| 摘要: |
| 为研究形状记忆合金（SMA）/聚乙烯醇（PVA）混杂纤维增强水泥基复合材料（SMA/PVA-ECC）的拉伸性能，开展单轴拉伸试验，分析了SMA/PVA-ECC试件的破坏现象、应力-应变曲线及特征参数，比较了SMA纤维掺量及其直径对试件拉伸性能的影响.结果表明：SMA/PVA-ECC试件卸载后残余裂缝宽度显著减小；SMA纤维掺量及其直径对试件拉伸性能影响显著，当SMA纤维直径为0.2 mm、掺量为0.2%时，试件综合拉伸性能最好，其初裂强度、极限拉伸应力及应变较工程水泥基复合材料（ECC）试件分别提高56.4%、23.6%及13.4%. |
| 关键词: SMA/PVA混杂纤维增强水泥基复合材料 超弹性 拉伸性能 自复位 |
| DOI：10.3969/j.issn.1007-9629.2023.05.014 |
| 分类号:TU352.11 |
| 基金项目:国家自然科学基金资助项目（52178158）；湖北省自然科学基金资助项目（2019CFB540）；国家级大学生创新创业训练计划项目（202110488009）；湖北省教育厅高等学校优秀中青年科技创新团队计划项目（Zy2022e004） |
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| Tensile Properties of SMA/PVA Hybrid Fiber Reinforced Cementitious Composites |
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YANG Zhao1,2, ZHONG Yilan1, YANG Zhi3, XIONG Hao1
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1.School of Urban Construction， Wuhan University of Science and Technology， Wuhan 430065， China;2.Hubei Engineering Research Center for Urban Renewal， Wuhan University of Science and Technology， Wuhan 430065， China;3.China Construction Yipin Investment Development Co.， Ltd.， Wuhan 430070， China
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| Abstract: |
| In order to study the tensile properties of shape memory alloy/polyvinyl alcohol-engineening cement-based composite materials（SMA/PVA-ECC）， uniaxial tensile test were carried out，and the damage phenomena， stress-strain curves and characteristic parameters of the SMA/PVA-ECC specimens were analyzed， and the effects of SMA fibers content and diameter were compared. The results show that the residual crack widths of SMA/PVA-ECC specimens are significantly reduced after unloading. The content and diameter of SMA fiber have significant effects on the tensile properties of the specimens. Compared with the engineering cement-based composite materials（ECC） specimens， the comprehensive tensile properties of the specimens with 0.2 mm fiber diameter and 0.2% fiber content are the best， and the initial cracking strength， ultimate tensile stress and ultimate tensile strain are increased by 56.4%， 23.6% and 13.4%， respectively. |
| Key words: SMA/PVA-ECC superelasticity tensile property self-centering |
