ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 58, (3) 184 - 187 (2014)


THERMOANALYTICAL EVENTS AND ENTHALPIES OF SELECTED PHASES AND SYSTEMS OF THE CHEMISTRY AND TECHNOLOGY OF CONCRETE - PART 1. CALCIUM-SILICATE-ALUMINATE-SULFATE HYDRATES
 
Drábik Milan 1,2, Gáliková Ľubica 1, Scholtzová Eva 1, Hadzimová Eva 1
 
1 Institute of Inorganic Chemistry Slovak Academy of Sciences, 845 36 Bratislava, Slovakia
2 Department of Inorganic Chemistry Faculty of Science Comenius University, 842 15 Bratislava, Slovakia

Keywords: Calcium-silicate-sulfate-aluminate hydrates, Thaumasite, Ettringite, Thermal analysis, Decomposition enthalpy
 

Essential focus of the study has been to acquire thermoanalytical events, incl. enthalpies of decompositions - ∆H, of natural minerals of calcium-silicate-sulfate-aluminate hydrates. The thermoanalytical curves of thaumasite and ettringite are fully in line with that reported in reference sources. The values of ∆H calculated from DSC curves in the intervals of key decomposition steps ranging from 50 to 250 oC, achieve (1215 +/- 60) J g-1 for thaumasite and (930 +/- 40) J g-1 for ettringite. The differing values of decomposition enthalpies ∆H, as presented by various research groups, are indicated and critically discussed in the paper.


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