Microestrutura do cobrimento de concretos com altos teores de escória e cinza volante ativadas por cimento portland e cal hidratada
Ano de defesa: | 2007 |
---|---|
Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Santa Maria
|
Programa de Pós-Graduação: |
Programa de Pós-Graduação em Engenharia Civil
|
Departamento: |
Engenharia Civil
|
País: |
BR
|
Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://repositorio.ufsm.br/handle/1/7882 |
Resumo: | In the history of the concrete structures there was a time in which the mechanical resistance was the most important property for the designers. However due to amount of pathologies in the concrete structures and your respective worn-out amounts in recovery, other feature is being prioritized: the durability. And for environmental reasons as global heating, pollution and the raw materials decrease, the sustentability is prioritized. Aiming at collaborate to these factors these paper has as objective analyzes the microstructure of the covercrete with substitution in mass of 90% of cement for mineral additions. Were researched three types of concretes reference concrete (100%CPV-ARI), concrete with 70%Slag+20%FlyAsh and other similar mixture with addition of 20% of hydrated lime with the intention of partially restoring the hydroxide of calcium consumed by the pozzolanics reactions - named respectively of R, EV and EVC. Aims at, more specifically, to establish the differences microstructures of the covercrete of the prototypes(beams-70x20x15cm), through the tests of combined water, x-ray diffraction and scanning electron microscopy. For comparison effect, compressive strength test were also accomplished in molded cylinders(10x20cm) and cured in humid camera and in the cylinders(10x20cm) extracted of the cured prototypes in environmental conditions after 7 days of humid cure. Were studied three relationships a/ag: 0.40, 0.60 and 0.80 for the concrete R and 0.30, 0.40 and 0.50 for the concretes with additions, obtaining resistance between 20 and 70MPa. The tests of the microstructure were accomplished in the 91 and 300 days, with samples starting from the surface of the prototypes, in layers, in the depths of: 0-1.0cm(C1), 2.0-3.0cm(C2) and 4.5-5.5cm(C3). Evolution of the strength was accompanied in the ages of 28, 91, 182 and 300 days. Results were analyzed in equality of a/ag and compressive strength. For a/ag 0.40 and 0.50, to 28 days of age, in relation to reference concrete, the strength of the concrete EV was 54.0% on average of this, and the concrete EVC it was 68.5%. In the final age of 300 days, the percentile are of 72.5% and 76%. In both tests ages, with the increase of the depth of the layer occurs: decrease in the intruded volume total mercury, decrease in the tenor of combined water for the reference concrete and increment in the concretes with additions, decrease in the intensity of pick of the hydroxide of calcium in the three mixtures, decrease in the intensity of pick of the hydrated silicate for the reference concrete and increment in the concretes with mineral additions. Analysis on scanning electron microscopy showed refinement in the size of the grains, larger compact and uniformity in the mixtures with additions |
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2007-07-022007-07-022007-03-08BRIZOLA, Rodrigo Matzenbacher. Microstructure of covercrete concretes with high contents of slag and fly ash activated by portland cemente and hydrated lime. 2007. 179 f. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal de Santa Maria, Santa Maria, 2007.http://repositorio.ufsm.br/handle/1/7882In the history of the concrete structures there was a time in which the mechanical resistance was the most important property for the designers. However due to amount of pathologies in the concrete structures and your respective worn-out amounts in recovery, other feature is being prioritized: the durability. And for environmental reasons as global heating, pollution and the raw materials decrease, the sustentability is prioritized. Aiming at collaborate to these factors these paper has as objective analyzes the microstructure of the covercrete with substitution in mass of 90% of cement for mineral additions. Were researched three types of concretes reference concrete (100%CPV-ARI), concrete with 70%Slag+20%FlyAsh and other similar mixture with addition of 20% of hydrated lime with the intention of partially restoring the hydroxide of calcium consumed by the pozzolanics reactions - named