Geopolymers
Inorganic polymeric new materials
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J. Ninov
J. Ninov
Faculty of Chemistry, Sofia University “St. Kliment Ohridski”, 1 J. Bourchier blvd, 1164, Sofia, Bulgaria
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I. Doykov
I. Doykov
University of Architecture, Civil Engineering and Geodesy, Building and Insulation Materials, 1 Hristo Smirnenski blvd, 1164, Sofia, Bulgaria
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L. Dimova
L. Dimova
Institute of Mineralogy and Crystallography “Acad. Ivan Kostov”, “Acad. G. Bonchev” str., Block 107, 1113, Sofia, Bulgaria
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B. Petrov
B. Petrov
University of Architecture, Civil Engineering and Geodesy, Building and Insulation Materials, 1 Hristo Smirnenski blvd, 1164, Sofia, Bulgaria
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L. Brakalov
L. Brakalov
University of Chemical Technology and Metallurgy, 8 Kl. Ohridski blvd, 1756, Sofia, Bulgaria
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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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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
| Size | A4 |
| Year of Foundation |
1969 |
| Volumes per Year |
1 |
| Issues per Year |
24 |
| Founder | Akadémiai Kiadó |
| Founder's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. |
| Publisher | Akadémiai Kiadó Springer Nature Switzerland AG |
| Publisher's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11. |
| Responsible Publisher |
Chief Executive Officer, Akadémiai Kiadó |
| ISSN | 1388-6150 (Print) |
| ISSN | 1588-2926 (Online) |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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