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Experimental evaluation of the potential use of waste recycled concrete fine aggregates to produce self-compacting concrete

2023-09-27Journal article Open access
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dc.contributor.authorPinto, Hugo
dc.contributor.authorNepomuceno, Miguel
dc.contributor.authorBernardo, Luís
dc.contributor.authorOliveira, Luiz Pereira de
dc.date.accessioned2023-10-02T11:12:33Z
dc.date.available2023-10-02T11:12:33Z
dc.date.issued2023-09-27
dc.description.abstractThe current concern with sustainability in the construction sector has led to the adoption of processes to minimise the impact on the environment. The use of recycled concrete aggregates in self-compacting concrete (SCC), as an alternative to natural aggregates, seems to be a solution with great potential. However, it is common knowledge that the use of recycled aggregates in the production of SCC instead of natural aggregates may causes changes in some of its properties, both in the fresh and hardened state, and that the magnitude of those changes will depend on the percentages of incorporation and the nature of recycled aggregates. When using the mix design methodology proposed by Nepomuceno et al, SCC is assumed to be consisted basically of two phases, namely, the liquid phase (mortar phase) and the solid phase (coarse aggregates), being the main SCC properties controlled by the mortar phase. In this perspective, this research work reports the results obtained when testing mortars with flow properties appropriate to produce SCC, when binary and ternary blends of powder materials were used and natural fine aggregates were partially replaced by recycled concrete fine aggregates. The experimental program carried out involved, in a first stage, the production and testing of 11 binary mortar mixtures suitable for the production of SCC, with replacement percentages of natural fine aggregate by recycled concrete fine aggregate varying from 0% (reference mixture) to 50%, in 5% increments. Subsequently, 6 ternary mortar mixtures were produced and tested for the same purpose, with replacement percentages of natural fine aggregate by recycled concrete fine aggregate varying from 0% (reference mixture) to 50%, in 10% increments. Binary mortars included Portland cement type I 42.5R and limestone powder, while ternary mortars included Portland cement type I 42.5R, limestone powder and fly ash. In both cases, the dosages of superplasticizer and mixing water were determined experimentally to obtain the required fresh properties suitable to produce SCC. The results indicate that the 28 days age compressive strength and density of the mortars decrease with the increase in the percentage of incorporation of recycled concrete fine aggregates, regardless of whether they are mortars with binary or ternary blends of powders. In binary mixtures, the mixing water dosage increases with the percentage of incorporation of recycled aggregates, while in ternary mixtures the opposite occurs, at least up to a percentage of 40% of incorporation of recycled aggregates. The superplasticizer dosages, necessary to obtain the appropriate flow properties, were always higher in the ternary mixtures compared to the binary mixtures, even comparing only the reference mixtures. It can be concluded that mortars with the incorporation of recycled concrete fine aggregates constitute a viable material with potential for use in the construction industry, provided that the necessary adjustments to its performance are considered, thus contributing to the sustainability of construction.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationHugo A. S. Pinto, Miguel C. S. Nepomuceno, Luís F. A. Bernardo, and Luiz A. P. Oliveira. Experimental evaluation of the potential use of waste recycled concrete fine aggregates to produce self-compacting concrete, AIP Conference Proceedings, Vol. 2928, No. 1, AIP Publishing, Sep 27 (2023). DOI: 10.1063/5.0170518.pt_PT
dc.identifier.doihttps://doi.org/10.1063/5.0170518pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.6/13424
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherAIP Publishingpt_PT
dc.relationCentre of Materials and Building Technologies
dc.subjectConstruction wastes valorisationpt_PT
dc.subjectSelf-compacting concretept_PT
dc.subjectRecycled concrete aggregatespt_PT
dc.subjectFine recycled aggregatespt_PT
dc.subjectFresh propertiespt_PT
dc.subjectMechanical propertiespt_PT
dc.subjectSustainabilitypt_PT
dc.titleExperimental evaluation of the potential use of waste recycled concrete fine aggregates to produce self-compacting concretept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCentre of Materials and Building Technologies
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04082%2F2020/PT
oaire.citation.issue1pt_PT
oaire.citation.titleAIP Conference Proceedingspt_PT
oaire.citation.volume2928pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameSILVA PINTO
person.familyNameNepomuceno
person.familyNameBernardo
person.familyNamePereira de Oliveira
person.givenNameHUGO ALEXANDRE
person.givenNameMiguel Costa Santos
person.givenNameLuís
person.givenNameLuiz Antonio
person.identifierhttp://scholar.google.pt/citations?user=IguykP4AAAAJ
person.identifier305712
person.identifier.ciencia-id7C1D-9E64-9EC4
person.identifier.ciencia-idF710-57AF-521F
person.identifier.ciencia-id031F-9022-653B
person.identifier.orcid0000-0002-1028-4655
person.identifier.orcid0000-0003-3865-490X
person.identifier.orcid0000-0003-0484-350X
person.identifier.orcid0000-0002-1353-2001
person.identifier.ridO-3212-2013
person.identifier.scopus-author-idhttp://www.scopus.com/authid/detail.url?authorId=36246411800
person.identifier.scopus-author-id8070435300
person.identifier.scopus-author-id8414567700
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublicationd93f6f35-204d-4bd1-a38a-5ec3c39a31e3
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relation.isAuthorOfPublication.latestForDiscovery9d43398c-9ed8-49ba-96ae-dd85101c6170
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