摘要
基于路用性能试验与间接拉伸疲劳试验,对比分析沥青种类(基质沥青、SBS改性沥青、SBR改性沥青)和纤维种类(木质素纤维、聚酯纤维、玄武岩纤维)对高RAP掺量热再生沥青混合料路用性能、抗疲劳性能的增强效果。结果表明:对高温性能的增强效果排序为玄武岩纤维>聚酯纤维>木质素纤维,对低温抗裂性能的增强效果排序为聚酯纤维>木质素纤维>玄武岩纤维,对疲劳性能的增强效果排序为木质素纤维>玄武岩纤维>聚酯纤维;SBS改性沥青可显著提高热再生沥青混合料的高温稳定性与抗疲劳耐久性能,SBR改性沥青对热再生沥青混合料低温性能改善效果最显著,实体工程中可根据项目所在地气候分区路用性能改性侧重点,选择沥青胶结料和纤维种类。
In order to enhance the low temperature cracking resistance,water stability and fatigue resistance of the high RAP thermal recycled asphalt mixture,Based on rut test,low temperature trabecular bending test,immersion Marshall test,freeze-thaw splitting test and indirect tensile fatigue test,the enhancement effects of asphalt types(matrix asphalt,SBS modified asphalt,SBR modified asphalt)and fiber types(lignin fiber,polyester fiber,basalt fiber)on road performance and fatigue resistance of high RAP content heat reclaimed asphalt mixture were analyzed A result.The results show that the enhancement effect of high temperature properties is ranked as basalt fiber>polyester fiber>lignin fiber,the enhancement effect of low temperature cracking resistance is ranked as polyester fiber>lignin fiber>basalt fiber,and the enhancement effect of fatigue properties is ranked as lignin fiber>basalt fiber>polyester fiber.The use of SBS modified asphalt significantly improves the high temperature stability and anti-fatigue durability of hot reclaimed asphalt mixture,while SBR modified asphalt has the most significant effect on the low temperature performance of hot reclaimed asphalt mixture.In solid projects,asphalt binder and fiber types can be selected according to the key points of road performance modification in the climate zone of the project lacation.
作者
苏震
SU Zhen(China Railway 18th Bureau Group the 4th Engineering Co.,Ltd.,Tianjin 300300,China)
出处
《路基工程》
2025年第3期78-84,共7页
Subgrade Engineering
关键词
沥青路面
沥青混合料
掺量
路用性能
耐久性
稳定性
asphalt pavement
asphalt mixture
amount of admixture
road performance
durability
stability
