废旧轮胎橡胶粉改性沥青影响因素研究

Study on Influences Factors of Crumb Rubber Modified Asphalt

为客观揭示废旧轮胎橡胶粉对基质沥青的改性作用,采用Superpave沥青结合料测试方法,探讨了不同橡胶粉类型、目数、掺量、搅拌温度以及基质沥青类型等因素对胶粉改性沥青路用性能的影响规律。试验结果表明:货车轮胎胶粉改性沥青的常温和高温性能要优于小车轮胎胶粉橡胶沥青,宜选20目货车轮胎胶粉进行基质沥青改性;随胶粉掺量增加,橡胶沥青的弹性恢复和粘度明显提高,考虑施工粘度要求,橡胶粉的掺量最大不能超过20%;过高的拌和温度对于橡胶沥青的高温性能和抗疲劳性能不利,推荐的拌和温度以180℃为宜;基质沥青标号对橡胶沥青的性能有显著影响,在橡胶沥青工程应用中,应根据不同的区域环境特点,有针对性地选择基质沥青。

In order to study modified mechanism of crumb rubber modified asphalt, based on Superpave testing methods, this paper analyzed the effect of crumb rubber type, fineness, content, mixing temperature and matrix asphalt on the performance of crumb rubber modified asphalt. The major findings are presented below. The normal and high temperature performance of Truck rubber powder modified asphalt is superior to the car rubber powder asphalt. The optimal 20 mesh truck rubber powder is recommended to modify base bitumen. With increasing rubber powder content, viscosity and elasticity of the rubber asphalt is enhanced distinctly. Considering the construction feasibility, rubber powder content less than 20% is advisable. High operation temperature will reduce high temperature and anti-fatigue performance of rubber modified asphalt. The base bitumen has significant effect on the performance of rubber modified asphalt. The research results will provide the technical basis and guarantee for the application of rubber modified asphalt.