不同沥青材料微观结构与自愈合特性研究

（1.广西道路结构与材料重点实验室，广西 南宁  530007；2.高等级公路建设与养护技术、材料及装备交通运输行业研发中心，广西 南宁  530007；
3.广西交通科学研究院有限公司，广西 南宁  530007）

摘要：对A-70#道路石油沥青、SBS改性沥青、橡胶改性沥青3种不同类型的沥青材料，采用荧光显微镜进行微观结构分析，采用DSR动态剪切流变仪进行自愈合性能测试及评价。试验结果表明：温度越高，SBS改性剂、橡胶粉与基质沥青越趋于相溶状态，SBS与70#基质沥青的相溶性优于橡胶粉；SBS改性沥青与橡胶改性沥青的自愈合性能相当，且优于A-70#道路石油沥青；沥青材料的自愈合性能与损伤度成反比，损伤度越大，自愈合能力越不显著；橡胶改性沥青的自愈合能垒最大，SBS改性沥青次之，A-70#道路石油沥青的最小，橡胶沥青发生自愈合效应需更高的温度条件与热量补给。

关键词：自愈合；微观结构；沥青材料；道路工程

中图分类号：TU535        文献标识码：A        文章编号：1001-702X（2019）08-0030-04

 

Research on microstructure and self-healing characteristic of different asphalt materials

XUAN Weian1，2，3，XIONG Jianping1，2，3，WANG Bin1，2，3，ZHOU Shengbo1，2，3

（1.Guangxi Key Lab of Road Structure and Materials，Nanning 530007，China；2.Research and Development Center on Technologies，Materials and Equipment of High Grade Highway Construction and Maintenance Ministry of Transport，Nanning 530007，China；

3.Guangxi Transportation Research & Consulting Co. Ltd.，Nanning 530007，China）

Abstract：In this paper，fluorescence microscope was used to analyze microstructure of A-70# asphalt，SBS modified asphalt and rubber modified asphalt，and DSR was used to test and evaluate self-healing properties. The results show that the higher the temperature is，the more the SBS modifier，rubber powder and matrix asphalt tend to be phase soluble，and the solubility of SBS and 70# asphalt is better than that of rubber powder. The self-healing capacity of SBS modified asphalt and rubber modified asphalt is comparable and better than that of A-70# road petroleum asphalt. The self-healing property of asphalt material is inversely proportional to the degree of injury. The greater the degree of injury, the less significant the self-healing ability. The self-healing energy barrier of rubber modified asphalt is the largest，followed by SBS modified asphalt，and 70# asphalt is the smallest. The self-healing effect of rubber asphalt requires higher temperature conditions and heat supply.

Key words：self-healing，microstructure，asphalt materials，road engineering