Abstract: The high and low temperature rheological properties of 90# matrix asphalt mastic, SBR modified asphalt mastic and PPA/SBR modified asphalt mastic with powder to binder ratios of 0.6, 0.9 and 1.2 before and after UV aging was studied by high temperature scanning test and BBR low temperature creep test. The high and low temperature performance of asphalt mixture before and after UV aging was analyzed by use of high-temperature rutting test and low-temperature small beam bending test. Meanwhile, the rutting factor aging index ASTA, creep stiffness aging index SAI, creep rate aging index mAI, dynamic stability aging index DAI and bending stiffness modulus aging index SBAI were also introduced to quantitatively analyze the anti-ultraviolet aging of asphalt mastic and asphalt mixture. The results show that the high-temperature deformation resistance of asphalt mortar is improved after UV aging, but the low-temperature crack resistance of asphalt mortar is significantly reduced after UV aging. For asphalt mixture, the high-temperature rutting resistance of 90# matrix asphalt mixture and SBR modified asphalt mixture is deteriorated by UV aging, the rutting resistance of PPA/SBR modified asphalt mixture is improved, while the low-temperature crack resistance decreases obviously after UV aging. However, PPA/SBR modified asphalt mixture exhibits the best low-temperature crack resistance both before and after UV aging. It is indicated that addition of PPA can effectively improve the high-temperature deformation resistance, low-temperature cracking resistance, and UV aging resistance of SBR modified asphalt mortar and asphalt mixture. The research results show that PPA/SBR asphalt material is very suitable for extremely cold and high-altitude areas.

Key words: highway engineering; PPA/SBR modified asphalt mastic; asphalt mixture; UV aging; high and low temperature performance

摘要： 通过高温温度扫描试验、BBR低温蠕变试验对粉胶比为0.6、0.9、1.2的90#基质沥青胶浆、SBR改性沥青胶浆及PPA/SBR改性沥青胶浆紫外老化前后的高低温流变性能进行了研究，利用高温车辙试验及低温小梁弯曲试验对其紫外老化前后的沥青混合料高低温性能进行分析，同时引入沥青胶浆的车辙因子老化指数ASTA、蠕变劲度老化指数SAI、蠕变速率老化指数mAI，沥青混合料动稳定度老化指数DAI、弯曲劲度模量老化指数SBAI对沥青胶浆及沥青混合料的抗紫外老化性能进行定量分析，结果表明：紫外老化会提高沥青胶浆的高温抗变形能力，而显著降低沥青胶浆的低温抗裂性。而对于沥青混合料而言，紫外老化劣化了90#基质沥青混合料及SBR改性沥青混合料的高温抗车辙性能，提高了PPA/SBR改性沥青混合料的抗车辙性能，而低温抗裂性在紫外老化后均出现了明显下降，但PPA/SBR改性沥青混合料紫外老化前后都具有最佳的低温抗裂性能。说明PPA的掺入有效提高了SBR改性沥青胶浆及沥青混合料的高温抗变形能力、低温抗裂性能及抗紫外老化性能。研究成果表明：PPA/SBR沥青材料非常适用于高寒高海拔地区。

关键词: 道路工程；PPA/SBR改性沥青胶浆；沥青混合料；紫外老化；高低温性能