Estudo de matrizes cimentícias ternárias contendo sílica ativa e nanossílica
Autor(a) principal: | |
---|---|
Data de Publicação: | 2019 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFG |
Texto Completo: | http://repositorio.bc.ufg.br/tede/handle/tede/10917 |
Resumo: | The reinforcement corrosion, which significantly affects the country's coastal regions, is a serious and costly pathological manifestation for civil construction. Within this scenario, the literature shows that silica fume and nanosilica are highly effective pozzolans for increasing the strength and durability of structures in general. Even so, there are few studies that analyze in depth the microstructural changes that occur in this material through the combined use of these two additions. Therefore, it was sought with this work to explain the microstructural mechanisms, responsible for the increase of durability in cementitious matrices, produced with additions of active silica fume and nanosilica in a fixed optimum content in partial replacement to the Portland cement mass and in two water/bind (w/b) (0.4 and 0.6). For this, several techniques were used, including analytical and imaging techniques: pore solution analysis, Scanning Electron Microscopy (SEM), X-ray microtomography, thermal analysis and calorimetry, in addition to mechanical characterization. The results showed that the combination of the additions promoted the reduction of pore solution's conductivity and ionic strength, changes in the evolution of hydration and hydrated products and greater compacting, densification and transformation of the porous structure of the concrete with up to 50% compressive strength increments. Keywords: Concrete, microstructure, durability, silica fume, nanosilica. |
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Oliveira, Andrielli Morais dehttp://lattes.cnpq.br/9590390602101344Cascudo, Oswaldohttp://lattes.cnpq.br/3336749062812376Oliveira, Andrielli Morais deMatos, Oswaldo CascudoFidelis, Maria Ernestina AlvesCascudo, Helena Carasekhttp://lattes.cnpq.br/3218250658387604Pereira, Ana Paula de Oliveira2020-11-09T13:27:24Z2020-11-09T13:27:24Z2019-11-20OLIVEIRA, A. P. Estudo de matrizes cimentícias ternárias contendo sílica ativa e nanossílica. 2019. 144 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2019.http://repositorio.bc.ufg.br/tede/handle/tede/10917ark:/38995/0013000001jrmThe reinforcement corrosion, which significantly affects the country's coastal regions, is a serious and costly pathological manifestation for civil construction. Within this scenario, the literature shows that silica fume and nanosilica are highly effective pozzolans for increasing the strength and durability of structures in general. Even so, there are few studies that analyze in depth the microstructural changes that occur in this material through the combined use of these two additions. Therefore, it was sought with this work to explain the microstructural mechanisms, responsible for the increase of durability in cementitious matrices, produced with additions of active silica fume and nanosilica in a fixed optimum content in partial replacement to the Portland cement mass and in two water/bind (w/b) (0.4 and 0.6). For this, several techniques were used, including analytical and imaging techniques: pore solution analysis, Scanning Electron Microscopy (SEM), X-ray microtomography, thermal analysis and calorimetry, in addition to mechanical characterization. The results showed that the combination of the additions promoted the reduction of pore solution's conductivity and ionic strength, changes in the evolution of hydration and hydrated products and greater compacting, densification and transformation of the porous structure of the concrete with up to 50% compressive strength increments. Keywords: Concrete, microstructure, durability, silica fume, nanosilica.A corrosão de armaduras, que afeta significativamente as regiões litorâneas do país, é uma manifestação patológica grave e onerosa para a construção civil. Dentro deste cenário, a literatura mostra que a sílica ativa e a nanossílica são pozolanas muito eficazes para o incremento da resistência e da durabilidade de estruturas, em geral. Ainda assim, poucas são as pesquisas que analisam de forma aprofundada as alterações microestruturais que ocorrem nesse material pelo uso combinado dessas duas adições. Por isso, buscou-se com este trabalho explicar os mecanismos microestruturais, responsáveis pelo acréscimo da durabilidade em matrizes cimentícias, produzidas