KR101580677B1 - Reinforcing material for concrete structure - Google Patents
Reinforcing material for concrete structure Download PDFInfo
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- KR101580677B1 KR101580677B1 KR1020140075616A KR20140075616A KR101580677B1 KR 101580677 B1 KR101580677 B1 KR 101580677B1 KR 1020140075616 A KR1020140075616 A KR 1020140075616A KR 20140075616 A KR20140075616 A KR 20140075616A KR 101580677 B1 KR101580677 B1 KR 101580677B1
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Classifications
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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
- 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
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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
- 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
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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
- 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
- C04B14/38—Fibrous materials; Whiskers
Abstract
The present invention relates to a process for producing a polyurethane foam, which 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, 0.1 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; And 51 to 180 parts by weight of a reinforcing mortar containing long fibers and cement. The reinforcing mortar is excellent in chemical resistance, radiation shielding effect and waterproofing property, exhibits excellent adhesion performance and high strength property, and is easy to apply One advantage.
Description
More particularly, the present invention relates to an acrylic emulsion reinforcing resin containing methyl methacrylate, styrene monomer, n-butyl acrylate, methyl acrylate, isobornyl acrylate, initiator and emulsifier, Reinforced mortar containing fibers and cement, which are excellent in chemical resistance and waterproofness, and have excellent adhesion performance and high strength properties.
Concrete structures are subject to various damages as exposed to external air and rainfall environments. In order to prevent or repair the damage of the concrete structure, various kinds of repairing reinforcement materials are used. Particularly, a polymer mortar mixed with cement and various polymers has been conventionally used for restoring a section of a concrete structure, and an epoxy resin series is mainly used as the polymer. However, the cross - section mortar using the epoxy resin type polymer has a disadvantage that it is not high in flexural strength, tensile strength and compressive strength, and is particularly vulnerable to an acidic environment.
Meanwhile, recently, a concrete reinforcement material for a concrete structure using an acrylic resin-based polymer has been developed, but it has a disadvantage that sufficient chemical resistance and waterproofing property can not be secured by using only methyl methacrylate.
In particular, concrete structures are used not only for civil structures such as bridges, roads, and tunnels but also for marine port structures and underwater structures. Therefore, in order to repair and reinforce these structures, Development of reinforcing materials is required. In addition, in the case of concrete structures such as nuclear power plants and nuclear waste disposal sites, radiation shielding performance is further required.
On the other hand, the repairing reinforcement of the concrete structure is required to have excellent adhesion performance to be firmly bonded to the concrete structure to be repaired and reinforced due to its nature directly applied to the surface of the concrete structure.
Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an acrylic emulsion reinforcing resin containing methyl methacrylate, styrene monomer, n-butyl acrylate, methyl acrylate, isobornyl acrylate, initiator and emulsifier, It has been found that a concrete reinforcement material having excellent adhesion and excellent strength and excellent chemical resistance and waterproof property can be obtained by mixing reinforcing mortar, and the present invention has been completed based on this finding.
Accordingly, one aspect of the present invention is to provide a repair reinforcement material for a concrete structure having excellent chemical resistance and waterproofness, excellent adhesion performance, and high strength.
In order to attain the object of the present invention, the repair and reinforcement material of the concrete structure is made up of 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; And 51 to 180 parts by weight of a reinforcing mortar comprising long fibers and cement.
In one embodiment of the present invention, the reinforcing mortar may comprise 1 to 30 parts by weight of long fiber and 50 to 150 parts by weight of cement.
In another embodiment of the present invention, the cement comprises 0.5 to 10 parts by weight of clinker, 1 to 10 parts by weight of gypsum, 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of anhydrous gypsum, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of ash, 0.5 to 10 parts by weight of limestone, 0.01 to 5 parts by weight of slag, 0.01 to 10 parts by weight of a calcined pozzolan and 0.01 to 10 parts by weight of microsilica.
In another embodiment of the present invention, the bending strength of the repair reinforcement after curing is 15 to 25 N / mm 2, the compressive strength is 50 to 70 N / mm 2, and the tensile strength is 5 to 10 N / mm 2.
