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Title |
Evaluation on Strengthening Capacities and Rebound Rate of Structures with Sprayed FRP
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Keywords |
구속효과 ; 휨보강 ; 유리 섬유 ; 분사식 FRP ; 폴리에스테르 ; 반발률 ; Confining effect ; Flexural strengthening ; Glass fiber ; Sprayed FRP ; Polyester ; Rebound rate |
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Abstract |
This paper investigates experimentally the confining effect, strengthening capacity and rebound rate of sprayed Fiber-Reinforced-Polymer (SFRP). From the method, resin and chopped fibers are sprayed separately from the nozzle with high pressure, and then they are attached to the concrete surface, so structure could be repaired. To evaluate the strengthening effect of sprayed FRP, cylindrical specimens and beam specimens were strengthening with SFRP. As main material of FRP, glass fiber and polyester resin are used. To investigate the optimum condition of sprayed FRP, the effects of fiber length, coating thickness, fiber volume ratio and concrete strength were examined. Capacities of sprayed FRP method were also compared to the FRP sheet method. In case of the sprayed FRP, rebound rate is important parameter considering economical efficiency and constructibility, so rebound rate of was discussed. From the test results, optimum conditions of sprayed FRP were determined. SFRP method showed superior strengthening capacities than FRP sheet method.
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