碳纤维增强水泥复合材料的电导性能及其应用

研究了碳纤维增强水泥复合材料的电导性能, 用扫描电子显微镜(SEM ) 观察了材料产生电导渗流时的显微结构, 讨论了纤维掺量和纤维长度对电导性能的影响以及受载过程中材料电导率的变化规律。结果表明, 适当控制碳纤维的尺寸、含量, 可以明显提高材料的电导性能; 材料结构中存在电导渗流现象, 渗流阈值随受载过程而变化; 碳纤维增强水泥复合材料能够作为本征机敏材料, 反应试件受载时的应力应变关系。

ELECTRICAL CONDUCTIVITY IN CARBON FIBER REINFORCED CEMENT COMPOSITE: PERFORMANCE AND APPLICATION

Electrical conductivity of carbon fiber reinforced cement composite was measured. The conductivity of the specimens increased by several orders of magnitude while the volume fraction of fibers reached a higher value than the critic concentration. The microstructure associated with electrical percolation phenomena was observed. The influence of fiber volume fraction and fiber length on electrical conductivity and the changing of electrical conductivity under different loading levels were also discussed. The percolation threshold decreases under loading. The relative changing of electrical conductivity both under single loading and under cyclic loading may sensor the stress in elastic, nonelastic, and fracture regions with sensitive response. The results provide an important guide for the manufacture of conductive and intrinsically smart carbon fiber reinforced composites.