Mechanical properties of epoxy asphalt mixture pavement with lightweight aggregate applied on bascule bridge  

用于开启桥的轻质环氧沥青混凝土桥面铺装力学性能(英文)

作　　者：刘云[1,2] 钱振东[2] 张磊[2] 江陈龙 

机构地区：[1]河海大学土木与交通学院,南京210098 [2]东南大学智能运输系统研究中心,南京210096 [3]林同炎国际工程咨询有限公司,重庆401121

出　　处：《Journal of Southeast University(English Edition)》2012年第3期321-326,共6页东南大学学报（英文版）

基　　金：China Postdoctoral Science Foundation(No. 20110491342);Jiangsu Postdoctoral Science Foundation(No. 1101018C);the National Natural Science Foundation of China(No. 51178114,50908054)

摘　　要：The high temperature anti-rutting performance,water stability and low temperature bending property of epoxy asphalt mixture with 0%,15%,25%,40%,and 70% granulated and circular lightweight aggregates by weight are tested,respectively.The dynamic responses under the vehicle load and in the opening process are analyzed to obtain the mechanical responses of pavements by using the finite element method.The complicated structure including a steel deck and a waterproof adhesive layer is made to verify the bond strength of the 2451-type epoxy asphalt binder.Research results show that the epoxy asphalt mixtures with lightweight aggregate replacement percentages from 0% to 70% all satisfy the requirements for steel bridge pavements.The epoxy asphalt mixture with a 70% circular lightweight aggregate replacement percentage is recommended because of its smaller density when compared with other epoxy asphalt mixtures.The shear stress increases with the increase in the opening angle and achieves its maximum at the maximum opening angle of 85°.Test results show that the Tianjin Bascule Bridge can be used for first opening after a 3 d pavement conditioning.拟定质量替代百分数分别为0%,15%,25%,40%,70%的碎石型陶粒环氧沥青混合料和圆型陶粒环氧沥青混合料,进行高温抗车辙性能、水稳定性及低温弯曲性能试验.采用有限元方法分析开启桥在行车和开启2种状态下的力学响应.最后成型含钢桥面板、防水黏结层及环氧沥青混凝土的复合结构试件来验证2451型环氧沥青黏结料的界面黏结强度.研究结果表明,质量替代百分数分别为0%,15%,25%,40%,70%的陶粒环氧沥青混合料均能满足钢桥面铺装的力学性能要求.替代百分数为70%的圆型陶粒环氧沥青混合料由于其在减轻铺装质量等方面的优势被推荐为开启桥桥面铺装用的首选材料.桥面铺装层间剪应力随着开启角度的增大而增大,并在开启角度达到最大值85°时达到峰值.通过室内试验结果可知,天津响螺湾立转式开启桥在桥面铺装铺筑完成并养生3d后可进行首次开启.

关 键 词：bascule bridge steel bridge deck pavement lightweight aggregate mechanical response shear stress 

分 类 号：U443.33[建筑科学—桥梁与隧道工程]