In another embodiment of the present invention, the volume change rate at 0 to 35 ° C after curing of the repair reinforcement may be 0.0001 to 0.0005%.
In another embodiment of the present invention, the adhesion strength of the repair reinforcement after curing may be 1.5 to 2 MPa.
The repair reinforcement of the concrete structure according to the present invention comprises an acrylic emulsion reinforcing resin including methyl methacrylate, styrene monomer, normal butyl acrylate, methyl acrylate, isobornyl acrylate, initiator and emulsifier, By mixing the reinforcing mortar, it has excellent chemical resistance, radiation shielding effect, waterproof property, excellent adhesion performance, high strength property, and easy construction.
Before describing the invention in more detail, it is to be understood that the words or words used in the specification and claims are not to be construed in a conventional or dictionary sense, It should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the constitution of the embodiments described in the present specification is merely a preferred example of the present invention, and does not represent all the technical ideas of the present invention, so that various equivalents and variations And the like.
Hereinafter, preferred embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.
The repair reinforcement of the concrete structure according to the present invention is a one-pack type repair reinforcement mixed with a liquid acrylic emulsion resin and a powder reinforcing mortar, and can be mixed with water at the construction site.
Wherein the acrylic emulsion resin is a form in which an initiator and an emulsifier are added to methyl methacrylate, styrene monomer, n-butyl acrylate, methyl acrylate and isobornyl acrylate, the methyl methacrylate is contained in an amount of 1 to 7 parts by weight, The monomer is 5 to 20 parts by weight, the n-butyl acrylate is 1 to 10 parts by weight, the methyl acrylate is 0.1 to 10 parts by weight, the isobornyl acrylate is 0.1 to 10 parts by weight, the initiator is 0.05 to 5 parts by weight And 0.05 to 5 parts by weight of the emulsifier.
Methyl methacrylate (MMA) serves to enhance the viscosity and adhesion of the repair reinforcement according to the present invention. Therefore, when the amount of the methyl methacrylate is less than 1 part by weight, the viscosity of the repair reinforcement lowers and the adhesion performance to the concrete structure is deteriorated. When the amount exceeds 7 parts by weight, the acrylic emulsion resin The long fibers and cement can not be easily mixed with each other, resulting in a problem that the dispersibility of the acrylic emulsion resin is deteriorated and also the workability is deteriorated due to the excessive viscosity.
The styrene monomer is polymerized in the form of a polymer by an initiator and serves to accelerate the hardening of the repair reinforcement according to the present invention and increase the strength. Therefore, when the styrene monomer is contained in an amount of less than 5 parts by weight, the curing rate of the repair reinforcement decreases and the strength of the cured repair reinforcement decreases. When the amount exceeds 20 parts by weight, it is uneconomical.
The n-butyl acrylate serves to improve the adhesion performance of the repair reinforcement according to the present invention. Therefore, when the content of the n-butyl acrylate is less than 1 part by weight, the adhesion of the repair reinforcing material is lowered, and when it exceeds 10 parts by weight, it is uneconomical.
Methyl acrylate serves to improve the adhesion performance and strength of the repair reinforcement according to the present invention. Therefore, when the methyl acrylate is contained in an amount of less than 0.1 part by weight, adhesion performance and strength characteristics are deteriorated, and when it exceeds 10 parts by weight, it is uneconomical.
The isobornyl acrylate serves to improve the dispersibility of the components contained in the repair reinforcement according to the present invention. Therefore, when the amount of the isobornyl acrylate is less than 0.1 part by weight, the dispersibility of various components is decreased and it is difficult to obtain uniform physical properties of the repair reinforcement. When the amount exceeds 10 parts by weight, There is a problem that it is difficult to obtain excellent strength and adhesion performance of the repair reinforcement.
The initiator serves to initiate the polymerization of the styrene monomers and includes, for example, t-butyl peroxybenzoate, benzoyl peroxide, methyl ethyl ketone peroxide, cumene hydroperoxide, t- , 5-dimethylhexyl-2,5-diperoxybenzoate, and the like can be used. When the content of the initiator is less than 0.05 part by weight, the polymerization initiating reaction of the styrene monomer is lowered to lower the strength characteristics of the binder repair reinforcing material. When the content of the initiator exceeds 5 parts by weight, the polymerization initiating reaction of the styrene monomer is effectively controlled There is a problem that can not be achieved.
