Multi-Channel Electrical Impedance-Based Crack Localization of Fiber-Reinforced Cementitious Composites under Bending Conditions

Applied Sciences

卷:8

Yun-Kyu An¹  Man-Sung Kang¹  DongJoo Kim²  Hanju Lee³  HongJae Yim³ 

[1] Department of Architectural Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul 05006, Korea;

[2] Department of Civil and Environmental Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul 05006, Korea;

[3] Department of Construction and Disaster Prevention Engineering, Kyungpook National University, 2559, Gyeongsang-daero, Gyeongsangbuk-do, Sangju 37224, Korea;

关键词: fiber-reinforced cementitious composite;    nondestructive testing;    electrical impedance;    crack localization;    self-sensing concrete;    structural health monitoring;   

DOI  :  10.3390/app8122582

来源: DOAJ

【 摘 要 】

This study proposes a multi-channel electrical impedance-based crack localization technique of fiber-reinforced cementitious composites (FRCCs) under bending conditions. FRCCs have a self-sensing capability by adding conductive steel fibers into nonconductive cementitious composites, making it possible to measure electrical impedance without sensor installation. Moreover, FRCCs materials can be used as a structural member thanks to its own enhanced structural ductility as well as stiffness. In a structural health monitoring point of view, these characteristics make FRCCs suitable for monitoring structural hot spots, particularly where the crack is most likely to be initiated. Since the electrical impedance obtained from FRCCs is typically sensitive to environmental and operational conditions, false alarms are often triggered. The proposed technique can minimize the false alarms by using currently measured multi-path data as well as localize a crack within the sensing range. To examine the feasibility of crack localization in FRCCs, an instantaneous multi-channel electrical impedance acquisition system and a crack localization algorithm are developed. Subsequently, three-point bending tests are carried out under various temperature conditions. The validation test results reveal that cracks are successfully identified and localized even under varying temperature conditions.

【 授权许可】

Unknown