com adições de sílica ativa e nanossílica em um teor ótimo fixo em substituição parcial à massa de cimento Portland e em duas relações água/ligante (a/lig) (0,4 e 0,6). Para isso, foram utilizadas várias técnicas, incluindo as analíticas e de imagem: análise da solução do poro, microscopia eletrônica de varredura (MEV), microtomografia por raios X, análises térmicas e calorimetria, além de caracterização mecânica. Os resultados evidenciaram que a combinação das adições promoveu a redução da condutividade e força iônica da solução do poro, alterações na evolução da hidratação e produtos hidratados e maior compactação, densificação e transformação da estrutura porosa do concreto com incrementos de até 50% da resistência à compressão.Submitted by Marlene Santos (marlene.bc.ufg@gmail.com) on 2020-11-07T14:35:19Z No. of bitstreams: 2 license_rdf: 805 bytes, checksum: 4460e5956bc1d1639be9ae6146a50347 (MD5) Dissertação - Ana Paula de Oliveira Pereira - 2019.pdf: 7147574 bytes, checksum: 88c26a7be35f3b0f21756b5360f27546 (MD5)Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2020-11-09T13:27:24Z (GMT) No. of bitstreams: 2 license_rdf: 805 bytes, checksum: 4460e5956bc1d1639be9ae6146a50347 (MD5) Dissertação - Ana Paula de Oliveira Pereira - 2019.pdf: 7147574 bytes, checksum: 88c26a7be35f3b0f21756b5360f27546 (MD5)Made available in DSpace on 2020-11-09T13:27:24Z (GMT). No. of bitstreams: 2 license_rdf: 805 bytes, checksum: 4460e5956bc1d1639be9ae6146a50347 (MD5) Dissertação - Ana Paula de Oliveira Pereira - 2019.pdf: 7147574 bytes, checksum: 88c26a7be35f3b0f21756b5360f27546 (MD5) Previous issue date: 2019-11-20Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESporUniversidade Federal de GoiásPrograma de Pós-graduação em Geotecnia, Estruturas e Construção Civil (EEC)UFGBrasilEscola de Engenharia Civil e Ambiental - EECA (RG)Attribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessConcretoMicroestruturaDurabilidadeSílica ativaNanossílicaConcreteMicrostructureDurabilitySilica fumeNanosilicaENGENHARIAS::ENGENHARIA CIVIL::CONSTRUCAO CIVILEstudo de matrizes cimentícias ternárias contendo sílica ativa e nanossílicaStudy of ternary cementitious matrices containing silica fume and nanosilicainfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis6050050050050033971reponame:Repositório Institucional da UFGinstname:Universidade Federal de Goiás (UFG)instacron:UFGLICENSElicense.txtlicense.txttext/plain; charset=utf-81748http://repositorio.bc.ufg.br/tede/bitstreams/854909d3-19b3-41e8-8037-62ba623fcdd6/download8a4605be74aa9ea9d79846c1fba20a33MD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8805http://repositorio.bc.ufg.br/tede/bitstreams/c383d0e3-4a08-4605-92b8-d93996a807d5/download4460e5956bc1d1639be9ae6146a50347MD52ORIGINALDissertação - Ana Paula de Oliveira Pereira - 2019.pdfDissertação - Ana Paula de Oliveira Pereira - 2019.pdfapplication/pdf7147574http://repositorio.bc.ufg.br/tede/bitstreams/fc175279-8a05-4336-9a4f-2ae76c40a5bf/download88c26a7be35f3b0f21756b5360f27546MD53tede/109172020-11-09 10:27:25.166http://creativecommons.org/licenses/by-nc-nd/4.0/Attribution-NonCommercial-NoDerivatives 4.0 Internationalopen.accessoai:repositorio.bc.ufg.br:tede/10917http://repositorio.bc.ufg.br/tedeRepositório InstitucionalPUBhttp://repositorio.bc.ufg.br/oai/requesttasesdissertacoes.bc@ufg.bropendoar:2020-11-09T13:27:25Repositório Institucional da UFG - Universidade Federal de Goiás (UFG)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 |
dc.title.pt_BR.fl_str_mv |
Estudo de matrizes cimentícias ternárias contendo sílica ativa e nanossílica |
dc.title.alternative.eng.fl_str_mv |
Study of ternary cementitious matrices containing silica fume and nanosilica |
title |
Estudo de matrizes cimentícias ternárias contendo sílica ativa e nanossílica |
spellingShingle |
Estudo de matrizes cimentícias ternárias contendo sílica ativa e nanossílica Pereira, Ana Paula de Oliveira Concreto Microestrutura Durabilidade Sílica ativa Nanossílica Concrete Microstructure Durability Silica fume Nanosilica ENGENHARIAS::ENGENHARIA CIVIL::CONSTRUCAO CIVIL |
title_short |
Estudo de matrizes cimentícias ternárias contendo sílica ativa e nanossílica |
title_full |
Estudo de matrizes cimentícias ternárias contendo sílica ativa e nanossílica |
title_fullStr |
Estudo de matrizes cimentícias ternárias contendo sílica ativa e nanossílica |
title_full_unstemmed |
Estudo de matrizes cimentícias ternárias contendo sílica ativa e nanossílica |
title_sort |
Estudo de matrizes cimentícias ternárias contendo sílica ativa e nanossílica |