The emulsifier serves to easily mix the repair reinforcement with water when adding water to the repair reinforcement according to the present invention. The emulsifier may be glycerin fatty acid ester, sorbitan fatty acid ester, polyglycerin fatty acid ester, or the like. When the content of the emulsifier is less than 0.05 part by weight, there is a problem that the repair reinforcing material is not easily mixed with water when the repair reinforcing material is applied. When the amount exceeds 5 parts by weight, the strength and adhesion performance of the repair reinforcing material are deteriorated .
The reinforcing mortar includes long fibers and cement, and is the main material of the repair reinforcement according to the present invention. The reinforcing mortar may comprise 1 to 30 parts by weight of long fiber and 50 to 150 parts by weight of cement.
The long fiber reinforces the strength of the repair reinforcement, suppresses the volume expansion, and prevents the repair reinforcement from breaking or cracking, particularly when an earthquake occurs. When the content of the long fibers is less than 1 part by weight, the effect of suppressing cracking and volume expansion of the repair reinforcement is low. When the content of the long fibers is more than 30 parts by weight, uniform mixing of cement and resin is hindered.
The cement serves to enhance the strength and water resistance of the repair reinforcement according to the present invention. If the content of the cement is less than 50 parts by weight, the strength of the repair reinforcement becomes low and the manufacturing cost increases. When the content exceeds 150 parts by weight, the content ratio of other components is relatively low, .
On the other hand, the cement contained in the repair reinforcement according to the present invention comprises 0.5 to 10 parts by weight of clinker, 1 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of anhydrous gypsum, 0.1 to 5 parts by weight of silica fume 0.01 to 5 parts by weight of fly ash, 0.5 to 10 parts by weight of limestone, 0.01 to 5 parts by weight of slag, 0.01 to 10 parts by weight of calcined pozzolan and 0.01 to 10 parts by weight of microsilica, ≪ / RTI >
The clinker is composed of calcium silicate such as alite, berylite, and celite. The clinker serves to promote the mixing of cement and water. Therefore, when the content of the clinker is less than 0.5 part by weight, mixing of cement and water is not easy, and when it exceeds 10 parts by weight, the strength of cement is lowered.
Gypsum improves the adhesion by increasing the viscosity of the cement when the cement is mixed with water. Therefore, when the content of the gypsum is less than 1 part by weight, the viscosity and adhesion of the repairing reinforcement according to the present invention are reduced. When the amount of the gypsum is more than 10 parts by weight, the strength of the repairing reinforcement is lowered.
The plaster plays a role in facilitating the mixing of the ingredients in the cement with water. Therefore, when the content of the plaster is less than 0.5 parts by weight, various components contained in the cement are difficult to be easily mixed with water. When the content of the plaster exceeds 10 parts by weight, the strength and chemical resistance of the repair reinforcement are lowered .
Anhydrous gypsum is an anhydrous mineral of calcium sulfate, which is dissolved in hydrochloric acid. When water is absorbed, it becomes gypsum. The anhydrous gypsum improves the adhesion of the cement when the cement and water are mixed, thereby improving the adhesion of the repair reinforcement according to the present invention. Therefore, when the content of the gypsum anhydride is less than 0.5 parts by weight, the adhesion of the repair reinforcement decreases. When it exceeds 10 parts by weight, the chemical resistance is deteriorated.
Silica fume is an amorphous active silica having an average particle diameter of about 0.15 mu m and is a nearly spherical particle. Silica fume improves the waterproof and chemical resistance by filling effect between cement particles due to the characteristics of spherical particles, and improves the strength of the repair reinforcement. In particular, silica fume also plays a role in improving the adhesion performance of the repair reinforcement. Therefore, when the content of the silica fume is less than 0.1 parts by weight, the water repellency and chemical resistance of the repair reinforcing material are lowered and the strength is lowered. When the content is more than 5 parts by weight, cracks may occur in the repair reinforcement .
