| Title |
Effects of Matrix Strength, Fiber Type, and Fiber Content on the Electrical Resistivity of Steel-Fiber-Reinforced Cement Composites During Fiber Pullout |
| Authors |
(Le, Huy Viet) ; 김동주(Kim, Dong Joo) |
| DOI |
https://doi.org/10.12652/Ksce.2019.39.6.0675 |
| Keywords |
자가감지;섬유와 매트릭스 사이 계면;전기저항률;다수의 섬유인발;강섬유보강 시멘트 복합재료 Self sensing;Fiber matrix interface;Electrical resistivity;Multiple fiber pullout;Steel fiber reinforced cement composite |
| 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. |