respectively of R, EV and EVC. Aims at, more specifically, to establish the differences microstructures of the covercrete of the prototypes(beams-70x20x15cm), through the tests of combined water, x-ray diffraction and scanning electron microscopy. For comparison effect, compressive strength test were also accomplished in molded cylinders(10x20cm) and cured in humid camera and in the cylinders(10x20cm) extracted of the cured prototypes in environmental conditions after 7 days of humid cure. Were studied three relationships a/ag: 0.40, 0.60 and 0.80 for the concrete R and 0.30, 0.40 and 0.50 for the concretes with additions, obtaining resistance between 20 and 70MPa. The tests of the microstructure were accomplished in the 91 and 300 days, with samples starting from the surface of the prototypes, in layers, in the depths of: 0-1.0cm(C1), 2.0-3.0cm(C2) and 4.5-5.5cm(C3). Evolution of the strength was accompanied in the ages of 28, 91, 182 and 300 days. Results were analyzed in equality of a/ag and compressive strength. For a/ag 0.40 and 0.50, to 28 days of age, in relation to reference concrete, the strength of the concrete EV was 54.0% on average of this, and the concrete EVC it was 68.5%. In the final age of 300 days, the percentile are of 72.5% and 76%. In both tests ages, with the increase of the depth of the layer occurs: decrease in the intruded volume total mercury, decrease in the tenor of combined water for the reference concrete and increment in the concretes with additions, decrease in the intensity of pick of the hydroxide of calcium in the three mixtures, decrease in the intensity of pick of the hydrated silicate for the reference concrete and increment in the concretes with mineral additions. Analysis on scanning electron microscopy showed refinement in the size of the grains, larger compact and uniformity in the mixtures with additionsNa história das estruturas de concreto houve período no qual a resistência mecânica foi a propriedade mais importante para os projetistas. Porém, devido ao surgimento de manifestações patológicas nas estruturas de concreto e seus respectivos montantes gastos em recuperação, outro aspecto também está sendo considerado: a durabilidade. Por motivos ambientais como aquecimento global, poluição e diminuição das matérias-primas, prioriza-se também a sustentabilidade. Visando colaborar com estes fatores o presente trabalho tem como objetivo analisar a microestrutura da camada de cobrimento de concretos com substituição em massa de 90% de cimento Portland por adições minerais. Foram pesquisadas três misturas: concreto de referência (100%CPV-ARI), concreto com 70%Escória+20%CinzaVolante e outra mistura similar com adição de 20% de cal hidratada com o intuito de repor parcialmente o hidróxido de cálcio consumido pelas reações pozolânicas as quais foram nomeadas respectivamente de R, EV e EVC. Objetiva, mais especificamente, estabelecer as diferenças microestruturais da camada de cobrimento de protótipos (vigas 70x20x15cm), através dos ensaios de porosimetria por intrusão de mercúrio, água combinada, difração de raios-X e microscopia eletrônica de varredura. Para efeito de comparação, também foram realizados ensaios de resistência à compressão em corpos-de-prova (10x20cm) moldados e curados em câmara úmida e em testemunhos (10x20cm) extraídos dos protótipos curados em condições ambientais após 7 dias de cura úmida. Foram estudadas três relações a/ag: 0.40, 0.60 e 0.80 para o concreto R e 0.30, 0.40 e 0.50 para os concretos com adições, obtendo resistências entre 20 e 70MPa. Os ensaios da microestrutura foram realizados aos 91 e 300 dias, com amostras a partir da face dos protótipos, em três camadas, nas profundidades: 0-1cm(C1), 2- 3cm(C2) e 4.5-5.5cm(C3). A evolução da resistência foi acompanhada nas idades de 28, 91, 182 e 300 dias. Os resultados foram analisados em igualdade de relação a/ag e resistência à compressão. Para as relações a/ag 0.40 e 0.50, aos 28 dias de idade, em relação ao concreto de referência, a resistência do concreto EV foi em média 54.0% deste, e o concreto EVC foi 68.5%. E na idade final de 300 dias, os percentuais são de 72.5% e 76%. Em ambas as idades de ensaio, com o aumento da profundidade da camada ocorreu: decréscimo no volume total intrudido de mercúrio, decréscimo no teor de água combinada para o concreto de referência e acréscimo nos concretos com adições, decréscimo na intensidade de pico do hidróxido de cálcio nas três misturas, decréscimo na intensidade de pico do silicato de cálcio