聚合物改性热再生沥青混合料性能评价

Performance Evaluation of Hot Recycled Asphalt Mixtures using Polymer Modified Bitumen

厂拌热再生技术是一种用于高效回收沥青混合料(RAP)的新型技术。使用再生材料的关键挑战在于恢复材料在使用过程中损失的性能。为提高热再生沥青路面的性能并增加旧料的循环利用率,本研究采用SBS改性沥青对再生沥青混合料进行改性。首先,根据不同的沥青类型和旧料掺量,制备了四种不同的沥青混合料;其次,通过室内试验对这些混合料的力学性能和路用性能进行对比分析。结果表明,与常规沥青混合料相比,热再生沥青混合料在高温稳定性、抗剪切性和抗变形能力方面表现出显著的提升,其低温抗裂性能、水稳性和疲劳性能有所降低。采用SBS改性的热再生沥青混合料在各项性能指标上均优于未改性的热再生沥青混合料。进一步研究发现,当RAP掺量达到30%时,SBS改性热再生沥青混合料的性能仍然能够满足相关规范要求。这一发现为SBS改性沥青在热再生技术中的应用提供了有力的依据。

Plant-mixed hot recycling technology is an innovative method for efficiently reclaiming asphalt mixtures(RAP).The key challenge in using recycled materials lies in restoring the properties that have degraded during service.To enhance the performance of hot-recycled asphalt pavements and increase the recycling rate of old materials,this study employed SBS-modified asphalt to improve the properties of the recycled asphalt mixture.First,four different asphalt mixtures were prepared based on various asphalt types and RAP contents.Then,their mechanical and road performance were compared through laboratory tests.The results showed that,compared to conventional asphalt mixtures,hot-recycled asphalt mixtures exhibited significant improvements in high-temperature stability,shear resistance,and deformation resistance.However,their low-temperature crack resistance,moisture stability,and fatigue performance were somewhat diminished.Nevertheless,the SBS-modified hot-recycled asphalt mixtures outperformed the unmodified hot-recycled mixtures across all performance indicators.Further research revealed that when the RAP content reached 30%,the performance of the SBS-modified hot-recycled asphalt mixture still met the relevant specification requirements.This finding provides strong support for the application of SBS-modified asphalt in hot recycling technology.