Influence of binder in the drying shrinkage of fiber cement

There has much interest in the fiber cement industry in improving binder composition in order to achieve better economic, technical and environmental results. In this context, cements with lower clinker content are an attractive alternative and have already been used by the industry. However, fiberc...

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Auteurs principaux:	Giordano, Brunoro Leite, Souza, Rui Barbosa de, John, Vanderley Moacyr
Format:	Online
Langue:	por
Publié:	ANTAC - Associação Nacional de Tecnologia do Ambiente Construído 2009
Accès en ligne:	https://seer.ufrgs.br/ambienteconstruido/article/view/9528
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id	ojs-article-9528
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spelling	ojs-article-95282010-02-03T15:44:40Z Influence of binder in the drying shrinkage of fiber cement Influência do ligante na retração por secagem em fibrocimento Giordano, Brunoro Leite Souza, Rui Barbosa de John, Vanderley Moacyr Filler calcário. Escória de alto forno. Retração por secagem. Composição química. There has much interest in the fiber cement industry in improving binder composition in order to achieve better economic, technical and environmental results. In this context, cements with lower clinker content are an attractive alternative and have already been used by the industry. However, fibercement sheets reinforced with organic fibers frequently present edge cracks resulting from drying the components in stockpiles. This study evaluates the impact of partially replacing clinker by blast furnace slag activated with sodium silicate on the mechanical properties, porosity, hydrated phases, and drying shrinkage of fiber cement reinforced with organic fibers. Samples were produced with commercial Brazilian CPII F-32 cement and also with a mixture of CPII F-32 with granulated blast furnace slag activated by sodium silicate. The results show that replacing clinker by slag activated by sodium silicates increases the amount of pores smaller than 0.003 ?m, due to an increase in the amount of CSH formed in hydration. Consequently, samples produced with CPII F-32 mixed with slag and sodium silicate present much higher drying shrinkage. Existe um grande interesse das indústrias de fibrocimento em buscar ligantes de composição ótima do ponto de vista econômico, técnico e ambiental. Neste sentido, cimentos onde parte do clínquer é substituída xiste um grande interesse das indústrias de fibrocimento em buscar ligantes de composição ótima do ponto de vista econômico, técnico e ambiental. Neste sentido, cimentos onde parte do clínquer é substituída por adições ativas são bastante atrativos e cimentos com baixos teores de adição já são utilizados pelo setor. Entretanto, chapas de fibrocimento reforçadas com fibras orgânicas têm apresentado freqüentemente fissuras nas bordas de telhas e painéis, que provém da secagem dos componentes nas pilhas de estocagem. Neste trabalho foi avaliado o impacto da introdução de escória e silicato de sódio na composição do ligante nas propriedades mecânicas, porosidade, compostos hidratados formados e principalmente na retração por secagem de fibrocimentos reforçados com fibras orgânicas. Foram produzidas placas de fibrocimento com cimento CPII F-32 e com uma mistura do CPII F-32 e escória granulada de alto forno ativada por silicato de sódio alcalino. Os resultados mostraram que há maior quantidade de poros menores que 0,003µm na amostra com escória e silicato de sódio, devido à maior quantidade de C-S-H formado na hidratação. Conseqüentemente, a incorporação de escória ativada com silicato de sódio como ligante do fibrocimento aumenta a retração por secagem deste compósito, aumentando conseqüentemente a tendência da fissuração dos artefatos. ANTAC - Associação Nacional de Tecnologia do Ambiente Construído FAPESP, FINEP, CNPq 2009-12-19 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://seer.ufrgs.br/ambienteconstruido/article/view/9528 Ambiente Construído; v. 9, n. 4 (2009); 7-16 Ambiente Construído; v. 9, n. 4 (2009); 7-16 Ambiente Construído; v. 9, n. 4 (2009); 7-16 1678-8621 1415-8876 por https://seer.ufrgs.br/ambienteconstruido/article/view/9528/7052 https://seer.ufrgs.br/ambienteconstruido/article/downloadSuppFile/9528/1149 https://seer.ufrgs.br/ambienteconstruido/article/downloadSuppFile/9528/1150 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	Giordano, Brunoro Leite Souza, Rui Barbosa de John, Vanderley Moacyr
spellingShingle	Giordano, Brunoro Leite Souza, Rui Barbosa de John, Vanderley Moacyr Influence of binder in the drying shrinkage of fiber cement
author_facet	Giordano, Brunoro Leite Souza, Rui Barbosa de John, Vanderley Moacyr
author_sort	Giordano, Brunoro Leite
title	Influence of binder in the drying shrinkage of fiber cement
title_short	Influence of binder in the drying shrinkage of fiber cement
title_full	Influence of binder in the drying shrinkage of fiber cement
title_fullStr	Influence of binder in the drying shrinkage of fiber cement
title_full_unstemmed	Influence of binder in the drying shrinkage of fiber cement
title_sort	influence of binder in the drying shrinkage of fiber cement
description	There has much interest in the fiber cement industry in improving binder composition in order to achieve better economic, technical and environmental results. In this context, cements with lower clinker content are an attractive alternative and have already been used by the industry. However, fibercement sheets reinforced with organic fibers frequently present edge cracks resulting from drying the components in stockpiles. This study evaluates the impact of partially replacing clinker by blast furnace slag activated with sodium silicate on the mechanical properties, porosity, hydrated phases, and drying shrinkage of fiber cement reinforced with organic fibers. Samples were produced with commercial Brazilian CPII F-32 cement and also with a mixture of CPII F-32 with granulated blast furnace slag activated by sodium silicate. The results show that replacing clinker by slag activated by sodium silicates increases the amount of pores smaller than 0.003 ?m, due to an increase in the amount of CSH formed in hydration. Consequently, samples produced with CPII F-32 mixed with slag and sodium silicate present much higher drying shrinkage.
publisher	ANTAC - Associação Nacional de Tecnologia do Ambiente Construído
publishDate	2009
url	https://seer.ufrgs.br/ambienteconstruido/article/view/9528
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Influence of binder in the drying shrinkage of fiber cement

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