy group that reacts with the inorganic material. The silane coupling agent is hydrolyzed and reacted with the water present on the aggregate surface and the cross-section of the concrete, Hydrogen bonding or chemical bonding between the hydroxyl group (-OH) present in the norborn group and the hydroxyl group of the aggregate surface can improve the adhesion on the aggregate surface and the concrete cross section.

If the content of the silane coupling agent is less than 5% by weight, adhesiveness, heat resistance and the like may be lowered. If the content is more than 12% by weight, the flowability of the mortar may be lowered.

The inorganic particles preferably include 1 to 3 parts by weight based on 100 parts by weight of the main component. The inorganic particles are preferably selected from silica, alumina, zirconia, titanium oxide, zinc oxide, germanium oxide, indium oxide, tin oxide, and mixtures thereof.

As described above, the curing agent has a characteristic of expanding upon curing by heat. To this end, the repair-reinforcing mortar of the present invention includes a heating pellet 4a (see FIG. 1) made by mixing and firing a ferromagnetic ferrite and a magnesium oxide-containing metal oxide powder. The heat generating pellet 4a comprises 75 to 95% by weight of ferromagnetic ferrite selected from the group consisting of magnetite (Re 3 O 4 ), lithium ferrite (LiFe 5 O 8 ) and magnesium ferrite (MgFe 2 O 4 ) and mixtures thereof; And 5 to 25% by weight of a metal oxide powder selected from the group consisting of magnesia, dolomite, magnesia clinker, magnesium carbonate, talc, and mixtures thereof.

When the high-frequency magnetic field is applied from the outside, the heat generating pellet 4a absorbs high frequency and generates heat at a temperature of approximately 60 to 110 ° C.

It is preferable that the heating pellets 4a contain 5 to 15 parts by weight based on 100 parts by weight of the main component. When the heating pellets 4a are less than 5 parts by weight, the amount of heat generated is so small that it is difficult to thermally cure the desired curing agent. If the exothermic pellets are more than 15 parts by weight, a problem arises in that the heat is generated more than necessary and the cost is increased.

The exothermic pellets 4a generate heat by a high frequency magnetic field to thermally cure the curing agent and also function as an aggregate to increase the mechanical strength of the repair and strengthening mortar.

1 and 2, the following description will be made of the method of reinforcing and reinforcing a section using the repair reinforcing mortar of the present invention.

The method of repairing and reinforcing the end face of a concrete using the repair reinforcing mortar according to the present invention comprises chipping the damaged part (2) of a concrete structure (1) requiring repair and reinforcement, polishing the part until an undamaged part comes out, Applying a primer (S1); (S2) mixing the concrete mortar for reinforcing concrete section (4) of the present invention with water in the damaged part (2) of the trimmed concrete section; A step S3 of bringing a magnetic field generating device (not shown) for generating a high-frequency magnetic field close to the mortar 4 installed in the damaged part 2 of the concrete section so as to heat the mortar 4 for reinforcing the concrete section ); Curing for a predetermined time (S4); And applying a finish coating material (S5) to the surface of the mortar for curing and repairing the cross section of the cured concrete.

In the step S1, the deteriorated portion of the concrete structure is seized by using a hand breaker, a water blast or the like until the undamaged portion comes out. At this time, when the reinforcing bars 3 of the concrete structure 1 are exposed to the outside, the rust of the reinforcing bar is removed by a sandblast or a brush, and the rust is removed by high pressure water to remove dust and foreign matter, and a water repellent primer is applied. At this time, an antirusting agent is applied to the reinforcing bar (3) as necessary to conduct rustproofing work.

When the repairing of the damaged portion 2 of the concrete section to be reinforced is completed, the repair and reinforcement mortar 4 of the present invention is mixed with water and the damaged portion 2 of the concrete section (Step S2).

When the magnetic field generating device for generating a high frequency magnetic field is brought close to the repairing reinforcing mortar 4 of the damaged part 2 of the repaired concrete section (step S3), the heat generating pellets 4a in the repairing reinforcing mortar 4 So that the curing agent is thermally cured and expands. It is possible to prevent the drying shrinkage by the expansion of the curing agent and to improve the adhesion strength.

