Carbonatação em concreto com cinza de casca de arroz sem moagem
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Manancial - Repositório Digital da UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/7704 |
Resumo: | This research is part of a project that aimed to evaluate the technical viability of the use of unground (in natura) residual Rice Husk Ash (RHA), without grinding, for structural concrete. The present work investigated the evaluation of the depth and the determination of the carbonation coefficients for concrete with the addition of 15% and 25% residual RHA in replacement of cement CP II F-32 (values in mass) ground in mill of balls and unground, and compared with the reference concrete with three water/cimenticious materials ratios: 0.45, 0.55 and 0.65. This work aimed more specifically to analyze the influence of the type and the level of residual RHA incorporated to the concrete on the carbonation process. Accelerated carbonation, mercury intrusion porosimetry and remaining calcium hydroxide level were investigated. For comparison, axial compression strength tests were carried out. The accelerated carbonation tests were performed after a period of 3, 6, 9 and 12 weeks of exhibition to CO2 in climatic chamber. Porosimetry, remaining calcium hydroxide, and axial compression strength tests were performed on 91 days. The results showed that the carbonation coefficients of the ground residual RHA sample were lower than the values presented by the unground (in natura) residual RHA, in both replacement levels and in all water/cimenticious materials ratios. The lowest carbonation coefficient values were related to the reference concrete. Concerning mercury intrusion porosimetry, the incorporation of RHA caused a refinement of the concrete pores when compared to the reference in the three water/cimenticious materials ratios used. On the other hand, the effect of the lowest alkaline reservation of the concretes containing the incorporation of residual RHA prevailed on the effect of the permeability reduction of the concretes caused by the addition of RHA. Therefore, the use of residual RHA to the structural concrete in levels of 15% of incorporation to ground and in natura samples in the water/cimenticious materials ratios 0.45, 0.55 and 0.65; in levels of 25% of replacement for the in natura sample of water/cimenticious material ratios 0.45, as well as the ground sample with water/materials cimenticious ratios 0.45 and 0.55, is an option when carbonation is the main variable of concrete durability. |
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Carbonatação em concreto com cinza de casca de arroz sem moagemConcrete carbonation with unground rice husk ashCarbonataçãoDurabilidadeCinza de casca de arroz naturalConcreto estruturalCarbonationDurabilityRice husk ash ungroundStructural concreteCNPQ::ENGENHARIAS::ENGENHARIA CIVILThis research is part of a project that aimed to evaluate the technical viability of the use of unground (in natura) residual Rice Husk Ash (RHA), without grinding, for structural concrete. The present work investigated the evaluation of the depth and the determination of the carbonation coefficients for concrete with the addition of 15% and 25% residual RHA in replacement of cement CP II F-32 (values in mass) ground in mill of balls and unground, and compared with the reference concrete with three water/cimenticious materials ratios: 0.45, 0.55 and 0.65. This work aimed more specifically to analyze the influence of the type and the level of residual RHA incorporated to the concrete on the carbonation process. Accelerated carbonation, mercury intrusion porosimetry and remaining calcium hydroxide level were investigated. For comparison, axial compression strength tests were carried out. The accelerated carbonation tests were performed after a period of 3, 6, 9 and 12 weeks of exhibition to CO2 in climatic chamber. Porosimetry, remaining calcium hydroxide, and axial compression strength tests were performed on 91 days. The results showed that the carbonation coefficients of the ground residual RHA sample were lower than the values presented by the unground (in natura) residual RHA, in both replacement levels and in all water/cimenticious materials ratios. The lowest carbonation coefficient values were related to the reference concrete. Concerning mercury intrusion porosimetry, the incorporation of RHA caused a refinement of the concrete pores when compared to the reference in the three water/cimenticious materials ratios used. On the other hand, the effect of the lowest alkaline reservation of the concretes containing the incorporation of residual RHA prevailed on the