Direct tensile behavior of ultra high performance fiber reinforced concrete (UHP-FRC) at high strain rates

被引：119
作者：
Pyo, Sukhoon [1 ]
El-Tawil, Sherif [2 ]
Naaman, Antoine E. [2 ]
机构：
[1] Korea Railrd Res Inst, New Transportat Syst Res Ctr, 176 Railrd Museum Rd, Uiwang Si 16105, Gyeonggi Do, South Korea
[2] Univ Michigan, Dept Civil & Environm Engn, 2350 Hayward, Ann Arbor, MI 48109 USA
来源：
CEMENT AND CONCRETE RESEARCH | 2016年 / 88卷
基金：
美国国家科学基金会;
关键词：
Mechanical properties; Strain effect; Tensile properties; Fiber reinforcement; High-performance concrete; CEMENTITIOUS COMPOSITES; IMPACT; BAR; COMPRESSION;
D O I：
10.1016/j.cemconres.2016.07.003
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This experimental study investigates the direct tensile behavior of ultra-high performance fiber reinforced concrete (UHP-FRC) at strain rates ranging from 90 to 146/s. The tests are conducted using a recently developed impact testing system that uses suddenly released strain energy to generate an impact pulse. Three fiber types were considered, a twisted fiber and two other types of straight fibers. Specimen impact response was evaluated in terms of first cracking strength, post-cracking strength, energy absorption capacity and strain capacity. The test results indicate that specimens with twisted fibers generally exhibit somewhat better mechanical properties than specimens with straight fibers for the range of strain rates considered. All UHP-FRC series tested showed exceptional rate sensitivities in energy absorption capacity, generally becoming much more energy dissipative under increasing strain rates. This characteristic highlights the potential of UHP-FRC as a promising cement based material for impact- and blast-resistant applications. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：144 / 156
页数：13
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