Investigation of the conductivity of asphalt concrete containing conductive fillers
Investigation of the conductivity of asphalt concrete containing conductive fillers
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DOI：
10.1016/j.carbon.2004.12.033
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发表时间：
2005-06
期刊：
影响因子：
10.9
通讯作者：
Shaopeng Wu;L. Mo;Shui Zhonghe;Zheng Chen
中科院分区：
文献类型：
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作者：
Shaopeng Wu;L. Mo;Shui Zhonghe;Zheng Chen
采用炭黑、石墨和碳纤维设计制备了单一填料和导电粉与碳纤维混合填料的导电沥青混合料。研究了填料种类、填料掺量及混合填料对沥青混凝土电阻率的影响。实验结果表明，在单填料复合材料中，电阻率随填料含量的变化出现绝缘-导电的逾渗转变，其逾渗阈值分别为炭黑、石墨和碳纤维的12%、10%和5%（体积百分比）。混合填料的复合作用比单一的粉末填料有明显的优势，但在相同的填料总含量下，复合填料的导电性能比单一的纤维没有明显的优势。但是，将少量昂贵的纤维添加到较大量的较便宜的CB或石墨中可以是具有成本效益的系统。扫描电子显微镜图像提供洞察混合填料的导电性增强的机制。导电填料颗粒在沥青混凝土中表现出短程接触或连接，而碳纤维由于高纵横比而表现出长程导电桥接效应和短路效应。
Carbon black, graphite and carbon fibre were employed to design and prepare electrically conductive asphalt mixtures containing single filler or mixed fillers of conductive powder plus carbon fibre. The effects of filler type, filler content and mixed fillers on the resistivity of asphalt concrete were investigated. Experimental results showed that the insulating-conductive percolation transition of the resistivity under the function of filler content appears in the single-filler composites and the percolation threshold is approximately 12%, 10%, and 5% by volume percentage of the binder phase for carbon black, graphite and carbon fibre respectively. The combination function of mixed fillers has appreciable advantages over single powder filler, but no obvious advantages over simple fiber in the conductivity improvement at the same total filler content. But the addition of small amounts of expensive fibers to larger amounts of cheaper CB or graphite can be a cost effective system. Scanning electron microscope images provide insight into the mechanisms of conductivity enhancement for mixed fillers. Conductive filler particles exhibit the short-range contacts or connections in asphalt concrete, whereas carbon fibres exhibit a long-range conductive bridging effect and short-circuit effect because of the high aspect ratio.