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Effects of geometry and hybrid ratio of steel and polyethylene fibers on the mechanical performance of ultra-high-performance fiber-reinforced cementitious composites

Authors
Kim, Min-JaeYoo, Doo-YeolYoon, Young-Soo
Issue Date
4월-2019
Publisher
ELSEVIER SCIENCE BV
Keywords
UHPFRCC; Steel fiber; Polyethylene fiber; Fiber hybridization; Mechanical performance; Synergy effect
Citation
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, v.8, no.2, pp.1835 - 1848
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume
8
Number
2
Start Page
1835
End Page
1848
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/66549
DOI
10.1016/j.jmrt.2019.01.001
ISSN
2238-7854
Abstract
This study aims to examine the several factors influencing the efficiency of the hybridization of steel and polyethylene (PE) fibers in improving the compressive strength and tensile performance of ultra-high-performance fiber-reinforced cementitious composites (UHPFRCC). For the mechanical tests, three types of steel fibers (i.e., short straight steel (SS), medium-length straight steel (MS), and twisted steel (T) fibers) and four lengths of polyethylene (PE) fibers (i.e., 12 mm (SPE), 18 mm (MPE), 27 mm (LPE), and 36 mm (LLPE)) were hybridized. Each specimen included 2 vol.% of single or hybrid fibers, and the hybrid ratio was controlled by replacing 0.5% of the steel fibers with the same amount of PE fibers from 0 to 2%. Thus, a total of 7 single and 36 hybrid UHPFRCC specimens were fabricated. From the test results, it was found that the compressive strength decreased proportionally to the PE fiber content, but the decrease was more severe in hybrid specimens, including 1.5% PE fibers, than single fiber specimens, including 2.0% PE fibers. The tensile strength also decreased with an increase of PE fiber content, whereas strain capacity and energy absorption capacity per unit volume substantially improved with the inclusion of PE fibers. The SPE fibers showed the best hybridizing efficiency among PE fibers in improving the tensile strain capacity and energy absorption capacity of UHPFRCC, and the use of T fibers was the most effective in terms of cracking behavior. (C) 2019 The Authors. Published by Elsevier B.V.
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공과대학 (건축사회환경공학부)
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