KR101700133B1 - Mortar composition for repairing and reinforcing concrete structures, and method of repairing and reinforcing concrete structures using the same - Google Patents
Mortar composition for repairing and reinforcing concrete structures, and method of repairing and reinforcing concrete structures using the same Download PDFInfo
- Publication number
- KR101700133B1 KR101700133B1 KR1020160008853A KR20160008853A KR101700133B1 KR 101700133 B1 KR101700133 B1 KR 101700133B1 KR 1020160008853 A KR1020160008853 A KR 1020160008853A KR 20160008853 A KR20160008853 A KR 20160008853A KR 101700133 B1 KR101700133 B1 KR 101700133B1
- Authority
- KR
- South Korea
- Prior art keywords
- weight
- parts
- reinforcing
- repairing
- concrete structure
- Prior art date
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- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
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Classifications
-
- 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
-
- 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
- C04B41/4596—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 fibrous materials or whiskers
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/4598—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with waste materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/47—Oils, fats or waxes natural resins
- C04B41/474—Natural resins, e.g. rosin
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/48—Macromolecular compounds
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/0034—Maintenance, repair or inspection of offshore constructions
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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- Engineering & Computer Science (AREA)
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- Materials Engineering (AREA)
- Civil Engineering (AREA)
- Architecture (AREA)
- General Engineering & Computer Science (AREA)
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- Geochemistry & Mineralogy (AREA)
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- Environmental & Geological Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
The present invention relates to a mortar composition for repairing and reinforcing a concrete structure and a method of repairing and reinforcing a concrete structure using the mortar composition. More particularly, the present invention relates to a mortar composition for repairing and reinforcing a damaged structure of a deteriorated concrete structure, A mortar composition for repairing and reinforcing concrete structures having excellent properties such as excellent economical efficiency, excellent usability, and excellent resistance to freezing and thawing since it can be used for a long period of time and can be completed in a short time in a stable manner, And a method for repairing and reinforcing concrete structures using the same.
Reinforced concrete structures are deteriorated in durability and usability in the long term due to deterioration of structures due to salt corrosion, neutralization, alkali aggregate reaction, chemical corrosion as well as corrosion expansion of steel due to penetration of water. As the deterioration of these structures continues, there is a risk that the structure will collapse, so it is necessary to constantly repair and maintain the structures.
Since the detachment of the structure surface or the occurrence of initial defects or cracks facilitates the movement of deterioration factors and promotes the progress of deterioration, it is necessary to repair and reinforce the deterioration progress at the initial stage of deterioration in order to secure the stability and performance of the reinforced concrete structure And it is necessary to improve the durability performance.
Therefore, in order to restore the section to its original performance and shape after removing the concrete part including deterioration factors such as deterioration factor of deterioration such as deterioration of concrete, corrosion of steel and other factors, It is general to carry out repair by construction.
On the other hand, in order to reinforce concrete structures, properties such as durability, adhesive strength and quick-setting properties of the mortar composition for repair and reinforcement are required, and economical problems of materials are also important factors.
The present inventors have proposed a mortar composition for repairing and reinforcing a concrete structure and a repairing and reinforcing method of a concrete structure using the mortar composition by using a pre-registered patent (Korean Patent No. 10-0999354). In this patent, using the artificial marble waste powder, the cement sludge, the phosphorus-containing gypsum or the flue gas desulphurization cement, and using the cement cement and the alpha type semicircular gypsum, the shrinkage expansion rate is lowered and the rapid hardening of the product is induced. And concrete mortar for repair and reinforcement of concrete structures.
In addition, it is possible to maintain high physical properties such as bending strength, tensile strength and compressive strength in repairing and reinforcing a damaged concrete structure through another pre-registered patent (Korean Patent No. 10-1528120) It is excellent in chemical resistance and waterproofing property. It is also excellent in resistance against salting and shielding against radioactivity. Especially, it does not harden even when stored for a long time, so it is excellent in storage stability and each component is separated. Therefore, there has been proposed a method for repairing and reinforcing a concrete structure using a concrete structure maintenance reinforcing agent having properties that can be used on the site without being limited in terms of use, convenient in use, and capable of preventing material loss and environmental pollution. However, the mortar composition proposed in this patent is excellent in quick-hardness, workability, and economy, but needs further supplementation in terms of adhesion strength and durability to the concrete surface to be applied, and in particular, resistance to freezing and thawing is somewhat lacking There was a need to improve this.
The present invention has been developed in order to overcome the limitations of the conventional techniques as described above, and it is an object of the present invention to provide a method for repairing and reinforcing a damaged concrete structure in which physical properties such as bending strength, tensile strength and compressive strength can be maintained high, And is excellent in workability and usability, has an advantage of securing initial strength, and is excellent in long-term durability because of excellent resistance to freezing and thawing and salt corrosion, A mortar composition for repairing and reinforcing a concrete structure having properties that can be used in the field without any problem of limited period of use because it is used immediately before use, and is capable of preventing material loss and environmental pollution, and To provide repair method of reinforced concrete structure The.
As a means for solving the above-mentioned problems,
A. Preparation of a concrete structure section repair agent composition, wherein said concrete structure section repair agent composition comprises
(1) 50 to 100 parts by weight of cement, 0.5 to 10 parts by weight of clinker, 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of alpha type hemihydrate, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, 10 to 70% by weight of a first powder component comprising 0.5 to 10 parts by weight of limestone, 1 to 20 parts by weight of blast furnace slag, 0.01 to 10 parts by weight of calcined pozzolan and 0.01 to 10 parts by weight of microsilica; 0.05 to 0.2 parts by weight of a viscosity enhancer, 0.3 to 1.1 parts by weight of a fluidizing agent, 0.5 to 1.0 part by weight of a curing accelerator, 0.1 to 0.4 part by weight of a retarding agent, 2 to 7 parts by weight of a siliceous waterproofing agent, 5 to 10 parts by weight of a CSA- And 42 to 64 parts by weight of silica sand and 30 to 90% by weight of a second powder component comprising 100 parts by weight of the powder component.
