KR101870858B1 - A Buffer Material Composition Comprising Epoxy Resin and Seismic Reinforcing Methods of Concrete Structure Using Thereof - Google Patents
A Buffer Material Composition Comprising Epoxy Resin and Seismic Reinforcing Methods of Concrete Structure Using Thereof Download PDFInfo
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- KR101870858B1 KR101870858B1 KR1020180008013A KR20180008013A KR101870858B1 KR 101870858 B1 KR101870858 B1 KR 101870858B1 KR 1020180008013 A KR1020180008013 A KR 1020180008013A KR 20180008013 A KR20180008013 A KR 20180008013A KR 101870858 B1 KR101870858 B1 KR 101870858B1
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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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- 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
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- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
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- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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Abstract
Description
The present invention relates to a cushioning material composition comprising an epoxy resin, and more particularly, to a cushioning material composition containing an epoxy resin injected into a steel rod (apparatus) of a pressurized type breathing system used for seismic strengthening of a structure, And an earthquake-proof reinforcement method.
Recently, in Korea, a magnitude 3.7 earthquake occurred in the coast of Baekryeong Island, Incheon, and a magnitude of 2.8 earthquake 4.8 earthquake was detected 15 times in the month of May 2013, and a magnitude 5.5 earthquake occurred in Gyeongju in 2016, Academic opinion is dominant that it is not a safe zone.
Particularly, since 1970s, Korea has been rapidly undergoing economic growth, and with the three-dimensional development of large cities, many public facilities such as urban railways, electric power districts, communication districts, underground roads, These earth structures are not subject to earthquake excitation because earthquake excitation is not caused due to vibration of structures due to earthquake excitation.
However, earthquake damage cases of underground structures such as the collapse of the urban railway history in 1995 when the Great Hanshin Earthquake occurred in Kobe was proven. In Korea, since the first earthquake design for general structures was mandatory in 1988, most of the underground structures designed before 1988 did not secure seismic safety because most earthquake - resistant design was not taken into consideration.
Especially, since many underground structures are located in the underground of the city, the damages caused by earthquake damage are very large and restoration is very difficult. In order to secure the safety of such an underground structure in order to secure the safety, it is necessary to provide a reinforcement method that can effectively reinforce the construction cost because it requires a large construction cost and an indirect cost.
Furthermore, due to the nature of the underground box structure, it is inevitable for large-scale construction such as earthquake to perform seismic reinforcement from the outside. Also, even if construction is carried out inside the box, it is very difficult to strengthen the seismic reinforcement due to many limitations such as construction limit, construction time, construction space, and manpower construction.
In order to solve this problem, many reinforcement methods for underground box structures have been proposed in Korea [Chung, J.S., Moon, I.G., Kim, J.G., M., Lee, J.H., Min, D.H. (2015.05) The Earthquake Resistant Reinforcement Method of the Existing Urban Railway, The Korean Society for Railway, PP.32-33], [Song, SG, Ann, HJ, Lee, JH, An, SM, Kong, And most of the technologies developed in Korea have been applied to FRP materials such as panels, sheets, etc., which have been proposed in the past. These methods are to increase the section strength by attaching the stiffener to the maximum part of the moment. However, the anchorage reinforcement method is effective for the final moment, but there is a problem in that there is no reinforcing effect in the section where the moment and shear force are insufficient.
Accordingly, in order to overcome the above-described problem, it is necessary to use a more active and efficient pressurized breaching seismic strengthening system as shown in FIG.
Here, a steel bar device for reinforcing the pressurized breech is provided inside the structure shown in Fig.
The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a reinforcing material (steel bar device) applied to a pressurized breaching seismic strengthening method by inserting a cushioning composition having excellent water resistance, strength and long- .
The present invention
Based on 100 parts by weight of an epoxy resin,
5 to 30 parts by weight of calcium sulfoaluminate;
5 to 50 parts by weight of a filler;
10 to 40 parts by weight of fibers;
5 to 20 parts by weight of a curing agent;
0.1 to 10 parts by weight of a silane compound;
1 to 8 parts by weight of a defoaming agent;
0.1 to 10 parts by weight of a dispersant;
0.01 to 4 parts by weight of a re-forming type polymer powder; And
And 3 to 15 parts by weight of a water reducing agent.
