再生PE改性沥青混合料高温性能研究

发布时间：2018-10-12 17:27

【摘要】：采用车辙、单轴静压蠕变和重复加载蠕变试验,对比分析PE改性沥青混合料老化前后及再生前后的高温性能,并评价再生后PE改性剂的改性效果。首先对PE改性沥青混合料进行级配设计并确定其最佳沥青用量;然后,对PE改性沥青混合料进行试验室模拟短期老化和长期老化,测试老化PE改性沥青混合料的高温性能;最后,对长期老化后的混合料,进行试验室模拟热再生,再生时,新料分别采用PE改性沥青混合料和普通70#道路沥青混合料,试验对比两类再生沥青混合料及老化前后PE改性沥青混合料的高温稳定性能。结果表明:旧PE改性沥青混合料经不同方式再生后其高温流动性能可获得不同程度的恢复,其中70#普通沥青的作用更为明显,这也说明PE改性沥青对再生沥青混合料仍发挥着改善高温稳定性的作用。
[Abstract]:The high temperature properties of PE modified asphalt mixture before and after aging and before and after regeneration were analyzed by means of rutting, uniaxial static pressure creep test and repeated loading creep test, and the modification effect of PE modifier after regeneration was evaluated. Firstly, the gradation design of PE modified asphalt mixture is carried out and the optimum asphalt content is determined. Then, the PE modified asphalt mixture is simulated in laboratory to simulate short term aging and long term aging to test the high temperature performance of aging PE modified asphalt mixture. Finally, for the long-aged mixture, the laboratory simulated hot regeneration. When the new material was regenerated, the PE modified asphalt mixture and the ordinary 70# road asphalt mixture were used respectively. The high temperature stability of two kinds of recycled asphalt mixture and PE modified asphalt mixture before and after aging were compared. The results show that the high temperature fluidity of the old PE modified asphalt mixture can be recovered in different ways, and the effect of 70# ordinary asphalt is more obvious. It also shows that PE modified asphalt still plays an important role in improving the high temperature stability of recycled asphalt mixture.
【作者单位】：长沙理工大学道路结构与材料交通行业重点实验室;
【基金】：国家自然科学基金资助项目(编号:51178065)
【分类号】：U414

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