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http://dx.doi.org/10.12652/Ksce.2019.39.6.0675

Effects of Matrix Strength, Fiber Type, and Fiber Content on the Electrical Resistivity of Steel-Fiber-Reinforced Cement Composites During Fiber Pullout  

Le, Huy Viet (Sejong University)
Kim, Dong Joo (Sejong University)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.39, no.6, 2019 , pp. 675-689 More about this Journal
Abstract
Development of smart construction materials with both self-strain and self-damage sensing capacities is still difficult because of little information about the self-damage sensing source. Herein, we investigate the effects of the matrix strength, fiber geometry, and fiber content on the electrical resistivity of steel-fiber-reinforced cement composites by multi-fiber pullout testing combined with electrical resistivity measurements. The results reveal that the electrical resistivity of steel-fiber-reinforced cement composites clearly decreased during fiber-matrix debonding. A higher fiber-matrix interfacial bonding generally leads to a higher reduction in the electrical resistivity of the composite during fiber debonding due to the change in high electrical resistivity phase at the fiber-matrix interface. Higher matrix strengths, brass-coated steel fibers, and deformed steel fibers generally produced higher interfacial bond strengths and, consequently, a greater reduction in electrical resistivity during fiber debonding.
Keywords
Self sensing; Fiber matrix interface; Electrical resistivity; Multiple fiber pullout; Steel fiber reinforced cement composite;
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