(2) One or more powder or liquid rubber selected from ethylene-vinyl acetate (EVA) resin, NR (natural rubber) resin, NBR (natural rubber-butadiene rubber) resin and SBR 1 to 20 parts by weight of a modified latex component obtained by mixing a resin with cement-like quick-setting cement, carbon black and fibers;
(3) 1 to 7 parts by weight of methyl methacrylate, 5 to 20 parts by weight of styrene monomer, 1 to 10 parts by weight of n-butyl acrylate, 0.1 to 10 parts by weight of methyl acrylate, 0.1 to 10 parts by weight of isobornyl acrylate, 0.05 to 5 parts by weight of an initiator and 0.05 to 5 parts by weight of an emulsifier;
(4) 1 to 10 parts by weight of a hydrophilic polyvinyl alcohol short fiber component; And
(5) 1 to 5 parts by weight of an additive component comprising a mixture of a preservative, an antifoaming agent and a humectant;
B. 100 to 200 parts by weight of a filler and 100 to 250 parts by weight of an aggregate based on 100 parts by weight of the above-mentioned concrete cross-sectional repair filler composition are mixed with water to prepare a mortar composition for reinforcing a concrete structure;
C. Chipping the work surface of the damaged concrete structure and finishing the section until an undamaged portion is obtained; And
D. applying and curing the mortar composition for reinforcing the section of the concrete structure obtained in the step B to the trimmed surface to be applied;
The present invention provides a method of repairing and reinforcing a concrete structure.
In one embodiment of the present invention, the mixture of 100 parts by weight of the natural pozzolana of the above (1) and 1 to 20 parts by weight of calcium is calcined at 1000 to 1200 ° C. for 0.5 to 1 hour, Is 10 to 20 占 퐉.
In one embodiment of the present invention, the method further includes a step of applying a primer to the trimmed surface to be applied prior to applying the mortar composition for reinforcing a section of the concrete structure in the step (D).
In one embodiment of the present invention, when applying the mortar composition for repairing and reinforcing concrete structures in step D, spray or trowel is used to apply 5 to 15 mm for primary casting, 20 to 50 mm for secondary and tertiary casting, It is characterized in that it is applied and plastered with a thickness of 5 ~ 15 mm at the time of final casting.
In one embodiment of the present invention, the step (D) further comprises a step of applying the coating agent after the mortar composition for reinforcing and reinforcing concrete structures is coated and cured.
In one embodiment of the present invention, the coating agent comprises 10 to 50 wt% of an epoxy resin, 5 to 40 wt% of a polymethyl methacrylate resin, 1 to 25 wt% of a diluent, 0.1 to 15 wt% of a flocculant, 1 to 20% by weight of a water-soluble oil, 1 to 10% by weight of an emulsifier, 0.1 to 5% by weight of a water-soluble oil, 5 to 20% by weight of an accelerator, and 50 to 90% by weight of water to prepare an aqueous solution, mixing 5 to 50 parts by weight of a polyamide and 0.1 to 40 parts by weight of an amine compound based on 100 parts by weight of the obtained aqueous solution, Based on the total weight of the epoxy resin composition.
According to the present invention, an acrylic mixed resin is used for repairing and reinforcing a damaged part of a deteriorated concrete structure, and in particular, a clinker, a plaster, an alpha-type hemihydrate gypsum, a silica cauffer, fly ash, limestone, blast furnace slag, calcined pozzolan, It has excellent physical properties such as bending strength, tensile strength and compressive strength by including powder component including micro silica, has excellent adhesion with concrete structure, excellent chemical resistance and waterproofing property, resistance to freezing and thawing And it is possible to improve the curing speed of the mortar and increase the waterproof effect by using powder components such as a siliceous waterproofing agent, a CSA-based swelling agent and a fluidizing agent. In addition, the effect of improving the initial strength can be drastically increased by including the modified latex rubber type resin component. Further, by using the monomer component, the initiator component and the emulsifier, the internal structure is further densified and the physical properties are further enhanced. It is possible to remarkably shorten the working time since the initial strength can be ensured after application, and the resistance to freezing and thawing and salting of the concrete structure is drastically improved, so that the maintenance and reinforcement effect can be maintained for a long time.
Hereinafter, the present invention will be described in detail.
The repair and reinforcement method of a concrete structure according to the present invention
Proceed in the following order. In other words,
A. preparing a concrete structure resurfacing composition;
B. 100 to 200 parts by weight of a filler and 100 to 250 parts by weight of an aggregate based on 100 parts by weight of the above-mentioned concrete cross-sectional repair filler composition are mixed with water to prepare a mortar composition for reinforcing a concrete structure;
C. Chipping the work surface of the damaged concrete structure and finishing the section until an undamaged portion is obtained; And
D. applying and curing the mortar composition for reinforcing the section of the concrete structure obtained in the step B to the trimmed surface to be applied;
First, in the step A, the repair composition for a section of a concrete structure comprises the following six components. In other words,
(1) 50 to 100 parts by weight of cement, 0.5 to 10 parts by weight of clinker, 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of alpha type hemihydrate, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, 10 to 70% by weight of a first powder component comprising 0.5 to 10 parts by weight of limestone, 1 to 20 parts by weight of blast furnace slag, 0.01 to 10 parts by weight of calcined pozzolan and 0.01 to 10 parts by weight of microsilica; 0.05 to 0.2 parts by weight of a viscosity enhancer; 0.3 to 1.1 parts by weight of a fluidizing agent; 0.05 to 0.3 parts by weight of a curing accelerator; 0.1 to 0.4 parts by weight of a retarding agent; 2 to 7 parts by weight of a siliceous waterproofing agent; 1.5 to 3 parts by weight of a CSA- And 42 to 64 parts by weight of silica sand and 30 to 90% by weight of a second powder component comprising 100 parts by weight of the powder component.
(2) One or more powder or liquid rubber selected from ethylene-vinyl acetate (EVA) resin, NR (natural rubber) resin, NBR (natural rubber-butadiene rubber) resin and SBR 1 to 20 parts by weight of a modified latex component obtained by mixing a resin with cement-like quick-setting cement, carbon black and fibers;
(3) 1 to 7 parts by weight of methyl methacrylate, 5 to 20 parts by weight of styrene monomer, 1 to 10 parts by weight of n-butyl acrylate, 0.1 to 10 parts by weight of methyl acrylate, 0.1 to 10 parts by weight of isobornyl acrylate, 0.05 to 5 parts by weight of an initiator and 0.05 to 5 parts by weight of an emulsifier;
(4) 1 to 10 parts by weight of a hydrophilic polyvinyl alcohol short fiber component; And
(5) 1 to 5 parts by weight of an additive component comprising a mixture of a preservative, an antifoaming agent and a humectant;
.
