Preliminary evaluation of kaolinitic waste from kaolin processing industries as a raw material for the production of a highly reactive metakaolinite

This work has assessed potential uses of kaolinitic waste from kaolin processing industries as a raw material for the production of a highly reactive metakaolinite. The mineralogical characteristics of both this residue and also of the metakaolinite have been determined by X-ray diffraction and by d...

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Hoofdauteurs:	Barata, Márcio Santos, Dal Molin, Denise Carpena Coitinho
Formaat:	Online
Taal:	por
Gepubliceerd in:	ANTAC - Associação Nacional de Tecnologia do Ambiente Construído 2008
Online toegang:	https://seer.ufrgs.br/ambienteconstruido/article/view/3412
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id	ojs-article-3412
record_format	ojs
spelling	ojs-article-34122008-11-21T22:58:46Z Preliminary evaluation of kaolinitic waste from kaolin processing industries as a raw material for the production of a highly reactive metakaolinite Avaliação preliminar do resíduo caulinítico das indústrias de beneficiamento de caulim como matéria-prima na produção de uma metacaulinita altamente reativa Barata, Márcio Santos Dal Molin, Denise Carpena Coitinho Reciclagem; Resíduo; Caulim; Metacaulinita; Sílica ativa; Concreto de alto desempenho This work has assessed potential uses of kaolinitic waste from kaolin processing industries as a raw material for the production of a highly reactive metakaolinite. The mineralogical characteristics of both this residue and also of the metakaolinite have been determined by X-ray diffraction and by differential thermal analysis. The metakaolinite pozzolanic activity was measured using Portland cement mortars. Resulting effects derived from metakaolinite incorporation on concrete were evaluated through compressive strength and water absorption tests. A 10% value was adopted for this incorporation procedure, whereas water/binder ratios chosen were 0.39, 0.47 and 0.65. Besides the mixtures, reference and silica fume concretes were also moulded. The metakaolinite pozzolanic activity index obtained was 103%, which is similar to that of silica fume. Metakaolinite concretes showed higher compressive strength values than that of reference concretes and similar to that of silica fume concretes. Concerning capillary absorption, metakaolinite concretes exhibited water penetration rates ranging from 0.73 to 0.98 mm/h1/2, similar to those of silica fume concretes and significantly lower to those of reference concretes. Therefore, this study has demonstrated that this kaolinitic waste is an excellent raw material for high reactivity metakaolinite production. Este trabalho avaliou as potencialidades de emprego do resíduo caulinítico das indústrias de beneficiamento do caulim como matériaprima na produção de uma metacaulinita altamente reativa. As características mineralógicas do resíduo e da metacaulinita foram analisadas pela difratometria de raios X e pela análise térmica diferencial. A atividade pozolânica da metacaulinita foi determinada em argamassas de cimento Portland. O efeito da incorporação da metacaulinita no concreto foi investigado pela resistência à compressão e por um teste de absorção capilar de água. O percentual de adição adotado foi de 10% e as relações água/aglomerante escolhidas foram 0,39, 0,47 e 0,65. Além das misturas de referência, foram também moldados concretos com sílica ativa. O índice de atividade pozolânica da metacaulinita foi de 103%, semelhante ao da sílica ativa. Os concretos com metacaulinita apresentaram resistências à compressão superiores aos de referência e similares aos com sílica ativa. Quanto à absorção capilar, os concretos com metacaulinita apresentaram taxas de absorção de água entre 0,73 e 0,98 mm/h1/2, similares às dos concretos com sílica ativa e significativamente inferiores às dos concretos de referência. Os resultados demonstram que este resíduo caulinítico é uma excelente matéria-prima para fabricação de metacaulinita de alta reatividade. ANTAC - Associação Nacional de Tecnologia do Ambiente Construído 2008-04-14 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://seer.ufrgs.br/ambienteconstruido/article/view/3412 Ambiente Construído; v. 2, n. 1 (2002); 69-78 Ambiente Construído; v. 2, n. 1 (2002); 69-78 Ambiente Construído; v. 2, n. 1 (2002); 69-78 1678-8621 1415-8876 por https://seer.ufrgs.br/ambienteconstruido/article/view/3412/1826 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	Barata, Márcio Santos Dal Molin, Denise Carpena Coitinho
spellingShingle	Barata, Márcio Santos Dal Molin, Denise Carpena Coitinho Preliminary evaluation of kaolinitic waste from kaolin processing industries as a raw material for the production of a highly reactive metakaolinite
author_facet	Barata, Márcio Santos Dal Molin, Denise Carpena Coitinho
author_sort	Barata, Márcio Santos
title	Preliminary evaluation of kaolinitic waste from kaolin processing industries as a raw material for the production of a highly reactive metakaolinite
title_short	Preliminary evaluation of kaolinitic waste from kaolin processing industries as a raw material for the production of a highly reactive metakaolinite
title_full	Preliminary evaluation of kaolinitic waste from kaolin processing industries as a raw material for the production of a highly reactive metakaolinite
title_fullStr	Preliminary evaluation of kaolinitic waste from kaolin processing industries as a raw material for the production of a highly reactive metakaolinite
title_full_unstemmed	Preliminary evaluation of kaolinitic waste from kaolin processing industries as a raw material for the production of a highly reactive metakaolinite
title_sort	preliminary evaluation of kaolinitic waste from kaolin processing industries as a raw material for the production of a highly reactive metakaolinite
description	This work has assessed potential uses of kaolinitic waste from kaolin processing industries as a raw material for the production of a highly reactive metakaolinite. The mineralogical characteristics of both this residue and also of the metakaolinite have been determined by X-ray diffraction and by differential thermal analysis. The metakaolinite pozzolanic activity was measured using Portland cement mortars. Resulting effects derived from metakaolinite incorporation on concrete were evaluated through compressive strength and water absorption tests. A 10% value was adopted for this incorporation procedure, whereas water/binder ratios chosen were 0.39, 0.47 and 0.65. Besides the mixtures, reference and silica fume concretes were also moulded. The metakaolinite pozzolanic activity index obtained was 103%, which is similar to that of silica fume. Metakaolinite concretes showed higher compressive strength values than that of reference concretes and similar to that of silica fume concretes. Concerning capillary absorption, metakaolinite concretes exhibited water penetration rates ranging from 0.73 to 0.98 mm/h1/2, similar to those of silica fume concretes and significantly lower to those of reference concretes. Therefore, this study has demonstrated that this kaolinitic waste is an excellent raw material for high reactivity metakaolinite production.
publisher	ANTAC - Associação Nacional de Tecnologia do Ambiente Construído
publishDate	2008
url	https://seer.ufrgs.br/ambienteconstruido/article/view/3412
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Preliminary evaluation of kaolinitic waste from kaolin processing industries as a raw material for the production of a highly reactive metakaolinite

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