Fly ash is used in coal-burning facilities such as coal-fired power plants, where coal remains in the oxide form and remains as fine dusts of silicon oxide (SiO 2 ) or aluminum oxide (Al 2 O 3 ) it means. The size of the fly ash particles is similar to that of cement. When mixed with fly ash, the workability is improved and the hardening heat is lowered, as well as the long-term strength and water tightness are improved, which is economical. The fly ash serves to enhance the adhesion performance of the repair reinforcement according to the present invention. Therefore, when the content of the fly ash is less than 0.01, the performance of the repair reinforcement is deteriorated, and when it exceeds 5 parts by weight, the chemical resistance is deteriorated.
Limestone plays a role in additionally enhancing the adhesion of the repair reinforcement according to the present invention. Therefore, when the content of the limestone is less than 0.5 parts by weight, the effect of improving the adhesion of the repair reinforcement is deteriorated, and when it exceeds 10 parts by weight, the chemical resistance is deteriorated.
Slag means blast furnace slag, and is a by-product of steel making in steelworks. The main component of the slag is alumina silicate. When mixed with cement, it plays a role of lowering the heat of hydration, which is generated in the curing process of cement, and enhances the durability and chemical resistance of the repair reinforcement. Particularly, since the slag has low permeability, it also improves the water resistance of the repair reinforcement according to the present invention. Therefore, when the content of the slag is less than 0.01 parts by weight, the durability, chemical resistance, and water resistance of the repair reinforcement deteriorate. If the content of the slag exceeds 5 parts by weight, cracks may occur in the repair reinforcement, There is a problem.
The calcined pozzolana is prepared by adding calcium to natural pozzolana which is mainly composed of fine red, volcanic soil, and plays a role of improving the water resistance of the repair reinforcement according to the present invention. Therefore, when the content of the lower phospololane is less than 0.01 part by weight, the water repellency of the repair reinforcing material is lowered, and when it exceeds 10 parts by weight, the strength of the repair reinforcing material is lowered.
The micro silica is a silica particle having a particle diameter of 10 to 200 탆 and serves to improve the strength and chemical resistance of the repair reinforcement according to the present invention. Therefore, when the content of the microsilica is less than 0.01 parts by weight, the strength and chemical resistance of the repair reinforcement deteriorate. When the content of the microsilica exceeds 10 parts by weight, adhesion of the repair reinforcement decreases.
The repairing reinforcement according to the present invention can be used for repairing and reinforcing concrete structures in various fields. For example, it can be used for reinforcing the slab maintenance of bridges, repairing bridge piers, repairing joints, reinforcing railings, reinforcing concrete roads, Repair of joints, maintenance of joints, maintenance of joints, repair of joints, anti-neutralization coating, repair of leakage areas, repair of cross sections of tunnels, maintenance of neutralization, maintenance of linings, repair of leaking parts, maintenance of reinforcement of dams, It can be used for maintenance and reinforcement of civil engineering structures such as reinforcement, electric power, sewage culverts, underground joints, bopp river, hume pipe, water pipe, retaining wall, thin layer and back layer repair of airplane runway, repair of various concrete structures .
Also, the repair reinforcement according to the present invention can be used for repair and reinforcement of slabs, beams, columns, walls, and for repairing and reinforcing the floor of buildings, especially for repairing the floor of a color harder, It can be used for repair and reinforcement of columns, columns, rock walls and other offshore structures. It can be used for high strength and high density characteristics It can be used for maintenance and reinforcement of nuclear power plants and nuclear waste disposal facilities.
The repair reinforcement of the concrete structure according to the present invention improves the durability of the concrete structure by suppressing penetration of deteriorating substances such as salts and acidic substances and is excellent in compatibility with cement.
In addition, the repair reinforcement of the concrete structure according to the present invention is excellent in adhesion to existing base materials, does not have a neutralization reaction with concrete, and is resistant to aging due to water resistance, ozone resistance, chemical resistance, water resistance, air permeability, There is an advantage not to occur.
