Effect of shrinkage reducing agent on pullout resistance of high-strength steel fibers embedded in ultra-high-performance concrete |
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| Affiliation: | 1. Department of Civil and Environmental Engineering, Sejong University, 98 Gunja-Dong, Gwangjin-Gu, Seoul 143-747, Republic of Korea;2. Korea Institute of Construction Technology, 2311 Daewha-Dong, Ilsan-Gu, Goyang-Si, Gyeonggi-Do 411-712, Republic of Korea;1. Department of Civil Eng., Gaziantep University, Gaziantep, Turkey;2. Department of Civil Eng., Harran University, ?anl?urfa, Turkey;3. Department of Civil Eng., Hasan Kalyoncu University, Gaziantep, Turkey;1. Center for Infrastructure Engineering Studies, Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO, USA;2. Walker Consultants, Seattle, WA, USA;1. Zachry Department of Civil Engineering, Texas A&M University, CE/TTI Bldg. 503-G, 3136 TAMU, College Station, TX 77843-3136, USA;2. Department of Civil & Environmental Engineering, University of Michigan, 2350 Hayward, GG Brown Bldg., Ann Arbor, MI 48109-2125, USA;1. Department of Civil Engineering, The University of British Columbia, 6250 Applied Science Lane, Vancouver, BC V6T 1Z4, Canada;2. School of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Republic of Korea |
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| Abstract: | The interfacial bond strength of long high-strength steel fibers embedded in ultra-high-performance concrete (UHPC) reinforced with short steel microfibers was investigated by conducting single-fiber pullout tests. In particular, the influence of the addition of a shrinkage-reducing to a UHPC matrix on the pullout resistance of high-strength steel fibers was investigated. The addition of a shrinkage-reducing agent produced a noticeable reduction in the fiber pullout resistance owing to the lower matrix shrinkage, although the reduction of pullout resistance differed according to the type of fiber. Long smooth and twisted steel fibers were highly sensitive to the addition of the shrinkage-reducing agent whereas hooked fibers were not. Among the various high-strength steel fibers tested, twisted steel macrofibers showed the highest interfacial bond resistance, although twisted fibers embedded in UHPC showed slip softening pullout behavior rather than the typical slip hardening behavior observed in mortar. |
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| Keywords: | Interfacial bond strength Ultra-high-performance concrete High-strength steel fiber Shrinkage-reducing agent Microfiber |
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