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Comparative flexural behavior of ultra-high-performance concrete reinforced with hybrid straight steel fibers

Title
Comparative flexural behavior of ultra-high-performance concrete reinforced with hybrid straight steel fibers
Author
류두열
Keywords
Ultra-high-performance concrete; Fiber hybridization; Flexure; Toughness; Fiber bridging capacity
Issue Date
2017-02
Publisher
ELSEVIER SCI LTD
Citation
CONSTRUCTION AND BUILDING MATERIALS, v. 132, page. 219-229
Abstract
This study investigates the implications of fiber hybridization on the flexural behavior of ultra-highperformance concrete (UHPC). To do this, we considered three straight steel fibers with different lengths, l(f), of 13 mm (short), 19.5 mm (medium-length), and 30 mm (long) at various volume fractions. Test results indicated that the hybrid use of long and medium-length fibers effectively improved the flexural performance in terms of post-cracking strength, deflection capacity, toughness, and cracking behavior, whereas the hybrid use of long and short fibers generally decreased the performance. To verify this observation, a micromechanical analysis was performed for obtaining the fiber bridging curve, which most significantly influences the post-cracking properties. The hybrid use of long and short (or medium-length) fibers provided negative synergy values in toughness due to several detrimental effects. The complementary energy in the fiber bridging curve increased with an increase in the fiber length, so that an increase in the proportion of short (or medium-length) fiber clearly decreased the complementary energy. Based on a proposed equation for the relationship between the normalized modulus of rupture and the fiber reinforcing index, we found that it is possible to produce deflection-hardening behavior of UHPC with straight steel fibers when the fiber reinforcing index is higher than 0.5. (C) 2016 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/abs/pii/S0950061816318736?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/112942
ISSN
0950-0618; 1879-0526
DOI
10.1016/j.conbuildmat.2016.11.104
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ARCHITECTURAL ENGINEERING(건축공학부) > Articles
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