Hereinafter, the main components of the composition will be described in detail.
First, in the present invention, the powder component is a mixture of a first powder component and a second powder component, wherein the first powder component is a component serving as a binder and the second powder component is a component . ≪ / RTI >
The cement contained in the first powder component of the powder component according to the present invention is formed so as to increase strength such as initial compressive strength, flexural strength, adhesive strength, and shorten the curing time. Specifically, the above-mentioned cement component may be a general portland cement, or may be a mixture of a quick-speed cement, an alumina cement, an awwin cement, and the like.
In the present invention, the clinker contained in the first powder component of the powder component is composed of calcium silicate, alite, berylite, celite and the like. The clinker serves to promote the mixing of the binder and water. If the content of the clinker is less than 0.5 parts by weight, mixing of the binder and water is not easy. When the amount of the clinker is more than 10 parts by weight, the content of the clinker is preferably in the range of 0.5 to 10 parts by weight, There is a problem that the strength is lowered.
In addition, in the present invention, the plaster included in the first powder component of the powder component serves to easily mix the components contained in the binder with water. When the content of the plaster is less than 0.5 parts by weight, the various components contained in the binder are easily mixed with water. There is a difficult problem, and when it exceeds 10 parts by weight, the strength and chemical resistance are deteriorated.
Further, in the present invention, the alpha-hemihydrate gypsum contained in the first powder component of the powder component is obtained by heating the alumina solu- tion at a temperature of about 75 to 100 ° C under a reduced pressure of not less than -600 torr for not less than 1 hour, The alpha type hemihydrate gypsum is produced by heating with alpha type hemihydrate gypsum. When the alpha type hemihydrate gypsum is mixed with cement, the shrinkage expansion rate is almost zero, and cracks due to shrinkage expansion are suppressed. More specifically, in general, gypsum is largely divided into natural gypsum and chemical gypsum. The purity is determined according to the content of SO 3 , and the gypsum gypsum is divided into the gypsum gypsum, half gypsum and anhydrous gypsum do. It is transformed into alpha type, beta type or anhydrous gypsum depending on the dehydration condition. It is transformed into beta type when dehydrated in a dry state, and alpha type when dehydrated in a wet state. Alpha-type hemihydrate gypsum has more than 10 times more strength than beta-type hemihydrate gypsum, has a short initial curing time, and has the effect of suppressing cracks due to expansion and shrinkage. In addition, the alpha-type hemihydrate gypsum plays a role of strengthening the high strength, quickness and expandability together with the CSA type expanding agent described later, and it plays a role of supplementing the disadvantage of the CSA type expanding agent.
In the present invention, it is preferable that the alpha-hemihydrate gypsum is contained in the first powder component in the range of 0.5 to 10 parts by weight. When the content of the alpha-hemihydrate gypsum is less than 0.5 part by weight, If the amount is more than 10 parts by weight, the reaction speed is increased and the pot life is shortened.
In the present invention, the silica fume contained in the first powder component of the powder component is an amorphous active silica having an average particle diameter of about 0.15 mu m and is a nearly spherical particle. Silica fume improves the water resistance and chemical resistance by filling effect between binder particles due to the characteristics of spherical particles, and enhances the strength of the maintenance reinforcing agent. Particularly, silica fume also plays a role in improving the adhesion performance of the maintenance reinforcing agent. It is preferable that the silica fume is contained in the first powder component in the range of 0.1 part by weight to 5 parts by weight. When the content of the silica fume is less than 0.1 part by weight, water repellency and chemical resistance of the maintenance reinforcing agent are lowered, There is a problem in that if it exceeds 5 parts by weight, cracks may occur.
In addition, the fly ash contained in the first powder component of the powder component in the present invention (fly ash) is silicon burning coal in facilities that use coal-fired power plants the fuel remaining components remain in the oxide form oxide (SiO 2 ) Or aluminum oxide (Al 2 O 3 ) component. When the fly ash is mixed with concrete, workability is improved, curing heat is lowered, and long-term strength and water tightness are improved, which is economical. It is preferable that the fly ash is contained in the first powder component in the range of 0.01 to 5 parts by weight. When the content of the fly ash is less than 0.01, the performance of the maintenance reinforcing agent is deteriorated. When the fly ash is more than 5 parts by weight There is a problem that the chemical resistance is deteriorated.
In addition, the limestone contained in the first powder component of the powder component in the present invention plays a role in additionally enhancing the adhesion of the repair or reinforcing agent according to the present invention. It is preferable that the limestone is contained in the first powder component in the range of 0.5 to 10 parts by weight. If the content of the limestone is less than 0.5 part by weight, the improvement effect of the adhesion of the maintenance reinforcing agent is deteriorated, There is a problem that the chemical resistance is deteriorated.
In the present invention, the blast furnace slag included in the first powder component of the powder component is a by-product generated in the process of manufacturing steel in an ironworks or the like. The main component of the blast furnace slag is alumina silicate. When the blast furnace slag is mixed with the binder, And serves to enhance the durability and chemical resistance of the maintenance reinforcing agent. In particular, the blast furnace slag has a low water permeability and serves to improve the water resistance of the repair or reinforcement according to the present invention, and to improve the resistance to freezing and thawing and salting. It is preferable that the blast furnace slag is contained in the first powder component in a range of 1 to 20 parts by weight. When the content of the slag is less than 1 part by weight, the durability, chemical resistance, water resistance, There is a problem that the salt resistance is deteriorated. When the amount exceeds 20 parts by weight, cracks of the maintenance reinforcing agent may occur and the weight of the maintenance reinforcing agent may increase.
In the present invention, the calcined pozzolana contained in the first powder component of the powder component is prepared by adding calcium to natural pozzolana, which is mainly composed of fine red, volatile acid earth, To improve the water resistance of the repair or reinforcement according to the present invention. Specifically, a mixture obtained by mixing 100 parts by weight of natural povolacne with 1 to 20 parts by weight of calcium is calcined at 1000 to 1200 ° C. for 0.5 to 1 hour and then pulverized to have an average particle size of 10 to 20 μm . When the above-mentioned treated soapollane is applied to the mortar, it enhances the denseness of the tissue to increase water resistance and strength. It is preferable that the lower phospololane is contained in the first powder component in the range of 0.01 to 10 parts by weight. When the content of the lower phospololane is less than 0.01 part by weight, the water repellency of the maintenance reinforcing agent is lowered, and 10 parts by weight There is a problem that the strength of the maintenance reinforcing agent is lowered.
