建筑外墙腻子动态抗开裂性的表征方法  

Characterization Method of Dynamic Cracking Resistance of Putty for Exterior Building Walls

作　　者：杨兵 孙颖暄 王连盛 梁杨 陈宝雨 赵志成 Yang Bing;Sun Yingxuan;Wang Liansheng;Liang Yang;Chen Baoyu;Zhao Zhicheng(CABR Testing Center Co.,Ltd.,Beijing 100000,China;China Academy of Building Research Co.,Ltd.,Beijing 100000,China)

机构地区：[1]建研院检测中心有限公司,北京100000 [2]中国建筑科学研究院有限公司,北京100000

出　　处：《涂料工业》2022年第12期53-56,62,共5页Paint & Coatings Industry

基　　金：中国建筑科学研究院青年基金项目(20210112331030023)。

摘　　要：通过对批刮2 mm厚腻子的预制裂纹无石棉纤维水泥平板施加应力,模拟墙面微裂纹的动态发展过程中腻子膜对基层微裂纹的覆盖能力,根据应力-应变曲线中峰值点对应的最大载荷、行程、位移和曲线面积来表征腻子膜的动态抗开裂性。结果表明:各类型建筑外墙腻子在峰值点对应的最大载荷、行程、位移具有明显的区分度,应力-应变曲线面积也具有明显差异,可实现对腻子膜柔韧性较为精确的定量评价,弥补了现行标准中动态抗开裂方法测定腻子膜柔韧性的不足。该方法有望对标准的修订有一定的参考作用。In this paper,by applying stress to the pre-cracked non-asbestos fiber cement slabs with 2 mm thick putty,the ability of the putty film to cover micro-cracks in the base layer during the dynamic development of wall micro-cracks is simulated.The dynamic cracking resistance of the putty film was characterized according to the maximum load,stroke and displacement corresponding to the peak,and the curve area of the stress-strain curve.The results showed that the maximum load,stroke and displacement corresponding to the peak of various building exterior wall putty had obvious discrimination,and the area of stress-strain curve was also significantly different,and a more accurate quantitative evaluation of the putty film flexibility could be achieved,which made up the deficiency of the dynamic anti-cracking method in the current standard.It was hopeful to provide a reference for future revisions of the standard.

关 键 词：建筑外墙 腻子 动态抗开裂 峰值点 最大载荷 行程 位移 柔韧性 

分 类 号：TQ638[化学工程—精细化工]