Please use this identifier to cite or link to this item: http://repositorio.lnec.pt:8080/jspui/handle/123456789/1010384
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dc.contributor.authorEsteves, H.pt_BR
dc.contributor.authorFernandes, I.pt_BR
dc.contributor.authorJaneiro, A.pt_BR
dc.contributor.authorSantos Silva, A.pt_BR
dc.contributor.authorPereira, M.pt_BR
dc.contributor.authorMedeiros, S.pt_BR
dc.contributor.authorNunes, J. C.pt_BR
dc.date.accessioned2018-01-19T10:16:32Zpt_BR
dc.date.accessioned2018-03-06T16:51:33Z-
dc.date.available2018-01-19T10:16:32Zpt_BR
dc.date.available2018-03-06T16:51:33Z-
dc.date.issued2017-12pt_BR
dc.identifier.citation10.1088/1755-1315/95/2/022040pt_BR
dc.identifier.urihttps://repositorio.lnec.pt/jspui/handle/123456789/1010384-
dc.description.abstractSeveral concrete structures show signs of deterioration resulting from internal chemical reactions, such as the alkali-silica reaction (ASR). It is well known that these swelling reactions occur in the presence of moisture, between some silica mineral phases present in the aggregates and the alkalis of the concrete, leading to the degradation of concrete structures and consequently compromising their safety. In most of the cases, rehabilitation, demolition or even rebuilding of such structures is needed and the effective costs can be very high. Volcanic rocks are commonly used as aggregates in concrete, and they are sometimes the only option due to the unavailability of other rock types. These rocks may contain different forms of silica that are deleterious to concrete, such as opal, chalcedony, cristobalite, tridymite and micro- to cryptocrystalline quartz, as well as Si-rich volcanic glass. Volcanic rocks are typically very finegrained and their constituting minerals are usually not distinguished under optical microscopy, thus leading to using complementary methods. The objective of this research is to find the more adequate analytical methods to identify silica phases that might be present in volcanic aggregates and cause ASR. The complementary methods used include X-Ray Diffraction (XRD), mineral acid digestion and Scanning Electron Microscopy with Energy Dispersive X-Ray Spectrometry (SEM/EDS), as well as Electron Probe Micro-Analysis (EPMA).pt_BR
dc.language.isoengpt_BR
dc.publisherIOP Publishing Ltdpt_BR
dc.rightsopenAccesspt_BR
dc.subjectASRpt_BR
dc.subjectVolcanic aggregatespt_BR
dc.subjectCharacterizationpt_BR
dc.subjectConcretept_BR
dc.titlePotentially reactive forms of silica in volcanic rocks using different analytical approachespt_BR
dc.typearticlept_BR
dc.description.pages9ppt_BR
dc.description.commentshis publication is supported by FCT- project UID/GEO/50019/2013 – IDL. The authors would like to acknowledge Benoit Fournier for having provided the Hawaii samples and having revised the paper, and to thank National Laboratory for Civil Engineering (LNEC) for their support through the project RE-IMPROVE – Expansive Reactions in Concrete – Prevention and mitigation of their effects. S. Medeiros also acknowledges the PhD scholarship granted by the FRCT (refª: M3.1.a/F/006/2015).pt_BR
dc.identifier.localPrague, Czech Republicpt_BR
dc.description.volume95pt_BR
dc.description.sectorDM/NMMpt_BR
dc.identifier.proc0204/112/19701pt_BR
dc.description.magazineIOP Conference Series: Earth and Environmental Sciencept_BR
dc.identifier.conftitleWorld Multidisciplinary Earth Sciences Symposium (WMESS 2017)pt_BR
dc.contributor.peer-reviewedSIMpt_BR
dc.contributor.academicresearchersSIMpt_BR
dc.contributor.arquivoSIMpt_BR
Appears in Collections:DM/NMM - Comunicações a congressos e artigos de revista

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