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Title |
Crack Initiation and Temperature Variation Effects on Self-sensing Impedance Responses of FRCCs
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Authors |
강명수(Myung-Soo Kang) ; 강만성(Man-Sung Kang) ; 이한주(Han Ju Lee) ; 임홍재(Hong Jae Yim) ; 안윤규(Yun-Kyu An) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.3.069 |
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Keywords |
섬유보강 콘크리트 ; 임피던스 ; 구조물 건전성 모니터링 ; 온도 영향성 ; 손상진단 Fiber-reinforced cementitious composites ; Electrical impedance ; Temperature variation ; Crack detection ; Structure health monitoring |
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Abstract |
Fiber-Reinforced Cementitious Composites (FRCCs) have electrical conductivity by inserting reinforced conductive fibers into a cementitious matrix. Such characteristic allows us to utilize FRCCs for crack monitoring of a structure by measuring electrical responses without sensor installation. However, the electrical responses are often sensitively altered by temperature variation as well as crack initiation. The temperature variation may disturb crack detection on the measured electrical responses. Moreover, as sensing probes for measuring electrical reponses increase, undesired contact noises are often augmented. In this paper, a self-sensing impedance circuit is specially designed for reducing the number of sensing probes. The crack initiation and temperature variation effects on the self-sensing impedance responses of FRCCs are experimentally investigated using the self-sensing impedance circuit. The experiment results reveal that the electrical impedance response are more sensitively changed due to temperature variation than crack initiation.
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