基于室内模拟试验的SBS改性沥青混合料抗老化性能评价

隋严春

济南市规划设计研究院，山东 济南  250101

摘要：为准确评价苯乙烯-丁二烯-苯乙烯（styrene-butadiene-styrene，SBS）改性沥青混合料在长期服役过程中的老化问题，结合路面所处的气候环境条件，提出基于环境因素的室内模拟老化评价方法，对SBS改性沥青混合料进行室内加速老化试验，通过低温弯曲小梁试验、车辙试验及冻融劈裂试验评价老化后SBS改性沥青混合料的低温性能、抗永久变形能力及水稳定性。试验结果表明：在长期服役过程中，紫外-热氧耦合老化对SBS改性沥青混合料路用性能的影响比独立热氧老化更大，热氧老化对低温性能的影响大于紫外老化，紫外老化对高温、水稳定性的影响均比热氧老化大，因此采用紫外-热氧耦合老化模拟试验方法更能真实反映夏季户外路面状态，比热氧老化评价方法更合理。

关键词：SBS改性沥青混合料；紫外-热氧耦合老化；路用性能；抗老化性能评价

Aging resistance evaluation of SBS modified asphalt mixture based on the laboratory simulation test

SUI Yanchun

Jinan City Planning and Design Institute, Jinan 250101, China

Abstract:In order to exactly evaluate the aging problem of styrene-butadiene-styrene (SBS) modified asphalt mixture in the long-term service process, combined with the climatic and environmental conditions of the pavement, the laboratory simulation test based on environmental factors is proposed. Laboratory accelerated aging test of SBS modified asphalt mixture is carried out, and the low temperature performance, anti-permanent deformation ability and water stability of the aging SBS modified asphalt mixture are evaluated by low temperature bending girder test, rutting test and freeze-thaw cleavage test. The experimental results show that in the long-term service process, the influence of UV-thermal coupling aging on the performance of SBS modified asphalt mixture is greater than that of independent thermal oxygen aging, the impact of thermal oxygen aging on its low temperature performance is greater than that of ultraviolet aging, and the impact of UV aging on its high temperature and water stability is greater than that of thermal oxygen aging. The simulation test method of UV-thermal coupling aging can more truly reflect the outdoor pavement state in summer, which is more reasonable than the evaluation method of thermal oxygen aging.

Keywords:SBS modified asphalt concrete; UV-thermal coupling aging; road performance; evaluation of aging resistance