KR101667530B1 - FRP Composition for Reinforcement of Concrete Structure Using Complex Material Manufactured by Drawing of Basalt Fiber, Glass Fiber, Carbon Fiber and Metal Fiber Used in High Strength Urethane Resin and Reinforcement of Concrete Structure Using Thereof - Google Patents
FRP Composition for Reinforcement of Concrete Structure Using Complex Material Manufactured by Drawing of Basalt Fiber, Glass Fiber, Carbon Fiber and Metal Fiber Used in High Strength Urethane Resin and Reinforcement of Concrete Structure Using Thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/282—Polyurethanes; Polyisocyanates
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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
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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
- C04B14/386—Carbon
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/0016—Granular materials, e.g. microballoons
- C04B20/002—Hollow or porous granular materials
- C04B20/004—Hollow or porous granular materials inorganic
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
- C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
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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
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
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Abstract
The present invention relates to a rubber composition comprising 5 to 50 parts by weight of a filler comprising aluminum hydroxide, calcium carbonate or a mixture thereof, based on 100 parts by weight of a urethane resin; 70 to 90 parts by weight of a molded product obtained by drawing basalt fiber, aramid fiber, glass fiber, carbon fiber or a mixture of at least one selected from the foregoing; 5 to 20 parts by weight of a curing agent; 1 to 10 parts by weight of an adhesion promoter; And 3 to 15 parts by weight of a water-reducing finishing agent.
The FRP composition according to the present invention can be impregnated into a composite material obtained by drawing a high-strength urethane resin into basalt fiber, glass fiber, carbon fiber, metal fiber, etc., thereby improving the mechanical performance, durability, impact resistance and strength The moldability is good, the production process is simple, and the production cost is low.
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a FRP composition for repairing and reinforcing a concrete structure using a composite material obtained by drawing a basalt fiber, glass fiber, carbon fiber, metal fiber or the like using a high strength urethane resin, FRP for repair and reinforcement of concrete structures using composite material obtained by drawing basalt fiber, glass fiber, carbon fiber, and metal fiber using high strength urethane resin to increase the strength and structural strength of concrete structure attached at a distance. And a method of repairing and reinforcing the same.
Generally, as time goes by, the durability and the load-bearing capacity are reduced due to various causes such as design and construction defects, structural changes during use, aging due to environmental changes, natural disasters and fire, Structures received can lead to disintegration. Not only large-scale disasters such as human casualties, but also major facilities and transportation networks, which are social infrastructure, suffer long-term paralysis and require massive construction costs.
In order to secure the safety of the structures damaged by structural damage, a total or partial reinforcement action is indispensable. Various repair and reinforcement methods have been developed to solve these problems. The main reinforcement methods include a steel sheet reinforcement method, Reinforcement method, and fiberboard reinforcement method. Depending on the construction method, it can be divided into field impregnation reinforcement method, compression reinforcement method, adhesive reinforcement method, and landfill reinforcement method.
Here, the steel plate reinforcing method has been widely applied to actual structures due to the proven reinforcing effect and workability. However, the steel plate reinforcing method is problematic in terms of workability and maintenance because it is vulnerable to heavy weight and corrosion of the steel plate.
Especially, due to the excessive weight of the steel sheet, heavy equipment is required at the time of construction. There is a risk of fire due to welding work and other anti-corrosive coating is needed to prevent corrosion.
In addition, the steel plate reinforcing method described above has a problem in durability, such as weakening of the adhesion force generated at the interface between the target structure and the reinforcing material, due to the sealing phenomenon due to the air permeability loss.
And the field impregnation strengthening method is a reinforcement method using fiber reinforced composite materials such as carbon fiber, glass fiber and aramid fiber in a low cost and easy to handle, fast and easy construction workability and excellent durability. Has come.
However, since the cost of the carbon fiber is very high, it is not easy to apply and the carbon fiber is not suitable for use in a place where a high voltage current flows as a conductor.
In addition, the glass fiber has a relatively low price as compared with the carbon fiber and has an advantage as a low-elasticity material. However, there is a problem in workability due to glass dust during the production, cutting and construction of glass fiber, However, it has been known to affect the environment at the time of disposal, and in recent years it has been classified as a potential carcinogen and its use has been limited.
In the case of the aramid fiber, the mechanical and mechanical performance of the aramid fiber is considerably lower than that of the glass fiber or carbon fiber.
In addition, the above-mentioned site impregnation reinforcing method is difficult to construct as compared with the reinforcing performance, and quality is greatly influenced by skill and know-how of the worker.
This also causes problems such as lack of ventilation due to the front construction and maintenance difficulty.
On the other hand, the fiberboard reinforcement method has a superior material property, but it has a limitation in the adhesion performance such as peeling of the end due to a mechanism that depends only on the epoxy adhesive to adhere to the object to be reinforced. This method also has problems such as lack of ventilation due to the front construction and maintenance difficulty.
In order to overcome such a problem, Korean Patent No. 10-1204368 discloses a panel for reinforcing and reinforcing concrete structures using basalt fiber.
