Service life of white concretes exposed to chlorides: the influence of the cement and the diffusion coefficient

The corrosion of reinforcement due the action of chloride ions (Cl-) is one of the most common damages in reinforced concrete structures, decreasing the durability of those structures. The durability may be numerically expressed by the service life and the solutions from the second Fick`s Law are no...

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Egile Nagusiak:	Rizzon, Ana Carina, Andrade, Jairo José de Oliveira
Formatua:	Online
Hizkuntza:	por
Argitaratua:	ANTAC - Associação Nacional de Tecnologia do Ambiente Construído 2008
Sarrera elektronikoa:	https://seer.ufrgs.br/ambienteconstruido/article/view/3751
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id	ojs-article-3751
record_format	ojs
spelling	ojs-article-37512008-04-28T18:38:38Z Service life of white concretes exposed to chlorides: the influence of the cement and the diffusion coefficient Vida útil de concretos brancos quando inseridos em ambiente com cloretos: a influência do cimento e do coeficiente de difusão Rizzon, Ana Carina Andrade, Jairo José de Oliveira Vida útil; Cimento Portland branco; Cloretos; Coeficiente de difusão The corrosion of reinforcement due the action of chloride ions (Cl-) is one of the most common damages in reinforced concrete structures, decreasing the durability of those structures. The durability may be numerically expressed by the service life and the solutions from the second Fick`s Law are normally used to obtain service life values. This paper presents the results of a study on the applicability of the error function solution using two cement types: CP B and CP IV. Concretes were produced with three w/c ratios (0,4; 0,5; 0,6), and submitted to compressive strength and the chloride ingress tests over a period of 6 months. The results showed that the compressive strength and the diffusion coefficient (D) were higher for CP B than for CP IV. The value of D decreased along the test period for both types of cement, resulting in an increase of the estimated concrete service life. As the error function solution does not consider the variation of the parameter D, it does not adequately represent the transformations that happen in concrete structures over time, and the estimated service life does not correspond to the real one. A corrosão de armaduras devido à ação dos íons cloreto (Cl-) é um dos principais problemas que ocorrem nas estruturas de concreto armado, diminuindo a durabilidade dessas estruturas. A durabilidade pode ser expressa numericamente pela vida útil, e as soluções da 2ª Lei de Fick são bastante utilizadas para esse propósito. Neste trabalho realizou-se um estudo da aplicabilidade da solução da função de erro em concretos moldados com um CP B e um CP IV. Foram produzidos concretos a partir de três relações a/c (0,4; 0,5; 0,6), submetidos aos ensaios de resistência à compressão e de penetração de cloretos, com duração de 6 meses. Os concretos de CP B apresentaram maiores valores de resistência à compressão que os concretos de CP IV, mas também maiores valores de coeficiente de difusão (D). Verificou-se a diminuição de D ao longo do período estudado para os dois tipos de cimento, o que resultou no aumento da vida útil de projeto dos concretos analisados. Como tal variação não é contemplada pela solução da função de erro, esta não representa adequadamente as transformações que ocorrem em uma estrutura com o decorrer do tempo, e a vida útil estimada não corresponde àquela que a estrutura virá a ter. ANTAC - Associação Nacional de Tecnologia do Ambiente Construído 2008-04-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://seer.ufrgs.br/ambienteconstruido/article/view/3751 Ambiente Construído; v. 7, n. 4 (2007); 21-34 Ambiente Construído; v. 7, n. 4 (2007); 21-34 Ambiente Construído; v. 7, n. 4 (2007); 21-34 1678-8621 1415-8876 por https://seer.ufrgs.br/ambienteconstruido/article/view/3751/2104 Direitos autorais 2016 Ambiente Construído https://creativecommons.org/licenses/by/4.0
institution	Universidade Federal do Rio Grande do Sul
collection	OJS
language	por
format	Online
author	Rizzon, Ana Carina Andrade, Jairo José de Oliveira
spellingShingle	Rizzon, Ana Carina Andrade, Jairo José de Oliveira Service life of white concretes exposed to chlorides: the influence of the cement and the diffusion coefficient
author_facet	Rizzon, Ana Carina Andrade, Jairo José de Oliveira
author_sort	Rizzon, Ana Carina
title	Service life of white concretes exposed to chlorides: the influence of the cement and the diffusion coefficient
title_short	Service life of white concretes exposed to chlorides: the influence of the cement and the diffusion coefficient
title_full	Service life of white concretes exposed to chlorides: the influence of the cement and the diffusion coefficient
title_fullStr	Service life of white concretes exposed to chlorides: the influence of the cement and the diffusion coefficient
title_full_unstemmed	Service life of white concretes exposed to chlorides: the influence of the cement and the diffusion coefficient
title_sort	service life of white concretes exposed to chlorides: the influence of the cement and the diffusion coefficient
description	The corrosion of reinforcement due the action of chloride ions (Cl-) is one of the most common damages in reinforced concrete structures, decreasing the durability of those structures. The durability may be numerically expressed by the service life and the solutions from the second Fick`s Law are normally used to obtain service life values. This paper presents the results of a study on the applicability of the error function solution using two cement types: CP B and CP IV. Concretes were produced with three w/c ratios (0,4; 0,5; 0,6), and submitted to compressive strength and the chloride ingress tests over a period of 6 months. The results showed that the compressive strength and the diffusion coefficient (D) were higher for CP B than for CP IV. The value of D decreased along the test period for both types of cement, resulting in an increase of the estimated concrete service life. As the error function solution does not consider the variation of the parameter D, it does not adequately represent the transformations that happen in concrete structures over time, and the estimated service life does not correspond to the real one.
publisher	ANTAC - Associação Nacional de Tecnologia do Ambiente Construído
publishDate	2008
url	https://seer.ufrgs.br/ambienteconstruido/article/view/3751
work_keys_str_mv	AT rizzonanacarina servicelifeofwhiteconcretesexposedtochloridestheinfluenceofthecementandthediffusioncoefficient AT andradejairojosedeoliveira servicelifeofwhiteconcretesexposedtochloridestheinfluenceofthecementandthediffusioncoefficient AT rizzonanacarina vidautildeconcretosbrancosquandoinseridosemambientecomcloretosainfluenciadocimentoedocoeficientededifusao AT andradejairojosedeoliveira vidautildeconcretosbrancosquandoinseridosemambientecomcloretosainfluenciadocimentoedocoeficientededifusao
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Service life of white concretes exposed to chlorides: the influence of the cement and the diffusion coefficient

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