Penetração de cloretos em concretos compostos com cimento Portland branco e escória de alto forno, ativados quimicamente
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional Manancial UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/7690 |
Resumo: | The consumption of white Portland cement (WPC), in structural concretes, has been growing lately. Thus, targeting diffuse its use, and confirm its quality and durability as structural cement, this work has the aimed to investigate the effect of concretes compounds with WPC, slag and chemical activator (Na2SO4), on its behavior against chloride ion penetration. Besides reference mixture (100% WPC), were analyzed blends containing slag replacements of 50% and 70%. A content of activator was 4% of the binder, in which, 50% were slag. The water/binder (w/b) ratios were 0.30, 0.42 and 0.55, and submitted at ages of cure 3, 7, 28 and 91 days. For analysis of chloride penetration, were evaluated the penetration coefficient (by the immersion test, in chloride solution) and the total charge passed (according ASTM C1202/05). Essays of Compressive strength, mercury intrusion porosimetry and composition of pore solution, also been made. Results showed that replacements of WPC by slag provide excellent performance in chloride penetration tests, in all ages tested, manly, in higher w/b ratios. In spite of, the compressive strength of slag concretes not have been greater than reference mixture, this type of concrete attained good results, excepted for essay with three days. Chemical activator efficiency, to accelerate the improvement of slag concrete properties, at initial ages, were verified. Its efficacy was greater as higher w/b ratio and visible until cure of 28 days. The slag addition was beneficial also for de cost, present best results in uniformity of compressive strength and penetration coefficient. Correlations between immersion test and ASTM s essay, analyzed together other tests, show that results of test described by ASTM C1202/05 aren t trustful for practical in concretes with slag additions. |
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2008-04-072008-04-072008-02-12SIQUEIRA, Henrique Carvalho. Chloride ion penetration in concretes with white Portland cement and blast furnace slag, chemically activated. 2008. 141 f. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal de Santa Maria, Santa Maria, 2008.http://repositorio.ufsm.br/handle/1/7690The consumption of white Portland cement (WPC), in structural concretes, has been growing lately. Thus, targeting diffuse its use, and confirm its quality and durability as structural cement, this work has the aimed to investigate the effect of concretes compounds with WPC, slag and chemical activator (Na2SO4), on its behavior against chloride ion penetration. Besides reference mixture (100% WPC), were analyzed blends containing slag replacements of 50% and 70%. A content of activator was 4% of the binder, in which, 50% were slag. The water/binder (w/b) ratios were 0.30, 0.42 and 0.55, and submitted at ages of cure 3, 7, 28 and 91 days. For analysis of chloride penetration, were evaluated the penetration coefficient (by the immersion test, in chloride solution) and the total charge passed (according ASTM C1202/05). Essays of Compressive strength, mercury intrusion porosimetry and composition of pore solution, also been made. Results showed that replacements of WPC by slag provide excellent performance in chloride penetration tests, in all ages tested, manly, in higher w/b ratios. In spite of, the compressive strength of slag concretes not have been greater than reference mixture, this type of concrete attained good results, excepted for essay with three days. Chemical activator efficiency, to accelerate the improvement of slag concrete properties, at initial ages, were verified. Its efficacy was greater as higher w/b ratio and visible until cure of 28 days. The slag addition was beneficial also for de cost, present best results in uniformity of compressive strength and penetration coefficient. Correlations between immersion test and ASTM s essay, analyzed together other tests, show that results of test described by ASTM C1202/05 aren t trustful for practical in concretes with slag additions.O consumo do cimento Portland branco (CPB), para uso em concretos estruturais, vem aumentando consideravelmente nos últimos anos. Em vista disso, buscando difundir cada vez mais o seu uso e comprovar sua qualidade e durabilidade como cimento estrutural, este trabalho tem por objetivo investigar o comportamento, frente à ação dos íons cloreto, de concretos compostos