Effect of mix design methods on the mechanical properties of steel fibre-reinforced concrete prepared with recycled aggregates from precast waste

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Abstract

This research investigates the impact of mix design methods on the mechanical characteristics of steel fibre-reinforced concrete (SFRC) made with recycled aggregates (RA) obtained from a precast waste concrete. The experimental campaign was carried out in two phases. In phase I, three types of steel fibre (SF) differing only in shape were examined. Then, eight mixes were formulated, considering a range of SF volume ratios from 0.125% to 1.5%, using both normal and the Equivalent Mortar Volume (EMV) mix design methods. In phase II, a reference mix and two recycled aggregate concrete mixes were developed, one designed with normal method and the other with the EMV technique and incorporating their associated optimum SF content obtained in phase I. The results show that the mechanical properties of SFRC proportioned with the EMV approach is not adversely affected and that water absorption capacity of the concrete is improved with this method compared to the traditional method. Also, mix design method adopted for recycled concrete affects the optimum SF volume ratio.
Original languageEnglish
Article numberSTRUCTURES-D-19-00876R1
Pages (from-to)664-672
Number of pages9
JournalStructures
Volume27
Early online date1 Jul 2020
DOIs
Publication statusPublished - Oct 2020

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Structures. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Structures, 27 (2020)] DOI: 10.1016/j.istruc.2020.05.038

© 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • Recycled aggregate concrete
  • Steel fibre
  • Mix design
  • Precast waste
  • Optimization
  • Equivalent Mortar Volume
  • Compressive strength

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