无损状态下钢桥面沥青铺装材料变形恢复特性  

Characterization of Recovery Properties of Steel Bridge Pavement Asphalt Materials on Non-destructive Test

作　　者：王民 樊向阳[3,4] 王滔[1] 罗蓉 胡德勇 石晨光[3,4] WANG Min;FAN Xiangyang;WANG Tao;LUO Rong;HU Deyong;SHI Chenguang(Chongqing Zhixiang Paving Technology Engineering Co.,Ltd.,Chongqing 401336,China;China Merchants Chongqing Communications Research and Design Institute Co.,Ltd.,Chongqing 400067,China;School of Transportation,Wuhan University of Technology,Wuhan 430063,China;Hubei Highway Engineering Research Center,Wuhan 430063,China)

机构地区：[1]重庆市智翔铺道技术工程有限公司,重庆401336 [2]招商局重庆交通科研设计院有限公司,重庆400067 [3]武汉理工大学交通学院,武汉430063 [4]湖北省公路工程技术研究中心,武汉430063

出　　处：《材料导报》2021年第S01期269-273,共5页Materials Reports

基　　金：重庆市科技创新领军人才支持计划(CSTCCXLJRC201902);重庆市科技计划项目(社会事业与民生保障科技创新专项)(cstc2015shmszx30027);湖北省交通科技项目(2016-600-2-2)。

摘　　要：钢桥面铺装用高性能材料的组成及性能差异较大,目前对钢桥面铺装材料性能的研究主要集中在加载阶段的强度规律及损伤行为,而对卸载阶段材料的变形恢复特性研究甚少。为评价钢桥面铺装材料在卸载阶段的变形恢复能力,针对蠕变逐级加载试验方法存在的不足,提出了重复蠕变逐级加载恢复试验,对浇注式沥青混合料、环氧沥青混合料、沥青玛蹄脂碎石混合料三种典型钢桥面铺装材料,在卸载阶段不同时刻的内应力及对应时刻的残余应变进行测试。根据恢复模量的定义,计算三个不同蠕变应力水平下的恢复模量,依次来评价三种材料驱动变形恢复的能力。同时,基于粘弹性基本理论,确定蠕变柔量的拟合参数,并计算不同间隔时间下三种材料的应变恢复率,评价其变形恢复的速度。试验结果表明:无损状态下材料的恢复模量不同于内应力,不随蠕变荷载大小的变化而变化,环氧沥青混合料的恢复模量最大,约为沥青玛蹄脂碎石混合料、浇注式沥青混合料的7倍和4倍,环氧沥青混合料材料自身驱动变形恢复的能力优于浇注式沥青混合料和沥青玛蹄脂碎石混合料;但在相同时间间隔时间下,浇注式沥青混合料的应变恢复率最快,在3.6 s内,应变恢复率即可达到82%。The composition and properties of high performance materials for steel bridge deck pavement are quite different,the research of perfor-mance of steel deck pavement material is mainly focused on the strength rule and damage behavior of the loading stage,and less research has been done on the deformation recovery characteristics of the material in the unloading phase.To evaluate the deformation recovery capacity of steel deck surfacing material during the unloading phase,repeated creep and step-loading recovery test was proposed to overcome the shortcomings of creep and step-loading recovery test.It was used to measure the internal stress and residual strain at different time of unloading phase of three typical steel bridge deck paving materials including gussasphalt,epoxy asphalt mixture and stone mastic asphalt.According to the definition of recovery modulus,the recovery modulus at three different creep stress levels was calculated,and the drive deformation recovery ability of the three materials was evaluated in turn.At the same time,based on the viscoelastic theory,the fitting parameters of creep flexibility were determined,and the strain recovery rate of three materials at different intervals were calculated,in order to evaluating the rate of deformation recovery.The results show that the recovery modulus of the materials in a non-destructive state are different from the internal stress,and do not change with the size of the creep load.The epoxy asphalt mixture has the largest recovery modulus,which is about 7 times and 4 times that of the stone mastic asphalt and gussasphalt,and the drive deformation recovery ability of epoxy asphalt mixture is better than gussasphalt and stone mastic asphalt.But at the same interval,the strain recovery rate of gussasphalt is the fastest,and can reach 82%within_(3).6 s.

关 键 词：钢桥面铺装材料 浇注式沥青混合料 变形恢复 内应力 恢复模量 应变恢复率 

分 类 号：U416[交通运输工程—道路与铁道工程]