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Title |
Evaluation of Residual Bond Stress between Carbon-fiber Reinforced Polymer and Steel Rebar Using Ultra-High-Performance-Concrete after Elevated Temperature
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Authors |
유선재(Sun-Jae Yoo) ; 이호진(Ho-Jin Lee) ; 원천봉(Tian-Feng Yuan) ; 윤영수(Young-Soo Yoon) |
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DOI |
https://doi.org/10.11112/jksmi.2021.25.6.169 |
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Abstract |
In this study, pull-out tests were conducted at room temperature, 150 °C and 250 °C to evaluate the residual bond strength of carbon fiber reinforcement polymer, CFRP after elevated temperature and deformed steel rebar of D10 and D13 were also evaluated after the high temperature heating for comparison. As a result of the experiment, the bond strength of the CFRP after 150 °C and 250 °C decreased by 9.94 % and 41 %, respectively. On the other hand, after thermal heating, both the steel rebar of D10 and D13 had a lower rate of reduction in bond strength than that of the CFRP. Also slip at the maximum bond strength also decreased after the heating for both the CFRP and the rebars. Through it, the correlation between the bond strength and the slip reduction due to thermal heating was confirmed and bond slip models were presented. Finally the experimental result was evaluated as relative bond strength to identify the residual bond performance of the CFRP and the rebar after the heating was confirmed by comparing with the existing test result of the bond strength after elevated temperature.
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