摘要
研究了PVC防水卷材在持续荷载作用下的应力松弛特性。自行设计了应力松弛试验装置和试验方法,研究了不同温度和不同初始拉伸率条件下,卷材的应力损失率和持荷时间的关系曲线。结果表明:PVC卷材表现出快速的应力松弛特性。随着初始拉伸率的增大,卷材的应力松弛速度加快、应力损失率加大;随着温度的升高,卷材的最终应力损失率也增大。
This article studies the behavior of stress relaxation of PVC waterproofing membrane under sustained load and introduces the experimental equipment and method developed for the study.The plots of stress reduction rate of the membrane against time load sustained under various temperatures and initial tensile stress were made.The results show that PVC exhibits rapid stress relaxation.As the initial tensile stress increases the stress relaxation quickens and stress reduction rate increases.With rise of the temperature the final stress reduction of the membrane gets more.
出处
《中国建筑防水》
2011年第1期8-12,共5页
China Building Waterproofing
关键词
PVC防水卷材
应力松弛
应力损失率
初始拉伸率
温度
PVC waterproofing membrane
stress relaxation
stress reduction rate
initial tensile stress
temperature