In the present invention, the microsilica contained in the first powder component of the powder component is a silica particle having a particle diameter of 10 to 200 탆 and serves to improve the strength and chemical resistance of the repair agent according to the present invention. If the content of the microsilica is less than 0.01 part by weight, the strength and chemical resistance of the repair improver may be deteriorated. If the content of the microsilica is less than 10 parts by weight, There is a problem that the adhesion performance of the maintenance reinforcing agent is deteriorated.
In the present invention, the second powder component of the powder component is used for minimizing side effects and improving the performance when the first powder component is used.
In the present invention, the siliceous waterproofing agent contained in the second powder component of the powder component improves the waterproofing property by chemically and physically filling the pores of the cemented product and making it densified. If the amount of the siliceous waterproofing agent is less than 2 parts by weight, the waterproof effect is insignificant. When the amount of the silicate-based waterproofing agent is more than 7 parts by weight, So that the physical properties are reduced.
In the present invention, it is preferable that the CSA (Calcium sulphoaluminate) based expander contained in the second powder component of the powder component is included in the second powder component in the range of 5 to 10 parts by weight. If the content of the CSA-based expanding agent is less than 5 parts by weight, the effect of shrinkage reduction is insignificant. If the amount exceeds 10 parts by weight, expansion may occur and the cured body may be broken, and physical properties such as strength may be deteriorated.
In the present invention, the viscosity enhancer contained in the second powder component of the powder component may be a cellulose-based thickener, a starch-based thickener, or the like. In the present invention, the viscosity enhancer is preferably included in the second powder component in the range of 0.05 to 0.2 part by weight. If the amount is less than 0.05 part by weight, separation of the material may occur. If the amount is more than 0.2 part by weight, And the construction quality may be deteriorated.
In the present invention, the fluidizing agent contained in the second powder component of the powder component may be a fluidizing agent such as naphthalene-based, melamine-based, polycarboxylic-based or the like. In the present invention, it is preferable that the fluidizing agent is contained in the second powder component in the range of 0.3-1.1 parts by weight. If the content is less than 0.3 parts by weight, the effect of lowering the viscosity can not be exhibited. If the content is more than 1.1 parts by weight Problems such as material separation and bleeding may occur.
In the present invention, the curing accelerator contained in the second powder component of the powder component may be an inorganic curing accelerator such as a chloride, an alkali carbonate or an alkali aluminate such as CaCl 2 , Na 2 CO 3 , Al (OH) 3 or NaAlO 2 And the curing accelerator is preferably included in the second powder component in the range of 0.05 to 1.0 part by weight.
In the present invention, the retarder contained in the second powder component of the powder component has a function of suppressing the formation of cement hydrate and freely adjusts the curing time, and it is possible to use tartaric acid, gluconic acid, citric acid, . In the present invention, it is preferable that the retarder is contained in the range of 0.1 to 0.4 parts by weight in the second powder component.
The silica powder included in the second powder component of the powder component of the present invention is preferably included in the range of 42 to 64 parts by weight in consideration of the specific gravity of the composition.
In the present invention, the first powder component and the second powder component obtained by the above composition are mixed in the range of 10 to 70% by weight and 30 to 90% by weight, respectively, to form a powder component.
In the present invention, the modified latex component (2) is prepared by modifying a powdery or liquid latex rubber resin. The latex rubber resin preferably used in the present invention is one selected from ethylene-vinyl acetate (EVA) resin, NR (natural rubber) resin, NBR (natural rubber-butadiene rubber) resin and SBR It is preferable to use a powdery or liquid polymer resin composed of two or more kinds of resin mixtures. In the present invention, the latex-based rubber resin exhibits an increase in fluidity, an increase in working time (working time) and an improvement in workability in a state before curing of mortar, and an increase in surface adhesion force, an increase in cohesive force, an increase in bending strength, And the like. In the present invention, the latex rubber resin is used by mixing a certain amount of ultra fast cement, carbon black and fibers in the powdery liquid rubber resin. In the present invention, the quick-speed cement can be used with an ultra-fast vulcanized cement such as Awun, and it strengthens the compressive strength when it is mixed with the latex rubber resin.
Also, in the present invention, the carbon black serves to improve the long-term compressive strength when it is mixed with the latex rubber resin.
In addition, when the fibers are mixed with a latex-based rubber resin, they improve bending strength and tensile strength. In the present invention, the fibers may be natural fibers such as cellulose, or synthetic fibers such as nylon and polyester.
In the present invention, the mixing ratio of the powder or the liquid rubber resin constituting the modified latex component to the ultra fast cement, the carbon black and the fiber is preferably 100: 1 to 20: 0.1 to 10: 0.1 to 10 by weight.
In the present invention, the modified latex component (2) is preferably used in an amount of 1 to 20 parts by weight based on 100 parts by weight of the powder component (1). If the modified latex component (2) is used in an amount of less than 1 part by weight, it is difficult to expect an increase in performance. If the modified latex component is used in an amount exceeding 20 parts by weight, the production of etyne zite may be inhibited.
In the present invention, the liquid component (3) comprises 1 to 7 parts by weight of methyl methacrylate, 5 to 20 parts by weight of styrene monomer, 1 to 10 parts by weight of n-butyl acrylate, 0.1 to 10 parts by weight of methyl acrylate, 0.05 to 5 parts by weight of an initiator, and 0.05 to 5 parts by weight of an emulsifier.
In the present invention, the monomer component constituting the liquid component comprises methyl methacrylate, styrene monomer, n-butyl acrylate, methyl acrylate and isobornyl acrylate, wherein the initiator and the emulsifier are mixed.
Specifically, the methyl methacrylate (MMA) serves to enhance the viscosity and adhesion of the repair or reinforcing agent according to the present invention. It is preferable that the methyl methacrylate is included in the liquid component in the range of 1 to 7 parts by weight. When the methyl methacrylate is contained in an amount of less than 1 part by weight, the viscosity of the maintenance reinforcing agent is lowered, When the amount of the acrylic emulsion resin is more than 7 parts by weight, the acrylic emulsion resin can not be easily mixed with the long fibers and the binder due to the excessive viscosity. Accordingly, there is a problem that the dispersibility of the acrylic emulsion resin is deteriorated. There arises a problem that the workability is lowered.
