石墨烯复合橡胶改性沥青路面性能研究

本文结合甘肃柳敦公路试验段工程实例,研究石墨烯复合橡胶改性沥青(GRA)路面性能。通过常规试验、多应力重复蠕变(MSCR)试验、动态剪切流变(DSR)试验等方法分析研究了GRA性能,并对GRA混合料的路用性能进行了研究。结果表明:GRA与苯乙烯-丁二烯-苯乙烯三嵌段共聚物(SBS)改性沥青相比,针入度降低了12.7%,软化点、高温稳定性及其高温抗变形能力相当,抗应力变形能力及应力敏感性有所提升;GRA与橡胶SBS改性沥青相比,软化点增加了14.1%,弹性恢复增加了6.5%,针入度相当,高温稳定性及其高温抗变形能力有所提升。GRA较SBS改性沥青混合料表现出良好的路用性能,现场混合料更易于压实,渗水较小、强度较高,但构造深度有所降低。

Research on Performance of Graphene Composite Rubber Modified Asphalt Pavement

In this paper, the performance of graphene composite rubber modified asphalt (GRA) pavement was studied based on the engineering example of the Liu-Dun highway test section in Gansu province. The performance of GRA was analyzed by routine tests, multiple stress creep and recovery (MSCR) test, dynamic shear rheometer (DSR) test and other methods, and the road performance of GRA mixtures was also studied. The results show that compared with SBS modified asphalt, the penetration of GRA is reduced by 12.7%, the softening point, high temperature stability and high temperature resistance to deformation are equivalent, and the resistance to stress deformation and stress sensitivity are improved.Compared with rubber SBS modified asphalt, GRA has an increase in softening point of 14.1%, elastic recovery by 6.5%, equivalent penetration, high temperature stability and high temperature resistance to deformation. Compared with SBS modified asphalt mixture, GRA has better road performance. The on-site mixture is easier to compact, and has less water seepage and higher strength, but the structure depth is reduced.