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

Published online by Cambridge University Press:  09 July 2018

R. Mejía De Gutiérrez ,
J. Torres ,
C. Vizcayno  and
R. Castello
R. Mejía De Gutiérrez
Affiliation:
Grupo de Materiales Compuestos, Escuela de Ingeniería de Materiales, Universidad del Valle, Cali, Colombia
J. Torres
Affiliation:
Grupo de Materiales Compuestos, Escuela de Ingeniería de Materiales, Universidad del Valle, Cali, Colombia
C. Vizcayno*
Affiliation:
Centro de Ciencias Medioambientales, CSIC, Madrid, Spain
R. Castello
Affiliation:
Centro de Ciencias Medioambientales, CSIC, Madrid, Spain
*
*E-mail: [email protected]
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Abstract

The effect of heating, to temperatures between 400 and 1200ºC, 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 700ºC 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 800ºC.

Keywords

calcined kaolinite claymetakaolinthermal processpozzolanic activityblended mortars and concretesmechanical strength
Type
Research Article
Information
Clay Minerals , Volume 43 , Issue 2 , June 2008 , pp. 177 - 183
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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