The styrene monomer is polymerized in the form of a polymer by an initiator and promotes hardening of the repair agent according to the present invention and increases the strength. When the styrene monomer is contained in an amount of less than 5 parts by weight, the curing rate of the curing agent is lowered, and the strength of the cured curing agent is lowered If it exceeds 20 parts by weight, it is included more than necessary, which is not economical.
The n-butyl acrylate serves to improve the adhesion performance of the maintenance reinforcing agent according to the present invention. When the amount of the n-butyl acrylate is less than 1 part by weight, the adherence of the maintenance reinforcing agent is deteriorated. When the amount of the n-butyl acrylate is more than 10 parts by weight It is not economical.
The methyl acrylate serves to improve the adhesion performance and strength of the repair or reinforcing agent according to the present invention. When methyl acrylate is contained in an amount of less than 0.1 part by weight, the adhesion performance and strength characteristics are deteriorated. When the amount of methyl acrylate is more than 10 parts by weight The case is less economical.
The isobornyl acrylate serves to improve the dispersibility of the components contained in the repair or reinforcing agent according to the present invention. When the isobornyl acrylate is contained in an amount of less than 0.1 part by weight, the dispersibility of various components is lowered, so that the uniformity of the maintenance reinforcing agent There is a problem that it is difficult to obtain a physical property. When the amount exceeds 10 parts by weight, the addition amount of other components is limited, and it is difficult to obtain excellent strength and adhesion performance of the maintenance reinforcing agent.
The present invention includes an initiator and an emulsifier in addition to the monomer component constituted as described above.
In the present invention, the initiator serves to initiate the polymerization reaction of the monomer component. Examples of the initiator include t-butyl peroxybenzoate, benzoyl peroxide, methyl ethyl ketone peroxide, cumene hydroperoxide, t-butyl Asecape, or 2,5-dimethylhexyl-2,5-diperoxybenzoate, and the like can be used. In the present invention, it is preferable that the initiator is used in the range of 0.05 to 5.0 parts by weight based on the liquid component. When the content of the initiator is less than 0.05 part by weight, the polymerization initiating reaction of the monomer is lowered, When the amount is more than 5.0 parts by weight, it is difficult to control the polymerization reaction efficiently.
In the present invention, the emulsifier serves to easily mix the maintenance reinforcing agent with water when water is added to the maintenance reinforcing agent according to the present invention. As the emulsifier in the present invention, a glycerin fatty acid ester, a sorbitan fatty acid ester, or a polyglycerin fatty acid ester may be used. In the present invention, it is preferable that the emulsifier is used in the range of 0.05 to 5.0 parts by weight based on the liquid component. When the content of the emulsifier is less than 0.05 part by weight, the maintenance reinforcing agent may not easily mix with water If the amount is more than 5 parts by weight, there is a problem that the strength and adhesion performance of the maintenance reinforcing agent is difficult to be exerted.
In the present invention, the hydrophilic polyvinyl alcohol short fiber component of (4) has a very high resistance to carbon-containing solvent, oil, salt and alkali, and has excellent resistance even when exposed to direct sunlight. In addition, the hydrophilic structure having hydroxyl group on the fiber surface is well dispersed in the liquid phase, has high elastic modulus and excellent adhesion to powder components, has a relatively small diameter to suppress and stabilize microcracks, It is very effective in increasing mechanical properties and is effective in suppressing cracks caused by fatigue and impact load.
The hydrophilic polyvinyl alcohol short fibers used in the present invention preferably have a specific gravity of 1.1 to 1.3 g / cm 3, a diameter of 9 to 12 탆, a tensile strength of 7000 to 9000 kgf / cm 2 and a length of 3 to 8 mm, It is preferably used in a range of about 1 to 10 parts by weight based on 100 parts by weight of the component. If the content of the hydrophilic polyvinyl alcohol short fiber is less than 1 part by weight, it is not effective to suppress plastic cracking, and if it exceeds 10 parts by weight, entanglement of fibers may occur.
In the present invention, as the additive component (5), it is preferable to mix a mixture of an antiseptic, antifoaming agent and wetting agent in an appropriate ratio.
In the present invention, the preservative is used to prevent fungi or bacteria from living. In order to suppress bubbles during the mixing of the liquid component and the powder component, a defoaming agent is used. Specifically, a mineral oil defoaming agent can be used . In addition, the wetting agent may be a low viscosity wetting agent as a surfactant for uniform mixing of the liquid component and the powder component.
In the present invention, the specific mixing ratio of the additive component is not particularly limited. For example, a preservative, a defoaming agent, and a wetting agent may be mixed in a weight ratio of 1: 10: 1 to 10: 1 to 10.
In the present invention, the additive component (5) is preferably used in an amount of about 1 to 5 parts by weight based on 100 parts by weight of the powder component.
The composition of the concrete structure maintenance and reinforcing agent obtained by the above composition exists in a state in which the liquid component and the powder component are separated from each other, and the filler and the aggregate and water are mixed immediately before use to constitute a mortar composition for repairing and reinforcing concrete structures.
Specifically, the mortar composition for repairing and reinforcing a concrete structure according to the present invention comprises 100 parts by weight of a concrete structure repair or reinforcement composition obtained by the composition of the present invention, 100 to 200 parts by weight of a filler, and 100 to 250 parts by weight of an aggregate .
In the present invention, the filler may be at least one selected from limestone, abrasive, and talc. The amount of the reinforcing agent is preferably in the range of 100 to 200 parts by weight based on 100 parts by weight of the concrete structure reinforcing agent composition. If the amount is less than 100 parts by weight, the effect of suppressing the shrinkage of the mortar cured product may be insignificant and the amount of drying shrinkage may increase. If the amount exceeds 200 parts by weight, the amount of filler may be excessive and the fluidity and workability may be deteriorated.
The aggregate is preferably silica sand, and silica sand having a particle size of 0.2 to 2.5 mm is suitable for producing a mortar having good adhesion without being separated from water. It is preferable that the aggregate has a ratio of 100 to 250 parts by weight based on 100 parts by weight of the concrete structure reinforcing agent composition in consideration of workability for mortar.
The mortar composition may further comprise at least one additive selected from 0.1 to 10 parts by weight of a dispersant, 0.01 to 3 parts by weight of an antifoamer and 0.01 to 10 parts by weight of a retarder, if necessary.
