Study on the Piezoresistivity Character of Electrically Conductive Asphalt Concrete
Raw materials, such as SBS modified asphalt, graphite powder and crumb rubber were selected to blend with aggregate mixture to product electrically conductive asphalt concrete. Experimental results demonstrated the stress or strain had a great influence on the resistance of conductive asphalt concrete, which exhibited sensitive piezoresistivity. In fact, the piezoresistivity reflects the change in microstructure. The reason for piezoresistivity may involve proximity effect, microcrack and the dislocation of conductive paths due to shear strength of aggregates. With further study on the variation of the resistance, it is hopeful to explore the microstructure change of asphalt concrete under dynamic compressive stress. Therefore this new-style asphalt concrete has extensively practical foreground in fatigue damage testing, highway traffic intelligent monitoring and so on.
Zhong Cao, Lixian Sun, Xueqiang Cao, Yinghe He
X. M. Liu and S. P. Wu, "Study on the Piezoresistivity Character of Electrically Conductive Asphalt Concrete", Advanced Materials Research, Vols. 233-235, pp. 1756-1761, 2011