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Journal of the Korea Concrete Institute

J Korea Inst. Struct. Maint. Insp.
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  • Korea Citation Index (KCI)

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Title Prediction of Long-term Residual Inter-laminar Shear Strength of Thermally Damaged GFRP Rebar
Authors 김민철 ; 문도영 ; 김성도
DOI jksmi.2014.18.3.108
Page pp.108-115
ISSN 2234-6937
Keywords GFRP 보강근 ; 열손상 ; 알칼리 영향 ; 계면전단강도 ; 폭로실험 GFRP reinforcement ; Thermal damage ; Effect of alkalinity ; Inter-laminar shear strength ; Accelerated test
Abstract Mechanical properties of GFRP rebars significantly decrease due to high temperature as well as alkalinity of concrete. This study focuses on the long-term reduction of inter-laminar shear strength of pre-damaged GFRP rebars by high temperature. For this investigation, bare GFRP rebar specimens were exposed to 270℃ for 1hour and then immerged in alkali solution for several months and tested in shear. No thermally conditioned specimens were immerged and tested for the comparisons. In results, the reduction of thermally damaged GFRP rebars was greater than that of no thermally damaged ones. Based on the accelerated experimental test data, an polynomial equation is presented for prediction of long-term residual inter-laminar shear strength of GFRP rebars previously damaged by high temperature.