Direct tensile behavior of ultra high performance fiber reinforced concrete (UHP-FRC) at high strain rates |
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| Affiliation: | 1. New Transportation Systems Research Center, Korea Railroad Research Institute, 176 Railroad Museum Road, Uiwang-si, Gyeonggi-do 16105, South Korea;2. Department of Civil & Environmental Engineering, University of Michigan, 2350 Hayward, G.G. Brown, Ann Arbor, MI 48109–2125, USA;1. Institute of Bridge Engineering, Department of Civil, Structural, and Environmental Engineering, State University of New York at Buffalo, 135 Ketter Hall, Buffalo, NY 14260, USA;2. Department of Civil and Environmental Engineering, University of Michigan Ann Arbor, 2350 Hayward St, Ann Arbor, MI 48109, USA;3. US Army Engineer Research and Development Center (ERDC), 3909 Halls Ferry Rd, Bldg 5028, Vicksburg, MS 39180, USA;1. Department of Civil Engineering, ROC Military Academy, 1 No. Weiwu Rd., Kaohsiung 83059, Taiwan, ROC;2. Department of Civil & Environmental Engineering, University of Michigan, 2374 G.G. Brown, Ann Arbor, MI 48109-2125, USA |
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| Abstract: | 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. |
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