In addition,
An actual measurement step of measuring a structure to be subjected to earthquake-proof construction;
A step of producing a steel bar device having an anchor for reinforcing a pressurized press according to a shape of a structure actually measured after completion of the actual measurement step;
A step of piercing a hole to fix an anchor of a steel bar device to a structure to be installed;
A step of installing a steel bar to connect an anchor of the steel bar to the pierced hole;
After the step of installing the steel rods is completed, 5 to 30 parts by weight of calcium sulfoaluminate, 5 to 50 parts by weight of a filler, 10 to 40 parts by weight of fibers, 5 to 20 parts by weight of a curing agent, 0.1 to 10 parts by weight of a silane compound, 1 to 8 parts by weight of a defoaming agent, 0.1 to 10 parts by weight of a dispersant, 0.01 to 4 parts by weight of a re-fired polymer powder, and 3 to 15 parts by weight of a water- An injection step; And
And a curing step of curing the cushioning material after the cushioning material composition injecting step is completed.
Disclosure of the Invention The present invention has been made to overcome the above problems, and it is an object of the present invention to provide a reinforcing member (steel bar device) applied to a pressurized breaching seismic strengthening method, which has an excellent waterproofness, strength and long- .
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an application of a steel bar device in which a cushioning material composition according to the present invention is inserted. FIG.
Hereinafter, the present invention will be described in detail.
In one aspect, the present invention provides a composition comprising 5 to 30 parts by weight of calcium sulfoaluminate, based on 100 parts by weight of an epoxy resin; 5 to 50 parts by weight of a filler; 10 to 40 parts by weight of fibers; 5 to 20 parts by weight of a curing agent; 0.1 to 10 parts by weight of a silane compound; 1 to 8 parts by weight of a defoaming agent; 0.1 to 10 parts by weight of a dispersant; 0.01 to 4 parts by weight of a re-forming type polymer powder; And 3 to 15 parts by weight of a water reducing agent.
According to another aspect of the present invention, there is provided an earthquake-proof structure, A step of producing a steel bar device having an anchor for reinforcing a pressurized press according to a shape of a structure actually measured after completion of the actual measurement step; A step of piercing a hole to fix an anchor of a steel bar device to a structure to be installed; A step of installing a steel bar to connect an anchor of the steel bar to the pierced hole; After the step of installing the steel rods is completed, 5 to 30 parts by weight of calcium sulfoaluminate, 5 to 50 parts by weight of a filler, 10 to 40 parts by weight of fibers, 5 to 20 parts by weight of a curing agent, 0.1 to 10 parts by weight of a silane compound, 1 to 8 parts by weight of a defoaming agent, 0.1 to 10 parts by weight of a dispersant, 0.01 to 4 parts by weight of a re-fired polymer powder, and 3 to 15 parts by weight of a water- An injection step; And a curing step of curing the cushioning material after the cushioning material composition injecting step is completed.
The cushioning material composition according to the present invention, and the cushioning material composition containing the epoxy resin in particular, are injected into a steel bar device used for reinforcing a pressurized bushing of a structure, specifically, a reinforced concrete structure to increase the strength, water resistance and durability Anything can be used as long as it can be done.
The epoxy resin according to the present invention is not particularly limited as long as it is an epoxy resin commonly used in the art.
The content of the remaining components other than the epoxy resin in the cushioning composition according to the present invention is based on 100 parts by weight of the epoxy resin.
The calcium sulfoaluminate according to the present invention is a material for imparting shrinkage compensation, high strength, for example, high compressive strength, bending strength and ultrahigh speed, and any of calcium sulfoaluminate having such a purpose can be used And it is recommended that the amount thereof is 5 to 30 parts by weight based on 100 parts by weight of the epoxy resin.
If the calcium sulfoaluminate is used in an amount of less than 5 parts by weight, the curing rate may decrease. If the calcium sulfoaluminate is used in an amount of more than 30 parts by weight, the volume may expand.
On the other hand, when calcium sulfoaluminate comes into contact with water, the calcium sulfoaluminate reacts instantaneously to generate an ettringite hydrate, so that the compressive strength of the buffer composition can be obtained within several minutes to several hours.
At this time, ultrafine amorphous calcium sulfoaluminate may be used for a quick hydration reaction.
The blast powder of the ultrafine amorphous calcium sulfoaluminate used for increasing hydration reactivity is preferably about 5,000 to 8,000 cm 2 / g.
