Influence of granitic aggregates from northeast Brazil on the alkali-aggregate reaction

Detalhes bibliográficos
Autor(a) principal: Gomes Neto,David de Paiva
Data de Publicação: 2014
Outros Autores: Conceição,Herbet, Lisboa,Vinícius Anselmo Carvalho, Santana,Rodrigo Soares de, Barreto,Ledjane Silva
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Materials research (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392014000700010
Resumo: The alkali-aggregate reaction (AAR) in concrete structures is a problem that has concerned engineers and researchers for decades. This reaction occurs when silicates in the aggregates react with the alkalis, forming an expanded gel that can cause cracks in the concrete and reduce its lifespan. The aim of this study was to characterize three coarse granitic aggregates employed in concrete production in northeastern Brazil, correlating petrographic analysis with the kinetics of silica dissolution and the evolution of expansions in mortar bars, assisted by SEM/EDS, XRD, and EDX. The presence of grains showing recrystallization into individual microcrystalline quartz subgrains was associated with faster dissolution of silica and greater expansion in mortar bars. Aggregates showing substantial deformation, such as stretched grains of quartz with strong undulatory extinction, experienced slower dissolution, with reaction and expansion occurring over longer periods that could not be detected using accelerated tests with mortar bars.
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spelling Influence of granitic aggregates from northeast Brazil on the alkali-aggregate reactiongranitic aggregatesalkali-aggregate reactionpetrographic analysismicrocrystalline quartzsilica dissolutionmortar bar expansionThe alkali-aggregate reaction (AAR) in concrete structures is a problem that has concerned engineers and researchers for decades. This reaction occurs when silicates in the aggregates react with the alkalis, forming an expanded gel that can cause cracks in the concrete and reduce its lifespan. The aim of this study was to characterize three coarse granitic aggregates employed in concrete production in northeastern Brazil, correlating petrographic analysis with the kinetics of silica dissolution and the evolution of expansions in mortar bars, assisted by SEM/EDS, XRD, and EDX. The presence of grains showing recrystallization into individual microcrystalline quartz subgrains was associated with faster dissolution of silica and greater expansion in mortar bars. Aggregates showing substantial deformation, such as stretched grains of quartz with strong undulatory extinction, experienced slower dissolution, with reaction and expansion occurring over longer periods that could not be detected using accelerated tests with mortar bars.ABM, ABC, ABPol2014-08-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392014000700010Materials Research v.17 suppl.1 2014reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/S1516-14392014005000045info:eu-repo/semantics/openAccessGomes Neto,David de PaivaConceição,HerbetLisboa,Vinícius Anselmo CarvalhoSantana,Rodrigo Soares deBarreto,Ledjane Silvaeng2015-11-06T00:00:00Zoai:scielo:S1516-14392014000700010Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2015-11-06T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.fl_str_mv Influence of granitic aggregates from northeast Brazil on the alkali-aggregate reaction
title Influence of granitic aggregates from northeast Brazil on the alkali-aggregate reaction
spellingShingle Influence of granitic aggregates from northeast Brazil on the alkali-aggregate reaction
Gomes Neto,David de Paiva
granitic aggregates
alkali-aggregate reaction
petrographic analysis
microcrystalline quartz
silica dissolution
mortar bar expansion
title_short Influence of granitic aggregates from northeast Brazil on the alkali-aggregate reaction
title_full Influence of granitic aggregates from northeast Brazil on the alkali-aggregate reaction
title_fullStr Influence of granitic aggregates from northeast Brazil on the alkali-aggregate reaction
title_full_unstemmed Influence of granitic aggregates from northeast Brazil on the alkali-aggregate reaction
title_sort Influence of granitic aggregates from northeast Brazil on the alkali-aggregate reaction
author Gomes Neto,David de Paiva
author_facet Gomes Neto,David de Paiva
Conceição,Herbet
Lisboa,Vinícius Anselmo Carvalho
Santana,Rodrigo Soares de
Barreto,Ledjane Silva
author_role author
author2 Conceição,Herbet
Lisboa,Vinícius Anselmo Carvalho
Santana,Rodrigo Soares de
Barreto,Ledjane Silva
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Gomes Neto,David de Paiva
Conceição,Herbet
Lisboa,Vinícius Anselmo Carvalho
Santana,Rodrigo Soares de
Barreto,Ledjane Silva
dc.subject.por.fl_str_mv granitic aggregates
alkali-aggregate reaction
petrographic analysis
microcrystalline quartz
silica dissolution
mortar bar expansion
topic granitic aggregates
alkali-aggregate reaction
petrographic analysis
microcrystalline quartz
silica dissolution
mortar bar expansion
description The alkali-aggregate reaction (AAR) in concrete structures is a problem that has concerned engineers and researchers for decades. This reaction occurs when silicates in the aggregates react with the alkalis, forming an expanded gel that can cause cracks in the concrete and reduce its lifespan. The aim of this study was to characterize three coarse granitic aggregates employed in concrete production in northeastern Brazil, correlating petrographic analysis with the kinetics of silica dissolution and the evolution of expansions in mortar bars, assisted by SEM/EDS, XRD, and EDX. The presence of grains showing recrystallization into individual microcrystalline quartz subgrains was associated with faster dissolution of silica and greater expansion in mortar bars. Aggregates showing substantial deformation, such as stretched grains of quartz with strong undulatory extinction, experienced slower dissolution, with reaction and expansion occurring over longer periods that could not be detected using accelerated tests with mortar bars.
publishDate 2014
dc.date.none.fl_str_mv 2014-08-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392014000700010
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392014000700010
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1516-14392014005000045
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv ABM, ABC, ABPol
publisher.none.fl_str_mv ABM, ABC, ABPol
dc.source.none.fl_str_mv Materials Research v.17 suppl.1 2014
reponame:Materials research (São Carlos. Online)
instname:Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
instname_str Universidade Federal de São Carlos (UFSCAR)
instacron_str ABM ABC ABPOL
institution ABM ABC ABPOL
reponame_str Materials research (São Carlos. Online)
collection Materials research (São Carlos. Online)
repository.name.fl_str_mv Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)
repository.mail.fl_str_mv dedz@power.ufscar.br
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