In addition, the repair reinforcement material of the concrete structure according to the present invention is excellent in air permeability, does not cause condensation, does not oxidize the surface of the structure, is excellent in permeability, and has excellent densities, durability, And particularly, it has an advantage of being excellent in workability of a vibration part because it is excellent in stretchability and prevents cracking of a mother body in which shrinkage and expansion are repeated due to temperature change.
In addition, the repair reinforcement material of the concrete structure 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 repair and reinforcement material of the concrete structure according to the present invention is environmentally friendly, low in air pollution, high in strength development, excellent in early strength, and has fine particles, It is excellent and suppresses cracking. The repair and reinforcement material of the concrete structure according to the present invention is excellent in water resistance, weather resistance, chemical resistance and stain resistance and can protect the matrix and the finish surface from chemical gas, exhaust gas and rainwater, and has a great effect on the protection finishing of the exposed concrete structure There is no environmental pollution because organic solvents (thinner, etc.) are not used for construction and equipment cleaning.
Also, the repair reinforcing material of the concrete structure according to the present invention is excellent in workability because it is excellent in miscibility using a one-liquid type liquid phase and requires no mixing process, thereby facilitating construction. The repair and reinforcement material of the concrete structure 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 at the same time. Also, because of the good dispersing action of cement, it forms dense and compact structure, and it has excellent chemical resistance (salt resistance, acid resistance) and suppresses penetration of water, oil and the like.
In addition, since the repair reinforcement material of the concrete structure according to the present invention is an inorganic material such as concrete, it is excellent in adhesion force due to the affinity of similar materials and excellent in both short-term adhesive strength and long-term stability. It is economical because it has excellent adhesion strength and shows low rebound rate of 5% or less. In addition, when the repair reinforcement of the concrete structure according to the present invention is used, cracks do not occur due to proper balance between strength and stability.
Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the scope of the present invention is not limited to the following examples.
Example 1
50 g of methyl methacrylate, 100 g of styrene monomer (DAJIN CHEMICAL, CAS No. 100-42-5), 50 g of n-butyl acrylate, 50 g of methyl acrylate, 50 g of isobornyl acrylate, 10 g of t-butyl peroxybenzoide, And 50 g of plaster, 50 g of plaster, 50 g of anhydrous gypsum, 30 g of silica fume, 30 g of fly ash, 70 g of limestone (CaCO 3 ), 30 g of slag, 30 g of calcined pozzolan 30 g of microsilica and 540 g of calcium oxide (CaO) were mixed with 1000 g of cement to prepare a concrete repair reinforcement according to the present invention.
Example 2
Methyl methacrylate, styrene monomer (Daejin Chemical, CAS No. 100-42-5) 80 g of n-butyl acrylate, 100 g of methyl acrylate, 5 g of isobornyl acrylate, 10 g of t-butyl peroxybenzoate and 10 g of glycerin fatty acid ester were mixed with 150 g of long fiber, 50 g of clinker, 50 g of gypsum , Concrete 50 g, gypsum anhydrite 50 g, silica fume 30 g, fly ash 30 g, limestone 70 g, slag 30 g, calcined pozzolan 70 g, microsilica 30 g and lime lime 540 g were mixed to prepare a concrete repair reinforcement according to the present invention Respectively.
Example 3
Methyl methacrylate, styrene monomer (Daejin Chemical, CAS No. 100-42-5) 10 g of long fiber and 50 g of clinker, 50 g of gypsum, 50 g of n-butyl acrylate, 50 g of methyl acrylate, 50 g of isobornyl acrylate, 10 g of t-butyl peroxybenzoate and 10 g of glycerin fatty acid ester , Concrete 50 g, gypsum anhydrite 50 g, silica fume 30 g, fly ash 30 g, limestone 70 g, slag 30 g, calcined pozzolan 70 g, microsilica 30 g and lime lime 540 g were mixed to prepare a concrete repair reinforcement according to the present invention Respectively.
