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On the kinetics of pozzolanic reaction in metakaolin–lime–water system

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Abstract

The kinetics of pozzolanic reaction metakaolin–lime is studied in the present work. Metakaolin is prepared by calcination of enriched kaolin (deposit “Senovo”, Bulgaria) at temperature of 830 ± 10 °C in a labscale muffle oven. The reaction is performed in intensively stirred water suspension at different temperatures in the range 20–100 °C. The kinetics is analyzed by comparing the experimental data with theoretical curves, derived according to appropriate kinetic and diffusion models taking into account the grain size distribution of metakaolin. The macroscopic mechanism and activation energy of the reaction are determined. It is found, that the activation energy decreases gradually from 71 to 45 kJ/mol[Ca(OH)2] with the increase of the reaction degree from 0.2 up to 0.6, respectively, which is a characteristic for transition regime reactions.

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Acknowledgements

This study was supported by PROJECT 189/2009 from the Scientific Research Fund of the Sofia University “St. Kliment Ohridski”. The authors are grateful to Prof. DSc. Al. Lenchev, Faculty of Chemistry, Sofia University “St. Kliment Ohridski”, for the useful discussion about the processing and presentation of kinetics data.

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Authors and Affiliations

  1. Faculty of Chemistry, Sofia University “St. Kliment Ohridski”, 1 J. Bourchier blvd, 1164, Sofia, Bulgaria

    J. Ninov

  2. University of Architecture, Civil Engineering and Geodesy, Building and Insulation Materials, 1 Hristo Smirnenski blvd, 1164, Sofia, Bulgaria

    I. Doykov & B. Petrov

  3. Institute of Mineralogy and Crystallography “Acad. Ivan Kostov”, “Acad. G. Bonchev” str., Block 107, 1113, Sofia, Bulgaria

    L. Dimova

  4. University of Chemical Technology and Metallurgy, 8 Kl. Ohridski blvd, 1756, Sofia, Bulgaria

    L. Brakalov

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  1. J. Ninov
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  2. I. Doykov
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  3. L. Dimova
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  4. B. Petrov
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  5. L. Brakalov
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Correspondence to J. Ninov.

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Ninov, J., Doykov, I., Dimova, L. et al. On the kinetics of pozzolanic reaction in metakaolin–lime–water system. J Therm Anal Calorim 105, 245–250 (2011). https://doi.org/10.1007/s10973-011-1419-7

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  • DOI: https://doi.org/10.1007/s10973-011-1419-7

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