On the other hand, in order to repair and reinforce the concrete structure, it is necessary to develop a composition having sufficient durability to manufacture such a product, since various materials such as plates, ribs, and panels can be used.
The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a high strength urethane resin which can be impregnated into a composite material obtained by drawing basalt fiber, glass fiber, carbon fiber or metal fiber, And strength and the like, and a product for repair and reinforcement using the FRP composition, for example, a plate, a rebar and / or a panel.
It is another object of the present invention to provide a method of reinforcing and reinforcing concrete structures by using a product using the FRP composition.
The present invention
Based on 100 parts by weight of urethane resin,
5 to 50 parts by weight of a filler consisting of aluminum hydroxide, calcium carbonate or a mixture thereof;
70 to 90 parts by weight of a molded product obtained by drawing basalt fiber, aramid fiber, glass fiber, carbon fiber or a mixture of at least one selected from the foregoing;
5 to 20 weight percent of a curing agent which is a paratoluene sulfonic acid, a phenol sulfonic acid, a t-butyl peroxy benzoate, a phthalic anhydride, an aromatic polyamine, a bis- (4-t-butylcyclohexane) peroxydicarbonate, a polymercaptan, part;
1 to 10 parts by weight of an adhesion promoter; And
Reinforced FRP composition comprising 3 to 15 parts by weight of a water-reducing festival,
Further comprising 2 to 8 parts by weight of tetraethylene pentamine based on 100 parts by weight of the urethane resin,
Further comprising 5 to 30 parts by weight of a deformation preventing agent based on 100 parts by weight of the urethane resin,
Further comprising 1 to 5 parts by weight of magnesium silicate based on 100 parts by weight of the urethane resin,
Further comprising 10 to 50 parts by weight of an acrylic copolymer formed by polymerization of an acrylic monomer, 4-cyanovaleric acid, and glycidyl methacrylate (GMA) based on 100 parts by weight of a urethane resin,
Further comprising 0.5 to 5 parts by weight of a curing accelerator based on 100 parts by weight of the urethane resin,
Further comprising 2 to 10 parts by weight of polyvinyl alcohol based on 100 parts by weight of the urethane resin,
Wherein the aminomethyl polydimethyl siloxane further comprises 3 to 10 parts by weight based on 100 parts by weight of the urethane resin.
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In addition,
A drawing-forming step of drawing a basalt fiber, an aramid fiber, a glass fiber, a carbon fiber or a mixture of at least one selected from the foregoing to produce a molded product;
5 to 50 parts by weight of a filler consisting of aluminum hydroxide, calcium carbonate or a mixture thereof, based on 100 parts by weight of urethane resin, paratoluenesulfonic acid, phenolsulfonic acid, t-butylperoxyl benzoate, phthalic anhydride, aromatic polyamine, bis- (4-t-butylcyclohexane) peroxydicarbonate, polymercaptan or a mixture thereof, from 1 to 10 parts by weight of an adhesion promoter, and from 3 to 15 parts by weight of a water-reducing agent, tetraethylene Pentamine in an amount of 2 to 8 parts by weight based on 100 parts by weight of the urethane resin, and further comprising 5 to 30 parts by weight of a deformation preventing agent based on 100 parts by weight of the urethane resin, wherein the magnesium silicate is contained in an amount of 1 to 100 parts by weight, And further comprising 5 parts by weight of an acrylic monomer, 4-cyanovaleric acid, and glycidyl methacrylate (GMA) And 10 to 50 parts by weight based on 100 parts by weight of the urethane resin, wherein the curing accelerator is further added in an amount of 0.5 to 5 parts by weight based on 100 parts by weight of the urethane resin, 100 parts by weight of the polyvinyl alcohol is mixed with 100 parts by weight of the urethane resin, By weight based on 100 parts by weight of urethane resin, and 70 to 90 parts by weight of the extrudate produced in the drawing-forming step is impregnated with the mixture, A FRP composition manufacturing step of producing a FRP composition for repair and reinforcement in the form of a drawn-out molding;
Arranging the base surface of the concrete structure to be installed with the FRP composition for repair and reinforcement made in the form of the above-mentioned pull-out molding;
Attaching and fixing a FRP composition for repair and reinforcement, which is in the form of a pultrusion molding, to the base surface of the concrete structure;
Sealing the surface of the FRP composition for maintenance and reinforcement made of the above-mentioned draw-out material and the base surface of the concrete structure with a sealing material; And
Reinforcing FRP composition in the form of a pull-out mold, and confirming the filling of the epoxy resin through the check pipe while filling the epoxy resin through the injection pipe, and repairing and reinforcing the concrete structure Provide the construction method.
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The present invention according to the present invention has been made to solve the above problems, and it is an object of the present invention to provide a high strength urethane resin which can be impregnated into a composite material obtained by drawing basalt fiber, glass fiber, carbon fiber, By providing the FRP composition improved in durability, impact resistance and strength, the moldability is good, the production process is simple, and the production cost is low.
Hereinafter, the present invention will be described in detail.