Comparative Example 1
300g of methyl methacrylate and 10g of glycerin fatty acid ester were mixed with 150g of long fiber and 50g of clinker, 50g of plaster, 50g of plaster, 50g of anhydrous gypsum, 30g of silica fume, 30g of fly ash, 70g of limestone, 70 g of calcined pozzolan, 30 g of microsilica and 540 g of quicklime were mixed with 1000 g of cement to prepare a concrete repair reinforcement.
Comparative Example 2
300 g of styrene monomer (DASEN CHEMICAL, CAS No. 100-42-5), 10 g of t-butyl peroxybenzoate and 10 g of glycerin fatty acid ester were mixed with 150 g of long fiber, 50 g of clinker, 50 g of gypsum, 50 g of anhydrous gypsum, 30 g of fumed silica, 30 g of fly ash, 70 g of limestone, 30 g of slag, 70 g of calcined pozzolan, 30 g of microsilica and 540 g of quicklime were mixed with 1000 g of cement to prepare a concrete repair reinforcement.
Comparative Example 3
50 g of gypsum, 50 g of plaster, 50 g of anhydrous gypsum, 30 g of silica fume, 30 g of fly ash, 70 g of limestone, 30 g of slag, 50 g of gypsum, 50 g of clinker, 50 g of anhydrous gypsum, 300 g of n-butyl acrylate and 10 g of glycerin fatty acid ester, 70 g of calcined pozzolan, 30 g of microsilica and 540 g of quicklime were mixed with 1000 g of cement to prepare a concrete repair reinforcement.
Comparative Example 4
300 g of isobornyl acrylate and 10 g of glycerin fatty acid ester were mixed with 150 g of long fiber and 50 g of clinker, 70 g of calcined pozzolan, 30 g of microsilica and 540 g of quicklime were mixed with 1000 g of cement to prepare a concrete repair reinforcement.
Comparative Example 5
50 g of methyl methacrylate, 100 g of styrene monomer (DAJIN CHEMICAL, CAS No. 100-42-5), 50 g of n-butyl acrylate, 50 g of methyl acrylate, 50 g of isobornyl acrylate, 10 g of t-butyl peroxybenzoide, 50 g of gypsum, 50 g of anhydrous gypsum, 30 g of silica fume, 30 g of fly ash, 70 g of limestone, 30 g of slag, 70 g of calcined pozzolan, 30 g of microsilica and 540 g of burnt lime were added to the acrylic emulsion reinforcing resin containing 10 g of fatty acid ester Were mixed with 1000g of cement to prepare concrete repair reinforcement.
Comparative Example 6
50 g of methyl methacrylate, 100 g of styrene monomer (DAJIN CHEMICAL, CAS No. 100-42-5), 50 g of n-butyl acrylate, 50 g of methyl acrylate, 50 g of isobornyl acrylate, 10 g of t-butyl peroxybenzoide, Acrylic emulsion reinforcing resin containing 10 g of fatty acid ester was mixed with 1000 g of cement containing 150 g of long fiber, 460 g of limestone and 540 g of quicklime to prepare a concrete repair reinforcement.
[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 concrete repair reinforcement prepared according to Example 1 and Comparative Examples 1 to 6 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 after 28 days of the concrete repair reinforcement, and the volume change rate was calculated as follows. The volume of the repair reinforcement after 28 days of the concrete repair reinforcement was set to 0 And the degree of volume change was measured daily by varying the temperature from < RTI ID = 0.0 > 35 C < / RTI >
(N / mm < 2 &
(N / mm < 2 &
(N / mm < 2 &
(MPa)
(%)
Referring to Table 1, the repair reinforcement of the concrete structure according to the present invention has a flexural strength of 15 to 25 N / mm 2, a compressive strength of 50 to 70 N / mm 2, a tensile strength of 5 to 10 N / And the volume change rate was measured to be in the range of 0.0001 to 0.0005%. However, Comparative Examples 1 to 6 exhibited flexural strengths of 8.5 to 15.5 N / mm 2, compressive strengths of 35.0 to 40.0 N / mm 2, tensile strengths of 2.9 to 4.4 N / mm 2, and adhesion strengths of 0.5 to 1.2 MPa, The volume change rate was measured from 0.0008 to 0.0015%.
