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31 March 1998 Electrical tagging of cement composites for nondestructive integrity monitoring
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The results of an investigation on the bulk electrical properties of carbon fiber cement composites (CFCC) with the prospect of developing a new nondestructive testing method are presented. The addition of carbon fibers to portland cement- based concrete or mortar improves the structural performance and at the same time significantly decreases the bulk electrical resistivity. This makes CFCC responsive to interrogation by electrical methods. This paper presents experimental data on the electrical behavior of CFCC as a multi-phase medium consisting of conducting and insulating phases. The volume electrical resistivity of CFCC samples was recorded as a function of curing time. The dependence of this electrical resistivity on the water-cement ratio, sand-cement ratio and volume fraction of carbon fibers in the mix was determined. Three different electrode configurations were investigated for their applicability in measuring electrical resistivity of CFCC samples.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Farhad Reza, Gordon B. Batson, Jerry A. Yamamuro, and Jong S. Lee "Electrical tagging of cement composites for nondestructive integrity monitoring", Proc. SPIE 3396, Nondestructive Evaluation of Materials and Composites II, (31 March 1998);

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