碳纤维水泥基复合材料电阻特性的研究

Electrical Resistance of Carbon Fiber Reinforced Cement Composite

研究了碳纤维水泥基复合材料的电阻特性,结果表明,碳纤维水泥基复合材料电阻率随着碳纤维体积分数的提高而下降;碳纤维掺入量存在一个饱和点,超过此饱和点,碳纤维水泥基复合材料的电阻率变化趋于稳定;碳纤维水泥基复合材料电阻率随加载频率的增大而降低.碳纤维水泥基复合材料的电学特性可以用电渗透原理解释,并由扫描电镜试验结果得到验证.

Experiment results of electrical resistance of carbon fiber reinforced cement composite are presented. The electrical resistivity of specimens decreases with increasing volume fraction of carbon fiber. Moreover, it is found that there is a saturation point for carbon fiber volume fraction. Beyond that, the change of electrical resistivity with the variation of carbon fiber volume fraction becomes leveling off. It is well known that the electrical resistivity of carbon fiber reinforced cement composite is a function of frequency of applied voltage, the higher the frequency, the lower the electrical resistivity of the material. A simple structural model based on the principle of electrical percolation is developed to interpret the electrical resistance of carbon fiber reinforced cement composite. The SEM observation associated with the electrical properties of composite has been obtained and that is to support the model.