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Study of ASR in concrete with recycled aggregates: Influence of aggregate reactivity potential and cement type

2020-12-30Journal article Open access
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datacite.subject.fosEngenharia e Tecnologia::Engenharia Civil
datacite.subject.fosCiências Naturais::Outras Ciências Naturais
dc.contributor.authorSantos, Miguel Barreto
dc.contributor.authorBrito, Jorge de
dc.contributor.authorSilva, António Santos
dc.contributor.authorAhmed, Hawreen Hasan
dc.date.accessioned2025-07-16T15:53:42Z
dc.date.available2025-07-16T15:53:42Z
dc.date.issued2020-12-30
dc.descriptionArticle number - 120743
dc.description.abstractThe incorporation of recycled aggregate (RA) in structural concrete requires deep knowledge of this material's potential and limitations by assessing its effect on the concrete properties. Alkali-silica reaction (ASR) is one of the most concerning degradation agents in concrete produced with natural aggregates, and more expectedly in recycled aggregate concrete (RAC), which motivated this study. ASR was analysed through expansion evolution in concrete mixes produced with different replacement levels of coarse natural aggregates (CNA) with reactive and non-reactive coarse recycled aggregates (CRA). In addition, concrete mixes were naturally and artificially aged to simulate the reaction at different ages. The influence of cement type on ASR development in RAC was also evaluated. The results showed that the incorporation of 20% of reactive RA did not affect concrete's expansion behaviour. The highest expansions were obtained when 100% of reactive RA and a higher strength class cement were used.eng
dc.description.sponsorshipThe authors gratefully acknowledge the support of CERIS (Civil Engineering Research and Innovation for Sustainability), FCT (Foundation for Science and Technology), and LNEC (National Laboratory for Civil Engineering) for their support through the project RE-IMPROVE (Expansive reactions in concrete - Prevention and mitigation of their effects).
dc.identifier.citationMiguel Barreto Santos, Jorge de Brito, António Santos Silva, Hawreen Hasan Ahmed, Study of ASR in concrete with recycled aggregates: Influence of aggregate reactivity potential and cement type, Construction and Building Materials, Volume 265, 2020, 120743, ISSN 0950-0618, https://doi.org/10.1016/j.conbuildmat.2020.120743.
dc.identifier.doi10.1016/j.conbuildmat.2020.120743
dc.identifier.issn0950-0618
dc.identifier.urihttp://hdl.handle.net/10400.8/13675
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relation.hasversionhttps://www.sciencedirect.com/science/article/pii/S0950061820327483?via%3Dihub
dc.relation.ispartofConstruction and Building Materials
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectRecycled aggregates
dc.subjectAlkali-silica reaction
dc.subjectDurability
dc.subjectConcrete
dc.subjectDegradation
dc.titleStudy of ASR in concrete with recycled aggregates: Influence of aggregate reactivity potential and cement typeeng
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage11
oaire.citation.startPage1
oaire.citation.titleConstruction and Building Materials
oaire.citation.volume265
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameBarreto Santos
person.givenNameMiguel
person.identifier.orcid0000-0001-9296-6643
relation.isAuthorOfPublicationa172351f-a295-4886-8465-4fbc1f932db1
relation.isAuthorOfPublication.latestForDiscoverya172351f-a295-4886-8465-4fbc1f932db1

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The incorporation of recycled aggregate (RA) in structural concrete requires deep knowledge of this material's potential and limitations by assessing its effect on the concrete properties. Alkali-silica reaction (ASR) is one of the most concerning degradation agents in concrete produced with natural aggregates, and more expectedly in recycled aggregate concrete (RAC), which motivated this study. ASR was analysed through expansion evolution in concrete mixes produced with different replacement levels of coarse natural aggregates (CNA) with reactive and non-reactive coarse recycled aggregates (CRA). In addition, concrete mixes were naturally and artificially aged to simulate the reaction at different ages. The influence of cement type on ASR development in RAC was also evaluated. The results showed that the incorporation of 20% of reactive RA did not affect concrete's expansion behaviour. The highest expansions were obtained when 100% of reactive RA and a higher strength class cement were used.
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