沥青路面增强型基-面层层间黏结强度特性分析  

Analysis of bonding strength characteristics between reinforced base and surface layer of asphalt pavement

作　　者：何宏智 孟会林 刘一鸣[1,2] 任东亚[1,2] 艾长发[1,2] HE Hong-zhi;MENG Hui-lin;LIU Yi-ming;REN Dong-ya;AI Chang-fa(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,China;Key Laboratory of Highway Engineering of Sichuan Province,Southwest Jiao tong University,Chengdu 610031,Sichuan,China;Hebei Provincial Communications Planning,Design and Research Institute CO.LTD.,Shijiazhuang 050090,Hebei,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]西南交通大学道路工程四川省重点实验室,四川成都610031 [3]河北省交通规划设计研究院有限公司,河北石家庄050090

出　　处：《长安大学学报（自然科学版）》2022年第2期22-31,共10页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(51878574);河北省交通运输厅科技计划项目(RW-202002);环境适应型耐久性铺面结构与材料四川省青年科技创新研究团队(2021JDTD0023)。

摘　　要：为了探究增强型层间黏结强度的变化特性及引发该变化的影响特征,以PC-2型乳化沥青透层+纤维加强型橡胶改性沥青碎石封层的半刚性沥青路面基-面层层间黏结为研究对象,采用自制的剪切和拉拔装置,测试了10种透黏组合下的层间黏结强度,研究了层间强度整体增强效果及各阶段增长规律。同时基于温度区间划分和逆向建模技术,分析了温度区间、界面细观形态对层间强度变化的影响特征。结果表明:增强型层间黏结可以显著提升层间剪切和拉拔强度,且对常温、高温下拉拔强度的提升效果更为显著;相对于层间透层油,封层中橡胶改性沥青用量变化时对层间强度增长的贡献度更大,且“透、黏”2种材料均存在基于不同用量的分界点,并由此形成强度增长的两阶段特征;在不同温度区间,层间剪切强度与拉拔强度的变化趋势有差异,且在相对高温区间,这2种强度随温度升高而衰减的趋势更快;面积比K作为界面形态的表征参数,在层间剪切强度的发展过程中存在一个界限值95%,当超过这一界限值时,层间剪切强度不再随面积比值同步增长。To explore the change characteristics of reinforced interlayer bonding strength and the response characteristics that trigger the change,the semi-rigid asphalt pavement base-surface layer bonding of PC-2 emulsified asphalt permeable layer and fiber-reinforced rubber modified asphalt macadam sealing layer was taken as the object of study.The self-made shearing and pull-out devices were used to test the interlayer bonding strength under 10 combinations of prime coat and tack coat materials,the overall reinforced effect of the interlayer strength and its growth law at each stage were investigated.At the same time,based on temperature interval division and reverse modeling technology,the influence characteristics of temperature interval and mesoscopic interface morphology on the change of interlayer strength were analyzed.The results show that reinforced interlayer bonding significantly improves the interlayer shear and tensile strength,and the improvement effect on the tensile strength at room temperature and high temperature is more significant.Compared with the interlayer permeable oil,when the amount of rubber modified asphalt in the sealing layer changes,the contribution to the interlayer strength growth is greater,and both prime coat and tack coat materials have boundary points based on different amounts,thus forming a two-stage feature of strength growth.In different temperature ranges,the changing trends of interlayer shear strength and tensile strength are different,and in the relatively high temperature range,the two kinds of strengths have a faster attenuation trend with increasing temperature.The area ratio is used as a characterization parameter of the interface morphology,there exists a limit value of 95%during the development of the interlayer shear strength.Once this limit value is exceeded,the interlayer shear strength no longer increases simultaneously with the K value.6 tabs,5 figs,29 refs.

关 键 词：道路工程 半刚性沥青路面 层间黏结 强度特性 衰减效应 界面形态 

分 类 号：U416.217[交通运输工程—道路与铁道工程]