Mineral Constituents of a Clay from Campos dos Goytacazes, Brazil

Ceramic pot filters (CPFs) have been shown to be an effective means of household water treatment in the developing world. The filters are typically made using local labor and locally available materials including clay soils and various burn out materials used to create porosity. Artisanal approaches may be used to manufacture the filters, and there have been efforts to improve CPF performance through laboratory studies. The importation of soil to make the filters may be highly regulated and could be cost prohibitive, so some researchers use commercially available clay to fabricate experimental filters. However, such efforts typically do not include a comparison of the engineered clay to native clay soil, nor do most studies compare the performance of experimental CPFs fabricated from engineered clay to CPFs made from native clay. This study compares mineralogical and geotechnical properties of a clay soil from Rabinal, Guatemala, used to produce CPFs in that country to an engineered clay developed for use in laboratory experiments. Flowrate is the primary quality control parameter used in CPF production, and performance testing indicated that experimental CPF flowrates were not necessarily a function of clay composition. However, engineered clay could be used as a surrogate for native soil with some limitations.

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Development of Ceramics Based on Clays from Different Regions in the State of Rio de Janeiro, Brazil

Babisk

Ribeiro

Monteiro

et al. 2014

MSF

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The state of Rio de Janeiro, southeast of Brazil, has two poles of conventional clay ceramic production, mainly bricks and roofing tiles. In the north region of the state, the county of Campos dos Goytacazes and in the state center, the county of Itaborai, present distinct types of clay. With the aim to improve some characteristics of the Campos dos Goytacazes clay, the objective of this work was to investigate different mixtures with the Itaborai clay. Samples were press-molded with compositions of 0, 25, 50 and 75 wt% of both clays. The samples were fired at 800°C and the technical properties related to plasticity, density, linear shrinkage, water absorption and flexural strength were determined. The results indicated that the superior performance of the Itaborai clay significantly improves that of the Campos dos Goytacazes clay for any incorporated percentage. The mechanisms and reasons for these results are discussed.

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Mineral Constituents of a Clay from Campos dos Goytacazes, Brazil

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Ground waste ceramic brick effect at different times on mortar

Ground waste ceramic brick effect at different times on mortar

Comparison of a native clay soil and an engineered clay used in experimental ceramic pot filter fabrication

Development of Ceramics Based on Clays from Different Regions in the State of Rio de Janeiro, Brazil

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