二阶热固性环氧沥青桥面铺装黏层黏结性能试验研究  

Experimental Study on Adhesive Performance of Second-Order Thermosetting Epoxy Asphalt in Bridge Deck Pavement

作　　者：周昌栋 代明净 赵明宇 李志强 雷宇翔 丁庆军[4] ZHOU Changdong;DAI Mingjing;ZHAO Mingyu;LI Zhiqiang;LEI Yuxiang;DING Qingjun(Yichang Transportation Authority,Yichang,Hubei 443000,China;Yichang Urban Construction Investment and Development Co.,Ltd.,Yichang,Hubei 443000,China;School of Materials Science and Engineering,Shenyang Jianzhu University,Shenyang,Liaoning 110168,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan,Hubei 430070,China)

机构地区：[1]宜昌市交通运输局,湖北宜昌443000 [2]宜昌市城市建设投资开发有限公司,湖北宜昌443000 [3]沈阳建筑大学材料科学与工程学院,辽宁沈阳110168 [4]武汉理工大学硅酸盐建筑材料国家重点实验室,湖北武汉430070

出　　处：《中外公路》2024年第3期129-136,共8页Journal of China & Foreign Highway

基　　金：国家自然科学基金资助项目(编号:U21A20149);硅酸盐建筑材料国家重点实验室开放基金资助项目(编号:SYSJJ2020-07);沈阳市中青年科技创新人才支持计划项目(编号:RC220313);辽宁省教育厅高校基本科研项目(编号:LJKMZ20220950)。

摘　　要：该文以宜昌伍家岗长江大桥为工程依托,针对铺装结构中RA沥青混凝土与高黏高弹SMA沥青混凝土层间的二阶热固性环氧沥青材料的不同洒布量、不同第一阶段固化时间、不同养护时间、不同服役温度下的界面抗剪与拉拔强度以及洒布量对耐剪切疲劳性能的影响开展研究。研究结果表明:随着二阶热固性环氧沥青洒布量的增加,黏结与抗剪强度提高,结构耐剪切疲劳性能增强,施工环境温度为25~35℃时,二阶热固性环氧沥青黏结层与高黏高弹SMA的施工间隔建议44~52 h,施工完成后封闭养护时间应大于7 d,二阶热固性环氧沥青黏层可实现组合铺装结构的25℃抗剪强度≥3.8 MPa,拉拔强度≥1.7 MPa,60℃抗剪强度≥1.7 MPa,拉拔强度≥0.9 MPa,研究结果对二阶热固性环氧沥青材料在桥面铺装工程中的应用具有指导意义。Based on the Wujiagang Yangtze River bridge project in Yichang,the interfacial shear strength and pull-out strength of the second-order thermosetting epoxy asphalt material between RA asphalt concrete and high viscoelastic SMA asphalt concrete in pavement structure were studied under different spraying amount,different first-stage curing time,different curing time,and different service temperatures.In addition,the influence of spraying amount on shear fatigue resistance was studied.The results show that with the increase in the spraying amount of the second-order thermosetting epoxy asphalt,the adhesive performance and shear strength are improved,and the shear fatigue resistance of the structure is enhanced.At a construction ambient temperature of 25‒35℃,the construction interval of second-order thermosetting epoxy asphalt layer and high viscoelastic SMA asphalt concrete is recommended to be 44‒52 h.Closed curing time after construction should be more than 7 days.The second-order thermosetting epoxy asphalt layer can achieve the shear strength of≥3.8 MPa and pull-out strength of≥1.7 MPa of the composite pavement structure at 25℃,as well as shear strength of≥1.7 MPa and pull-out strength of≥0.9 MPa at 60℃.The research results have guiding significance for the application of second-order thermosetting epoxy asphalt material in bridge deck paving engineering.

关 键 词：桥面铺装材料 二阶热固性环氧沥青 拉拔强度 剪切强度 黏结性能 

分 类 号：U443[建筑科学—桥梁与隧道工程]