hidratado para o concreto de referência e acréscimo nos concretos com adições minerais. A análise das micrografias mostrou refinamento no tamanho dos grãos, maior densificação e uniformidade nas misturas com adiçõesapplication/pdfporUniversidade Federal de Santa MariaPrograma de Pós-Graduação em Engenharia CivilUFSMBREngenharia CivilConcretoEscóriaCinza volanteCalCobrimentoMicroestruturaConcreteSlagFly ashHydrated limeCovercreteMicrostructureCNPQ::ENGENHARIAS::ENGENHARIA CIVILMicroestrutura do cobrimento de concretos com altos teores de escória e cinza volante ativadas por cimento portland e cal hidratadaMicrostructure of covercrete concretes with high contents of slag and fly ash activated by portland cemente and hydrated limeinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisIsaia, Geraldo Cechellahttp://lattes.cnpq.br/8260652949733370Gastaldini, Antonio Luiz Guerrahttp://lattes.cnpq.br/9293085240832049Molin, Denise Carpena Coitinho Dalhttp://lattes.cnpq.br/0887502044987077http://lattes.cnpq.br/0572384586839905Brizola, Rodrigo Matzenbacher3001000000034003003003003005d5ff349-6e1b-45f0-a3fc-dfb31b446dec948c9d71-2d78-424e-a51c-9d4345d4c4c16a0102db-7d1b-4dd8-8f1d-555760a238ebe8e495c3-f8bb-464f-9e83-b8df728443dainfo:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações do UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALRodrigo.pdfapplication/pdf7955803http://repositorio.ufsm.br/bitstream/1/7882/1/Rodrigo.pdf6888e8f51928bffa91626a21e70aab2dMD51TEXTRodrigo.pdf.txtRodrigo.pdf.txtExtracted texttext/plain285917http://repositorio.ufsm.br/bitstream/1/7882/2/Rodrigo.pdf.txta7e5bf826382bc92c53c39271053213dMD52THUMBNAILRodrigo.pdf.jpgRodrigo.pdf.jpgIM Thumbnailimage/jpeg5243http://repositorio.ufsm.br/bitstream/1/7882/3/Rodrigo.pdf.jpg44c2e50ea962c9aac672f2f71eb95d73MD531/78822023-01-02 11:16:40.083oai:repositorio.ufsm.br:1/7882Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2023-01-02T14:16:40Biblioteca Digital de Teses e Dissertações do UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.por.fl_str_mv |
Microestrutura do cobrimento de concretos com altos teores de escória e cinza volante ativadas por cimento portland e cal hidratada |
dc.title.alternative.eng.fl_str_mv |
Microstructure of covercrete concretes with high contents of slag and fly ash activated by portland cemente and hydrated lime |
title |
Microestrutura do cobrimento de concretos com altos teores de escória e cinza volante ativadas por cimento portland e cal hidratada |
spellingShingle |
Microestrutura do cobrimento de concretos com altos teores de escória e cinza volante ativadas por cimento portland e cal hidratada Brizola, Rodrigo Matzenbacher Concreto Escória Cinza volante Cal Cobrimento Microestrutura Concrete Slag Fly ash Hydrated lime Covercrete Microstructure CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
title_short |
Microestrutura do cobrimento de concretos com altos teores de escória e cinza volante ativadas por cimento portland e cal hidratada |
title_full |
Microestrutura do cobrimento de concretos com altos teores de escória e cinza volante ativadas por cimento portland e cal hidratada |
title_fullStr |
Microestrutura do cobrimento de concretos com altos teores de escória e cinza volante ativadas por cimento portland e cal hidratada |
title_full_unstemmed |
Microestrutura do cobrimento de concretos com altos teores de escória e cinza volante ativadas por cimento portland e cal hidratada |
title_sort |
Microestrutura do cobrimento de concretos com altos teores de escória e cinza volante ativadas por cimento portland e cal hidratada |
author |
Brizola, Rodrigo Matzenbacher |
author_facet |
Brizola, Rodrigo Matzenbacher |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Isaia, Geraldo Cechella |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/8260652949733370 |
dc.contributor.referee1.fl_str_mv |
Gastaldini, Antonio Luiz Guerra |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/9293085240832049 |
dc.contributor.referee2.fl_str_mv |
Molin, Denise Carpena Coitinho Dal |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/0887502044987077 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/0572384586839905 |
dc.contributor.author.fl_str_mv |
Brizola, Rodrigo Matzenbacher |
contributor_str_mv |
Isaia, Geraldo Cechella Gastaldini, Antonio Luiz Guerra Molin, Denise Carpena Coitinho Dal |
dc.subject.por.fl_str_mv |
Concreto Escória Cinza volante Cal Cobrimento Microestrutura |
topic |