In a particular embodiment, the calcium sulfoaluminate according to the present invention is comprised of 28 to 62 wt.% Rolled end sludge, 19 to 52 wt.% Dolomite sludge, and 9 to 20 wt.% Gypsum plaster, By weight and the balance of 5 to 20% by weight.
Thereafter, the mixture is maintained at a firing temperature of 1,000 to 1,300 DEG C for at least one hour in a firing furnace, followed by air cooling to produce calcium sulfoaluminate. At this time, when the calcination temperature is low or the content of dolomite sludge is high, the amount of unreacted lime is increased to cause expansion, so there is a risk of collapse and destruction. When the calcination temperature is high or the amount of limestone is at least calcium sulphoaluminate The production is small and the desired purpose can not be achieved.
The filler according to the present invention is intended to improve dimensional stability and abrasion resistance. 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 epoxy resin.
Preferred fillers are aluminum hydroxide, calcium carbonate or mixtures thereof.
The fiber according to the present invention is intended to improve the strength and the like of the cushioning composition and is not particularly limited as long as it is a conventional fiber in the art having such a purpose.
Preferred examples of the fiber include basalt fiber, aramid fiber, glass fiber, carbon fiber, and at least one mixture thereof. The amount of the fiber used is preferably 10 to 40 parts by weight based on 100 parts by weight of the epoxy 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.
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 aramid fiber is formed into a filament form used to make a fabric by being pulled out in the form of a thread, a pulp form used to make a product in a powder form, a flexible thickness of the yarn, and a blend with other yarns There is a staple shape subjected to a weak grinding process. In the present invention, it can be applied to any one of the dual selected shapes as needed.
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 탆, preferably 10 to 40 탆. The length and diameter or thickness of the aramid may be adjusted to an optimum range depending on the quality, durability, tensile strength, bending strength and toughness of the desired cushioning composition, and it is preferable to use the single length and the single diameter to maintain a single shape .
The single shape in the aramid means that no fibers having different lengths or diameters are 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 cushioning 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, when the strength and elongation of the aramid are out of the above range, the effect of improving the crack resistance and the like of the cushioning composition can 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 fibers in the buffer composition may be deteriorated. On the other hand, when the fineness is more than 10 denier, the number of fibers per unit area of the cushioning material composition may decrease, and the risk of forming a weak portion in the cushioning material may be relatively increased.
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, and the like. When the aramid is incorporated into the cushioning composition, the aramid inherent characteristics as described above can be imparted to the cushioning composition, Aramid can improve insulation performance due to its low thermal conductivity.
In another specific embodiment, the aramid fiber according to the present invention can be coated with a coating solution containing an ester-based lubricant and a non-ionic surfactant on its surface. Through this coating, the dispersibility in the buffer material composition and the bonding strength with each composition are greatly improved .
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 cushioning 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. The amount of the epoxy resin used is preferably 5 to 20 parts by weight based on 100 parts by weight of the epoxy resin.
The silane compound according to the present invention is excellent in bondability and improved durability. Any silane compound may be used as long as it is an ordinary silane compound having such a purpose. Preferably, perfluoromethoxy silane, Perfluoroalkoxysilane such as perfluoroethoxysilane or tetraalkoxysilane such as tetramethoxysilane or tetraethoxysilane is used as the siloxane oligomer, and trialkoxysilane, tetraalkoxysilane, dialkoxysilane or the It is preferable to use at least one selected mixture, and the amount thereof to be used is preferably 0.1 to 10 parts by weight based on 100 parts by weight of the epoxy resin.
The antifoaming agent according to the present invention is intended to reduce an increase in the amount of air due to the generation of entrained air, and is not particularly limited as long as it is a conventional antifoaming agent in the art having such an object.
