- 目录
- 防水屋面材料
- 首页
预应变对装配式建筑用密封胶粘弹性的影响
作者：朱文凯，徐杨，任彬彬
（上海建科检验有限公司，上海 201100）
摘要：为了研究装配式建筑用密封胶的抗位移形变能力，使用应力松弛法测试密封胶表观弹性模量随时间的变化，分析在不同预应变m和不同松驰应变水平x下弹性密封胶的非线性粘弹特性。结果表明，当x<m时，密封胶弹性模量与时间呈幂函数关系，指数n与x的变化无关；对于同一个m值，应力松弛阶段100 s时的弹性模量E100与1/（1+x）呈线性关系，且对不同的m值，曲线的斜率相似；当x>m时，密封胶的形变行为更加复杂，指数n与x相关，且E100与1/（1+x）在较高的应变水平下偏离线性。
关键词：装配式建筑；密封胶；非线性粘弹特性；预应变；应力松弛
中图分类号：TU57+8 文献标识码：A 文章编号：1001-702X（2022）07-0063-04
Influence of pre-strain on viscoelasticity of the sealant for prefabricated buildings
ZHU Wenkai，XU Yang，REN Binbin
（Shanghai Jianke Technical Assessment of Construction Co. Ltd.，Shanghai 201100，China）
Abstract：In order to study the anti-displacement deformation ability of the sealant for prefabricated buildings，the stress relaxation method was used to measure the apparent elastic modulus of the sealant as a function of time，and the nonlinear viscosity of the elastic sealant under different prestrain m and different strain levels x was analyzed. The results show that when x<m，the elastic modulus of the sealant has a power function relationship with time. The power exponent n has nothing to do with the change of x；for the same m， the elastic modulus E100 when the stress relaxes for 100 s is related to 1/（1+x） is linear and the slopes of the curves are similar for different values of m. When x>m，the deformation behavior of the sealant is more complex，the power exponent n is related to x，and E100 and 1/（1+x） deviate from linearity at higher strain levels.
Key words：prefabricated buildings，sealants，nonlinear viscoelastic properties，pre-strain，stress relaxation