Xu-Dong Zha;Yong-Qiang Chen;Jing Chen
. 2012, 43(07): 872-876.
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In order to determine a reasonable carbon fiber contents for the conductive asphalt mixture with carbon fiber, the chopped polyacrylonitrile (PAN) based carbon fiber was selected as a conductive phase material. Many laboratory experiments were conducted to analyze the effect of the carbon fiber contents on the Marshall performances and the conductive performances for the AC-13C of conductive asphalt mixture and then verify its pavement performances. The results show that, under the same asphalt-aggregate ratio, with the increases of the carbon fiber contents, the bulk volume density, the voids filled with asphalt and the Marshall stability of the conductive asphalt mixture are appeared the trend from increasing to decreasing, the volume of air voids and the voids in mineral aggregate are changed as the relation from decreasing to increasing, but the flow value is increased continuously. The technical standards of AC, adjustment and SMA were applied to the asphalt mixtures with the different ranges of carbon fiber content, respectively, and the reasonable optimal asphalt-aggregate ratios were determined. There is a good semilogarithm correlation between the optimal asphalt-aggregate ratios and the carbon fiber contents. Under the optimal asphalt-aggregate ratio, a good correlation of power function is showed between the logarithms of electrical resistivity and the carbon fiber contents for the conductive asphalt mixture. All the pavement performances of asphalt mixture with 0.1% of carbon fiber content have attained the technical requirements of modified asphalt mixture and SMA in the climate conditions with high demand. Therefore, the suitable carbon fiber content can play an excellent role in reinforcing the conductive asphalt mixture and then form the stable conductive network. The technical requirements of various performances and conductive heating are integrated to recommend the suitable carbon fiber content as 0.1%.