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Clay Minerals; June 2008; v. 43; no. 2; p. 177-183; DOI: 10.1180/claymin.2008.043.2.02
© 2008 Mineralogical Society of Great Britain and Ireland
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Research Paper

Influence of the calcination temperature of kaolin on the mechanical properties of mortars and concretes containing metakaolin

R. MEJÍA DE GUTIÉRREZ1, J. TORRES1, C. VIZCAYNO2,* and R. CASTELLO2

1 Grupo de Materiales Compuestos, Escuela de Ingeniería de Materiales, Universidad del Valle, Cali, Colombia, and2 Centro de Ciencias Medioambientales, CSIC, Madrid, Spain

* E-mail: cvizcayno{at}ccma.csic.es

(Received 13 November 2006; revised 21 June 2007)

The effect of heating, to temperatures between 400 and 1200°C, on the dehydroxylation of kaolin and the pozzolanic activity of the resulting amorphous material were determined by a variety of analytical techniques. Mixtures of concrete containing variable amounts of kaolin calcined at 700°C were analysed and the results compared with those for concrete samples containing two different types of imported metakaolin. As shown in this work, Colombian kaolin can be used effectively as a raw material to obtain a highly active product (metakaolin). The optimum heating temperature for the kaolin is between 700 and 800°C.

KEYWORDS: calcined kaolinite clay, metakaolin, thermal process, pozzolanic activity, blended mortars and concretes, mechanical strength






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