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Title |
Bonding Behavior of Ribbed CFRP Rebar Embedded in UHPC considering Concrete Cover Thickness
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Authors |
유선재(Sun-Jae Yoo) ; 원천봉(Tian-Feng Yuan) ; 장룩파르(Jean-Luc Malan Parr) ; 윤영수(Young-Soo Yoon) |
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DOI |
https://doi.org/10.4334/JKCI.2023.35.2.177 |
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Keywords |
탄소 보강근; 초고강도 콘크리트; 피복두께; 매입 길이; 부착 강도 carbon fiber reinforced polymer; ultra high strength concrete; cover thickness; embedment length; bond strength |
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Abstract |
In this study, pull-out tests were conducted on ribbed carbon fiber reinforced polymer (CFRP) bars to evaluate bond strength, taking into account the variables of concrete compressive strength, cover thickness, and embedment length. The failure mode of ribbed CFRP bars with a diameter of 13 mm was also evaluated. Results showed that it was possible to prevent splitting failure of normal- and high-strength concrete when a cover thickness of 2.5 db and 3.5 db was used, respectively. Furthermore, only micro-cracks were observed in ultra-high performance concrete. Contrary to previous research, the bond strength continued to increase as the compressive strength of concrete and embedment length of ribbed CFRP bars increased. This enabled correlation between concrete compressive strength, cover thickness, and bond stress as well as analysis of the failure modes of concrete and ribbed CFRP bars. The experimental results were then compared with bond design codes to confirm the bond characteristics of ribbed CFRP bars.
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