Extended application of the Equivalent Mortar Volume mix design method for recycled aggregate concrete

Research output: Contribution to conferencePaper

Abstract

This paper presents the study carried out using the extended Equivalent Mortar Volume (EMV) mix design technique, for concrete made of recycled aggregates (RA) and steel fibre (SF). The expansion of the EMV approach is necessary to encourage the use of fine recycled aggregates (FRA) in concrete manufacture. To this end, the same replacement ratio obtained for coarse recycled aggregates (CRA) using the EMV principles, was applied to the FRA for concrete production. Furthermore, SF was added to improve the mechanical behaviour of RA-concrete developed with this method. Altogether, four mixes were developed using a constant waterto-cement ratio of 0.42 thus: reference mix labelled conventional concrete (CC) prepared with natural aggregates (NA); crushed aggregate concrete (CAC) mix designed with the conventional method and made of 100% RA; blended aggregate concrete (BAC) mix prepared with the EMV guide and composed of both NA and RA; and steel fibre-reinforced blended aggregate concrete (SFRBAC) mix prepared by adding optimum SF to the BAC mix. Then, cubical, cylindrical and prismatic specimens were produced from the mixes to investigate different properties of concrete. The experimental results show that the mechanical properties of concrete are not adversely affected by the presence of FRA. Also, the EMV mix design provision offers a better result than its companion conventional approach, even with about 30% reduction in cement content. The addition of SF mainly controlled crack development and induced a ductile failure mode.
Original languageEnglish
Pages1-7
Number of pages7
DOIs
Publication statusPublished - 19 Oct 2020
Event5th World Congress on Civil, Structural, and Environmental Engineering (CSEE'20) - Online (Virtual)
Duration: 19 Oct 202020 Oct 2020
Conference number: 20

Conference

Conference5th World Congress on Civil, Structural, and Environmental Engineering (CSEE'20)
Abbreviated titleCSEE'20
Period19/10/2020/10/20

Keywords

  • Fine recycled aggregates
  • Steel fibre
  • Mix design
  • Equivalent mortar volume
  • Crack development

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