effect of the permeability reduction of the concretes caused by the addition of RHA. Therefore, the use of residual RHA to the structural concrete in levels of 15% of incorporation to ground and in natura samples in the water/cimenticious materials ratios 0.45, 0.55 and 0.65; in levels of 25% of replacement for the in natura sample of water/cimenticious material ratios 0.45, as well as the ground sample with water/materials cimenticious ratios 0.45 and 0.55, is an option when carbonation is the main variable of concrete durability.A pesquisa realizada faz parte de um projeto que tem por objetivo a avaliação da viabilidade técnica do emprego de CCA residual IN NATURA , sem moagem, em concretos para fins estruturais. A presente investigação trata da avaliação da profundidade e a determinação dos coeficientes de carbonatação para concretos com a adição de CCA residual com teores de 15% e 25% em substituição ao cimento CP II F-32 (valores em massa) moída em moinho de bolas e in natura , sendo esta sem moagem e comparados com o concreto de referência, com três relações a/ag 0,45, 0,55 e 0,65. Objetiva, mais especificamente, analisar a influência do tipo e do teor de CCA residual incorporado ao concreto, sobre o processo de carbonatação. Foram realizados ensaios de carbonatação acelerada, porosimetria por intrusão de mercúrio e teor de hidróxido de cálcio remanescente. Para efeito de comparação, também foram realizados ensaios de resistência à compressão axial. Os ensaios de carbonatação acelerada foram realizados após um período de 3, 6, 9 e 12 semanas de exposição ao CO2 em câmara climática. Os ensaios de porosimetria, hidróxido de cálcio remanescente e resistência à compressão foram realizados aos 91 dias. Os resultados indicam que os coeficientes de carbonatação da amostra com a adição de CCA residual moída foram inferiores aos valores apresentados pela amostra de CCA residual IN NATURA , em ambos os teores de substituição e em todas as relações a/ag. Os menores valores de coeficiente de carbonatação apresentados reportam-se ao concreto de referência. Analisando-se os resultados de porosimetria por intrusão de mercúrio, percebese que a incorporação de CCA acarreta um refinamento dos poros do concreto quando comparado ao referência, nas três relações a/ag empregadas. Por outro lado, nesta pesquisa, prepondera o efeito da menor reserva alcalina dos concretos contendo a incorporação de CCA residual sobre o efeito de redução da permeabilidade dos concretos ocasionada pela adição de CCA. Além disso, vislumbra-se a possibilidade do emprego de CCA residual ao concreto estrutural nos teores de 15% de incorporação de CCA residual tanto a amostra moída quanto in natura nas relações a/ag 0,45, 0,55 e 0,65 e para o teor de 25% de substituição para a amostra in natura de relação a/ag de 0,45 bem como a amostra moída com relação a/ag de 0,45 e 0,55, quando a principal variável de durabilidade do concreto é a carbonatação.Universidade Federal de Santa MariaBREngenharia CivilUFSMPrograma de Pós-Graduação em Engenharia CivilIsaia, Geraldo Cechellahttp://lattes.cnpq.br/8260652949733370Gastaldini, Antonio Luiz Guerrahttp://lattes.cnpq.br/9293085240832049Figueiredo, Enio José Pazinihttp://lattes.cnpq.br/4075543806767323Hoppe, Alessandro Eduardo2008-12-122008-12-122008-04-28info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfapplication/pdfHOPPE, Alessandro Eduardo. Concrete carbonation with unground rice husk ash. 2008. 148 f. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal de Santa Maria, Santa Maria, 2008.http://repositorio.ufsm.br/handle/1/7704porinfo:eu-repo/semantics/openAccessreponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM2022-03-15T19:48:46Zoai:repositorio.ufsm.br:1/7704Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2022-03-15T19:48:46Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
Carbonatação em concreto com cinza de casca de arroz sem moagem Concrete carbonation with unground rice husk ash |
title |
Carbonatação em concreto com cinza de casca de arroz sem moagem |
spellingShingle |
Carbonatação em concreto com cinza de casca de arroz sem moagem Hoppe, Alessandro Eduardo Carbonatação Durabilidade Cinza de casca de arroz natural Concreto estrutural Carbonation Durability Rice husk ash unground Structural concrete CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
title_short |
Carbonatação em concreto com cinza de casca de arroz sem moagem |
title_full |
Carbonatação em concreto com cinza de casca de arroz sem moagem |
title_fullStr |
Carbonatação em concreto com cinza de casca de arroz sem moagem |
title_full_unstemmed |
Carbonatação em concreto com cinza de casca de arroz sem moagem |
