腐蚀老化对聚乙烯丙纶卷材搭接区抗拉性能的影响  

Effect of corrosion aging on the tensile properties of the lap zone of polyethylene polypropylene fiber

作　　者：刘晓庆 王海彦 李君君[3] 孔超 任松波 刘传涛[6] LIU Xiaoqing;WANG Haiyan;LI Junjun;KONG Chao;REN Songbo;LIU Chuantao(Sifang College,Shijiazhuang Tiedao University,Shijiazhuang 051132,China;School of Transportation Engineering,Nanjing Tech University,Nanjing 211816,China;Shijiazhuang Institute of Railway Technology,Shijiazhuang 050041,China;School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China;Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province,Southwest University of Science and Technology,Mianyang 621010,China;China Railway 18th Bureau Group construction and installation Engineering Co.,LTD,Tianjin 300308,China)

机构地区：[1]石家庄铁道大学四方学院,河北石家庄051132 [2]南京工业大学交通运输工程学院,江苏南京211816 [3]石家庄铁路职业技术学院,河北石家庄050041 [4]西南科技大学土木工程与建筑学院,四川绵阳621010 [5]西南科技大学工程材料与结构冲击振动四川省重点实验室,四川绵阳621010 [6]中铁十八局集团建筑安装工程有限公司,天津300308

出　　处：《西安理工大学学报》2021年第1期136-142,共7页Journal of Xi'an University of Technology

基　　金：国家自然科学基金青年基金资助项目(51708467);河北省科技厅重点研发计划自筹课题资助项目(17275509);河北省人才培养工程经费资助科研项目(A2017002037)。

摘　　要：针对腐蚀环境下聚乙烯丙纶防水层搭接薄弱区所存在的抗力性能退化问题,本文开展了聚乙烯丙纶卷材单片及搭接试件的人工加速腐蚀与静力拉伸试验,基于材料力学与损伤力学基本原理,分析了腐蚀老化作用对搭接区黏结强度、有效变形及抗拉能力的影响,并构建了考虑搭接尺寸、工艺以及环境氧化侵蚀综合作用的聚乙烯丙纶防水卷材搭接区的有效变形计算模型。研究结果表明:腐蚀对聚乙烯丙纶搭接试件抗拉性能的影响远大于单片试件;腐蚀持续时间越长,试件搭接区黏结强度退化越显著;腐蚀引起搭接区黏结强度退化,造成其抗拉承载能力退化,引起其有效伸长率降低,最大降幅可达75%;通过对比理论与试验值发现,预测模型能够实现搭接区有效伸长率的精确预测。Aiming at the degradation of the resistance performance of the polyethylene polypropylene fiber waterproof layer in the weak area of the lap in the corrosive environment,the artificial accelerated corrosion and static tensile tests of the polyethylene polypropylene fiber sheet and the lap specimen are carried out.Based on the basic principles of material mechanics and damage mechanics,the influence is analyzed of corrosion and aging on the bonding strength,effective deformation and tensile capacity of the overlap zone,with the effective deformation calculation model for the polyethylene polypropylene fiber waterproofing membrane lap area considering the combined effect of lap size,process and environmental oxidation and erosion constructed.The research results show that the impact of corrosion on the tensile properties of the polyethylene polypropylene fiber lapped specimen is much greater than that of the single-piece specimen;the longer the corrosion duration,the more significant the bond strength degradation in the lap area of the specimen;corrosion causes degradation of the bonding strength of the lap area,resulting in degradation of its tensile load-bearing capacity and a decrease in its effective elongation,with a maximum decrease of 75%;by comparing theoretical and experimental values,it is found that the prediction model can accurately predict the effective elongation of the overlap zone.

关 键 词：搭接薄弱区 腐蚀老化作用 黏结强度 抗拉能力 有效伸长率 

分 类 号：TU57[建筑科学—建筑技术科学]