聚氨酯钢桥面铺装防水粘结层剪切疲劳性能研究  

Research on the Shear Fatigue Performance of the Waterproof Adhesive Layer in Polyurethane Steel Bridge Deck Pavement

作　　者：范钟亓 单浩睿 王子晗 吕欣芃 Fan Zhongqi;Shan Haorui;Wang Zihan;LüXinpeng(School of Ciwil and Transportation Engineering,Beijing University of Ciwil Engineering and Architecture,Bejing 100044,China;RoadMaint Co.,Ltd.,Beijing 100095,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]中公高科养护科技股份有限公司,北京100095

出　　处：《市政技术》2024年第5期181-186,206,共7页Journal of Municipal Technology

基　　金：国家自然基金项目(51978035,52278425)。

摘　　要：聚氨酯混合料桥面铺装材料具有优异的综合路用性能,有望解决传统沥青类钢桥面铺装材料在钢桥严苛使用环境下耐久性差、使用寿命短等问题,但目前对与之相匹配的防水粘结层材料的研究还很少。因此,针对2种防水粘结层材料(聚氨酯、环氧树脂)进行剪切疲劳试验,以分析温度和应力对防水粘结层剪切疲劳寿命的影响。研究结果表明:在-10~70℃的温度区间内,2种防水粘结层的剪切疲劳寿命均呈现缓慢—快速—缓慢下降的趋势。在相同应力比和温度下,聚氨酯防水粘结层的剪切疲劳寿命是环氧树脂防水粘结层的1.02~1.40倍,表明聚氨酯防水粘结层抗剪切破坏能力更强,更适宜作为聚氨酯钢桥面铺装结构的防水粘结层。在不同温度下,2种防水粘结层的剪切疲劳寿命均随着应力比的增加而下降,且中温区(10~25℃)和高温区(50~70℃)剪切疲劳寿命对应力作用的敏感性要显著高于低温区(-10~0℃)。Because of excellent comprehensive road performance,the polyurethane blend bridge deck pavement material is expected to solve the poor durability and short service life of traditional asphalt-based steel bridge deck pavement materials in harsh environments for steel bridge.However,there is litle research on the matching water-proof adhesive layer material at present.Therefore,shear fatigue tests were conducted for two types of waterproof adhesive layer materials(polyurethane and epoxy resin)to analyze the effects of temperature and stress on the shear fatigue life of the waterproof adhesive layer.The research results showed that both the shear fatigue lives of two types of waterproof layers show a slow-rapid-slow decrease trend within the temperature range of-10 to 70 C.Under the same stress ratio and temperature,the shear fatigue life of the polyurethane waterproof adhesive layer is 1.02~1.40 times greater than that of the epoxy resin waterproof adhesive layer,which indicates that the polyurethane water-proof adhesive layer has stronger shear resistance and is more suitable to be the waterproof adhesive layer for the polyurethane steel bridge deck pavement structure.Under different temperatures,both the fatigue lives of the two waterproof adhesive layers decrease with the stress ratio increases.The sensitivity of shear fatigue life to stress during the mid-temperature range(10~25°C)and high-temperature range(50~70°C)is significantly higher than that during the low-temperature range(-10~0°C).

关 键 词：聚氨酯 钢桥面铺装 防水粘结层 剪切疲劳寿命 

分 类 号：U443.33[建筑科学—桥梁与隧道工程]