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Evaluation of alkali-silica reaction in recycled aggregates: The applicability of the mortar bar test

2021-09-13Artigo científico Acesso restrito
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datacite.subject.fosEngenharia e Tecnologia::Engenharia Civil
datacite.subject.fosCiências Naturais::Outras Ciências Naturais
datacite.subject.sdg03:Saúde de Qualidade
datacite.subject.sdg07:Energias Renováveis e Acessíveis
datacite.subject.sdg11:Cidades e Comunidades Sustentáveis
dc.contributor.authorSantos, Miguel Barreto
dc.contributor.authorBrito, Jorge de
dc.contributor.authorSilva, António Santos
dc.contributor.authorHawreen, A.
dc.date.accessioned2026-02-03T17:51:06Z
dc.date.available2026-02-03T17:51:06Z
dc.date.issued2021-09-13
dc.description.abstractAlkali-silica reaction (ASR) is considered one of the most concrete degrading agents causing expansion due to a gel formation that swells in contact with water. In this regard, this study investigates ASR through an expansion test of mortars produced with recycled aggregates (RA). The RA were prepared by crushing source concrete (SC) mixes that were previously produced with alkali reactive natural aggregates (NA). SC mixes were exposed to different environments to accelerate ASR. The mortars were tested using the ASTM C1260 accelerated mortar bar test (AMBT). For comparison purposes, the aggregates were also tested using the RILEM AAR-3 concrete prism test (CPT). As for mortars with NA, changes were needed to optimize the mix production procedure to obtain a mouldable mortar and more trustworthy values. For this purpose, RA-mortars were produced with RA obtained from primary or secondary crushing, different water adjustment types, including the addition of constant volumes of water to maintain a mouldable slump, the addition of 50% of the total absorption water, and pre-saturation of RA. The results showed that the adjustment type of RA absorption water in the mix highly influenced the expansion results. The addition of constant volumes of water to maintain a mouldable slump led to the more trustworthy values. The expansion limits of ASTM C1260 seems be too high for fine RA's evaluation.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, A. Hawreen, Evaluation of alkali-silica reaction in recycled aggregates: The applicability of the mortar bar test, Construction and Building Materials, Volume 299, 2021, 124250, ISSN 0950-0618, https://doi.org/10.1016/j.conbuildmat.2021.124250.
dc.identifier.doi10.1016/j.conbuildmat.2021.124250
dc.identifier.issn0950-0618
dc.identifier.urihttp://hdl.handle.net/10400.8/15530
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relation.hasversionhttps://www.sciencedirect.com/science/article/pii/S0950061821020109?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.subjectConcrete
dc.subjectDegradation
dc.subjectAMBT
dc.titleEvaluation of alkali-silica reaction in recycled aggregates: The applicability of the mortar bar testeng
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage10
oaire.citation.startPage1
oaire.citation.titleConstruction and Building Materials
oaire.citation.volume299
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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Alkali-silica reaction (ASR) is considered one of the most concrete degrading agents causing expansion due to a gel formation that swells in contact with water. In this regard, this study investigates ASR through an expansion test of mortars produced with recycled aggregates (RA). The RA were prepared by crushing source concrete (SC) mixes that were previously produced with alkali reactive natural aggregates (NA). SC mixes were exposed to different environments to accelerate ASR. The mortars were tested using the ASTM C1260 accelerated mortar bar test (AMBT). For comparison purposes, the aggregates were also tested using the RILEM AAR-3 concrete prism test (CPT). As for mortars with NA, changes were needed to optimize the mix production procedure to obtain a mouldable mortar and more trustworthy values. For this purpose, RA-mortars were produced with RA obtained from primary or secondary crushing, different water adjustment types, including the addition of constant volumes of water to maintain a mouldable slump, the addition of 50% of the total absorption water, and pre-saturation of RA. The results showed that the adjustment type of RA absorption water in the mix highly influenced the expansion results. The addition of constant volumes of water to maintain a mouldable slump led to the more trustworthy values. The expansion limits of ASTM C1260 seems be too high for fine RA's evaluation.
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