Avaliação da capacidade de proteção contra a corrosão da arma-dura induzida por cloretos de concretos com adições minerais e inibidores de corrosão
Autor(a) principal: | |
---|---|
Data de Publicação: | 2009 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFG |
Texto Completo: | http://repositorio.bc.ufg.br/tede/handle/tde/1347 |
Resumo: | Increasing the durability of concrete structural elements is primordial, especially those related to power generation in eolic areas that are subjected to the phenomenon of reinforcement corrosion. In this context, this study aims to evaluate the overall protection ability of concrete to the phenomenon of reinforcement corrosion induced by chlorides. To this end, it was adopted a statistical program based on a fractional factorial design in which the variables studied were as follows: the water-binder ratio (0.35, 0.45 and 0.55), the type of mineral admixture (silica fume and blast furnace slag at specific levels), the type of corrosion inhibitor (calcium nitrite, sodium nitrite and amine) and the level of corrosion inhibitor (minimum and maximum recommended by each manufacturer). In the concrete investigations, the tests performed were corrosion potential, polarization resistance and electrochemical impedance. Throughout the experiments, it was possible to testify the beneficial effect of reducing the water-binder ratio. It was also possible to prove the very positive effect of the incorporation of mineral admixtures, especially of silica fume. The satisfactory performance of various inhibitors evaluated was also verified, specially when concrete contains mineral admixtures. A parallel study was conducted to make a comparative analysis of inhibitors at the same range of concentrations (at solid levels of 0.76%, 2.21% and 3.66% of the compound on the cement mass), nevertheless this study have demonstrated that fixing contents for all inhibitor is not appropriated, and the recommended dosages by the manufacturer is the best condition. As the levels recommended by manufacturers, it was found that the higher percentages have not worked well for sodium nitrite otherwise, for amine and nitrite calcium, the higher levels implied better results. Regarding the tannin inhibitor also assessed in the parallel study mentioned above (related to specific inhibitors), its good performance related to corrosion inhibition happened just for the content of 0.76% (the lowest levels). For the other contents, it was verified anomalous results. These results demonstrated that each type of corrosion inhibitor has its optimal concentration for use in concrete. Based on a cost-benefit analysis and evaluating the increase in the concrete value for cubic meter (in R$) in the presence of inhibitors at the same contents, it was verified a relative parity prices among the tested nitrites and an extremely high cost of amine. However, when performing the same analysis but using the levels recommended by the manufacturers for each inhibitor independent, it was found that the large disparity in prices between nitrite and amine was reduced considerably. An assessment of technical and economic feasibility was also performed based on the efficiency of corrosion inhibition and cost per cubic meter of concrete mixtures that did not show a typical depassivation of their stell bar up to the attack age evaluated |
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CASCUDO, Oswaldohttp://lattes.cnpq.br/3336749062812376HASPARYK, Nicole Paganhttp://lattes.cnpq.br/4932240949129648http://lattes.cnpq.br/2143503324154865LIMA, Marcelo Batista2014-07-29T15:18:24Z2009-12-152009-09-28LIMA, Marcelo Batista. Evaluation of the ability to protect against corrosion of the gun hard-induced chloride concrete with mineral additions and corrosion inhibitors. 2009. 219 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Goiás, Goiânia, 2009.http://repositorio.bc.ufg.br/tede/handle/tde/1347Increasing the durability of concrete structural elements is primordial, especially those related to power generation in eolic areas that are subjected to the phenomenon of reinforcement corrosion. In this context, this study aims to evaluate the overall protection ability of concrete to the phenomenon of reinforcement corrosion induced by chlorides. To this end, it was adopted a statistical program based on a fractional factorial design in which the variables studied were as follows: the water-binder ratio (0.35, 0.45 and 0.55), the type of mineral admixture (silica fume and blast furnace slag at specific levels), the type of corrosion inhibitor (calcium nitrite, sodium nitrite and amine) and the level of corrosion inhibitor (minimum and maximum recommended by each manufacturer). In the concrete investigations, the tests performed were corrosion potential, polarization resistance and electrochemical impedance. Throughout the