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Computers and Concrete Volume 21, Number 2, February 2018 , pages 167-179 DOI: https://doi.org/10.12989/cac.2018.21.2.167 |
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Mechanical behavior of hybrid steel-PVA fibers reinforced reactive powder concrete |
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Reza Poorhosein and Mahdi Nematzadeh
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| Abstract | ||
| Reactive powder concrete (RPC) is a type of ultra-high strength cement-based material with a dense microstructure, which is made of ultra-fine powders. RPC demonstrate a very brittle behavior, thus adding fibers improves its mechanical properties. In this study, it was attempted to investigate the effect of using steel and polyvinyl alcohol (PVA) fibers as well as their combination on the properties of RPC. In this regard, hooked-end crimped steel fibers together with short PVA fibers were utilized. Steel and PVA fibers were used with the maximum volume fraction of 3% and 0.75%, respectively, and also different combinations of these fibers were used with the maximum volume fraction of 1% in the concrete mixes. In total, 107 concrete specimens were prepared, and the effect of fiber type and volume fraction on the physico-mechanical properties of RPC including compressive strength, tensile strength, modulus of elasticity, density, and failure mode was explored. In addition, the effect of the curing type on the properties of compressive strength, modulus of elasticity, and density of RPC was evaluated. Finally, coefficients for conversion of cubic compressive strength to cylindrical one for the RPC specimens were obtained under the two curing regimes of heat treatment and standard water curing. | ||
| Key Words | ||
| reactive powder concrete; physico-mechanical properties; hybrid fibers; heat treatment; failure mode | ||
| Address | ||
| Reza Poorhosein and Mahdi Nematzadeh: Department of Civil Engineering, University of Mazandaran, Babolsar, Iran | ||