高温多雨地区高模量沥青混合料性能研究

Study of the performance of high modulus modified asphalt mixture in hot and rainy areas

高温多雨地区多重不利因素的叠加加速了沥青路面性能的衰减。文章采用掺加PRM和PRS的2种高模量沥青混合料对水稳定性,高温、水热稳定性,疲劳、低温性能,以及动静模量、直接剪切试验进行研究,对高温多雨地区高模量沥青混合料性能系统地进行评价。结果表明:与基质沥青混合料和SBS沥青混合料相比,PRM和PRS 2种高模量沥青混合料有较好的水稳定性、高温稳定性和疲劳性能,在水-热综合作用下有良好的抵抗变形能力,同时低温性能也略有改善,沥青混合料的动、静态模量以及抗剪强度有大幅提高。文章研究认为机械嵌挤作用和纤维网约束力可以改善混合料整体性能,吸收、吸附作用和界面层作用有利于改善沥青的高温和低温性能。

The asphalt pavement performance degradation is worsen by superposition of multiple ad- verse factors in hot and rainy areas. The performance of high modulus asphalt mixtures modified with PRM and PRS respectively was evaluated systematically by water stability, high temperature and hot- water synthetical stability, fatigue and low temperature performance tests and dynamic and static modulus and shear tests. The results showed that compared with virgin asphalt and styrene-butadiene- styrene（SBS） mixture, PRS and PRM mixtures had better water stability, high temperature stability, hot-water synthetical stability and fatigue property~ the low temperature performance of mixtures was improved lightly. On the other hand, dynamic and static modulus and shear strength of PRM and PRS asphalt mixtures were improved significantly. It was put forward that wedging force and fiber network improved the performances of mixtures. Absorbency and interface layer effect improved the high tem- perature and low temperature performance of asphalt binders.