掺废轮胎橡胶颗粒碎石封层黏结性研究  

Bonding Performance of Chip Seal Containing Waste Tire Rubber Particles

作　　者：陈建民 刘东海 王锦余 刘浩志 CHEN Jianmin;LIU Donghai;WANG Jinyu;LIU Haozhi(Hunan Provincial Communications Planning Survey&Design Institute Co.,Ltd.,Changsha,Hunan 410200,China;Hunan Chajiang Expressway Construction and Development Co.,Ltd.,Changsha,Hunan 410204,China;School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha,Hunan 410014,China)

机构地区：[1]湖南省交通规划勘察设计院有限公司,湖南长沙410200 [2]湖南省茶江高速公路建设开发有限公司,湖南长沙410204 [3]长沙理工大学交通运输工程学院,湖南长沙410014

出　　处：《中外公路》2024年第4期127-137,共11页Journal of China & Foreign Highway

基　　金：长沙理工大学道路结构与材料交通行业重点实验室开放基金资助项目(编号:No.kfj210301)。

摘　　要：为提高废旧轮胎的再利用率,降低环境污染,将废轮胎橡胶颗粒等体积替换碎石制备新型橡胶颗粒碎石封层路面。通过橡胶颗粒表面的处理,确保橡胶颗粒碎石封层沥青‒集料间的黏附性,对不同集料粒径及橡胶掺量的碎石封层试件纹理特性进行评价,将橡胶颗粒掺量、集料粒径占比、脱落率、构造深度及摆式摩擦系数5个指标通过SPSS进行关联并评价,并以MMLS3试验模拟行车荷载,探究外界水温对其黏附强度的影响特性。研究结果表明:采用1.5%热沥青预裹覆的橡胶颗粒可有效改善碎石封层的集料脱落;脱落率与构造深度会伴随7.1~9.5 mm粒径占比及橡胶颗粒比例的增加有所上升;摆式摩擦系数与橡胶颗粒掺量增高呈现相反趋势;低温单因素对碎石封层集料脱落的影响大于高温和浸水,而水‒温耦合会使集料松散性加剧;整体而言,为确保碎石封层集料与沥青间具有较好的黏附强度,橡胶颗粒掺量与热沥青裹覆用量分别不宜超过50.0%、1.5%。In order to promote the reuse of waste tires and reduce environmental pollution,chips were replaced with the same volume of waste tire rubber particles to prepare a new rubber particle chip seal pavement.In order to ensure the bonding between asphalt and aggregate of the rubber particle chip seal,the surface of rubber particles was processed,and the texture characteristics of chip seal specimens with different aggregate particle sizes and rubber content were evaluated.The five indexes of rubber particle content,aggregate particle size ratio,shedding rate,structural depth,and pendulum friction coefficient were correlated and evaluated by SPSS,and the MMLS3 test was conducted to simulate the driving load,so as to explore the influence of external water temperature on the bonding strength.The results show that the rubber particles pre-coated with 1.5% hot asphalt can effectively improve the aggregate shedding of the chip seal.The shedding rate and structural depth will increase with the increase in particle size in the range of 7.1‒9.5 mm and rubber particle ratio.The pendulum friction coefficient shows the opposite trend with the increase in rubber particle content.The influence of lowtemperature single factor on the aggregate shedding of the chip seal is greater than that of high temperature and water immersion,while water-temperature coupling will aggravate the looseness of aggregates.Overall,in order to ensure that the chip seal aggregate and asphalt have good bonding strength,the rubber particle content and the amount of hot asphalt for coating should not exceed 50.0% and 1.5%,respectively.

关 键 词：碎石封层 废旧轮胎橡胶 黏附特性 回收利用 绿色路面 

分 类 号：U414[交通运输工程—道路与铁道工程]