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

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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.
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Keywords: BLENDED MORTARS AND CONCRETES; CALCINED KAOLINITE CLAY; MECHANICAL STRENGTH; METAKAOLIN; POZZOLANIC ACTIVITY; THERMAL PROCESS

Document Type: Research Article

Publication date: 2008-06-01

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