Concreto Escória Cinza volante Cal Cobrimento Microestrutura Concrete Slag Fly ash Hydrated lime Covercrete Microstructure CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
dc.subject.eng.fl_str_mv |
Concrete Slag Fly ash Hydrated lime Covercrete Microstructure |
dc.subject.cnpq.fl_str_mv |
CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
description |
In the history of the concrete structures there was a time in which the mechanical resistance was the most important property for the designers. However due to amount of pathologies in the concrete structures and your respective worn-out amounts in recovery, other feature is being prioritized: the durability. And for environmental reasons as global heating, pollution and the raw materials decrease, the sustentability is prioritized. Aiming at collaborate to these factors these paper has as objective analyzes the microstructure of the covercrete with substitution in mass of 90% of cement for mineral additions. Were researched three types of concretes reference concrete (100%CPV-ARI), concrete with 70%Slag+20%FlyAsh and other similar mixture with addition of 20% of hydrated lime with the intention of partially restoring the hydroxide of calcium consumed by the pozzolanics reactions - named respectively of R, EV and EVC. Aims at, more specifically, to establish the differences microstructures of the covercrete of the prototypes(beams-70x20x15cm), through the tests of combined water, x-ray diffraction and scanning electron microscopy. For comparison effect, compressive strength test were also accomplished in molded cylinders(10x20cm) and cured in humid camera and in the cylinders(10x20cm) extracted of the cured prototypes in environmental conditions after 7 days of humid cure. Were studied three relationships a/ag: 0.40, 0.60 and 0.80 for the concrete R and 0.30, 0.40 and 0.50 for the concretes with additions, obtaining resistance between 20 and 70MPa. The tests of the microstructure were accomplished in the 91 and 300 days, with samples starting from the surface of the prototypes, in layers, in the depths of: 0-1.0cm(C1), 2.0-3.0cm(C2) and 4.5-5.5cm(C3). Evolution of the strength was accompanied in the ages of 28, 91, 182 and 300 days. Results were analyzed in equality of a/ag and compressive strength. For a/ag 0.40 and 0.50, to 28 days of age, in relation to reference concrete, the strength of the concrete EV was 54.0% on average of this, and the concrete EVC it was 68.5%. In the final age of 300 days, the percentile are of 72.5% and 76%. In both tests ages, with the increase of the depth of the layer occurs: decrease in the intruded volume total mercury, decrease in the tenor of combined water for the reference concrete and increment in the concretes with additions, decrease in the intensity of pick of the hydroxide of calcium in the three mixtures, decrease in the intensity of pick of the hydrated silicate for the reference concrete and increment in the concretes with mineral additions. Analysis on scanning electron microscopy showed refinement in the size of the grains, larger compact and uniformity in the mixtures with additions |
publishDate |
2007 |
dc.date.accessioned.fl_str_mv |
2007-07-02 |
dc.date.available.fl_str_mv |
2007-07-02 |
dc.date.issued.fl_str_mv |
2007-03-08 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
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masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
BRIZOLA, Rodrigo Matzenbacher. Microstructure of covercrete concretes with high contents of slag and fly ash activated by portland cemente and hydrated lime. 2007. 179 f. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal de Santa Maria, Santa Maria, 2007. |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/7882 |
identifier_str_mv |
BRIZOLA, Rodrigo Matzenbacher. Microstructure of covercrete concretes with high contents of slag and fly ash activated by portland cemente and hydrated lime. 2007. 179 f. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal de Santa Maria, Santa Maria, 2007. |
url |
http://repositorio.ufsm.br/handle/1/7882 |
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Universidade Federal de Santa Maria |
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Programa de Pós-Graduação em Engenharia Civil |
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UFSM |
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Engenharia Civil |
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Universidade Federal de Santa Maria |
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