por CPB e escória de alto forno, com e sem o uso de ativador químico (Na2SO4). Foram analisadas, além da mistura de referência (100% CPB), misturas contendo substituições parciais de CPB por teores de 50% e 70% de escória. A utilização do ativador foi realizada num teor de 4% do total de aglomerante, e este, com teor de 50% de escória. Cada mistura foi composta por relações água/aglomerante (a/ag) de 0,30; 0,42 e 0,55; e submetidas à prazos de cura de 3, 7, 28 e 91 dias. Para analisar a penetração de íons cloretos, foram avaliados os coeficientes de penetração (pelo ensaio de imersão em solução salina), e as cargas passantes (segundo a ASTM C1202/05). Além destes, foram realizados os ensaios de resistência à compressão axial, porosimetria por intrusão de mercúrio e composição da solução dos poros. Os resultados indicaram que a utilização parcial da escória proporciona desempenhos excelentes quanto à penetração dos íons cloretos em todos os prazos de cura estudados e, principalmente, nas misturas de maiores relações a/ag. Quanto a resistência à compressão, apesar de não propiciar resistências equivalentes aos concretos de referência, as misturas com escória apresentaram, exceto aos três dias, bons resultados. Foi comprovada a eficiência do ativador químico para a finalidade de acelerar o aprimoramento das resistências à compressão e penetração de cloretos, nas idades iniciais. Sua utilização mostrou ser mais eficiente, nas misturas com maiores relações a/ag e até prazos de cura de 28 dias. Em relação ao custo, a escória foi altamente benéfica, apresentando os melhores resultados em igualdade de resistência e coeficiente de penetração de cloretos. As correlações entre os ensaios de cloretos, acelerado e de imersão, analisados em conjunto com os demais ensaios realizados, permitem afirmar que os resultados do ensaio descrito pela ASTM C1202/05 não são confiáveis para concretos com adição de escória.Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorapplication/pdfporUniversidade Federal de Santa MariaPrograma de Pós-Graduação em Engenharia CivilUFSMBREngenharia CivilConcretoCimento Portland brancoEscóriaAtivador químicoÍons cloretoCNPQ::ENGENHARIAS::ENGENHARIA CIVILPenetração de cloretos em concretos compostos com cimento Portland branco e escória de alto forno, ativados quimicamenteChloride ion penetration in concretes with white Portland cement and blast furnace slag, chemically activatedinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisGastaldini, Antonio Luiz Guerrahttp://lattes.cnpq.br/9293085240832049Cervo, Tatiana Cureauhttp://lattes.cnpq.br/8942097635550980Guimarães, André Tavares da Cunhahttp://lattes.cnpq.br/8091918519299243http://lattes.cnpq.br/6796930919593381Siqueira, Henrique Carvalho3001000000034003003003003006a6bd4d6-e9f2-46f6-9245-5aefb19c7a28e06e8509-cdad-47fc-afdd-3f61eaed207305e1fbb9-96a8-4d37-a468-44e3ad60f72fb83053cc-a1df-46ca-906b-d03802bcbabeinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional Manancial UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALHENRIQUESIQUEIRA.pdfapplication/pdf1132013http://repositorio.ufsm.br/bitstream/1/7690/1/HENRIQUESIQUEIRA.pdfad4a3821ca9e38ff3aa4d1250feea334MD51TEXTHENRIQUESIQUEIRA.pdf.txtHENRIQUESIQUEIRA.pdf.txtExtracted texttext/plain255100http://repositorio.ufsm.br/bitstream/1/7690/2/HENRIQUESIQUEIRA.pdf.txte2967c66680bfc2c481ab975a359862cMD52THUMBNAILHENRIQUESIQUEIRA.pdf.jpgHENRIQUESIQUEIRA.pdf.jpgIM Thumbnailimage/jpeg4721http://repositorio.ufsm.br/bitstream/1/7690/3/HENRIQUESIQUEIRA.pdf.jpgdec7e0180e5eee28da4e48bd102ea068MD531/76902022-09-13 08:57:49.878oai:repositorio.ufsm.br:1/7690Repositório Institucionalhttp://repositorio.ufsm.br/PUBhttp://repositorio.ufsm.br/oai/requestouvidoria@ufsm.bropendoar:39132022-09-13T11:57:49Repositório Institucional Manancial UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.por.fl_str_mv |
Penetração de cloretos em concretos compostos com cimento Portland branco e escória de alto forno, ativados quimicamente |
dc.title.alternative.eng.fl_str_mv |
Chloride ion penetration in concretes with white Portland cement and blast furnace slag, chemically activated |
title |
Penetração de cloretos em concretos compostos com cimento Portland branco e escória de alto forno, ativados quimicamente |
spellingShingle |
Penetração de cloretos em concretos compostos com cimento Portland branco e escória de alto forno, ativados quimicamente Siqueira, Henrique Carvalho Concreto Cimento Portland branco Escória Ativador químico Íons cloreto CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
title_short |