After that, wet curing is performed for a certain period of time. Then, when the finish coat is applied to the surface of the mortar for the cured concrete section repair and reinforcement, the maintenance and reinforcement of the concrete section is completed.

On the other hand, if it is desired to reduce the amount of the heat-generating pellets used in the repair and reinforcement method, after the step S1, as shown in FIG. 3, the damaged portion 2 of the cross- Reinforcing mortar 4 is fixed by a wire or the like to the reinforcing bar 3 exposed to the outside of the damaged portion 2 of the concrete section and then a high frequency magnetic field The mesh net 5 generates heat, and the curing agent can be thermally cured by applying sufficient heat to the curing agent. The mesh net 5 also serves to increase the structural strength of the concrete section after the repair and reinforcement method.

As a result of performing a performance test on one embodiment of the repair reinforcing mortar of the present invention, it was found that it exhibited almost equal or slightly superior performance in terms of compressive strength and adhesive strength as compared with conventional latex modified concrete mortar.

≪ Example 1 >

45% by weight of crude steel Portland cement, 36% by weight of aggregate, 7% by weight of water-soluble latex and 12% by weight of water; 8 parts by weight of a curing agent consisting of 76% by weight of bisphenol A type epoxy resin, 2% by weight of hexafluoroantimonate, 12% by weight of a carboxyl end-butadiene copolymer and 10% by weight of a silane coupling agent based on 100 parts by weight of the main component, 1 part by weight of silica, and 12 parts by weight of exothermic pellets made of 82% by weight of magnetite (Re 3 O 4 ) and 18% by weight of dolomite were mixed to form maintenance reinforcing mortar, and 89% by weight of the repair reinforcing mortar and 11% Were charged into a mixer and mixed and stirred for 3 minutes to form a concrete for repair and reinforcement. Two hours after the concrete specimen for repair and reinforcement was formed, it was maintained at 5 kW for 20 minutes in a magnetic field of 100 kHz using a high frequency oscillator.

≪ Comparative Example 1 &

65 parts by weight of crude steel portland 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 were mixed and stirred to form a cement binder and 95 parts by weight of hydrophobic acrylic emulsion, 2 parts by weight of ethylene latex, 2 parts by weight of polystyrene acrylic ester latex, 0.5 part by weight of methacrylamide monomer and 0.5 part by weight of sodium persulphate as a reaction initiator were mixed and stirred to form a polymer admixture. 12.7 parts by weight of the cement binder, 46 parts by weight of the fine aggregate and 36 parts by weight of the coarse aggregate were charged in a mixer and stirred for 2 hours. Then, 2 parts by weight of water, 3 parts by weight of the polymer admixture and 90 parts by weight of nylon fibers and polyvinyl alcohol fibers And 0.3 parts by weight of a fiber reinforcing material, which is a weight ratio, were further mixed and stirred for 3 minutes to prepare a latex modified concrete composition.

≪ Test Example 1 >

The compressive strength test was conducted on the concrete for maintenance reinforcement of Example 1 and the latex modified concrete of Comparative Example 1 according to KS F 2405. The results of the measurement are shown in Table 1 below.

division Compressive strength (kgf / ㎠) After 4 hours After 12 hours After 24 hours After 7 days After 28 days Example 1 354 401 463 492 532 Comparative Example 1 358 399 455 489 528

≪ Test Example 2 &

The bending strength test was performed on the concrete for maintenance reinforcement of Example 1 and the latex modified concrete of Comparative Example 1 according to KS F 2408. The results of the measurement are shown in Table 2 below.

division Bending strength (kgf / ㎠) After 3 hours After 12 hours After 24 hours After 7 days After 28 days Example 1 68 73 82 86 95 Comparative Example 1 69 72 80 82 88

≪ Test Example 3 >

The adhesive strength test was performed on the concrete for maintenance reinforcement of Example 1 and the latex modified concrete composition of Comparative Example 1 on the basis of KS F 2762, and the measurement results are shown in Table 3 below.