Preferred examples of defoaming agents include mineral oil defoaming agents such as kerosene and paraffin, preservative defoaming agents such as animal and vegetable oils, sesame oil, castor oil and castor oil and their alkylene oxide adducts, oleic acid, stearic acid and alkylene oxide adducts thereof, Fatty acid ester type antifoaming agents such as antifoaming agents, glycerin monoricinolate, alkenyl succinic acid liquid, sorbitol monolaurate, sorbitol trioleate, and natural wax, polyoxyalkylene ethers, (poly) oxyalkyl ethers, acetylene ethers, Oxyalkylene antifoaming agents such as (poly) oxyalkylene alkylphosphoric acid esters, (poly) oxyalkylene alkylamines and (poly) oxyalkylene amides, alcohol-based defoaming agents such as octyl alcohol, hexadecyl alcohol, acetylene alcohol, Amide antifoaming agents such as acrylate polyamines and the like, phosphorus tributyl phosphate, sodium octyl phosphate and the like Metal soap defoaming agents such as acid ester defoaming agents, aluminum stearate, calcium oleate, and the like; dimethyl silicone oils, silicone fats, silicone emulsions, and organic modified polysiloxanes (polyorganosiloxanes such as dimethylpolysiloxane). And silicone-based antifoaming agents such as fluorosilicone oil, etc., but is not limited thereto.
The amount of the antifoaming agent to be used is not particularly limited, but is preferably 1 to 8 parts by weight based on 100 parts by weight of the epoxy resin.
Dispersant according to the present invention is intended to impart a polarity to a cushioning composition to improve the adhesion of constituent components of the cushioning composition, to uniformly disperse the compounds, to improve durability, and the like. It is preferable to use any one selected from the group consisting of organic acids, aromatic oils, aliphatic oils, vegetable oils, castor oils, cottonseed oils, mineral oils and mixtures thereof.
The amount of the dispersant to be used is preferably 0.1 to 10 parts by weight based on 100 parts by weight of the epoxy resin.
If the amount of the dispersing agent is less than 0.1 parts by weight, it is not effective. If the amount of the dispersing agent is more than 10 parts by weight, the dispersing agent becomes liquid.
The redispersible polymer powder according to the present invention improves the warpage and adhesion strength by forming a film in the inside of the buffer material composition and improves the water retention, thereby improving the durability against neutralization, chloride ion penetration, freezing and thawing .
The preferred re-firing polymer powder is composed of at least one selected from ethylene vinyl acetate (EVA) or vinyl acetate / vinyl acetate (Va / VeoVa) having an apparent specific gravity of 475 ± g / Mu m and exhibits a particle size distribution of 0.3 to 9 mu m when redispersed in water, and the amount of use is preferably 0.01 to 4 parts by weight based on 100 parts by weight of the epoxy resin.
The water-reducing agent according to the present invention is for preventing shrinkage in a state where the shock-absorbing material composition is inserted into a steel rod as a reinforcing device, and is not particularly limited as long as it is a water-reducing agent conventionally used in the art. Preferably, the polyvinyl acetate- It is advisable to use a festival, a polyester-based water-saving festival, and a water-saving festival made up of unsaturated polyester resins in particular.
The amount of the water-reducing agent to be used may vary depending on the user's choice, but it is recommended that the water-reducing agent be 3 to 15 parts by weight based on 100 parts by weight of the epoxy resin.
The cushioning material composition according to the present invention, and the cushioning material composition comprising the epoxy resin in particular, may further comprise one or more kinds of adducts of the following specific embodiments.
In a specific embodiment, the cushioning material composition according to the present invention, specifically the cushioning material composition comprising an epoxy resin, may further contain 50 to 90 parts by weight of a urethane resin on the basis of 100 parts by weight of an epoxy resin in order to improve strength, water resistance and / .
In another specific embodiment, the cushioning material composition according to the present invention comprises 5 to 30 parts by weight of a polyamide fiber reinforcing material based on 100 parts by weight of an epoxy resin in order to increase the strength of the composition to be applied to seismic strengthening and to provide bonding strength, And the like.
The polyamide fiber reinforcement is added to prevent cracking and increase toughness of the cushioning material composition.
The polyamide fiber reinforcing material includes polyamide (nylon) 6, polyamide (nylon) 66, or a mixture thereof.
In another specific embodiment, the cushioning material composition according to the present invention may contain methyl methacrylate (MMA) on the basis of 100 parts by weight of an epoxy 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 occur due to a decrease in impact resistance. If the content of SIS, SBR, and / or SBS exceeds 10 wt%, problems in workability may occur Therefore, it is not preferable.
In another specific embodiment, the cushioning material composition according to the present invention may further comprise 5 to 30 parts by weight of an anti-strain agent based on 100 parts by weight of the epoxy resin to reduce plastic deformation.
It is recommended that the preferred antidegradant comprises polyethylene, impact polystyrene, polypropylene or mixtures thereof.
