FRCCs의 자가센싱 임피던스 응답에 미치는 균열 발생 및 온도 변화 영향성
Crack Initiation and Temperature Variation Effects on Self-sensing Impedance Responses of FRCCs
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초록
Fiber-Reinforced Cementitious Composites (FRCCs)는 시멘트 복합체에 혼입한 전도성 섬유로 인해 전기 전도성을 가진다. 이러한특성은 전기적 응답 계측을 통하여 별도의 센서 설치가 필요 없는 구조물의 균열 모니터링을 가능하게 한다. 하지만 전기적 응답은 균열 발생뿐만 아니라 온도의 변화에도 민감하게 변화하기 때문에 온도 요인은 전기적 응답 계측을 통한 균열 탐지를 방해하는 요소로 작용할 수 있다. 더욱이 전기적 응답을 측정하기 위한 탐침의 개수가 증가 할수록 원하지 않은 접촉 노이즈가 발생하기 때문에 이 논문에서는 탐침의 개수를 줄이기 위해 자체적인 자가센싱 임피던스 회로를 설계하였다. FRCC의 균열 발생과 온도 변화가 임피던스에 미치는 영향성은 자가센싱 임피던스회로를 이용해 실험적으로 측정되었으며, 실험 결과, 임피던스 응답은 균열 발생보다 온도 변화에 더 민감하게 변화됨을 알 수 있었다.
Abstract
Fiber-Reinforced Cementitious Composites (FRCCs) have electrical conductivity by inserting reinforced conductive fibers into a cementitiousmatrix. 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 disturbcrack detection on the measured electrical responses. Moreover, as sensing probes for measuring electrical reponses increase, undesired contact noisesare often augmented. In this paper, a self-sensing impedance circuit is specially designed for reducing the number of sensing probes. The, crack initiationand temperature variation effects on the self-sensing impedance responses of FRCCs are experimentally investigated using the self-sensing impedancecircuit. The experiment results reveal that the electrical impedance response are more sensitively changed due to temperature variation than crackinitiation.
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