碳纤维/石墨烯导电沥青混凝土的非线性伏安特性

基于实验室制备的碳纤维/石墨烯导电沥青胶浆及沥青混凝土,研究了碳纤维/石墨烯导电沥青混凝土的导电特性与导电行为,以及电阻与外加电压间的相关性.结果表明:所制备的沥青胶浆及沥青混凝土均表现出了明显的非线性导电行为,其电阻率随着电压的增大显著降低,并且非线性程度随着导电填料掺量的增大逐渐减弱.运用动态随机电阻器网络模型证明了隧道效应是造成这一非线性导电行为的主要原因,在足够强的电压作用下,原本处于绝缘状态下的部分载流子有序排列,出现了额外的导电通路.

Nonlinear Voltammetric Characteristics of Carbon Fiber/Graphene Conductive Asphalt Concrete

Carbon fiber/graphene conductive asphalt mortar and asphalt concrete was prepared in the laboratory, the conductivity and conduction behavior of carbon fiber/graphene conductive asphalt mortar and asphalt concrete and the correlation between its resistance and applied voltage were studied. Through the research of the voltammetric characteristic curve, it is shown that the asphalt mortar and concrete has obvious nonlinear conduction behavior. The resistivity decreases significantly with the increase of voltage. The degree of nonlinearity gradually decreases with the increase of the amount of conductive filler. Using the dynamic random resistor network model, it is proved that the tunneling effect is the main cause of this nonlinear behavior. Under strong enough voltage, the partial carrier in the insulating region will be arranged to form the additional conductive path.