In another specific embodiment, the cushioning material 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 an epoxy resin, wherein the tetraethylenepentamine is a kind of polyamine The curing speed and viscosity of the cushioning 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 thereof is excessive and not economical.
In another specific embodiment, the cushioning 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 epoxy resin.
In another specific embodiment, the cushioning material 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 epoxy resin for prolonging the life of the cushioning composition.
Since the magnesium silicate has excellent chemical resistance, chemical resistance and weathering resistance, the life of the magnesium silicate is prolonged by the above characteristics when it is included in the buffer material composition.
In another specific embodiment, the buffer material 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 epoxy resin.
A preferred diluent is a styrene monomer, vinyl acetate (VAc) or methyl acrylate.
In another specific embodiment, the buffer material composition according to the present invention may further comprise 1 to 3 parts by weight of zinc sulfate as 100 parts by weight of the epoxy resin.
Zinc sulfate is widely used as an alkali-imparting agent. When zircon sulfate is included in the buffer composition, it restores alkalinity inside the steel rod to be injected for anti-seismic reinforcement and prevents corrosion by forming an inert film on the surface.
In another specific embodiment, the cushioning material composition according to the present invention may further comprise sodium bentonite in an amount of 1 to 3 parts by weight based on 100 parts by weight of the epoxy resin in order to compact the pores, to prevent water leakage, and to improve the strength.
The sodium bentonite absorbs a large amount of water and expands to several times its original volume, and becomes a gel-like state, which closely fills the voids of the composition, thereby preventing water leakage and enhancing strength to contribute to crack prevention.
In another specific embodiment, the cushioning composition according to the present invention may further contain 1 to 5 parts by weight of zinc oxide based on 100 parts by weight of an epoxy resin for accelerating curing and corrosion prevention of the composition. When the amount is less than 1 part by weight, corrosion resistance is poor. When the amount is more than 5 parts by weight, cracks are generated due to abrupt reaction of the composition.
In another specific embodiment, the buffer material composition according to the present invention may further contain sodium bicarbonate in an amount of 1 to 5 parts by weight based on 100 parts by weight of the epoxy resin in order to suppress the rapid reaction during mixing of the buffer material composition and improve the stability of the reaction .
In another specific embodiment, the cushioning material composition according to the present invention may further comprise 1 to 5 parts by weight of polyvinylidene fluoride resin based on 100 parts by weight of the epoxy resin in order to prevent the cohesive force of the cushioning composition and the separation of the materials.
In another specific embodiment, the cushioning material composition according to the present invention may further comprise 1 to 5 parts by weight of polybutene based on 100 parts by weight of epoxy resin in order to prevent cracking of the cushioning composition and increase flexibility and adhesiveness have.
In another embodiment, the cushioning composition according to the present invention may further include a starch phosphate ester, which is a kind of anion-modified starch, to improve the water absorbency, permeability and moisture retention of the cushioning composition. 0.1 to 2 parts by weight is preferable.
In another specific embodiment, the cushioning composition according to the present invention may further comprise carboxymethyl cellulose (CMC) in order to increase the viscosity of the cushioning composition and to improve the adhesion. The amount of the carboxymethyl cellulose (CMC) 5 parts by weight are preferable.
In another specific embodiment, the cushioning composition according to the present invention may further comprise 1 to 5 parts by weight of sodium dodecyl stearate based on 100 parts by weight of the epoxy resin in order to ensure the air permeability of the cushioning composition. If the amount is less than 1 part by weight, the intended function can not be obtained. If the amount is more than 5 parts by weight, the strength of the composition is lowered.
In another specific embodiment, the cushioning composition according to the present invention may further comprise isobonyl acrylate in an amount of 1 to 5 parts by weight based on 100 parts by weight of an epoxy resin to improve dispersibility.
