Preparation and electrical properties of conductive asphalt concretes containing graphene and carbon fibers

Graphene is a promising material applied in the field of road. In this study, graphene and carbon fiber were added in the asphalt concretes to achieve the aim of the effect of electrical conductivity and thermal conductivity. Graphene played a complementary role in the overall conduction pathway. The distribution of graphene in asphalt could be observed by fluorescence microscope. Meanwhile, preparing the conductive asphalt mastic and mixing method of the conductive asphalt concrete were also investigated. DSR test was used to test the effect of graphene on the shear deformation resistance and creep performance of bitumen. CT images were introduced into finite element program for analyzing current density distribution of conductive asphalt concrete to obtain the appropriate gradation. The optimum content of conductive medium was determined by measuring resistivity of concrete and heat conduction coefficient. Pressure sensitive characteristics were also researched to evaluate the effect of stress on electrical conductivity. Based on the results, it was found that addition of graphene reduces the resistivity of concrete and improves the thermal conductivity.