聚氨酯铺装材料的过早破坏机制研究  

Study on Premature Failure Mechanism of Polyurethane Paving Materials

作　　者：徐松 王叶飞 魏必成 袁燕[1] 阙云[1] 林存辉 XU Song;WANG Yefei;WEI Bicheng;YUAN Yan;QUE Yun;LIN Cunhui(College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China;Fujian Provincial Key Laboratory of Highway Engineering,Fuzhou 350108,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]华南理工大学土木与交通学院,广东广州510640 [3]福建省高速公路工程重点实验室,福建福州350108

出　　处：《湖南大学学报（自然科学版）》2024年第9期99-110,共12页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(52278446)

摘　　要：为了揭示聚氨酯胶结料的过早破坏机制,更好地优化配方和施工工艺,通过分析抗拉强度、剪切强度、黏结强度以及断裂伸长率、微观形貌和官能团,对聚氨酯胶结料的破坏机制进行规律总结.结果表明,老化480 h后,水热老化的断裂伸长率是热氧老化下降量的2.44倍,黏结强度和剪切强度的下降比例分别为热氧老化的4.01倍和8.95倍.并且,紫外老化对抗拉强度的削弱作用远大于后固化而增加的强度,其老化速率加快,抗拉强度下降速率也随之加快.此外,在路面施工过程中,应尽量保证水泥路面的含水率低于4%,降雨后干燥24 h左右便可继续施工,工期紧张时可以采用大功率落地式工业电风扇或者红外加热车等降低路面含水率,以确保聚氨酯胶结料的施工质量.To reveal the premature failure mechanism of polyurethane binder,it is used to optimize the formula and construction process.In this paper,by analyzing tensile strength,shear strength,bond strength,elongation at break,micro-morphology,and functional groups,the failure mechanism of polyurethane binder was summarized.The results showed that after 480 h aging,the elongation at break of hydrothermal aging was 2.44 times that of thermal oxygen aging,and the reduction ratio of bond strength and shear strength were 4.01 times and 8.95 times that of thermal oxygen aging,respectively.Moreover,the weakening effect of ultraviolet aging on tensile strength was much greater than the increase of strength after curing,and its aging rate was accelerated,resulting in an accelerated decrease in tensile strength.In addition,during the pavement construction process,it was necessary to ensure that the moisture content of cement pavement should be less than 4%as much as possible.Construction can continue after drying for about 24 h after rainfall.When the construction period is tight,a high-power floor-standing industrial fan or infrared heating truck can be used to reduce the water content of the road surface so as to ensure the construction quality of the polyurethane binder.

关 键 词：聚氨酯胶 破坏分析 材料老化 紫外老化 

分 类 号：U414[交通运输工程—道路与铁道工程]