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dc.contributor.authorRejini, R.pt_BR
dc.contributor.authorSoares, A. C.pt_BR
dc.contributor.authorEsteves, T.pt_BR
dc.contributor.authorSantos Silva, A.pt_BR
dc.contributor.authorLabrincha, J. A.pt_BR
dc.contributor.authorFerreira, V.pt_BR
dc.contributor.editorÁngel Palomo, Aniceto Zaragoza, Juan Carlos López Agüípt_BR
dc.date.accessioned2011-07-31T13:11:21Zpt_BR
dc.date.accessioned2014-10-20T16:32:02Zpt_BR
dc.date.accessioned2017-04-13T09:11:26Z-
dc.date.available2011-07-31T13:11:21Zpt_BR
dc.date.available2014-10-20T16:32:02Zpt_BR
dc.date.available2017-04-13T09:11:26Z-
dc.date.issued2011-07pt_BR
dc.identifier.citationAbstracts and Proceedings of the XIII International Congress on the Chemistry of Cementpt_BR
dc.identifier.isbn84-7292-399-7pt_BR
dc.identifier.urihttp://repositorio.lnec.pt:8080/jspui/handle/123456789/1002290-
dc.description.abstractThe alkali–silica reaction (ASR) in concrete occurs by reaction of certain silica phases in the aggregates with alkalis and hydroxide ions in the pore solution of the hydrating cement to produce a hydrous alkali-silicate gel. This gel can swell by incorporating large amounts of water, causing severe and irreversible expansion and cracking of the concrete. The level of expansion and disruption in concrete containing reactive aggregate depends on the alkali content of the concrete and the reactivity of the aggregate. The levels of alkali that trigger the expansion depend, however, on the reactivity of the aggregates. Alkalis from Portland cement (OPC) are one of the major sources of these ions in concrete. The use of industrial by-products such as fly ash and slag has been found to be an effective preventive measure against ASR in concrete. This article presents the performance of biomass fly ash - an industrial by-product - in the mitigation/inhibition of ASR in concrete. Laboratory expansion tests were conducted to evaluate the performance of biomass fly ash, in replacement of OPC by 20% and 30% (w/w) in the experiments (ASTM C1260/ASTM C1567). The results revealed that biomass fly ash has a good potential in the expansion inhibition due to ASR.pt_BR
dc.description.sponsorshipThe authors wish to acknowledge Fundação para a Ciência e Tecnologia (FCT) for the financial support under project EXREACT PTDC/CTM/65243/2006) and PhD grant SFRH/BD/32500/2006.pt_BR
dc.language.isoengpt_BR
dc.publisherInstituto de Ciencias de la Construcción Eduardo Torrojapt_BR
dc.rightsopenAccesspt_BR
dc.subjectAlkali-silica reactionpt_BR
dc.subjectBiomass fly ashpt_BR
dc.subjectConcretept_BR
dc.subjectIndustrial by-products.pt_BR
dc.titleInvestigation of Alkali-Silica Reaction in Concretes with Biomass Fly Ashpt_BR
dc.typeconferenceObjectpt_BR
dc.identifier.localedicaoMadridpt_BR
dc.description.figures1pt_BR
dc.description.tables4pt_BR
dc.description.pages7ppt_BR
dc.identifier.seminarioXIII International Congress on the Chemistry of Cementpt_BR
dc.identifier.localMadridpt_BR
dc.description.sectorDM/NMMpt_BR
dc.description.year2011pt_BR
dc.description.data3 a 8 de Julhopt_BR
Appears in Collections:DM/NMM - Comunicações a congressos e artigos de revista

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