author |
Pereira, Ana Paula de Oliveira |
author_facet |
Pereira, Ana Paula de Oliveira |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Oliveira, Andrielli Morais de |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/9590390602101344 |
dc.contributor.advisor-co1.fl_str_mv |
Cascudo, Oswaldo |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/3336749062812376 |
dc.contributor.referee1.fl_str_mv |
Oliveira, Andrielli Morais de |
dc.contributor.referee2.fl_str_mv |
Matos, Oswaldo Cascudo |
dc.contributor.referee3.fl_str_mv |
Fidelis, Maria Ernestina Alves |
dc.contributor.referee4.fl_str_mv |
Cascudo, Helena Carasek |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/3218250658387604 |
dc.contributor.author.fl_str_mv |
Pereira, Ana Paula de Oliveira |
contributor_str_mv |
Oliveira, Andrielli Morais de Cascudo, Oswaldo Oliveira, Andrielli Morais de Matos, Oswaldo Cascudo Fidelis, Maria Ernestina Alves Cascudo, Helena Carasek |
dc.subject.por.fl_str_mv |
Concreto Microestrutura Durabilidade Sílica ativa Nanossílica |
topic |
Concreto Microestrutura Durabilidade Sílica ativa Nanossílica Concrete Microstructure Durability Silica fume Nanosilica ENGENHARIAS::ENGENHARIA CIVIL::CONSTRUCAO CIVIL |
dc.subject.eng.fl_str_mv |
Concrete Microstructure Durability Silica fume Nanosilica |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA CIVIL::CONSTRUCAO CIVIL |
description |
The reinforcement corrosion, which significantly affects the country's coastal regions, is a serious and costly pathological manifestation for civil construction. Within this scenario, the literature shows that silica fume and nanosilica are highly effective pozzolans for increasing the strength and durability of structures in general. Even so, there are few studies that analyze in depth the microstructural changes that occur in this material through the combined use of these two additions. Therefore, it was sought with this work to explain the microstructural mechanisms, responsible for the increase of durability in cementitious matrices, produced with additions of active silica fume and nanosilica in a fixed optimum content in partial replacement to the Portland cement mass and in two water/bind (w/b) (0.4 and 0.6). For this, several techniques were used, including analytical and imaging techniques: pore solution analysis, Scanning Electron Microscopy (SEM), X-ray microtomography, thermal analysis and calorimetry, in addition to mechanical characterization. The results showed that the combination of the additions promoted the reduction of pore solution's conductivity and ionic strength, changes in the evolution of hydration and hydrated products and greater compacting, densification and transformation of the porous structure of the concrete with up to 50% compressive strength increments. Keywords: Concrete, microstructure, durability, silica fume, nanosilica. |
publishDate |
2019 |
dc.date.issued.fl_str_mv |
2019-11-20 |
dc.date.accessioned.fl_str_mv |
2020-11-09T13:27:24Z |
dc.date.available.fl_str_mv |
2020-11-09T13:27:24Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
OLIVEIRA, A. P. Estudo de matrizes cimentícias ternárias contendo sílica ativa e nanossílica. 2019. 144 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2019. |
dc.identifier.uri.fl_str_mv |
http://repositorio.bc.ufg.br/tede/handle/tede/10917 |
dc.identifier.dark.fl_str_mv |
ark:/38995/0013000001jrm |
identifier_str_mv |
OLIVEIRA, A. P. Estudo de matrizes cimentícias ternárias contendo sílica ativa e nanossílica. 2019. 144 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2019. ark:/38995/0013000001jrm |
url |
http://repositorio.bc.ufg.br/tede/handle/tede/10917 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.program.fl_str_mv |
60 |
dc.relation.confidence.fl_str_mv |
500 500 500 500 |
dc.relation.department.fl_str_mv |
3 |
dc.relation.cnpq.fl_str_mv |
397 |
dc.relation.sponsorship.fl_str_mv |
1 |
dc.rights.driver.fl_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Universidade Federal de Goiás |
dc.publisher.program.fl_str_mv |
Programa de Pós-graduação em Geotecnia, Estruturas e Construção Civil (EEC) |
dc.publisher.initials.fl_str_mv |
UFG |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Escola de Engenharia Civil e Ambiental - EECA (RG) |
publisher.none.fl_str_mv |
Universidade Federal de Goiás |
dc.source.none.fl_str_mv |
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Universidade Federal de Goiás (UFG) |
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