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Title |
Quantitative Image Analysis of Concrete-Epoxy Interface Failure Mode Subjected to Sustained Load and Temperature
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Authors |
정유석(Yoseok Jeong) ; 김우석(WooSeok Kim) |
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DOI |
https://doi.org/10.4334/JKCI.2022.34.1.013 |
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Keywords |
콘크리트-에폭시 계면; 크리프; 온도; 파괴모드; 이미지분석 concrete-epoxy interface; creep; temperature; failure mode; image analysis |
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Abstract |
In this study, we aimed to develop an image analysis method for evaluating the fracture surfaces of concrete-epoxy interfaces (CEI). CEI is formed when an externally-bonded fiber-reinforced polymer (FRP) system, which is considerably influenced by environmental and loading conditions in service, is applied. CEI debonding failure is characterized into one of three possible modes: cohesive failure in the concrete (CC), interfacial failure (IF), and cohesive failure in the epoxy (CE), using the developed image analysis method. Quantitative image analysis with a set of rules for failure mode classification enabled the correlation of the CEI failure mode with bond performance, such as the fracture energy three-point bending specimens and single-lap shear specimens’ peak pull-off force. The results reveal a robust failure mode and bond performance correlation. Extended periods of sustained loading decrease the bond performance and shift the dominant failure mode from CC to IF.
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