Different electrical voltage responses of cement composites under forward and backward current directions

Case Studies in Construction Materials

Seyoon Yoon¹  Dong Joo Kim²  Min Kyoung Kim² 

[1] Department of Civil Engineering, Kyonggi University, Suwon 16227, Republic of Korea;Department of Civil and Environmental Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea;

关键词: Input current direction;    Electrical voltage response;    Internal current path;    Cement-based materials;    Electrical impedance tomography;    Structural health monitoring;   

DOI  :  

来源: DOAJ

【 摘 要 】

This study investigates the effect of input current direction on the electrical voltages of ultra-high-performance concrete containing fine steel slag aggregates (UA). For the application of electrical impedance tomography based on Laplace’s equation, electrical voltage should be identical under different input current directions. However, the electrical voltages of UA differ significantly corresponding to forward and backward current directions. The percentage differences of real voltages (VRE¯) corresponding to different input current directions are between 4.57% and 76.39% under different boundary conditions such as Wenner, same-boundary, and opposite-boundary conditions. VRE¯ originates from a different internal resistance of the internal path (Rip) corresponding to the input current direction. Among the investigated boundary conditions, the Wenner boundary condition provides the lowest VRE¯ because it leads to the generation of an almost uniform current density between the two inner probes used for measuring voltages than other conditions.

【 授权许可】

Unknown