In one aspect, the present invention relates to a curable composition comprising 5 to 50 parts by weight of a filler comprising aluminum hydroxide, calcium carbonate or a mixture thereof, based on 100 parts by weight of a urethane resin; 70 to 90 parts by weight of a molded product obtained by drawing basalt fiber, aramid fiber, glass fiber, carbon fiber or a mixture of at least one selected from the foregoing; 5 to 20 parts by weight of a curing agent; 1 to 10 parts by weight of an adhesion promoter; And 3 to 15 parts by weight of a water-reducing finishing agent.
In another aspect, the present invention provides a method for producing a molded article, comprising: a drawing-forming step of drawing a basalt fiber, an aramid fiber, a glass fiber, a carbon fiber or a mixture of at least one selected from the above; 5 to 50 parts by weight of a filler consisting of aluminum hydroxide, calcium carbonate or a mixture thereof, 5 to 20 parts by weight of a curing agent, 1 to 10 parts by weight of an adhesion promoter and 3 to 15 parts by weight of a water-reducing agent based on 100 parts by weight of a urethane resin And 70 to 90 parts by weight of the extrudate produced in the drawing and forming step is impregnated into the mixture to prepare a FRP composition for repair and reinforcement in the form of a pellet; Arranging the base surface of the concrete structure to be installed with the FRP composition for repair and reinforcement made in the form of the above-mentioned pull-out molding; Attaching and fixing a FRP composition for repair and reinforcement, which is in the form of a pultrusion molding, to the base surface of the concrete structure; Sealing the surface of the FRP composition for maintenance and reinforcement made of the above-mentioned draw-out material and the base surface of the concrete structure with a sealing material; And a step of installing an injection pipe and a check pipe in the FRP composition for repair and reinforcement made in the form of the above-mentioned draw-out mold, and confirming the filling of the epoxy resin through the check pipe while filling the epoxy resin through the injection pipe. Provide reinforcement method.
The FRP composition according to the present invention, specifically the FRP composition for repairing and reinforcing a concrete structure, is obtained by impregnating a composite material obtained by drawing basalt fiber, glass fiber, carbon fiber or metal fiber with a high strength urethane resin mixture to repair and / Is not particularly limited as long as it can improve mechanical performance and / or impact resistance by applying it to concrete, for example, a concrete structure.
The FRP composition according to the present invention is a composite material obtained by drawing basalt fiber, glass fiber, carbon fiber, metal fiber or the like, and then molding a molded article such as a plate, a rebar and / So that the mixture is impregnated.
The urethane resin according to the present invention is not particularly limited as long as it is a urethane resin that is commonly used in the art, but it is preferably a composite material, particularly a composite material obtained by drawing a basalt fiber, glass fiber, carbon fiber, And may be formed in a solution form so as to be easily impregnated in a molded product.
At this time, the contents of the FRP composition, specifically the urethane resin and other components constituting the FRP composition for repairing and reinforcing concrete structures, are based on 100 parts by weight of the urethane resin.
The filler according to the present invention is intended to improve the dimensional stability and abrasion resistance, and any filler having such a purpose may be used, and the filler is preferably used in an amount of 5 to 50 parts by weight based on 100 parts by weight of the urethane resin.
Preferred fillers are aluminum hydroxide, calcium carbonate or mixtures thereof.
The shaped article according to the present invention refers to the shape of a product for repairing and reinforcing a concrete structure, specifically, the shape of a product, and may include a plate, a rebar, and / or a panel shape depending on its shape.
At this time, the molded product is impregnated with the components constituting the remaining FRP composition except for the molded product, and is manufactured as a final product.
A preferable molded product includes basalt fiber, aramid fiber, glass fiber, carbon fiber, or a mixture of at least one selected from the foregoing, and the amount of use is preferably 70 to 90 parts by weight based on 100 parts by weight of the urethane resin.
Here, the basalt fiber has chemical properties similar to those of glass fiber. In other words, both glass and basalt are amorphous materials based on silica.
As the use of glass fiber is diversified, the annual average annual production amount reaches about 3 million tons.
In addition, there are various kinds of the above-mentioned glass fiber, but glass fiber (E glass) is a main product when it is based on the amount of water.
Compared to ordinary glass fibers and basalt fibers, glass fibers are composed of various components and have a density as low as 2.6 to 2.7 g / cm. However, basalt fibers have high strength and high heat resistance, and their functions are excellent when used as a composite material.
In particular, the basalt fiber can be used for various purposes because of economical efficiency (low cost) required for reinforcing the strength.
Table 1 shows the results of comparing the physical properties of the basalt fiber and the conventional glass fiber according to the present invention.
In addition, the carbon fibers are high in strength and superior in strength to basalt fibers. However, the modulus of elasticity is 1.5%, which is much lower than that of basalt fiber (4.2%).
The strength properties of the fibers are very important in the choice of application. The strength per 1 denier of carbon fiber is 170 cN / tex, which is much higher than that of 100 cN / tex of basalt fiber. However, the strength per unit area is 3.0 GPa, which is not much different from 2.7 GPa.