experiments, it was possible to testify the beneficial effect of reducing the water-binder ratio. It was also possible to prove the very positive effect of the incorporation of mineral admixtures, especially of silica fume. The satisfactory performance of various inhibitors evaluated was also verified, specially when concrete contains mineral admixtures. A parallel study was conducted to make a comparative analysis of inhibitors at the same range of concentrations (at solid levels of 0.76%, 2.21% and 3.66% of the compound on the cement mass), nevertheless this study have demonstrated that fixing contents for all inhibitor is not appropriated, and the recommended dosages by the manufacturer is the best condition. As the levels recommended by manufacturers, it was found that the higher percentages have not worked well for sodium nitrite otherwise, for amine and nitrite calcium, the higher levels implied better results. Regarding the tannin inhibitor also assessed in the parallel study mentioned above (related to specific inhibitors), its good performance related to corrosion inhibition happened just for the content of 0.76% (the lowest levels). For the other contents, it was verified anomalous results. These results demonstrated that each type of corrosion inhibitor has its optimal concentration for use in concrete. Based on a cost-benefit analysis and evaluating the increase in the concrete value for cubic meter (in R$) in the presence of inhibitors at the same contents, it was verified a relative parity prices among the tested nitrites and an extremely high cost of amine. However, when performing the same analysis but using the levels recommended by the manufacturers for each inhibitor independent, it was found that the large disparity in prices between nitrite and amine was reduced considerably. An assessment of technical and economic feasibility was also performed based on the efficiency of corrosion inhibition and cost per cubic meter of concrete mixtures that did not show a typical depassivation of their stell bar up to the attack age evaluatedO aumento da durabilidade é um aspecto primordial para os elementos estruturais de concreto, em especial aqueles constituintes das estruturas de geração de energia em parques eólicos, sujeitos ao fenômeno de corrosão das armaduras. Nesse contexto, este trabalho tem como objetivo geral avaliar a capacidade de proteção de diferentes concretoS frente ao fenômeno da corrosão da armadura induzida por cloretos. Para tanto, foi adotado um planejamento estatístico baseado em um modelo fatorial fracionado em que as variáveis estudadas foram: a relação água/aglomerante (0,35; 0,45 e 0,55), o tipo de adição mineral (sílica ativa e escória de alto-forno, em teores específicos), o tipo de inibidor de corrosão (nitrito de cálcio, nitrito de sódio e amina) e o teor de inibidor de corrosão (mínimo e máximo recomendado por cada fabricante). Na avaliação dos concretos, foram realizados ensaios de potencial de corrosão, resistência de polarização e impedância eletroquímica. Ao longo de todo experimento foi possível constatar o efeito benéfico da redução da relação a/agl. Também foi possível verificar o efeito extremamente positivo da incorporação das adições minerais, em especial da sílica ativa. Constatou-se também o efeito positivo dos diversos inibidores avaliados, em seus teores mínimo e máximo, beneficio que se mostrou mais pronunciado quando da utilização conjunta com as adições minerais. Um estudo paralelo foi realizado para se fazer uma análise comparativa dos inibidores dentro da mesma faixa de teores empregados (teores de 0,76%; 2,21% e 3,66% de sólidos do aditivo em relação à massa de cimento), no qual se verificou que a utilização desses teores fixos para os diferentes tipos de inibidores não se mostrou tão eficiente quanto em relação à utilização dos aditivos na dosagem de recomendação do fabricante. Quanto a estes teores (recomendados pelos fabricantes), verificou-se que os percentuais mais altos não funcionaram bem para o nitrito de sódio, ao passo que para a amina e para o nitrito de cálcio os teores mais elevados resultaram em melhores resultados. Em relação ao tanino, inibidor que também foi avaliado no estudo paralelo referido anteriormente (específico sobre os inibidores), só houve algum resultado de inibição de corrosão para o teor de 0,76% (mais baixo dos teores), tendo-se obtido resultados anômalos para os outros 2 teores mais altos. Tais resultados permitiram constatar que cada tipo de inibidor de corrosão possui sua concentração ótima de utilização no concreto. Fazendo-se uma análise de custo e avaliando-se o acréscimo em Reais no valor do m3 do concreto proporcionado pelos diversos aditivos inibidores e nos teores de mesma faixa de emprego, verificou-se uma relativa paridade de preços entre os nitritos e um elevadíssimo custo da amina. No entanto, ao se