导电沥青混凝土及其功能特性研究进展

为系统掌握国内外有关导电沥青混凝土的研究现状,通过调查现有导电沥青混凝土的添加材料、路用性能、功能特性、影响因素等,对比不同导电材料制备沥青混凝土的电导率特征,总结导电沥青混凝土的功能特性及其电导率影响因素。结果表明:国内外主要采用石墨、碳纤维、钢棉作为导电材料制备导电沥青混凝土,石墨对沥青混凝土的电导率提升效果最佳,碳纤维可提高沥青混凝土的路用性能;同时,导电沥青混凝土具有明显的压敏特性,感应加热可增强沥青混合料的抗疲劳性能,通电加热可快速提高沥青混凝土的温度,导电沥青混凝土的电导率主要受空隙率、环境温度、电极类型的影响。

Review on Functional Features of Conductive Asphalt Concrete

Conductive asphalt concrete, which concerns the piezoresistive effect and induction heating, is a new function material. The main objective of the paper is to master the research status about conductive asphalt concrete. Adding material, road performance and influencing factors of conductive asphalt concrete are investigated to estimate the functional features of conductive asphalt concrete. It was found that conductive asphalt concretes were constructed by modifying with electrically conductive materials, such as graphite, carbon fiber, steel wool. The graphite modified asphalt concretes would have the best ability of conductivity, carbon fiber could improve the road performance of asphalt concrete. Dispersing electrically conductive materials in asphalt concrete made it a smart material as it developed a piezoresistive effect, and which would have the ability to enhance anti-fatigue performance of the asphalt mixture by induction heating. Electrical heating could raise the temperature of asphalt concrete, void fraction, environment temperature and the types of electrode were principal factors for the conductivity of conductive asphalt concrete.