As a result, basalt fibers are characterized by moderate strength (strength per unit area), high oxidation resistance, electrical insulation, easy processability and raw material procurement, and very low prices.
In this respect, the advantage of carbon fiber is limited to low density and high strength, and it is advantageous to have basalt fiber in comparison with carbon fiber which is expensive and in short supply.
Meanwhile, the aramid fiber according to the present invention is formed into a filament form used for making a fabric in a yarn form, a pulp form used for making a product in a powder form, a yarn thickness can be freely adjusted, There is a staple shape which is subjected to a weak grinding process for use in blending with a yarn. In the present invention, it may be applied to any one of the double-selected shapes as required.
On the other hand, the aramid fiber has a single shape and its length is 1 to 100 mm, preferably 3 to 40 mm, and the diameter or thickness of the cross section is 1 to 50, preferably 10 to 40. The length and diameter or thickness of the aramid may be adjusted to the optimum range depending on the quality, durability, tensile strength, flexural strength and toughness of the desired FRP composition, and it is preferable to use a single length and a single diameter for maintaining a single shape .
The single shape in the aramid means that fibers having different lengths or diameters are not mixed, and it is preferable that the aramid has a single shape having a single length and a single diameter in terms of dispersibility in the FRP composition.
The aramid has an intensity of 8.5 g / d or more, preferably 9.5 g / d or more as measured by a gauge length of 5 mm, an elongation of 60 to 135% as measured by a gauge length of 5 mm, Can be from 75 to 115%.
In the present invention, if the strength and elongation of the aramid are out of the above range, the effect of improving the cracking resistance of the FRP composition may be weakened.
The aramid may have a relative viscosity (RV) of 2.9 or more, and preferably 3.2 or more. If the relative viscosity (RV) of the aramid is lower than the above range, the strength and abrasion resistance of the fiber itself may deteriorate.
In the present invention, the aramid may have a fineness of 1 to 10 denier, preferably 1.5 to 5 denier.
If the fineness is less than 1 denier, the surface area of the fiber increases and the contact area increases. However, the strength of the fiber itself may be lowered and the dispersibility of the fiber in the FRP composition may be lowered. On the other hand, when the fineness is more than 10 denier, the number of fibers per unit area of the FRP composition is decreased, and there is a risk that the fragile portion is relatively formed in the FRP composition.
In a particular embodiment, the aramid fibers according to the present invention may comprise a dispersed agent coated form.
The aramid coated with the dispersant has an advantage of being excellent in tensile strength, abrasion resistance, durability, etc. Therefore, when mixed with the FRP composition, the aramid inherent characteristics as described above can be imparted to the FRP composition, Aramid can improve insulation performance due to its low thermal conductivity.
In another specific embodiment, the aramid fibers according to the present invention may be coated with a coating solution comprising an ester-based lubricant and a nonionic surfactant on the surface thereof, .
Considering the effect of improving the dispersibility and the bonding strength of the aramid, the coating amount of the coating solution is preferably 0.5 to 3% by weight based on the total weight of the aramid, but is not limited thereto.
The curing agent according to the present invention is for curing the FRP composition, and any curing agent conventionally used in the art may be used for this purpose.
Preferable curing agents include para-toluene sulfonic acid (PTSA), phenolsulfonic acid, tert-butylperoxy benzoate, TBPB, phthalic acid anhydride, aromatic polyamines, bis- (4-t-butylcyclohexane) peroxydicarbonate, polymercaptan, or a mixture thereof is preferably used, and the amount of use is preferably 5 to 20 parts by weight based on 100 parts by weight of the urethane resin.
In a specific embodiment, the FRP composition according to the present invention may further comprise a curing accelerator consisting of metal salt cobalt, dimethyl acrylamide or a mixture thereof for faster curing, 0.5 to 5 parts by weight based on 100 parts by weight of urethane resin.
The adhesion promoting agent according to the present invention can be applied to a product made of FRP composition, for example, a plate, a rebar and / or a panel, etc., by using an adhesive such as an epoxy resin for adhesion to a concrete structure for repairing and / It is possible to more easily adhere.
As a preferable adhesion promoter, it is preferable to use an acrylate-based adhesion promoter, for example, hydroxyethyl acryloyl phosphate, hydroxyethyl methacrylate phosphate or the like, and the amount thereof is preferably 1 to 10 wt% based on 100 wt% It is recommended to wife.
The water-reducing agent according to the present invention is intended to prevent the other components from being shrunk after impregnation into the draw-forming material constituting the FRP composition, and is not particularly limited as long as it is a commonly used water-reducing agent in the art, It is preferable to use an acetate-based water-reducing agent, a polyester-based water-reducing agent, and a water-reducing agent composed of an unsaturated polyester resin.
The amount of the water-reducing agent to be used may vary depending on the user's choice, but it is recommended that the amount of the water-reducing agent be 3 to 15 parts by weight based on 100 parts by weight of the urethane resin.
As a specific aspect, the FRP composition according to the present invention, specifically the FRP composition for repairing reinforced concrete structures, is used to increase the strength of the FRP composition applied for repair and / or reinforcement and to provide bonding strength, And 5 to 30 parts by weight of a polyamide fiber reinforcing material based on 100 parts by weight of the urethane resin.