In another specific embodiment, the cushioning material composition is prepared by dissolving 1 to 5 parts by weight of dimethyl, based on 100 parts by weight of epoxy, in order to prevent the harmful components present on the adherend surface to which the composition is adhered from leaking out, Ammonium chloride. ≪ / RTI >
The seismic retrofitting method using the cushioning material composition according to the present invention having such a construction will be described as follows. Hereinafter, the seismic retrofit method is not limited to the embodiment of the shock absorber composition, but it is preferable to use any of the seismic reinforcement methods using a conventional shock absorber composition in the art applied to a steel bar device used for reinforcing the pressurized bressing Also,
The method for seismic retrofitting of a structure using a cushioning material composition according to the present invention, specifically a concrete structure, includes the steps of: measuring a structure to be subjected to earthquake resistance;
A step of producing a steel bar device having an anchor for reinforcing a pressurized press according to a shape of a structure actually measured after completion of the actual measurement step;
A step of piercing a hole to fix an anchor of a steel bar device to a structure to be installed;
A step of installing a steel bar to connect an anchor of the steel bar to the pierced hole;
After the step of installing the steel rods is completed, 5 to 30 parts by weight of calcium sulfoaluminate, 5 to 50 parts by weight of a filler, 10 to 40 parts by weight of fibers, 5 to 20 parts by weight of a curing agent, 0.1 to 10 parts by weight of a silane compound, 1 to 8 parts by weight of a defoaming agent, 0.1 to 10 parts by weight of a dispersant, 0.01 to 4 parts by weight of a re-fired polymer powder, and 3 to 15 parts by weight of a water- An injection step; And
And a curing step of curing after the cushioning material composition injection step is completed.
Here, the steel bar device having been subjected to the step of manufacturing the steel bar device may further include a rubber pad attaching step of attaching the rubber pad to the anchor of the steel bar device in a subsequent step.
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]
A mixture of 100 g of epoxy resin, 15 g of calcium sulfoaluminate, 25 g of aluminum hydroxide, 20 g of carbon fiber, 10 g of paratoluene sulfonic acid, 5 g of perfluoromethoxy silane, 4 g of paraffin, 5 g of castor oil, 2 g of ethylene vinyl acetate, The fugitive composition was prepared by mixing 8 g of the festival.
[Example 2]
The procedure of Example 1 was repeated, except that 70 g of urethane resin was added.
[Example 3]
The procedure of Example 1 was repeated except that 15 g of nylon 6 was added to prepare a buffer composition.
[Example 4]
(MIS) having a viscosity of about 10,000 cps and 39 wt.% Of styrene isoprene styrene (SIS) were added to the cushioning material composition in the same manner as in Example 1, except that 60 wt.% Of low viscosity methyl methacrylate resin, 39 wt.% Of high viscosity methyl methacrylate 1% by weight of methyl methacrylate was further added.
[Example 5]
The same procedure as in Example 1 was carried out except that 15 g of a deformation preventing agent containing polyethylene was further added to the buffer material composition.
[Example 6]
The same procedure as in Example 1 was carried out except that 4 g of tetraethylenepentamine was further added to the buffer material composition.
[Example 7]
The procedure of Example 1 was repeated except that 7 g of aminomethylpolydimethylsiloxane was added to the buffer material composition.
[Example 8]
The same procedure as in Example 1 was carried out except that 3 g of magnesium silicate was further added to the buffer material composition.
[Example 9]
The same procedure as in Example 1 was carried out except that 5 g of a diluent consisting of styrene monomer was further added to the buffer material composition.
[Example 10]
Was carried out in the same manner as in Example 1, except that 2 g of zinc sulfate was added to the buffer material composition.
[Example 11]
The same procedure as in Example 1 was carried out except that 2 g of sodium bentonite was further added to the buffer material composition.
[Example 12]
The same procedure as in Example 1 was carried out except that 3 g of zinc oxide was further added to the buffer material composition.
[Example 13]
The procedure of Example 1 was repeated, except that 3 g of sodium bicarbonate was further added.
[Example 14]
The procedure of Example 1 was repeated, except that 3 g of polyvinylidene fluoride resin was further added.
[Example 15]
The procedure of Example 1 was repeated, except that 3 g of polybutene was further added.
[Example 16]
The procedure of Example 1 was repeated, except that 2 g of starch phosphate ester was further added.
[Example 17]
The same procedure as in Example 1 was carried out except that 2 g of carboxymethyl cellulose was further added.
[Example 18]
The procedure of Example 1 was repeated, except that 3 g of sodium dodecyl stearate was further added.
[Example 19]
The procedure of Example 1 was repeated, except that 2 g of isobornyl acrylate was further added.
[Example 20]
The procedure of Example 1 was repeated, except that 2 g of dimethyl ammonium chloride was further added.
[Example 21]
The procedure of Example 1 was repeated, except that all of Examples 2 to 20 were added.