realizar a mesma análise, mas utilizando os teores recomendados pelos fabricantes de cada inibidor, verificou-se que a grande disparidade de preços entre os nitritos e a amina foi reduzida de forma considerável. Uma avaliação da viabilidade técnico-econômica dos concretos também foi realizada, a partir dos dados de eficiência de inibição à corrosão e custo/m3 das misturas que não apresentaram comportamento típico de despassivação de suas armaduras até a idade de ataque consideradaMade available in DSpace on 2014-07-29T15:18:24Z (GMT). No. of bitstreams: 1 pretextual.pdf: 140883 bytes, checksum: 5d9ee4b9b3884a0032825e604304580f (MD5) Previous issue date: 2009-09-28application/pdfhttp://repositorio.bc.ufg.br/TEDE/retrieve/4198/pretextual.pdf.jpgporUniversidade Federal de GoiásMestrado em Geotecnia e Construção CivilUFGBREngenhariasConcretoAdições mineraisSílica ativaEscória de alto-fornoInibidores de corrosãoCorrosão da armaduraTécnicas eletroquímicasConcreteMineral admixtureSilica fumeBlast furnace slagCorrosion InhibitorsSteel corrosionElectrochemical techniquesCNPQ::ENGENHARIAS::ENGENHARIA CIVIL::GEOTECNICAAvaliação da capacidade de proteção contra a corrosão da arma-dura induzida por cloretos de concretos com adições minerais e inibidores de corrosãoEvaluation of the ability to protect against corrosion of the gun hard-induced chloride concrete with mineral additions and corrosion inhibitorsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFGinstname:Universidade Federal de Goiás (UFG)instacron:UFGORIGINALpretextual.pdfapplication/pdf140883http://repositorio.bc.ufg.br/tede/bitstreams/f7e312c4-b227-4e7d-b309-857e44fdb54d/download5d9ee4b9b3884a0032825e604304580fMD51THUMBNAILpretextual.pdf.jpgpretextual.pdf.jpgGenerated Thumbnailimage/jpeg1943http://repositorio.bc.ufg.br/tede/bitstreams/2dc73bf0-1c80-4cf3-b961-f2b265b93e6f/downloadcc73c4c239a4c332d642ba1e7c7a9fb2MD52tde/13472014-07-30 03:12:13.241open.accessoai:repositorio.bc.ufg.br:tde/1347http://repositorio.bc.ufg.br/tedeRepositório InstitucionalPUBhttp://repositorio.bc.ufg.br/oai/requesttasesdissertacoes.bc@ufg.bropendoar:2014-07-30T06:12:13Repositório Institucional da UFG - Universidade Federal de Goiás (UFG)false |
dc.title.por.fl_str_mv |
Avaliação da capacidade de proteção contra a corrosão da arma-dura induzida por cloretos de concretos com adições minerais e inibidores de corrosão |
dc.title.alternative.eng.fl_str_mv |
Evaluation of the ability to protect against corrosion of the gun hard-induced chloride concrete with mineral additions and corrosion inhibitors |
title |
Avaliação da capacidade de proteção contra a corrosão da arma-dura induzida por cloretos de concretos com adições minerais e inibidores de corrosão |
spellingShingle |
Avaliação da capacidade de proteção contra a corrosão da arma-dura induzida por cloretos de concretos com adições minerais e inibidores de corrosão LIMA, Marcelo Batista Concreto Adições minerais Sílica ativa Escória de alto-forno Inibidores de corrosão Corrosão da armadura Técnicas eletroquímicas Concrete Mineral admixture Silica fume Blast furnace slag Corrosion Inhibitors Steel corrosion Electrochemical techniques CNPQ::ENGENHARIAS::ENGENHARIA CIVIL::GEOTECNICA |
title_short |
Avaliação da capacidade de proteção contra a corrosão da arma-dura induzida por cloretos de concretos com adições minerais e inibidores de corrosão |
title_full |
Avaliação da capacidade de proteção contra a corrosão da arma-dura induzida por cloretos de concretos com adições minerais e inibidores de corrosão |
title_fullStr |
Avaliação da capacidade de proteção contra a corrosão da arma-dura induzida por cloretos de concretos com adições minerais e inibidores de corrosão |
title_full_unstemmed |
Avaliação da capacidade de proteção contra a corrosão da arma-dura induzida por cloretos de concretos com adições minerais e inibidores de corrosão |
title_sort |
Avaliação da capacidade de proteção contra a corrosão da arma-dura induzida por cloretos de concretos com adições minerais e inibidores de corrosão |
author |
LIMA, Marcelo Batista |
author_facet |
LIMA, Marcelo Batista |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
CASCUDO, Oswaldo |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/3336749062812376 |
dc.contributor.advisor-co1.fl_str_mv |
HASPARYK, Nicole Pagan |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/4932240949129648 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/2143503324154865 |
dc.contributor.author.fl_str_mv |
LIMA, Marcelo Batista |
contributor_str_mv |
CASCUDO, Oswaldo HASPARYK, Nicole Pagan |
dc.subject.por.fl_str_mv |
Concreto Adições minerais Sílica ativa Escória de alto-forno Inibidores de corrosão Corrosão da armadura Técnicas eletroquímicas |
topic |