When the mortar composition for repairing and reinforcing concrete structures according to the present invention is prepared, the surface of the damaged concrete structure is chipped and the surface or cross section of the damaged concrete structure is polished until the damaged portion is removed. The mortar composition for repair and reinforcement is applied and cured.
That is, the step of chipping the damaged concrete section or spraying the washing water to remove the deteriorated part is trimmed.
Then, mortar for repairing and reinforcing concrete structures according to the present invention is installed and cured on the cross section of the refined concrete structure.
In the present invention, when applying the mortar composition for repairing and reinforcing concrete structures, spray or trowel is used to apply 5 to 15 mm for primary casting, 20 to 50 mm for secondary and tertiary casting, and 5 to 15 mm for final casting And the like.
In the present invention, before applying the mortar composition for repairing and reinforcing concrete structures, the method may further include coating a primer (primer) on the surface to be polished. In the present invention, the primer may be a generally used primer. By using a primer, the adhesion of the primer to the concrete surface to be applied can be further strengthened, and the construction can proceed more efficiently.
Thereafter, the repair and reinforcement work may be completed by further including a step of applying the coating agent after the mortar composition for repairing and reinforcing concrete structures according to the present invention is applied and cured.
In the present invention, as the coating agent, it is preferable to use an aqueous coating agent composed of a main component and a curing agent component.
More specifically, in the present invention, the coating agent may contain 10 to 50 wt% of an epoxy resin, 5 to 40 wt% of a polymethyl methacrylate resin, 1 to 25 wt% of a diluent, 0.1 to 15 wt% of a flocculant, 1 to 20 wt% of an inorganic filler 1 to 20% by weight of a water-soluble oil, 1 to 10% by weight of an emulsifier, 1 to 10% by weight of an emulsifier, 0.1 to 5% by weight of an accelerator, 0.05 to 20% by weight of an emulsifier and 10 to 80% 5 to 20% by weight of water and 50 to 90% by weight of water are mixed to prepare an aqueous solution. 5 to 50 parts by weight of a polyamide and 0.1 to 40 parts by weight of an amine compound are mixed with 100 parts by weight of the obtained aqueous solution to obtain a curing agent component By weight to 50 parts by weight of an epoxy coating agent.
At this time, the epoxy resin used in the present invention may be a commonly used epoxy resin, and general epoxy resin, chlorine-containing epoxy resin, novolac epoxy resin, brominated epoxy resin or a mixture thereof may be used.
In addition, the polymethylmethacrylate (PMMA) resin in the present invention enhances the weather resistance of the epoxy resin composition and smoothly accelerates curing and drying. In the present invention, the polymethyl methacrylate resin preferably has a weight average molecular weight in the range of 10,000 to 300,000.
In the present invention, n-butyl glycidyl ether may be used as the reactive diluent.
In the present invention, the coagulant may be silicon dioxide, aerosil, bentonite nanoparticles, silica nanoparticles or the like.
In the present invention, the inorganic filler may be at least one selected from the group consisting of powders of calcium carbonate, talc, heavy carbon, ceramics, clay, silica and dolomite.
In the present invention, the promoter may be phenol.
In the present invention, the emulsifier may be a copolymer of polyoxyethylene and polyoxypropylene.
The polyamide preferably has a weight average molecular weight of 1,000 to 5,000, more preferably 1,000 to 4,000.
In the present invention, the amine compound may be polyoxypropylene diamine.
In the present invention, the water-soluble oil used for preparing the aqueous hardener component may be a silicone oil or an acetate oil.
In the present invention, the host component is cured by the curing agent component to increase cross-linking, and has a good curing property by bringing about the activation of the gravitational force by the gradual rate control in the curing reaction. Also, in the curing process, the epoxy resin is formed in close contact with the inner side by the action of the coagulating agent and is not exposed to the surface, and the inorganic component is agglomerated to the surface to form a matte inorganic layer. . Accordingly, peeling and cracking of the inorganic layer can be prevented, moisture resistance and weather resistance are improved, surface deterioration is prevented, and durability is improved.
The mortar composition for repairing and reinforcing concrete structures according to the present invention and the method for repairing and reinforcing concrete structures using the same are described in detail above.
The mortar composition for repairing and reinforcing concrete structures according to the present invention and the repairing and reinforcing method of concrete structures using the same can be used for maintenance and reinforcement of civil engineering structures such as emergency repair and quick repair of deteriorated concrete structures.
The mortar composition for repairing and reinforcing concrete structures according to the present invention suppresses permeation of deteriorating substances such as salts and acidic substances, thereby improving the durability of concrete structures, and is excellent in compatibility with cement.
In addition, the mortar composition for repairing and reinforcing concrete structures according to the present invention is excellent in adhesion to existing base materials, has no neutralization reaction with concrete, and is resistant to aging due to water resistance, ozone resistance, chemical resistance, water resistance, There is an advantage that the phenomenon does not occur.
Also, the mortar composition for repairing and reinforcing concrete structures according to the present invention is excellent in air permeability, does not cause condensation, does not oxidize the surface of the structure, has excellent permeability, hardens the infiltrated product, And has excellent waterproofness. Especially, it has the advantage of preventing cracking of the matrix in which shrinkage and expansion due to temperature changes are repeated, and is excellent in stretchability and is very suitable for work in a vibration area.
In addition, the mortar composition for repairing and reinforcing concrete structures according to the present invention is excellent in strength, so that a good structure can be obtained, the penetration of carbon dioxide is prevented, and the penetration of water is prevented. The mortar composition for repairing and reinforcing concrete structures according to the present invention has a low volatile organic compound (VOC) content, is environment-friendly, has no air pollution, exhibits high strength, has excellent early strength, Excellent ability and suppress cracking. The mortar composition for repairing and reinforcing concrete structures according to the present invention is excellent in water resistance, weather resistance, chemical resistance, and stain resistance and can protect the matrix and finish from chemical gas, exhaust gas, rainwater, etc., It does not use organic solvent (thinner, etc.) for construction and equipment cleaning, so there is no environmental pollution.
In addition, the mortar composition for repairing and reinforcing concrete structures according to the present invention is excellent in compatibility between a liquid component and a powder component, and is easily compounded, thus facilitating construction and excellent workability. The mortar composition for repairing and reinforcing concrete structures according to the present invention is excellent in high elasticity, smoothness, low-temperature stability (cracking resistance) and odorlessness, exhibits good dispersing action with a small mixing ratio with water, and maintains uniform strength and high strength . In addition, due to the good dispersing action of the binder, a high-density dense textured body is formed, which is excellent in chemical resistance (salt resistance and acid resistance) and inhibits penetration of water, oil and the like.
