高延性纤维增强水泥基材料自愈合行为的试验研究
Experimental Study on Self-Healing Behavior of Engineered Cementitious Composites
董华忠 1郭丹雯 2姚超 1陈思宏 1肖云英 1吴玉斌 1王菲1
作者信息
- 1. 国网冀北电力有限公司唐山供电公司,063000
- 2. 同济大学结构防灾减灾工程系,上海 200092
- 折叠
摘要
本文介绍了不同因素对高延性纤维增强水泥基材料(Engineered Cementitious Composites,ECC)的自愈合效果的影响.基于不同的增强纤维制备ECC材料,通过拉伸试验对试件施加不同的损伤水平(初应变),然后采用不同的养护方式进行养护,最后通过拉伸试验比较愈合前后材料开裂荷载、拉伸模量和极限抗拉强度的变化.试验结果表明,养护后的预损伤试件的抗拉强度和拉伸应变能力恢复较明显,拉伸模量得到部分恢复;预损程度、纤维品种、养护条件对试件的裂后恢复有显著影响.
Abstract
This paper presents an experimental study on the self-healing effect of Engineered Cementitious Composites(ECC)under various conditions.First,specimens were fabricated using two different categories of fibers,and subjected to uni-axial tensile loading to reach different levels of pre-damages(non-linear strain).Then the specimens were treated in different curing conditions for self-healing.Finally,a series of tensile tests were conducted on the self-healed specimens to evaluate changes in peak tensile strength,tensile strain capacity,tensile modulus and etc.The test results shows the damaged ECCs after healing treatment restored their tensile strength,tensile strain capacity to a certain degree and partial tensile modulus.The damage level,fiber category and curing condition have significant effects on the mechanical properties of ECC after healing.
关键词
高延性纤维增强复合材料/混凝土/自愈合/拉伸强度/拉伸应变能力Key words
Engineered Cementitious Composites/concrete/self-healing/tensile strength/tensile strain capacity引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据