[Comparative Example 1]
The procedure of Example 1 was repeated except that 100 g of epoxy resin was excluded.
[Experiment]
The cushioning material compositions prepared according to Examples and Comparative Examples were placed in a mold having a diameter of 10 cm and a height of 50 cm and cured. After the mold was removed, compressive strength, flexural strength and tensile elongation were measured and shown in Table 1.
As shown in Table 1, it was confirmed that Examples 1 to 21 using the cushioning composition according to the present invention had better physical properties such as compressive strength, flexural strength and tensile elongation as compared with Comparative Examples.
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 (5)
5 to 30 parts by weight of calcium sulfoaluminate;
5 to 50 parts by weight of a filler;
10 to 40 parts by weight of fibers;
5 to 20 parts by weight of a curing agent;
0.1 to 10 parts by weight of a silane compound;
1 to 8 parts by weight of a defoaming agent;
0.1 to 10 parts by weight of a dispersant;
0.01 to 4 parts by weight of a re-forming type polymer powder; And
To the buffer material composition comprising 3 to 15 parts by weight of a water-
Further comprising 1 to 5 parts by weight of a polyvinylidene fluoride resin based on 100 parts by weight of an epoxy resin,
Further comprising starch phosphate ester in an amount of 0.1 to 2 parts by weight based on 100 parts by weight of an epoxy resin,
Further comprising 1 to 5 parts by weight, based on 100 parts by weight of epoxy resin, of sodium dodecyl stearate,
Further comprising isobonyl acrylate in an amount of 1 to 5 parts by weight based on 100 parts by weight of an epoxy resin,
And 1 to 5 parts by weight of dimethyl ammonium chloride based on 100 parts by weight of an epoxy resin.
A step of producing a steel bar device having an anchor for reinforcing a pressurized press according to a shape of a structure actually measured after completion of the actual measurement step;
A step of piercing a hole to fix an anchor of a steel bar device to a structure to be installed;
A step of installing a steel bar to connect an anchor of the steel bar to the pierced hole;
After the step of installing the steel rods is completed, 5 to 30 parts by weight of calcium sulfoaluminate, 5 to 50 parts by weight of a filler, 10 to 40 parts by weight of fibers, 5 to 20 parts by weight of a curing agent, 0.1 to 10 parts by weight of a silane compound, 1 to 8 parts by weight of a defoaming agent, 0.1 to 10 parts by weight of a dispersant, 0.01 to 4 parts by weight of a re-fired polymer powder, and 3 to 15 parts by weight of a water- An injection step; And
And a curing step of curing the cushioning material after the cushioning material composition injecting step is completed.
Further comprising a rubber pad attaching step of attaching a rubber pad to the anchor of the steel bar device manufactured in the step of manufacturing the steel bar device.
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| KR1020180008013A KR101870858B1 (en) | 2018-01-23 | 2018-01-23 | A Buffer Material Composition Comprising Epoxy Resin and Seismic Reinforcing Methods of Concrete Structure Using Thereof |
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| KR1020180008013A KR101870858B1 (en) | 2018-01-23 | 2018-01-23 | A Buffer Material Composition Comprising Epoxy Resin and Seismic Reinforcing Methods of Concrete Structure Using Thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110229531A (en) * | 2019-07-11 | 2019-09-13 | 江南大学 | A kind of complete bio-based source epoxy resin composite material and preparation method thereof |
| CN115387635A (en) * | 2022-09-29 | 2022-11-25 | 中建八局第一建设有限公司 | System for preventing concrete flat slab floor basement overload collapses |
-
2018
- 2018-01-23 KR KR1020180008013A patent/KR101870858B1/en active IP Right Grant
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110229531A (en) * | 2019-07-11 | 2019-09-13 | 江南大学 | A kind of complete bio-based source epoxy resin composite material and preparation method thereof |
| CN110229531B (en) * | 2019-07-11 | 2021-03-23 | 江南大学 | Completely bio-based epoxy resin composite material and preparation method thereof |
| CN115387635A (en) * | 2022-09-29 | 2022-11-25 | 中建八局第一建设有限公司 | System for preventing concrete flat slab floor basement overload collapses |
| CN115387635B (en) * | 2022-09-29 | 2023-07-25 | 中建八局第一建设有限公司 | System for preventing concrete girderless floor basement from overload collapse |
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