Also, since the mortar composition for repairing and reinforcing concrete structures according to the present invention is an inorganic material such as concrete, it is excellent in adhesion force due to affinity of similar materials, excellent in short-term adhesion strength and long-term stability, And it is economical. In addition, when the mortar composition for repairing and reinforcing concrete structures according to the present invention is used, there is an advantage that cracks are not generated due to proper balance of strength and stability.
Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited by the following examples.
[Example]
Example One
70 weight parts of Portland cement, 5 weight parts of clinker, 5 weight parts of gypsum, 5 weight parts of plaster, 5 weight parts of alpha type hemihydrate gypsum, 3 weight parts of silica fume, 3 weight parts of fly ash, 7 weight parts of limestone, , 7 parts by weight of calcined pozzolan and 3 parts by weight of microsilica were mixed to prepare a first powder component,
5 parts by weight of a siliceous waterproofing agent, 7 parts by weight of a CSA-based swelling agent, 0.1 part by weight of a viscosity enhancer, 1.0 part by weight of a fluidizing agent, 2 parts by weight of a curing accelerator, 0.2 part by weight of a retarder and 55 parts by weight of silica sand, After that,
The obtained first powder component and second powder component were mixed at a weight ratio of 50:50 to obtain a powder component.
Subsequently, the modified latex component was mixed with the SBR powder resin at a ratio of 100: 5: 5: 3 by weight of the ultra-rapid cement, carbon black and fibers, and 10 parts by weight of the modified component was prepared based on 100 parts by weight of the powder component.
Subsequently, 5 parts by weight of methyl methacrylate, 10 parts by weight of styrene monomer, 5 parts by weight of n-butyl acrylate, 5 parts by weight of methyl acrylate and 5 parts by weight of isobornyl acrylate were mixed, and 3 parts by weight of t-butyl peroxybenzoate And 4 parts by weight of glycerin fatty acid ester were mixed to obtain a liquid component, and 10 parts by weight of the powder component was prepared based on 100 parts by weight of the powder component.
Next, hydrophilic polyvinyl alcohol short fibers were prepared in an amount of 5 parts by weight based on 100 parts by weight of the powder component.
Then, 3 parts by weight of an additive component composed of a mixture of preservative, antifoaming agent and humectant was prepared.
100 parts by weight of a filler consisting of stoneware and talc and 150 parts by weight of silica sand were mixed with water to prepare a repair or reinforcement composition, and a mortar composition for repair and reinforcement was mixed with 100 parts by weight of the above- .
Comparative Example 1 (Experiment using the composition of Korean Patent No. 10-1528120)
7 parts by weight of methyl methacrylate, 8 parts by weight of styrene monomer, 10 parts by weight of n-butyl acrylate, 10 parts by weight of methyl acrylate and 5 parts by weight of isobornyl acrylate were mixed to prepare a liquid component, 3 parts by weight of glycerin fatty acid ester and 3 parts by weight of glycerin fatty acid ester were mixed to prepare a second liquid component. Then, 5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume, A first powder component was prepared by mixing 3 parts by weight of ash, 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolanas and 3 parts by weight of microsilica, and 20 parts by weight of oyster shell powder, 10 parts by weight 20 weight parts of waste glass powder, and 40 weight parts of waste stone powder were mixed to prepare a second powder component.
Then, the liquid component and the second liquid component were mixed at a weight ratio of 90:10 to prepare a liquid component. Then, based on 100 parts by weight of the liquid component, 5 parts by weight of the first powder component, 5 parts by weight of the second powder component And 3 parts by weight of long fiber of cellulose were mixed to prepare a maintenance enhancer composition.
Forty parts by weight of the thus prepared reinforcing agent composition was mixed with 40 parts by weight of filler consisting of stoneware and talc and 70 parts by weight of silica to prepare a mortar composition.
Comparative Example 2
5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume, and 3 parts by weight of fly ash 3 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolan, 3 parts by weight of microsilica and 2 parts by weight of long fiber of cellulose were mixed to prepare a maintenance enhancer composition.
30 parts by weight of a filler comprising stoneware and talc and 60 parts by weight of silica sand were mixed with 40 parts by weight of the thus prepared reinforcing agent composition to prepare a mortar composition.
Comparative Example 3
5 parts by weight of styrene monomer, 5 parts by weight of t-butyl peroxybenzoate and 5 parts by weight of glycerin fatty acid ester were mixed, and 5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of fume, 3 parts by weight of fly ash, 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolana, 3 parts by weight of microsilica and 2 parts by weight of long fiber of cellulose were mixed.
30 parts by weight of a filler comprising stoneware and talc and 60 parts by weight of silica sand were mixed with 40 parts by weight of the thus prepared reinforcing agent composition to prepare a mortar composition.
Comparative Example 4
30 parts by weight of n-butyl acrylate and 5 parts by weight of glycerin fatty acid ester were mixed, and 5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume, 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolan, 3 parts by weight of microsilica and 2 parts by weight of long fiber of cellulose were mixed to prepare a maintenance enhancer composition.
30 parts by weight of a filler comprising stoneware and talc and 60 parts by weight of silica sand were mixed with 40 parts by weight of the thus prepared reinforcing agent composition to prepare a mortar composition.
Comparative Example 5
30 parts by weight of isobornyl acrylate and 5 parts by weight of glycerin fatty acid ester were mixed. Then, 5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume, 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolan, 3 parts by weight of microsilica and 2 parts by weight of long fiber of cellulose were mixed to prepare a maintenance enhancer composition.
20 parts by weight of a filler comprising stoneware and talc and 70 parts by weight of silica sand were mixed with 40 parts by weight of the thus-prepared reinforcing agent composition to prepare a mortar composition.
Comparative Example 6
5 parts by weight of methyl methacrylate, 10 parts by weight of styrene monomer, 5 parts by weight of n-butyl acrylate, 5 parts by weight of methyl acrylate, 5 parts by weight of isobornyl acrylate, 0.1 part by weight of t-butyl peroxybenzoate, And 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume, 3 parts by weight of fly ash, 7 parts by weight of limestone, 7 parts by weight of calcined pozzolanas, 3 parts by weight of microsilica and 2 parts by weight of cellulose long fibers were mixed to prepare a maintenance enhancer composition.
