期刊文献+

聚乙烯纤维制备超高延性水泥基复合材料的试验研究 预览

Experimental Study on Mechanical Properties of Ultra-High Ductile Cementitious Composites
在线阅读 免费下载
收藏 分享 导出
摘要 为进一步提升高性能水泥基复合材料的拉伸能力,研制了以短切超高分子量聚乙烯纤维作为增强材料,以水泥砂浆为基体的超高延性水泥基复合材料(Ultra-high ductility cementitious composites,UHDCC)。本研究通过直接拉伸、单轴抗压及三点弯曲梁试验研究了UHDCC的基本力学性能。直拉试验表明,UHDCC具有优异的应变硬化和多重裂缝开裂性能。在极限状态下,UHDCC的裂纹间距小于2 mm,最大平均裂纹宽度小于200μm;材料的平均抗拉强度为7.28 MPa,峰值强度处的平均拉伸应变达到12%,最大拉伸应变达到13%以上,具有超高的拉伸延性。轴压试验表明,超过峰值强度后,UHDCC在80%和60%的抗压峰值强度处的应变分别约为2.8%和7.0%,说明材料具有强大的受压变形能力。材料的弯曲韧性指数I 10、I 30、I 50、I 60分别为10.1、33.1、54.4、65.6,表明UHDCC具有优异的弯曲变形能力。此外,三点弯曲缺口梁和单裂缝试验结果表明,UHDCC的超高延性源于聚乙烯纤维超高的裂缝桥接能力。 To further enhance the tensile capacity of high performance cementitious composites,a new kind of cementitious material ultra-high ductility cementitious composites(UHDCC)based on cement mortar,is developed with the help of ultra high molecular weight polyethylene(PE)fibers.Uniaxial tension test,compression test and three-point bending beam test were conducted to explore the basic mechanical properties of UHDCC in this paper.The uniaxial tension test results indicated that UHDCC exhibited outstanding strain hardening behavior and the multiple cracking pattern.At the ultimate state,the crack spacing of UHDCC was generally less than 2 mm with the crack widths less than 200μm.The average tensile strength of UHDCC was 7.28 MPa,while the average tensile strain capacity reached 12%(the maximal one more than 13%).The compressive test results showed that the compressive strains corresponding to the 80%and 60%of the peak compressive strength in post-peak branch reached about 2.8%and 7.0%,exhibiting the superior compressive ductility.The flexural toughness index I 10,I 30,I 50 and I 60 of UHDCC were 10.1,33.1,54.4 and 65.6 respectively,indicating the ultra-high deformability of UHDCC.Moreover,the 3-point bending notched beam test and single crack tension test results demonstrated that the high ductility of UHDCC originates from the ultra-high crack bridging capacity.
作者 王义超 侯梦君 余江滔 徐世烺 俞可权 张志刚 WANG Yichao;HOU Mengjun;YU Jiangtao;XU Shilang;YU Kequan;ZHANG Zhigang(College of Civil Engineering,Tongji University,Shanghai 200092;Shanghai Key Laboratory of Engineering Structure Safety,Shanghai 200032;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058;School of Civil Engineering,Chongqing University,Chongqing 400044)
出处 《材料导报》 CSCD 北大核心 2018年第20期3535-3540,共6页 Materials Review
基金 国家自然科学基金(51478362)。
关键词 纤维混凝土 拉伸性能 弯曲韧性 应变硬化 超高延性水泥基复合材料 fiber reinforced concrete tensile capacity flexural toughness strain hardening ultra-high ductility cementitious composites
作者简介 王义超:男,1989年生,博士研究生,主要研究方向为超高延性水泥基复合材料 E-mail:wangyichao@tongji.edu.cn;余江滔:通信作者,男,1975年生,博士,副教授,博士研究生导师,主要研究方向为高性能纤维混凝土 E-mail:yujiangtao@tongji.edu.cn。
  • 相关文献

参考文献3

二级参考文献87

共引文献183

投稿分析

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部 意见反馈