Concreto Adições minerais Sílica ativa Escória de alto-forno Inibidores de corrosão Corrosão da armadura Técnicas eletroquímicas Concrete Mineral admixture Silica fume Blast furnace slag Corrosion Inhibitors Steel corrosion Electrochemical techniques CNPQ::ENGENHARIAS::ENGENHARIA CIVIL::GEOTECNICA |
dc.subject.eng.fl_str_mv |
Concrete Mineral admixture Silica fume Blast furnace slag Corrosion Inhibitors Steel corrosion Electrochemical techniques |
dc.subject.cnpq.fl_str_mv |
CNPQ::ENGENHARIAS::ENGENHARIA CIVIL::GEOTECNICA |
description |
Increasing the durability of concrete structural elements is primordial, especially those related to power generation in eolic areas that are subjected to the phenomenon of reinforcement corrosion. In this context, this study aims to evaluate the overall protection ability of concrete to the phenomenon of reinforcement corrosion induced by chlorides. To this end, it was adopted a statistical program based on a fractional factorial design in which the variables studied were as follows: the water-binder ratio (0.35, 0.45 and 0.55), the type of mineral admixture (silica fume and blast furnace slag at specific levels), the type of corrosion inhibitor (calcium nitrite, sodium nitrite and amine) and the level of corrosion inhibitor (minimum and maximum recommended by each manufacturer). In the concrete investigations, the tests performed were corrosion potential, polarization resistance and electrochemical impedance. Throughout the experiments, it was possible to testify the beneficial effect of reducing the water-binder ratio. It was also possible to prove the very positive effect of the incorporation of mineral admixtures, especially of silica fume. The satisfactory performance of various inhibitors evaluated was also verified, specially when concrete contains mineral admixtures. A parallel study was conducted to make a comparative analysis of inhibitors at the same range of concentrations (at solid levels of 0.76%, 2.21% and 3.66% of the compound on the cement mass), nevertheless this study have demonstrated that fixing contents for all inhibitor is not appropriated, and the recommended dosages by the manufacturer is the best condition. As the levels recommended by manufacturers, it was found that the higher percentages have not worked well for sodium nitrite otherwise, for amine and nitrite calcium, the higher levels implied better results. Regarding the tannin inhibitor also assessed in the parallel study mentioned above (related to specific inhibitors), its good performance related to corrosion inhibition happened just for the content of 0.76% (the lowest levels). For the other contents, it was verified anomalous results. These results demonstrated that each type of corrosion inhibitor has its optimal concentration for use in concrete. Based on a cost-benefit analysis and evaluating the increase in the concrete value for cubic meter (in R$) in the presence of inhibitors at the same contents, it was verified a relative parity prices among the tested nitrites and an extremely high cost of amine. However, when performing the same analysis but using the levels recommended by the manufacturers for each inhibitor independent, it was found that the large disparity in prices between nitrite and amine was reduced considerably. An assessment of technical and economic feasibility was also performed based on the efficiency of corrosion inhibition and cost per cubic meter of concrete mixtures that did not show a typical depassivation of their stell bar up to the attack age evaluated |
publishDate |
2009 |
dc.date.available.fl_str_mv |
2009-12-15 |
dc.date.issued.fl_str_mv |
2009-09-28 |
dc.date.accessioned.fl_str_mv |
2014-07-29T15:18:24Z |
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 |
LIMA, Marcelo Batista. Evaluation of the ability to protect against corrosion of the gun hard-induced chloride concrete with mineral additions and corrosion inhibitors. 2009. 219 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Goiás, Goiânia, 2009. |
dc.identifier.uri.fl_str_mv |
http://repositorio.bc.ufg.br/tede/handle/tde/1347 |
identifier_str_mv |
LIMA, Marcelo Batista. Evaluation of the ability to protect against corrosion of the gun hard-induced chloride concrete with mineral additions and corrosion inhibitors. 2009. 219 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Goiás, Goiânia, 2009. |
url |
http://repositorio.bc.ufg.br/tede/handle/tde/1347 |
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por |
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Universidade Federal de Goiás |
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Mestrado em Geotecnia e Construção Civil |
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UFG |
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BR |
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Engenharias |
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Universidade Federal de Goiás |
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