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Computers and Concrete Volume 20, Number 4, October 2017 , pages 491-502 DOI: https://doi.org/10.12989/cac.2017.20.4.491 |
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Estimating properties of reactive powder concrete containing hybrid fibers using UPV |
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Mahdi Nematzadeh and Reza Poorhosein
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| Abstract | ||
| In this research, the application of ultrasonic pulse velocity (UPV) test as a nondestructive method for estimating some of the mechanical and dynamic properties of reactive powder concrete (RPC) containing steel and polyvinyl alcohol (PVA) fibers, as well as their combination was explored. In doing so, ten different mix designs were prepared in 19 experimental groups of specimens containing three different volume contents of steel fibers (i.e., 1, 2, and 3%) and PVA fibers (i.e., 0.25, 0.5, and 0.75%), as well as hybrid fibers (i.e., 0.25-0.75, 0.5-0.5, and 0.75-0.25%). The specimens in these groups were prepared under the two curing regimes of normal and heat treatment. Moreover, the UPV test results were employed to estimate the compressive strength, dynamic modulus, shear modulus, and Poisson\'s ratio of the RPC concrete and to investigate the quality level of the used concrete. At the end, the effect of the specimen shape and in fact the measuring distance length on the UPV results was explored. The results of this research suggest that the steel fiber-containing RPC specimens demonstrate the highest level of ultrasonic pulse velocity as well as the highest values of the mechanical and dynamic properties. Moreover, heat treatment has a positive effect on the density, UPV, dynamic modulus, Poisson\'s ratio, and compressive strength of the RPC specimens, whereas it leads to a negligible increase or decrease in the shear modulus and static modulus of elasticity. Furthermore, the specimen shape affects the UPV of fiber-lacking specimens while negligibly affecting that of fiber-reinforced specimens. | ||
| Key Words | ||
| reactive powder concrete; nondestructive test; ultrasonic pulse velocity; compressive strength; dynamic modulus; hybrid fibers; heat treatment | ||
| Address | ||
| Mahdi Nematzadeh and Reza Poorhosein: Department of Civil Engineering, University of Mazandaran, 47416-13534, Babolsar, Iran | ||