碳纤维水泥基复合材料电阻特性的研究

研究了碳纖維水泥基復合材料的電阻特性,結果表明,碳纖維水泥基復合材料電阻率隨著碳纖維體積分數的提高而下降;碳纖維摻入量存在一個飽和點,超過此飽和點,碳纖維水泥基復合材料的電阻率變化趨于穩定;碳纖維水泥基復合材料電阻率隨加載頻率的增大而降低.碳纖維水泥基復合材料的電學特性可以用電滲透原理解釋,并由掃描電鏡試驗結果得到驗證. 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.