division Adhesion strength (kgf / cm 2) After 3 hours After 12 hours After 24 hours After 7 days After 28 days Example 1 15 20 22 24 28 Comparative Example 1 17 19 20 23 26

<Test Example 4>

The shrinkage percentage of the concrete for repair and reinforcement of Example 1 and the latex modified concrete of Comparative Example 1 was measured according to KS F 2424, and the measurement results are shown in Table 4 below.

division Example 1 Comparative Example 1 Dry shrinkage (%) 0.08 0.12

As can be seen from the above Table 4, the drying shrinkage of the concrete for repair and reinforcement using the mortar of the present invention is smaller than that of the conventional concrete for repair and reinforcement, .

As described above, since the mortar for repairing reinforced concrete of the present invention contains an epoxy resin curing agent which expands while being cured by heat, it is possible to minimize drying shrinkage after maintenance and reinforcement and to improve the adhesion strength.

In addition, when the carboxyl end-butadiene copolymer and the silane coupling agent are carried on the curing agent, the epoxy resin is rubber-modified to impart an elastic force, and the adhesion strength between the aggregate and the concrete cross-section can be enhanced, thereby improving the mechanical strength and durability There is an effect.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the appended claims. And it is to be understood that such modified embodiments belong to the scope of protection of the present invention defined by the appended claims.

1: Concrete structure 2: Concrete section
3: Rebar 4: Repair mortar mortar
4a: heat generating pellet 5: mesh net

Claims (6)

delete A main part including cement, aggregate and water-soluble latex and water;
6 to 12 parts by weight of a curing agent containing hexafluoroantimonate in the liquid type thermosetting epoxy resin based on 100 parts by weight of the main component;
1 to 3 parts by weight of inorganic particles selected from silica, alumina, zirconia, titanium oxide, zinc oxide, germanium oxide, indium oxide, tin oxide and mixtures thereof based on 100 parts by weight of the main component;
And 5 to 15 parts by weight of a heat generating pellet which is produced by mixing and firing a ferromagnetic ferrite and a magnesium oxide-containing metal oxide powder based on 100 parts by weight of the main ingredient and generating heat by a high frequency magnetic field,
Wherein the curing agent comprises 70 to 90% by weight of a bisphenol A type epoxy resin, 2 to 4% by weight of hexafluoroantimonate, 3 to 15% by weight of a carboxyl end-butadiene copolymer and 5 to 12% by weight of a silane coupling agent Mortar for maintenance and reinforcement of concrete. 3. The method of claim 2, wherein the exothermic pellet comprises 75 to 95 wt% ferromagnetic ferrite selected from magnetite (Re 3 O 4 ), lithium ferrite (LiFe 5 O 8 ), magnesium ferrite (MgFe 2 O 4 ), and mixtures thereof; Wherein the mortar is made by mixing and firing 5 to 25% by weight of a metal oxide powder selected from the group consisting of magnesite, dolomite, magnesia clinker, magnesium carbonate, talc, and mixtures thereof. 3. The method of claim 2, wherein the water-soluble latex is formed by mixing 45 to 50% by weight of synthetic latex with 0.5 to 1% by weight of polyvinyl alcohol mono thiol and the balance water. Mortar. (a) chipping a damaged portion of a section of a concrete structure that requires repair or reinforcement to polish the damaged portion until the damaged portion is exposed, and applying a water repellent primer to the damaged portion;
(b) mixing the concrete section repair reinforcing mortar according to any one of claims 2 to 4 with water in a damaged part of the trimmed concrete section;
(c) bringing a magnetic field generating device for generating a high-frequency magnetic field into proximity to the mortar for reinforcing the concrete section, thereby heating the mortar for reinforcing the concrete section;
(d) curing for a predetermined time;
(e) applying a finish coating material to the surface of the cured mortar for curing and repairing the section of the concrete. The method of claim 5, further comprising the step of fixing a mesh net made of ferromagnetic ferrite to the reinforcing bars exposed to the outside of the concrete section, the reinforcing bars being exposed to the outside of the concrete section after the step (a) A method of repairing and reinforcing a concrete section.
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