混杂纤维延性水泥基材料单轴受压力学特性  

Mechanical Properties of Hybrid Fiber Reinforced Engineered Cementitious Composites under Uniaxial Compression

作　　者：王振波 左建平[1] 张君[2,3] 冯路路[1] 姜广辉 WANG Zhenbo;ZUO Jianping;ZHANG Jun;FENG Lulu;JIANG Guanghui(School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory of Structural Safety and Durability of China Education Ministry,Tsinghua University,Beijing 100084,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]清华大学土木工程系,北京100084 [3]清华大学结构安全与耐久教育部重点实验室,北京100084

出　　处：《建筑材料学报》2018年第4期639-644,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51278278;51622404);北京市自然科学基金资助项目(8184083);中央高校基本科研业务费项目(2017QL01);中国矿业大学(北京)越崎杰出学者奖励计划项目

摘　　要：针对纤维增强延性水泥基材料(ECC)在高强度等级下的抗压韧性退化问题,在传统ECC体系中附加微细钢纤维,制备混杂聚乙烯醇(PVA)-钢纤维增强延性水泥基材料.通过圆柱体抗压试验研究混杂纤维延性水泥基材料的单轴受压力学特性.结果表明:随着钢纤维掺量的增加,材料受压应力-应变曲线的上升段斜率呈增大趋势,而曲线下降段逐渐平缓,残余应力水平显著提升;混杂纤维延性水泥基材料的单轴抗压强度、弹性模量和峰值应变随钢纤维掺量增加小幅提升,而材料抗压韧性指标的提升效果较为显著;PVA纤维与钢纤维混杂在改善ECC抗压韧性方面具有独特优势,实现了高强ECC的抗压韧性.In order to improve the compressive toughness of engineered cementitious composites(ECC)with high strength,hybrid polyvinyl alcohol(PVA)-steel fiber reinforced ECC were developed by incorporating additional steel micro-fibers into traditional ECC.Cylinder specimens were tested under uniaxial compression to investigate the mechanical properties of hybrid fiber reinforced ECC.Test results show that the ascending slope of stress-strain curves is increased with the increasing addition of steel fibers,while the descending portion is gradually improved and leads to higher residual stress.The uniaxial compressive strength,elastic modulus and peak strain of hybrid fiber reinforced ECC are slightly increased respectively with the increasing additional steel fibers,while a significant improvement is achieved for compressive toughness.Hybrid PVA-steel fiber system exhibits advantages over mono fiber system.ECC with both high strength and high compressive toughness are obtained.

关 键 词：混杂纤维 单轴受压 应力应变曲线 韧性 泊松比 

分 类 号：TU528.01[建筑科学—建筑技术科学]