The polyamide fiber reinforcement is added to prevent cracking and toughness of the FRP composition.
The polyamide fiber reinforcing material includes polyamide (nylon) 6, polyamide (nylon) 66, or a mixture thereof.
The polyamide is a relatively inactive material and is known to be highly resistant to various oil / inorganic materials including strong bases.
In another specific embodiment, the FRP composition according to the present invention may contain methyl methacrylate (MMA) on the basis of 100 parts by weight of a urethane resin in order to maintain excellent adhesion and mechanical properties and to prevent cracking and drop- 5 to 15 parts by weight.
Wherein the methyl methacrylate comprises 49 to 70% by weight of a low viscosity methyl methacrylate (MMA) resin having a viscosity of 10 to 1,000 cps, 20 to 50% of high viscosity methyl methacrylate (MMA) having a viscosity of 2,000 to 20,000 cps, And 1 to 10% by weight of a mixture of at least one selected from styrene isoprene styrene (SIS), styrene butadiene rubber (SBR), and styrene butadiene styrene (SBS) is mixed with a methyl methacrylate mixture obtained by mixing ethylene / May be used.
If the content of SIS, SBR and / or SBS is less than 1 wt%, cracks may be caused due to a decrease in impact resistance due to a strong coating film upon application. When the content exceeds 10 wt%, a modified methyl methacrylate resin The viscosity of the composition may be increased, resulting in problems in workability.
In another specific embodiment, the FRP composition according to the present invention may further contain 5 to 30 parts by weight of an anti-strain agent based on 100 parts by weight of the urethane resin in order to reduce plastic deformation.
It is recommended that suitable antidegradants include polyethylene, polybutene, impact polystyrene, polypropylene or mixtures thereof.
If the amount of the antifriction agent is less than 5 parts by weight, the effect of preventing deformation is insignificant. When the amount of the antifriction agent is more than 30 parts by weight, the FRP composition is used to produce a product, And the like.
In another specific embodiment, the FRP composition according to the present invention is characterized in that the FRP composition according to the present invention has a strong adhesion property, water resistance, water permeability, oxygen permeability, ion permeability, electrical insulation, chemical resistance, mechanical And may further include 10 to 50 parts by weight of an acrylic copolymer based on 100 parts by weight of urethane resin to provide properties (elasticity, glass transition temperature, stress relaxation) and the like.
The preferred acrylic copolymers are preferably those formed by polymerization of acrylic monomers, 4-cyanovaleric acid, glycidyl methacrylate (GMA), and are preferably acrylate copolymers copolymer.
At this time, it is preferable to use butyl acrylate (BAM), glycidyl methacrylate (GMA) or a mixture thereof as the acrylic monomer.
In another specific embodiment, the FRP composition according to the present invention may further comprise polyvinyl alcohol in order to enhance the initial adhesive strength. The polyvinyl alcohol not only improves the dispersibility of the components of the FRP composition, Tacky property is also increased to improve the initial adhesive force, thereby reducing the defective rate of floating phenomenon and distortion.
The amount of the polyvinyl alcohol used is 2 to 10 parts by weight based on 100 parts by weight of the urethane resin. When the polyvinyl alcohol is 2 parts by weight or less, the effect is insignificant. When the amount is 10 parts by weight or more, But also the FRP composition may have a bad influence on the weatherability and the like, which is not preferable.
In another specific embodiment, the FRP composition according to the present invention may further comprise 2 to 8 parts by weight of tetraethylenepentamine (TEPA) based on 100 parts by weight of a urethane resin, wherein the tetraethylenepentamine is a kind of polyamine , The curing speed and the viscosity of the FRP composition are controlled. When the amount is less than 2 parts by weight, the effect is insignificant. When the amount is more than 8 parts by weight, the amount is excessively excessive, which is not economical.
In another particular embodiment, the FRP composition according to the present invention may further comprise octyltriethoxysilane to improve the adhesion.
The octyltriethoxysilane may be used in the form of a monomer. The molecular weight of the monomer is not particularly limited, but is preferably 150 to 450 Da, and the amount of the octyltriethoxysilane used is 1 to 10 parts by weight based on 100 parts by weight of the urethane resin .
In another specific embodiment, the FRP composition according to the present invention further comprises an amino-functional siloxane to effectively cure at room temperature and to provide improved properties such as heat resistance, low temperature performance, chemical resistance, solvent resistance and oil resistance .
The amino-containing siloxane is not particularly limited, and examples thereof include aminomethylpolydimethylsiloxane. The amount of the amino-containing siloxane used is preferably 3 to 10 parts by weight based on 100 parts by weight of the urethane resin.
In another specific embodiment, the FRP composition according to the present invention may further comprise magnesium silicate in an amount of 1 to 5 parts by weight based on 100 parts by weight of the urethane resin for prolonging the life of the FRP composition.
Since the magnesium silicate has excellent chemical resistance, chemical resistance and weathering resistance, if it is included in the FRP composition, the life of the magnesium silicate is extended due to the above characteristics.
