期刊
CEMENT & CONCRETE COMPOSITES
卷 49, 期 -, 页码 59-69出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2013.12.012
关键词
Interfacial bond strength; Ultra-high-performance concrete; High-strength steel fiber; Shrinkage-reducing agent; Microfiber
资金
- Bridge PLUS at the Korea Institute of Construction Technology
- Ministry of Knowledge Economy
- Human Resources Development [20124030200050]
- Korea Institute of Energy Technology Evaluation and Planning
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. (C) 2014 Elsevier Ltd. All rights reserved.
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