20 parts by weight of a filler comprising stoneware and talc and 70 parts by weight of silica sand were mixed with 40 parts by weight of the thus-prepared reinforcing agent composition to prepare a mortar composition.
Comparative Example 7
5 parts by weight of methyl methacrylate, 10 parts by weight of styrene monomer, 5 parts by weight of n-butyl acrylate, 5 parts by weight of methyl acrylate, 5 parts by weight of isobornyl acrylate, 0.1 part by weight of t-butyl peroxybenzoate, And 0.1 part by weight of the ester were mixed, and 46 parts by weight of limestone was further mixed therewith to prepare a maintenance enhancer composition.
30 parts by weight of a filler comprising stoneware and talc and 60 parts by weight of silica sand were mixed with 40 parts by weight of the thus prepared reinforcing agent composition to prepare a mortar composition.
Performance evaluation
1. Bending strength, compressive strength, tensile strength, bond strength and volume change rate test
The flexural strength, compressive strength, tensile strength, volume change rate and adhesion strength of the mortar composition for repair and reinforcement prepared in Example 1 and Comparative Examples 1 to 7 were measured.
The bending strength, the compressive strength, the tensile strength and the adhesion strength were measured according to the standard of KS F 4042-02 28 days after the concrete repair reinforcing agent was applied. The volume change rate was calculated by dividing the volume of the mortar composition for maintenance and reinforcement after 28 days To 35 < 0 > C. The results are shown in Table 1 below.
(N / mm < 2 &
(N / mm < 2 &
(N / mm < 2 &
(MPa)
(%)
Referring to Table 1, the mortar composition for repair and reinforcement according to the present invention shows that the mortar composition of the present invention is superior in strength and adhesion performance compared to conventional materials.
2. Waterproof and chemical resistance test
The waterproofing and chemical resistance of the mortar composition for repair and reinforcement prepared according to Example 1 and Comparative Examples 1 to 7 were measured.
The waterproofness was evaluated by applying the repair mortar composition on the concrete structure to a thickness of 1 cm and installing a cylindrical water tank on the mortar composition layer to check whether the water penetrated into the concrete structure for 6 months.
The chemical resistance was evaluated by treating the mortar composition layer having a salt concentration of 35 ‰ and the sulfuric acid solution having a concentration of 2% on the mortar composition layer after 28 days of curing on the concrete structure for 1 hour each day, And was confirmed for 60 days.
The results are shown in Table 2 below.
(month)
As shown in Table 2, in the case of Example 1, moisture was not penetrated at all for 6 months. On the other hand, in Comparative Examples 1 to 7, water was infiltrated after 1 to 2 months. This is interpreted as a result of showing the excellent waterproof performance of the mortar composition for repair and reinforcement according to the present invention.
In Table 2, it can be seen that no surface damage was caused by the brine treated for 60 days in Example 1, and no surface damage was observed for 45 to 52 days when the sulfuric acid solution was treated. On the other hand, in the case of Comparative Examples 1 to 7, the surface damage occurred 20 to 40 days after the saline treatment, and when the sulfuric acid solution was treated, the surface damage occurred within 5 to 15 days.
This is interpreted as a result of supporting the excellent chemical resistance of the mortar composition for repair and reinforcement according to the present invention.
3. Freeze-thaw resistance, crack resistance and dry shrink resistance
The freeze-thaw resistance, crack resistance and shrinkage resistance of the mortar composition for repair and reinforcement prepared according to Example 1 and Comparative Examples 1 to 7 were measured.
The freeze-thaw resistance was tested by the freeze-thaw resistance test according to KS F 2456.
Crack resistance was tested according to AASHTO PP34-98.
Dry shrinkage resistance was tested according to KS F 2424.
The results are shown in Table 3.
Table 3 shows that the mortar composition for repair and reinforcement of Example 1 according to the present invention is superior to the conventional materials in terms of freeze-thaw resistance, crack resistance and drying shrinkage resistance.
Claims (6)
(1) 50 to 100 parts by weight of cement, 0.5 to 10 parts by weight of clinker, 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of alpha type hemihydrate, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, 10 to 70% by weight of a first powder component comprising 0.5 to 10 parts by weight of limestone, 1 to 20 parts by weight of blast furnace slag, 0.01 to 10 parts by weight of calcined pozzolan and 0.01 to 10 parts by weight of microsilica; 2 to 7 parts by weight of a siliceous waterproofing agent, 5 to 10 parts by weight of a CSA expanding agent, 0.05 to 0.2 parts by weight of a viscosity enhancer, 0.3 to 1.1 parts by weight of a fluidizing agent, 0.5 to 1.0 part by weight of a curing accelerator, And 42 to 64 parts by weight of silica sand and 30 to 90% by weight of a second powder component comprising 100 parts by weight of the powder component.
(2) One or more powder or liquid rubber selected from ethylene-vinyl acetate (EVA) resin, NR (natural rubber) resin, NBR (natural rubber-butadiene rubber) resin and SBR 1 to 20 parts by weight of a modified latex component obtained by mixing a resin with cement-like quick-setting cement, carbon black and fibers;
(3) 1 to 7 parts by weight of methyl methacrylate, 5 to 20 parts by weight of styrene monomer, 1 to 10 parts by weight of n-butyl acrylate, 0.1 to 10 parts by weight of methyl acrylate, 0.1 to 10 parts by weight of isobornyl acrylate, 0.05 to 5 parts by weight of an initiator and 0.05 to 5 parts by weight of an emulsifier;
(4) 1 to 10 parts by weight of a hydrophilic polyvinyl alcohol short fiber component; And
(5) 1 to 5 parts by weight of an additive component comprising a mixture of a preservative, an antifoaming agent and a humectant;
;
B. 100 to 200 parts by weight of a filler and 100 to 250 parts by weight of an aggregate based on 100 parts by weight of the above-mentioned concrete cross-sectional repair filler composition are mixed with water to prepare a mortar composition for reinforcing a concrete structure;
C. Chipping the work surface of the damaged concrete structure and finishing the section until an undamaged portion is obtained; And
D. applying and curing the mortar composition for reinforcing the section of the concrete structure obtained in the step B to the trimmed surface to be applied;
Repair and Rehabilitation of Concrete Structures.
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