多次就地热再生沥青混合料性能提升研究  

Research on performance improvement of multiple hot in-place recycled asphalt mixture

作　　者：李宁 李龙 李进 孟令国[2] 李靖 LI Ning;LI Long;LI Jin;MENG Lingguo;LI Jing(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;Jiangsu Xiandai Road&Bridge Co.Ltd.,Nanjing 210018,China)

机构地区：[1]河海大学土木与交通学院,江苏南京210098 [2]江苏现代路桥有限责任公司,江苏南京210018

出　　处：《新型建筑材料》2025年第3期61-64,86,共5页New Building Materials

基　　金：国家重点研发计划项目(2021YFB2601200);江苏现代路桥有限公司科技项目(2022JKY18);中央高校基本科研业务费教师项目(B210202050)。

摘　　要：为提高多次就地热再生沥青混合料性能,在多次再生混合料中掺入高渗透型再生剂及玄武岩短切纤维,并测试其路用性能及疲劳性能。结果表明,随再生次数增加,SMA-13再生沥青混合料的高温性能提高,而低温性能、水稳定性及疲劳性能均降低。相较于常规再生剂,采用高渗透型再生剂的二次再生沥青混合料动稳定度降低了21.5%,最大弯拉应变、冻融劈裂强度比、浸水残留稳定度比分别提高了54.7%、2.9%、5.5%,在300με、350με、400με应变水平下的疲劳寿命分别提高了14.7%、7.9%、6.6%。掺入玄武岩短切纤维使三次再生沥青混合料在300με、350με、400με应变水平下的疲劳寿命分别提高了12.0%、3.1%、6.4%,但对其路用性能的改善幅度较小。In order to improve the performance of multiple hot in-place recycled mixtures,high permeability regenerants and basalt short-cut fibers were incorporated into the design of multiple recycled mixtures,and their road performance and fatigue performance were verified.The results show that the high-temperature performance of recycled asphalt mixtures increases with the increase of the number of recycling times,while the low-temperature performance,water stability and fatigue performance decrease with the increase of the number of recycling times.Compared with the conventional recycling agent,the dynamic stability of secondary recycled asphalt mixtures made with high penetration recycling agent decreased by 21.5%,the max flexural-tensile strain increased by 54.7%,the freeze-thaw splitting strength in water stability increased by 2.9%,the water-soaking residual stability ratio increased by 5.5%,and the fatigue performance increased by 14.7%,7.9%,and 6.6%at the strain levels of 300με,350με,and 400με,respectively.The addition of basalt short-cut fibers can improve the fatigue performance of tertiary recycled asphalt mixtures by 12.0%,3.1%,and 6.4%at 300με,350με,and 400μεstrain levels,respectively,but the improvement of their road performance is small.

关 键 词：道路工程 再生沥青混合料 多次再生 再生剂 玄武岩纤维 

分 类 号：TU535[建筑科学—建筑技术科学]