Moisture Expansion during the Formation of Crystalline Phases in Clay/CaCO3 Mixtures

R.A. Andrade; Heber Carlos Ferreira; Romualdo Rodrigues Menezes; Gelmires Araújo Neves

doi:10.4028/www.scientific.net/MSF.869.116

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HomeMaterials Science ForumMaterials Science Forum Vol. 869Moisture Expansion during the Formation of...

Moisture Expansion during the Formation of Crystalline Phases in Clay/CaCO₃ Mixtures

Abstract:

Information from technical literature indicates moisture expansion in ceramic materials is reduced due to calcium oxide being incorporated in their raw materials, and, therefore, 12.0% and 18.0% calcium carbonate was used to obtain fired products at temperatures of 850, 900, 950 and 1000oC. Some of these were re-fired to 1000oC, autoclaved and pulverized. Important reductions in moisture expansion occurred for re-fired products obtained from clay/carbonate mixtures. It was found that a few crystalline phases, resulting from incorporating calcium carbonate, appear at temperatures below 900oC in autoclaved and pulverized samples, obtained on using 12.0% and 18.0% calcium carbonate.

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Periodical:

Materials Science Forum (Volume 869)

Pages:

116-120

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.869.116

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Online since:

August 2016

Authors:

R.A. Andrade*, Heber Carlos Ferreira, Romualdo Rodrigues Menezes, Gelmires Araújo Neves

Keywords:

Carbonate Additions, Crystalline Phases, Heat Treatment, Moisture Expansion, Structural Brickwork, X-Ray Diffraction

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