Penetração de cloretos em concretos compostos com cimento Portland branco e escória de alto forno, ativados quimicamente |
title_full |
Penetração de cloretos em concretos compostos com cimento Portland branco e escória de alto forno, ativados quimicamente |
title_fullStr |
Penetração de cloretos em concretos compostos com cimento Portland branco e escória de alto forno, ativados quimicamente |
title_full_unstemmed |
Penetração de cloretos em concretos compostos com cimento Portland branco e escória de alto forno, ativados quimicamente |
title_sort |
Penetração de cloretos em concretos compostos com cimento Portland branco e escória de alto forno, ativados quimicamente |
author |
Siqueira, Henrique Carvalho |
author_facet |
Siqueira, Henrique Carvalho |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Gastaldini, Antonio Luiz Guerra |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/9293085240832049 |
dc.contributor.referee1.fl_str_mv |
Cervo, Tatiana Cureau |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/8942097635550980 |
dc.contributor.referee2.fl_str_mv |
Guimarães, André Tavares da Cunha |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/8091918519299243 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/6796930919593381 |
dc.contributor.author.fl_str_mv |
Siqueira, Henrique Carvalho |
contributor_str_mv |
Gastaldini, Antonio Luiz Guerra Cervo, Tatiana Cureau Guimarães, André Tavares da Cunha |
dc.subject.por.fl_str_mv |
Concreto Cimento Portland branco Escória Ativador químico Íons cloreto |
topic |
Concreto Cimento Portland branco Escória Ativador químico Íons cloreto CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
dc.subject.cnpq.fl_str_mv |
CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
description |
The consumption of white Portland cement (WPC), in structural concretes, has been growing lately. Thus, targeting diffuse its use, and confirm its quality and durability as structural cement, this work has the aimed to investigate the effect of concretes compounds with WPC, slag and chemical activator (Na2SO4), on its behavior against chloride ion penetration. Besides reference mixture (100% WPC), were analyzed blends containing slag replacements of 50% and 70%. A content of activator was 4% of the binder, in which, 50% were slag. The water/binder (w/b) ratios were 0.30, 0.42 and 0.55, and submitted at ages of cure 3, 7, 28 and 91 days. For analysis of chloride penetration, were evaluated the penetration coefficient (by the immersion test, in chloride solution) and the total charge passed (according ASTM C1202/05). Essays of Compressive strength, mercury intrusion porosimetry and composition of pore solution, also been made. Results showed that replacements of WPC by slag provide excellent performance in chloride penetration tests, in all ages tested, manly, in higher w/b ratios. In spite of, the compressive strength of slag concretes not have been greater than reference mixture, this type of concrete attained good results, excepted for essay with three days. Chemical activator efficiency, to accelerate the improvement of slag concrete properties, at initial ages, were verified. Its efficacy was greater as higher w/b ratio and visible until cure of 28 days. The slag addition was beneficial also for de cost, present best results in uniformity of compressive strength and penetration coefficient. Correlations between immersion test and ASTM s essay, analyzed together other tests, show that results of test described by ASTM C1202/05 aren t trustful for practical in concretes with slag additions. |
publishDate |
2008 |
dc.date.accessioned.fl_str_mv |
2008-04-07 |
dc.date.available.fl_str_mv |
2008-04-07 |
dc.date.issued.fl_str_mv |
2008-02-12 |
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info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/masterThesis |
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dc.identifier.citation.fl_str_mv |
SIQUEIRA, Henrique Carvalho. Chloride ion penetration in concretes with white Portland cement and blast furnace slag, chemically activated. 2008. 141 f. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal de Santa Maria, Santa Maria, 2008. |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/7690 |
identifier_str_mv |
SIQUEIRA, Henrique Carvalho. Chloride ion penetration in concretes with white Portland cement and blast furnace slag, chemically activated. 2008. 141 f. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal de Santa Maria, Santa Maria, 2008. |
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http://repositorio.ufsm.br/handle/1/7690 |
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