环氧沥青混合料钢桥面铺装层裂缝类病害机理分

关键字：环氧沥青,混合料,钢桥面,铺装层,裂缝,病害,机理

（1.中国电建集团贵阳勘测设计研究院有限公司，贵州 贵阳  550001；
2.贵州省交通规划勘察设计研究院股份有限公司，贵州 贵阳  550000；3.田纳西大学，美国 诺克思维尔  37996）

    摘要：以贵州省坝陵河特大桥环氧沥青混合料钢桥面铺装层裂缝类病害为对象，采用凝胶渗透色谱（GPC）和傅里叶变换红外光谱（FTIR）从分子尺度对环氧沥青混合料钢桥面铺装层裂缝类病害产生机理进行分析。结果表明，由于钢桥面铺装层粘结层环氧沥青的固化反应不完全，造成了层间粘结能力的丧失，引发了自上向下的开裂，最终贯穿铺装结构形成块状裂缝或龟裂。
    关键词：钢桥面铺装；环氧沥青；裂缝类病害；机理分析
    中图分类号：TU535        文献标识码：A        文章编号：1001-702X（2017）12-0077-05

Analysis on failure mechanism of cracking distress on steel bridge deck epoxy asphalt overlay
SHAN Hongyu1，LI Qian1，YE Qing2，MI Linyuan2，JIA Xiaoyang3
（1.GuiYang Engineering Corporation Limited，Power China，Guiyang 550001，China；
2.Guizhou Province Transportation Planning Survey and Design Institute Co. Ltd.，Guiyang 550000，China；
3.The University of Tennessee-Knoxville，Knoxville，TN 37996，U.S.A.）

    Abstract：The cracking distress on Balinghe steel bridge in Guizhou Province was investigated in this paper. Failure mechanism of cracking distress on steel bridge deck epoxy asphalt overlay was analyzed through Gel Permeable Chromatography（GPC） and Fourier Transform Infrared（FTIR） microscope at molecular dimension. Results indicated that the loss of bonding ability between layers were on account of incomplete chemical reaction of interlayer between epoxy asphalt layers. The crack generated from top to bottom，propagated downwards and formed block cracking and fracturing.
    Key words：steel bridge deck overlay，epoxy asphalt，cracking distress，mechanism analysis