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Mechanical performance and autogenous and drying shrinkage of MgO-based recycled aggregate high-performance concrete

2022-01-03Journal article Restricted access
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dc.contributor.authorRevilla-Cuesta, V.
dc.contributor.authorEvangelista, Luis
dc.contributor.authorBrito, Jorge de
dc.contributor.authorSkaf, Marta
dc.contributor.authorOrtega-López, Vanesa
dc.date.accessioned2022-03-02T14:01:11Z
dc.date.available2022-03-02T14:01:11Z
dc.date.issued2022-01-03
dc.description.abstractThe high strength and durability of high-performance concrete (HPC) may be significantly reduced by shrinkage cracking. The use of reactive magnesium oxide (MgO) can reduce shrinkage of cement-based materials due to its expansive properties. This study intends to analyse the validity of MgO as shrinkage-reducing agent in recycled aggregate HPC. To do so, ten HPC mixes with 0%, 25%, and 100% of both early-age (7-days air curing) and matured (6-month air curing) RA were produced. In half of the mixes, 10% ordinary Portland cement was replaced with MgO. The use of MgO slightly worsened the mechanical behaviour of HPC, especially when combined with large amounts of RA. On the other hand, the expansion of MgO fully offset the autogenous shrinkage of HPC and reduced total shrinkage by around 20-40%. Water storage of RA, and its deferred release over time, produced a more efficient hydration of MgO, which in turn led to a further reduction of autogenous shrinkage. However, the increase of drying shrinkage caused by RA was greater than this decrease of autogenous shrinkage due to MgO, so the higher the RA content of HPC the lower the total shrinkage reduction when adding MgO. Thus, the decrease of total shrinkage caused by MgO was compensated by the shrinkage increase because of RA when adding amounts above 35% early-age RA and 42% matured RA. Therefore, despite the suitability of MgO as shrinkage-reducing agent in recycled aggregate HPC, its effectiveness was reduced with increasing amounts of RA.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationREVILLA-CUESTA, Victor; [et al] – Mechanical performance and autogenous and drying shrinkage of MgO-based recycled aggregate high-performance concrete. Construction and Building Materials. ISSN 0950-0618. Vol. 314, Part B (2022), pp. 1-18.pt_PT
dc.identifier.doi10.1016/j.conbuildmat.2021.125726pt_PT
dc.identifier.eissn1879-0526
dc.identifier.issn0950-0618
dc.identifier.urihttp://hdl.handle.net/10400.21/14358
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationFPU17/03374 - European Commissionpt_PT
dc.relationEST19/00263 - European Commissionpt_PT
dc.relationPID2020-113837RB-I00 - European Commissionpt_PT
dc.relation10.13039/501100011033 - European Commissionpt_PT
dc.relationUIC231 - Junta de Castilla y Leonpt_PT
dc.relationY135.GI - University of Burgospt_PT
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0950061821034607pt_PT
dc.subjectHigh-performance concretept_PT
dc.subjectRecycled aggregatespt_PT
dc.subjectRecycled aggregate's maturitypt_PT
dc.subjectMagnesium oxidept_PT
dc.subjectAutogenous shrinkagept_PT
dc.subjectDrying shrinkagept_PT
dc.titleMechanical performance and autogenous and drying shrinkage of MgO-based recycled aggregate high-performance concretept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage18pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleConstruction and Building Materialspt_PT
oaire.citation.volume314pt_PT
person.familyNameRevilla-Cuesta
person.familyNameFaria Rocha Evangelista
person.familyNameCaliço Lopes de Brito
person.familyNameSkaf
person.familyNameOrtega-López
person.givenNameVictor
person.givenNameLuís Manuel
person.givenNameJorge Manuel
person.givenNameMarta
person.givenNameVanesa
person.identifierB-9864-2011
person.identifierA-4299-2008
person.identifier.ciencia-idA612-1A5B-D93D
person.identifier.ciencia-id921D-3921-8308
person.identifier.orcid0000-0003-3337-6250
person.identifier.orcid0000-0001-8406-6864
person.identifier.orcid0000-0001-6766-2736
person.identifier.orcid0000-0001-7205-2692
person.identifier.orcid0000-0003-0212-355X
person.identifier.ridJ-6597-2017
person.identifier.scopus-author-id57211515349
person.identifier.scopus-author-id57201241744
person.identifier.scopus-author-id7003285554
person.identifier.scopus-author-id51565854300
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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