High strain rate effects on direct tensile behavior of high performance fiber reinforced cementitious composites

被引:91
作者
Tran, Tuan Kiet [1 ]
Kim, Dong Joo [1 ]
机构
[1] Sejong Univ, Dept Civil & Environm Engn, Seoul 143747, South Korea
基金
新加坡国家研究基金会;
关键词
Strain energy impact test system; High strain rates; High performance fiber reinforced cementitious composites; Dynamic increase factor; Strain rate effect; CONCRETE;
D O I
10.1016/j.cemconcomp.2013.10.005
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Direct tensile behavior of high performance fiber reinforced cementitious composites (HPFRCCs) at high strain rates between 10 s(-1) and 30 s(-1) was investigated using strain energy frame impact machine (SEFIM) built by authors. Six series of HPFRCC combining three variables including two types of fiber, hooked (H) and twisted (T) steel fiber, two fiber volume contents, 1% and 1.5%, and two matrix strengths, 56 MPa and 81 MPa, were investigated. The influence of these, three variables on the high strain rate effects on the direct tensile behavior of HPFRCCs was analyzed based on the test results. All series of HPFRCCs showed strongly sensitive tensile behavior at high strain rates, i.e., much higher post cracking strength, strain capacity, and energy absorption capacity at high strain rates than at static rate. However, the enhancement was different according to the types of fiber, fiber volume content and matrix strength: HPFRCCs with T-fibers produced higher impact resistance than those with H-fibers; and matrix strength was more influential, than fiber contents, for the high strain rate sensitivity. In addition, an attempt to predict the dynamic increase factor (DIF) of post cracking strength for HPFRCCs considering the influences of fiber type and matrix strength was made. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:186 / 200
页数:15
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