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Eco-Efficient Fiber-Reinforced Preplaced Recycled Aggregate Concrete under Impact Loading

1
Department of Civil and Environmental Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada
2
Department of Civil Engineering, Military Technical College, 37JW+5G Cairo, Egypt
*
Author to whom correspondence should be addressed.
Infrastructures 2019, 4(2), 37; https://doi.org/10.3390/infrastructures4020037
Received: 25 May 2019 / Revised: 14 June 2019 / Accepted: 19 June 2019 / Published: 21 June 2019
(This article belongs to the Special Issue Durability and Sustainability of Concrete Mixtures)
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Abstract

This study explores highly eco-efficient preplaced aggregate concrete mixtures having superior tensile characteristics and impact resistance developed for pavement and infrastructure applications. A fully recycled granular skeleton consisting of recycled concrete aggregate and recycled tire rubber granules, and steel wire fibers from scrap tires are first placed in the formwork, then injected with a flowable grout. Considering its very high recycled content and limited mixing and placement energy (only the grout is mixed, and no mechanical vibration is needed), this material has exceptional sustainability features and offers superior time and cost savings. Moreover, typical problems of rapid loss of workability due to the high-water absorption of recycled aggregates and the floating of lightweight tire rubber granules are prevented since the aggregates are preplaced in the formwork. The much higher granular content and its denser skeleton reduce the cementitious dosage substantially and provide high volume stability against shrinkage and thermal strains. The behavior under impact loading of this sustainable preplaced recycled aggregate concrete, incorporating randomly dispersed steel wire fibers retrieved from scrap tires, was investigated using a drop weight impact test. The results show that recycled tire steel wire fibers significantly enhanced the tensile and impact properties. A two-parameter Weibull distribution provided an accurate prediction of the impact failure strength of the preplaced recycled aggregate concrete mixtures, allowing to avert additional costly laboratory experiments. View Full-Text
Keywords: recycled aggregate; preplaced aggregate; tire rubber; steel wire; Weibull distribution recycled aggregate; preplaced aggregate; tire rubber; steel wire; Weibull distribution
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Alfayez, S.; Ali, M.A.E.M.; Nehdi, M.L. Eco-Efficient Fiber-Reinforced Preplaced Recycled Aggregate Concrete under Impact Loading. Infrastructures 2019, 4, 37.

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