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Title |
Experimental Study on Bond Strength between Carbon Fiber Sheet and Concrete
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Authors |
유영찬 ; 최기선 ; 최근도 ; 이한승 ; 김긍환 |
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Keywords |
effective bond length 부착파괴; 인발접착실험; 인장전단부착실험; 평균부착응력도; 유효부착길이; bond failure; pull-out test; tensile-shear test; average bond stress |
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Abstract |
Carbon fiber sheet(CFS) has been widely used for strengthening of the concrete building structures due to its excellent physical properties such as high strength, light weight and high durability. Bond strength or behavior, on the other hands, between carbon fiber sheet and concrete is very important in strengthening the concrete member using CFS. Therefore the bond failure mechanism between CFS and concrete should be fully verified and understood. This study is to investigate the bond strength of CFS to the concrete by the direct pull-out test and the tensile-shear test. In the direct pull-out tests, the bond strength under the various environmental conditions such as curing temperature, surface condition on concrete and water content of concrete are evaluated. Also, the effective bond length, lu and the average bond stress, τy are examined in the tensile-shear tests. Based on the test results, it is concluded that the curing temperature is the most critical element for the bond strength between CFS and concrete. And, the proper value of lu and τy is recommended with 15 cm and 9.78∼ 11.88 kgf/㎠ respectively.
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