title_sort |
Carbonatação em concreto com cinza de casca de arroz sem moagem |
author |
Hoppe, Alessandro Eduardo |
author_facet |
Hoppe, Alessandro Eduardo |
author_role |
author |
dc.contributor.none.fl_str_mv |
Isaia, Geraldo Cechella http://lattes.cnpq.br/8260652949733370 Gastaldini, Antonio Luiz Guerra http://lattes.cnpq.br/9293085240832049 Figueiredo, Enio José Pazini http://lattes.cnpq.br/4075543806767323 |
dc.contributor.author.fl_str_mv |
Hoppe, Alessandro Eduardo |
dc.subject.por.fl_str_mv |
Carbonatação Durabilidade Cinza de casca de arroz natural Concreto estrutural Carbonation Durability Rice husk ash unground Structural concrete CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
topic |
Carbonatação Durabilidade Cinza de casca de arroz natural Concreto estrutural Carbonation Durability Rice husk ash unground Structural concrete CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
description |
This research is part of a project that aimed to evaluate the technical viability of the use of unground (in natura) residual Rice Husk Ash (RHA), without grinding, for structural concrete. The present work investigated the evaluation of the depth and the determination of the carbonation coefficients for concrete with the addition of 15% and 25% residual RHA in replacement of cement CP II F-32 (values in mass) ground in mill of balls and unground, and compared with the reference concrete with three water/cimenticious materials ratios: 0.45, 0.55 and 0.65. This work aimed more specifically to analyze the influence of the type and the level of residual RHA incorporated to the concrete on the carbonation process. Accelerated carbonation, mercury intrusion porosimetry and remaining calcium hydroxide level were investigated. For comparison, axial compression strength tests were carried out. The accelerated carbonation tests were performed after a period of 3, 6, 9 and 12 weeks of exhibition to CO2 in climatic chamber. Porosimetry, remaining calcium hydroxide, and axial compression strength tests were performed on 91 days. The results showed that the carbonation coefficients of the ground residual RHA sample were lower than the values presented by the unground (in natura) residual RHA, in both replacement levels and in all water/cimenticious materials ratios. The lowest carbonation coefficient values were related to the reference concrete. Concerning mercury intrusion porosimetry, the incorporation of RHA caused a refinement of the concrete pores when compared to the reference in the three water/cimenticious materials ratios used. On the other hand, the effect of the lowest alkaline reservation of the concretes containing the incorporation of residual RHA prevailed on the effect of the permeability reduction of the concretes caused by the addition of RHA. Therefore, the use of residual RHA to the structural concrete in levels of 15% of incorporation to ground and in natura samples in the water/cimenticious materials ratios 0.45, 0.55 and 0.65; in levels of 25% of replacement for the in natura sample of water/cimenticious material ratios 0.45, as well as the ground sample with water/materials cimenticious ratios 0.45 and 0.55, is an option when carbonation is the main variable of concrete durability. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-12-12 2008-12-12 2008-04-28 |
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.uri.fl_str_mv |
HOPPE, Alessandro Eduardo. Concrete carbonation with unground rice husk ash. 2008. 148 f. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal de Santa Maria, Santa Maria, 2008. http://repositorio.ufsm.br/handle/1/7704 |
identifier_str_mv |
HOPPE, Alessandro Eduardo. Concrete carbonation with unground rice husk ash. 2008. 148 f. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal de Santa Maria, Santa Maria, 2008. |
url |
http://repositorio.ufsm.br/handle/1/7704 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria BR Engenharia Civil UFSM Programa de Pós-Graduação em Engenharia Civil |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria BR Engenharia Civil UFSM Programa de Pós-Graduação em Engenharia Civil |
dc.source.none.fl_str_mv |
reponame:Manancial - Repositório Digital da UFSM instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
instname_str |
Universidade Federal de Santa Maria (UFSM) |
instacron_str |
UFSM |
institution |
UFSM |
reponame_str |
Manancial - Repositório Digital da UFSM |
collection |
Manancial - Repositório Digital da UFSM |
repository.name.fl_str_mv |
Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM) |
repository.mail.fl_str_mv |
atendimento.sib@ufsm.br||tedebc@gmail.com |
_version_ |
1805922177361379328 |