废胎胶粉改性沥青影响因素探讨

采用斜交胎和子午胎两种废胎胶粉对基质沥青(中海70号沥青和SK70号沥青)进行改性,试验研究结果表明:胶粉掺量为20%,搅拌温度为180℃,废胎胶粉为斜交胎时,改性沥青的高温稳定性、低温抗裂性、弹性恢复性能较基质沥青有明显提高;胶粉粒径可根据技术经济性选择合适的粒径等级;斜交胎胶粉的改性沥青性能明显好于子午胎胶粉;从高温性能、感温性能及弹性性能指标来看,中海70号改性效果比SK70号沥青差,但其低温指标略好。

Effects of Scrap Tires Type on Performance of Crumb Rubber Modified Asphalt Binder

In this paper, two kinds of crumb rubber are made from oblique and meridian scrap fires, then are individually used for modification of Zhonghai 70# and SK 70# base asphalt, the test results show that： properties such as temperature stability.low temperature crack resistance and elastic recovery are markedly improved by admixing of 20% crumb rubber from oblique tire at 180℃ ; particle sizes of crumb rubber can be accommodated to prefer level according to circumstances of the project or technical and economical permition ; performances of modified asphalt binder with oblique tire crumb rubber are significantly better than meridian tire crumb rubber; high -temperature,thermal and elastic properties of modified asphalt blend from SK 70# base asphalt are better than from Zhonghai 70# base asphalt; but low - temperature properties of modified asphah from Zhonghai 70# base asphalt are slightly better than from SK 70# asphalt.