Assessment of the potential alkali reactivity of rhyolitic rocks from Argentina

cic.isFulltexttruees
cic.isPeerReviewedtruees
cic.lugarDesarrolloUniversidad Nacional del Sur es
cic.versioninfo:eu-repo/semantics/publishedVersiones
dc.date.accessioned2016-12-14T14:05:40Z
dc.date.available2016-12-14T14:05:40Z
dc.identifier.urihttps://digital.cic.gba.gob.ar/handle/11746/4992
dc.titleAssessment of the potential alkali reactivity of rhyolitic rocks from Argentinaen
dc.typeDocumento de conferenciaes
dcterms.abstractThe potential alkali-silica reactivity of volcanic rocks of rhyolitic composition, used as concrete aggregates, was assessed focusing mainly on their petrography. Eleven samples from the Argentine Patagonia (Provinces of Río Negro and Chubut) were examined using a petrographic microscope. Thin sections were used to evaluate sample texture, degree of alteration, the presence of volcanic glass in the matrix, and metastable minerals that may contribute silica to the reaction (ASR). Results from the petrographic study were compared with those from the mortar bar test (ASTM C-1260) and the dissolved silica determined by the chemical methods (ASTM C-289). It was concluded that rhyolitic rocks may develop deleterious reactions when they contain unweathered and/or altered glass in their matrices, and alteration minerals resulting from devitrification such as argillaceous minerals and cryptocrystalline silica. Rhyolitic rocks in which the matrix has completely recrystallized were found to be non-reactive.en
dcterms.creator.authorMarfil, Silvina Andreaes
dcterms.creator.authorMaiza, Pedroes
dcterms.extent6 p.es
dcterms.isPartOf.issue10th IAEG 2006 (Inglaterra)es
dcterms.isPartOf.seriesIAEG International Congresses
dcterms.issued2006-09
dcterms.languageIngléses
dcterms.licenseAttribution 4.0 International (BY 4.0)es
dcterms.subjectconcretoes
dcterms.subjectagregadoses
dcterms.subjectrocases
dcterms.subject.materiaGeologíaes

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