These results are evaluated as indicating excellent strength and adhesion performance of the repairing reinforcement of the concrete structure according to the present invention.
[Water resistance and chemical resistance test]
The water repellency and chemical resistance of the concrete repair reinforcement prepared according to Example 1 and Comparative Examples 1 to 6 were measured.
The water repellency was evaluated by coating the repair reinforcement with concrete to a thickness of 1 cm on the concrete structure, installing a cylindrical water tank on the repairing reinforcement layer, and confirming whether the water penetrated into the concrete reinforcement layer every month.
The chemical resistance was evaluated by treating each of the brine with a salinity of 35 ‰ and the sulfuric acid solution of 2% concentration on the concrete structure for 1 hour every day for 28 days after the hardening on the concrete structure. For 60 days.
The results are shown in Table 2 below.
(month)
As shown in Table 2, in the case of Examples 1 to 3, moisture was not penetrated at all for 6 months, while in Comparative Examples 1 to 6, water was infiltrated after 1 to 2 months. This is interpreted as a result of showing excellent waterproof performance of the repair reinforcement of the concrete structure according to the present invention.
In addition, in Table 1, it can be seen that no surface damage was caused by the brine treated for 60 days in Examples 1 to 3, and surface damage did not occur for 45 to 52 days when the sulfuric acid solution was treated . On the other hand, in the case of Comparative Examples 1 to 6, 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 repair reinforcement of the concrete structure according to the present invention.
Claims (6)
51 to 180 parts by weight of reinforcing mortar comprising 1 to 30 parts by weight of long fiber and 50 to 150 parts by weight of cement.
Wherein the cement comprises 0.5 to 10 parts by weight of clinker, 1 to 10 parts by weight of gypsum, 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of anhydrous gypsum, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, 0.01 to 10 parts by weight of silica fine particles, 0.01 to 10 parts by weight of silica fine particles, 0.01 to 5 parts by weight of slag, 0.01 to 10 parts by weight of calcined pozzolanas and 0.01 to 10 parts by weight of micro silica fine particles.
Wherein the repair reinforcement has a flexural strength after curing of 15 to 25 N / mm 2, a compressive strength of 50 to 70 N / mm 2, and a tensile strength of 5 to 10 N / mm 2.
Wherein the volume change rate at 0 to 35 캜 after curing of the repair reinforcement is 0.0001 to 0.0005%.
Wherein the reinforcing reinforcement has an adhesion strength after curing of 1.5 to 2 MPa.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101851207B1 (en) * | 2016-12-02 | 2018-04-25 | 자암건설(주) | Maintenance reinforcing composition for improving freeze-thawing, salt tolerance and adhesion of concrete structure and repair reinforcing method using the same |
| KR102329798B1 (en) * | 2020-12-22 | 2021-11-24 | 추홍수 | Concrete composition for repair and reinforcement including fiber reinforcement and repair and reinforcement method for concrete structures using the same |
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| JPH09184304A (en) * | 1995-11-01 | 1997-07-15 | Mitsubishi Rayon Co Ltd | Method of repairing and reinforcing existent construction and repairing and reinforcing member |
| JP2010229008A (en) * | 2009-03-30 | 2010-10-14 | Ube Ind Ltd | Polymer cement composition, mortar, and structure using them |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH09184304A (en) * | 1995-11-01 | 1997-07-15 | Mitsubishi Rayon Co Ltd | Method of repairing and reinforcing existent construction and repairing and reinforcing member |
| JP2010229008A (en) * | 2009-03-30 | 2010-10-14 | Ube Ind Ltd | Polymer cement composition, mortar, and structure using them |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101851207B1 (en) * | 2016-12-02 | 2018-04-25 | 자암건설(주) | Maintenance reinforcing composition for improving freeze-thawing, salt tolerance and adhesion of concrete structure and repair reinforcing method using the same |
| KR102329798B1 (en) * | 2020-12-22 | 2021-11-24 | 추홍수 | Concrete composition for repair and reinforcement including fiber reinforcement and repair and reinforcement method for concrete structures using the same |
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