In another specific embodiment, the FRP composition according to the present invention may further comprise 1 to 5 parts by weight of a shrinkage reducing agent based on 100 parts by weight of the urethane resin.
The shrinkage reducing agent is added to prevent drying shrinkage when a product such as a plate, a rebar, or a panel is manufactured by using the FRP composition, and at least one selected from a polyether type, ethylene glycol, and propylene glycol But the present invention is not limited thereto, and a kind commonly used in the art can be used.
In another specific embodiment, the FRP composition according to the present invention may further comprise 3 to 10 parts by weight of a diluent based on 100 parts by weight of the urethane resin.
A preferred diluent is a styrene monomer, vinyl acetate (VAc) or methyl acrylate.
In another specific embodiment, the FRP composition according to the present invention may further comprise 1 to 10 parts by weight of a mold-release agent based on 100 parts by weight of the urethane resin.
It is recommended to use zinc stearate as the preferred molding-release agent.
The repair and strengthening method using the FRP composition according to the present invention having such a construction will be described as follows. Hereinafter, the repair and reinforcement method is not limited to the FRP composition, and any repair or reinforcement method using conventional FRP compositions in the art may be used.
The repair and strengthening method using the FRP composition according to the present invention comprises a drawing and forming step of producing a molded product by drawing basalt fiber, aramid fiber, glass fiber, carbon fiber or a mixture of at least one selected from the above;
5 to 50 parts by weight of a filler consisting of aluminum hydroxide, calcium carbonate or a mixture thereof, 5 to 20 parts by weight of a curing agent, 1 to 10 parts by weight of an adhesion promoter and 3 to 15 parts by weight of a water-reducing agent based on 100 parts by weight of a urethane resin And 70 to 90 parts by weight of the extrudate produced in the drawing and forming step is impregnated into the mixture to prepare a FRP composition for repair and reinforcement in the form of a pellet;
Arranging the base surface of the concrete structure to be installed with the FRP composition for repair and reinforcement made in the form of the above-mentioned pull-out molding;
Attaching and fixing a FRP composition for repair and reinforcement, which is in the form of a pultrusion molding, to the base surface of the concrete structure;
Sealing the surface of the FRP composition for maintenance and reinforcement made of the above-mentioned draw-out material and the base surface of the concrete structure with a sealing material; And
Reinforcing FRP composition in the form of a pull-out mold, and confirming the filling of the epoxy resin through the check pipe while filling the epoxy resin through the injection pipe.
Here, the sealing material is not particularly limited as long as it is a sealing material ordinarily used in the art, but silicon, mortar, concrete or a mixture thereof can be preferably used.
The final shape of the product for repair and reinforcement of the concrete structure is determined according to the shape of the draw-out molding, in the form of a plate, a rebar or a panel.
Hereinafter, the present invention will be described in detail by way of examples. However, the following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
[Example 1]
The basalt fiber was pulled out to produce a plate shaped product.
Subsequently, a mixture of 100 g of urethane resin, 25 g of aluminum hydroxide, 10 g of para-toluene sulfonic acid, 5 g of hydroxyethyl acryloyl phosphate and 10 g of a water-reducing agent composed of an unsaturated polyester resin was added to the drawn- To prepare an FRP composition.
[Example 2]
The procedure of Example 1 was repeated except that the basalt fiber was pulled out to produce a plate-like molded product, and a basalt fiber was pulled out to produce a rib-shaped molded product.
[Example 3]
The same procedure as in Example 1 was carried out except that basalt fiber was pulled out and basalt fiber was pulled out instead of producing a plate-shaped molding to produce a panel-shaped molding.
[Example 4]
The same procedure as in Example 1 was carried out except that basalt fibers and aramid fibers were mixed in a weight ratio of 1: 1 instead of basalt fibers.
[Example 5]
Except that basalt fibers, carbon fibers and aramid fibers were mixed in a weight ratio of 1: 1: 1 instead of basalt fibers.
[Example 6]
The procedure of Example 1 was repeated except that 15 g of a polyamide fiber reinforcing material was added to the FRP composition.
[Example 7]
60% by weight of low viscosity methyl methacrylate resin, 39% by weight of high viscosity methyl methacrylate (MMA) having a viscosity of about 10,000 cps, and styrene isoprene styrene (SIS) were added to the FRP composition in the same manner as in Example 1, 1% by weight of methyl methacrylate was further added.
[Example 8]
The same procedure as in Example 1 was carried out except that 15 g of a deformation preventing agent containing polybutene was further added to the FRP composition.
[Example 9]
The same procedure as in Example 1 was carried out except that 25 g of butyl acrylate was further added to the FRP composition.
[Example 10]
The procedure of Example 1 was repeated except that 4 g of tetraethylene pentamine was further added to the FRP composition.
[Example 11]
The procedure of Example 1 was repeated except that 5 g of octyltriethoxysilane was added.
[Example 12]
The shrinkage-reducing agent 3 g composed of propylene glycol was further added to the FRP composition in the same manner as in Example 1.
