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改性剂对高RAP掺量热再生混合料性能的影响研究
作者：孙伟清1，徐伟良2
（1.杭州科技职业技术学院 城市建设学院，浙江 杭州 311402；2.浙江工业大学 教育科学与技术学院，浙江 杭州 310014）
摘要：研究了木质素、聚酯纤维、硅藻土、干拌直投废轮胎胶粉4种改性剂对热再生混合料性能的影响。结果表明，掺加4种改性剂能明显提高热再生混合料的路用性能、水稳定性、抗松散性能与疲劳耐久性，对综合路用性能改善效果的排序为：干拌直投废轮胎胶粉＞聚酯纤维＞硅藻土＞木质素纤维，干拌直投废轮胎胶粉、聚酯纤维、硅藻土分别对热再生混合料的高温性能、低温性能、水稳定性改善效果最佳。
关键词：热再生沥青混合料；木质素；聚酯纤维；硅藻土；干拌直投废轮胎胶粉；性能
中图分类号：TU535 文献标识码：A 文章编号：1001-702X（2021）02-0042-05
Effect of modifiers on performance of high RAP asphalt recycled mixture
SUN Weiqing1，XU Weiliang2
（1.Hangzhou Polytechnic Institute of Urban Construction，Hangzhou 311402，China；
2.School of Educational Science and Technology，ZheJiang University of Technology，Hangzhou 310014，China）
Abstract：The effects of lignin，polyester fiber，diatomaceous earth，and dry-mixed direct input waste tire rubber powder on the properties of hot recycled asphalt mixture were studied. The results show that the addition of above 4 modifiers can significantly improve the comprehensive road performance，water stability，anti-loose performance and fatigue durability of the hot recycled mixture. The improvement effect of the four modifiers on the comprehensive road performance of the heat-recycled mixture：dry-mixed direct-throw waste tire rubber powder>polyester fiber>diatomaceous earth>lignin fiber，dry-mixed direct-throw waste tire rubber powder polyester fiber and diatomaceous earth have the best effect on improving the high-temperature performance，low-temperature performance and water stability of the thermal regeneration mixture.
Key words：heat-recycled mixture，lignin，polyester fiber，diatomaceous earth，dry-mixed direct-throw waste tire rubber powder，performance