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1. Piezoresistivity of carbon fiber reinforced cement-matrix composites | |||
Zhao Xiaohua,Li Guobao,Wang Yulin,Li Gengying | |||
Civil and Architectural Engineering 09 February 2010 | |||
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Abstract:Both positive and negative piezoresistivity occur in cement-matrix composites containing short carbon fibers due to the variation of moisture content in the composites. For most cases the electrical resistivity of the composites decreases monotonically upon longitudinal compression, and piezoresistivity tends to be positive. However, its magnitude varies. Lower moisture content leads to stronger piezoresistivity. When moisture content is in a specific range, the electrical resistivity of the composites increases monotonically upon compressive strain, and piezoresistivity tends to be negative. This effect is much stronger than positive piezoresistivity. The transition from positive to negative piezoresistivity is observed. It is proposed that the occurrence of these phenomena is attributable to decreases in both pore network connectivity and capillary porosity during compression. | |||
TO cite this article:Zhao Xiaohua,Li Guobao,Wang Yulin, et al. Piezoresistivity of carbon fiber reinforced cement-matrix composites[OL].[ 9 February 2010] http://en.paper.edu.cn/en_releasepaper/content/40099 |
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