[Example 13]
The same procedure as in Example 1 was carried out except that 5 g of a diluent composed of a styrene monomer was further added to the FRP composition.
[Example 14]
The procedure of Example 1 was repeated except that 5 g of zinc stearate was further added to the FRP composition.
[Experiment]
The mechanical properties of the products prepared using the compositions prepared according to the examples were measured.
The results are shown in Table 2.
As shown in Table 2, the FRP compositions prepared according to the Examples showed good compressive strength and bending strength and excellent adhesion.
As described above, those skilled in the art will understand that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the embodiments described above are all illustrative and not restrictive. The scope of the present invention should be construed as being included in the scope of the present invention without departing from the spirit and scope of the present invention as defined by the appended claims and their equivalents.
Claims (8)
5 to 50 parts by weight of a filler consisting of aluminum hydroxide, calcium carbonate or a mixture thereof;
70 to 90 parts by weight of a molded product obtained by drawing basalt fiber, aramid fiber, glass fiber, carbon fiber or a mixture of at least one selected from the foregoing;
5 to 20 weight percent of a curing agent which is a paratoluene sulfonic acid, a phenol sulfonic acid, a t-butyl peroxy benzoate, a phthalic anhydride, an aromatic polyamine, a bis- (4-t-butylcyclohexane) peroxydicarbonate, a polymercaptan, part;
1 to 10 parts by weight of an adhesion promoter; And
Reinforced FRP composition comprising 3 to 15 parts by weight of a water-reducing festival,
Further comprising 2 to 8 parts by weight of tetraethylene pentamine based on 100 parts by weight of the urethane resin,
Further comprising 5 to 30 parts by weight of a deformation preventing agent based on 100 parts by weight of the urethane resin,
Further comprising 1 to 5 parts by weight of magnesium silicate based on 100 parts by weight of the urethane resin,
Further comprising 10 to 50 parts by weight of an acrylic copolymer formed by polymerization of an acrylic monomer, 4-cyanovaleric acid, and glycidyl methacrylate (GMA) based on 100 parts by weight of a urethane resin,
Further comprising 0.5 to 5 parts by weight of a curing accelerator based on 100 parts by weight of the urethane resin,
Further comprising 2 to 10 parts by weight of polyvinyl alcohol based on 100 parts by weight of the urethane resin,
Wherein the aminomethyl polydimethyl siloxane further comprises 3 to 10 parts by weight based on 100 parts by weight of the urethane resin.
5 to 50 parts by weight of a filler consisting of aluminum hydroxide, calcium carbonate or a mixture thereof, based on 100 parts by weight of urethane resin, paratoluenesulfonic acid, phenolsulfonic acid, t-butylperoxyl benzoate, phthalic anhydride, aromatic polyamine, bis- (4-t-butylcyclohexane) peroxydicarbonate, polymercaptan or a mixture thereof, from 1 to 10 parts by weight of an adhesion promoter, and from 3 to 15 parts by weight of a water-reducing agent, tetraethylene Pentamine in an amount of 2 to 8 parts by weight based on 100 parts by weight of the urethane resin, and further comprising 5 to 30 parts by weight of a deformation preventing agent based on 100 parts by weight of the urethane resin, wherein the magnesium silicate is contained in an amount of 1 to 100 parts by weight, And further comprising 5 parts by weight of an acrylic monomer, 4-cyanovaleric acid, and glycidyl methacrylate (GMA) And 10 to 50 parts by weight based on 100 parts by weight of the urethane resin, wherein the curing accelerator is further added in an amount of 0.5 to 5 parts by weight based on 100 parts by weight of the urethane resin, 100 parts by weight of the polyvinyl alcohol is mixed with 100 parts by weight of the urethane resin, By weight based on 100 parts by weight of urethane resin, and 70 to 90 parts by weight of the extrudate produced in the drawing-forming step is impregnated with the mixture, A FRP composition manufacturing step of producing a FRP composition for repair and reinforcement in the form of a drawn-out molding;
Arranging the base surface of the concrete structure to be installed with the FRP composition for repair and reinforcement made in the form of the above-mentioned pull-out molding;
Attaching and fixing a FRP composition for repair and reinforcement, which is in the form of a pultrusion molding, to the base surface of the concrete structure;
Sealing the surface of the FRP composition for maintenance and reinforcement made of the above-mentioned draw-out material and the base surface of the concrete structure with a sealing material; And
Reinforcing FRP composition in the form of a pull-out mold, and confirming the filling of the epoxy resin through the check pipe while filling the epoxy resin through the injection pipe, and repairing and reinforcing the concrete structure Method.
Wherein the sealing material is silicon, mortar, concrete or a mixture thereof.
Wherein the draw-out mold is in the form of a plate, a rebar or a panel.
