基于SHRP试验的高掺量橡胶沥青再生混合料路用性能研究

Research on Road Performance of High Content Rubber Asphalt Recycled Mixture Based on SHRP Test

对于改性沥青,常用评价高温性能指标对改性沥青敏感性差。文中通过SHRP中动态剪切试验和重复蠕变试验评价沥青高温性能。并通过试验段车辙试验分析再生混合料高温性能。研究表明:老化前后两种沥青的高温性能规律一致,即高掺量橡胶沥青最好,SBS改性沥青次之。在同样的加载条件下,高掺量橡胶沥青总变形小,变形恢复能力好,残余变形小,具有优异的高温性能。

For modified asphalt,the commonly used evaluation high temperature performance indicators are poorly sensitive to modified asphalt.In this paper,dynamic shear test and repeated creep test in SHRP are used to evaluate asphalt high temperature performance.And through the rutting test in the test section,the high temperature performance of the recycled mixture was analyzed.Research shows that the high temperature performance of the two asphalts before and after aging is consistent,that is,high content rubber asphalt is the best,and SBS modified asphalt is the second.Under the same loading conditions,high content rubber asphalt has small total deformation,good deformation recovery ability,small residual deformation.And excellent high temperature performance.