Numerical and Experimental Investigation of Piezoresistance of Asphalt Concrete Containing Graphite

Abstract:

Asphalt concrete is an insulating material. Conductive materials are added to asphalt concrete in order that improving the conductivity. Conductive asphalt concrete (CAC) has become a promising method to snow melting and self-monitoring. In this study, the piezoresistance of CAC which can be improved the conductivity through graphite are analyzed. Based on the interparticle separation and bitumen film-thickness of graphite particle, a model has been developed to predict the piezoresistance under the applied stress. The influences of applied stress, graphite diameter, graphite volume fraction, compressive modulus on the piezoresistance are interpreted through laboratory experiments. Both the numerical and experimental results show that the theoretical data obtained from the model are found to agree with the experimental ones fairly well. In addition, it was found that all these parameters influence the piezoresistance by altering the change process of interparticle separation of graphite.

• Periodical: Materials Science Forum (Volume 852)
• Pages: 1383-1390
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.852.1383
• Online since: April 2016
• Authors: Ning Tang, Wen Hao Pan, Yan Wen Chen, Min Dai, Qing Wang
• Keywords: Conductive Asphalt Concrete, Graphite, Percolation Threshold, Piezoresistance

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