基于MSCR试验的石墨烯复合橡胶改性沥青抗老化性能研究

为了评价石墨烯复合橡胶改性沥青(GRS)的高温抗变形能力随老化时间的变化规律,分别选取SBS改性沥青、橡胶复合改性沥青及石墨烯复合橡胶改性沥青,进行原样及热氧老化20h(TFOT5h+PAV20h)、40h(TFOT5h+PAV40h)和60h(TFOT5h+PAV60h)的多应力重复蠕变试验(MSCR)。结果表明,在同一温度对应相同蠕变加载应力状态下,GRS改性沥青的Jnr最小,SBS改性沥青的Jnr最大。GRS改性沥青有更好的高温抗变形能力,PAV老化60h后,GRS改性沥青的R3.2kPa最大,Jnr-3.2kPa最小,对热氧老化作用敏感度最低。

Study on anti-aging performance of graphite rubber modified asphalt based on MSCR test

In this paper, in order to evaluate the variation of high temperature deformation resistance of graphene-rubber modified asphalt(GRS) with aging time, SBS modified asphalt, rubber modified asphalt and GRS modified asphalt are selected for multi-stress repeated creep tests(MSCR) of origin, 20 h(TFOT5 h + PAV20 h), 40 h(TFOT5 h + PAV40 h)and 60 h(TFOT5 h + PAV60 h). The results show that the Jnr of GRS modified asphalt is the smallest, and the Jnr of SBS modified asphalt is the largest under the same creep loading stress at the same temperature. GRS modified asphalt has better deformation resistance at high temperature. The R3.2 kPa,of GRS modified asphalt is the largest, and its Jnr3.2 kPa and sensitivity to thermo-oxidative aging are the smallest after 60 hours of PAV aging.