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| KR1020150136178A KR101667530B1 (en) | 2015-09-25 | 2015-09-25 | FRP Composition for Reinforcement of Concrete Structure Using Complex Material Manufactured by Drawing of Basalt Fiber, Glass Fiber, Carbon Fiber and Metal Fiber Used in High Strength Urethane Resin and Reinforcement of Concrete Structure Using Thereof |
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| KR1020150136178A KR101667530B1 (en) | 2015-09-25 | 2015-09-25 | FRP Composition for Reinforcement of Concrete Structure Using Complex Material Manufactured by Drawing of Basalt Fiber, Glass Fiber, Carbon Fiber and Metal Fiber Used in High Strength Urethane Resin and Reinforcement of Concrete Structure Using Thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101734136B1 (en) * | 2016-12-27 | 2017-05-24 | (주)알에스건설산업 | Reinforcement Composition Using Basalt Fiber and Constructing Methods Using Thereof |
| KR101767576B1 (en) * | 2017-04-20 | 2017-08-11 | 주식회사 삼진비티 | An Adhesive Composition for Reinforcement of Complex FRP formed Space and Construction Methods Using Thereof |
| KR101835426B1 (en) | 2017-11-21 | 2018-03-08 | 조용상 | A method of reinforcing and reinforcing concrete structures using a FRP composition Made of Complex Fiber Material Manufactured by Drawing with Binder Having Epoxy Resin and Acid Anhydride-Hardener |
| KR101830099B1 (en) | 2017-11-21 | 2018-03-29 | 조용상 | FRP Composition Made of Complex Fiber Material Manufactured by Drawing with Binder Having Epoxy Resin and Acid Anhydride-Hardener |
| CN108240233A (en) * | 2017-12-18 | 2018-07-03 | 固岩科技发展有限公司 | A kind of method based on cementitious material added metal mine made of cement synergist |
| KR20180102757A (en) | 2017-03-08 | 2018-09-18 | 충남대학교산학협력단 | Pull-out test specimen, Method for manufacturing specimen, and Pull-out tester |
| KR101907917B1 (en) * | 2018-04-06 | 2018-10-15 | 이광진 | Repairing and reinforcing structure of concrete building, and the method for the same |
| CN108794038A (en) * | 2018-06-06 | 2018-11-13 | 苏州宏久航空防热材料科技有限公司 | A kind of preparation method of the inexpensive carbon fiber reinforced carbon matrix composite material based on in-situ polymerization |
| KR101992983B1 (en) | 2019-03-26 | 2019-09-30 | 주식회사 제이에스기술 | Photocurable fiber reinforcing sheet and manufacturing method thereof |
| KR102247034B1 (en) * | 2020-10-08 | 2021-04-30 | 주식회사 에코이앤씨 | Textile sheet and reinforcement panel for concrete structure and method of repair and reinforcement method of structure using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101734136B1 (en) * | 2016-12-27 | 2017-05-24 | (주)알에스건설산업 | Reinforcement Composition Using Basalt Fiber and Constructing Methods Using Thereof |
| KR20180102757A (en) | 2017-03-08 | 2018-09-18 | 충남대학교산학협력단 | Pull-out test specimen, Method for manufacturing specimen, and Pull-out tester |
| KR101767576B1 (en) * | 2017-04-20 | 2017-08-11 | 주식회사 삼진비티 | An Adhesive Composition for Reinforcement of Complex FRP formed Space and Construction Methods Using Thereof |
| KR101835426B1 (en) | 2017-11-21 | 2018-03-08 | 조용상 | A method of reinforcing and reinforcing concrete structures using a FRP composition Made of Complex Fiber Material Manufactured by Drawing with Binder Having Epoxy Resin and Acid Anhydride-Hardener |
| KR101830099B1 (en) | 2017-11-21 | 2018-03-29 | 조용상 | FRP Composition Made of Complex Fiber Material Manufactured by Drawing with Binder Having Epoxy Resin and Acid Anhydride-Hardener |
| CN108240233A (en) * | 2017-12-18 | 2018-07-03 | 固岩科技发展有限公司 | A kind of method based on cementitious material added metal mine made of cement synergist |
| KR101907917B1 (en) * | 2018-04-06 | 2018-10-15 | 이광진 | Repairing and reinforcing structure of concrete building, and the method for the same |
| CN108794038A (en) * | 2018-06-06 | 2018-11-13 | 苏州宏久航空防热材料科技有限公司 | A kind of preparation method of the inexpensive carbon fiber reinforced carbon matrix composite material based on in-situ polymerization |
| CN108794038B (en) * | 2018-06-06 | 2021-08-03 | 苏州宏久航空防热材料科技有限公司 | Preparation method of low-cost carbon fiber reinforced carbon-based composite material based on in-situ polymerization |
| KR101992983B1 (en) | 2019-03-26 | 2019-09-30 | 주식회사 제이에스기술 | Photocurable fiber reinforcing sheet and manufacturing method thereof |
| KR102247034B1 (en) * | 2020-10-08 | 2021-04-30 | 주식회사 에코이앤씨 | Textile sheet and reinforcement panel for concrete structure and method of repair and reinforcement method of structure using the same |
| CN113665190A (en) * | 2021-09-01 | 2021-11-19 | 吉土超砼(山东)新材料技术有限公司 | High-ductility fiber-reinforced polymer rib and preparation method thereof |
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