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以韩国SK-90#沥青作为基质沥青,选用废旧LDPE与SBS作为改性剂制备SMA沥青混合料,通过室内试验,测试和评价沥青混合料的路用性能,分析LDPE与不同类型SBS改性剂对混合料性能的影响。应用有限元程序对LDPE/SBS复合改性沥青SMA混合料的路面结构力学响应规律进行研究,分析表征其性能效益的指标。研究结果表明:其混合料高温性能、低温性能与抗水损坏能力都有所提高,且LDPE与星型SBS复合改性沥青混合料的各项性能优于LDPE与线型SBS复合改性沥青混合料;使用LDPE/SBS复合改性沥青不仅能够提高路面使用寿命,而且可以优化路面结构,起到节约成本的目的。
Using SK-90 # asphalt as the base asphalt in Korea, the SMA asphalt mixture was prepared by using the waste LDPE and SBS as the modifier. The indoor performance of the asphalt mixture was tested and evaluated. The effects of LDPE and different types of SBS modifier The impact on the performance of the mixture. The mechanical response of pavement structure of LDPE / SBS modified SMA composites was studied by finite element program, and the indexes to characterize its performance and benefit were analyzed. The results show that the properties of high temperature performance, low temperature performance and water damage resistance of the mixture increase, and the performance of LDPE and Star SBS composite modified asphalt mixture is better than that of LDPE and linear SBS composite modified asphalt The use of LDPE / SBS composite modified asphalt can not only improve the service life of pavement, but also optimize the pavement structure and save cost.