Ceramics-Silikáty 58 (4) 243-248 (2014)

THERMOANALYTICAL EVENTS AND ENTHALPIES OF PHASES AND SYSTEMS OF THE CHEMISTRY AND TECHNOLOGY OF CONCRETE PART II. HYDRATED CEMENTS

Drábik M., Gáliková Ľ., Scholtzová E., Hadzimová E.

Essential focus of the study has been to acquire thermoanalytical events, incl. enthalpies of decompositions - ΔH, of technological materials based on two types of Portland cements. The values of thermoanalytical events and also ΔH of probes of technological compositions, if related with the data of a choice of minerals of calcium-silicate-sulfate-aluminate hydrates, served as a valued input for the assessment of phases present and phase changes due to the topical hydraulic processes. The results indicate mainly the effects of „standard humidity“ or „wet storage“ of the entire hydration/hydraulic treatment, but also the presence of cement residues alongside calcium-silicate-sulfate-aluminate hydrates (during the tested period of treatment). “A diluting” effect of unhydrated cement residues upon the values of decomposition enthalpies in the studied multiphase system is postulated and discussed.

Keywords: Calcium-silicate-sulfate-aluminate hydrates, Technological compositions, Thermal analysis, Decomposition enthalpies