ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Enthalpie Analysis of Melts in the CaO Si0₂(CS)—2CaO Si0₂(C₂S)—2CaO Al₂0₃ Si0₂(C₂AS) System

L. Kosa, I. Nerád, K. Adamkovičová, and E. Mikšíková

Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava

Abstract: The heats of solution of  γ-C₂S and β-C₂S at temperature 298 K have been measured to reach the consistency of the values of relative enthalpy of melts in the CS-C₂S-C₂AS system determined by two different methods: combination of measurements with the drop and solution calorimeters and the method of inverse drop calorimetry. Assuming that the athermic solutions are formed on the connecting line CS-C₂S, the temperature-composition dependence of relative enthalpy in the CS-C₂S-C₂AS system has been determined by regressive analysis. On the basis of this dependence the enthalpies of mixing on formation of melts in part of the CS-C₂S-C₂AS system, i.e. the C₃S₂-CS-C₂AS subsystem, from the melts of CS, C₂S, and C₂AS at temperature 1873 K were calculated. The obtained values point to exothermic character of reactions on formation of the melts of this subsystem from the CS, C2S, and C₂AS melts.

Full paper in Portable Document Format: 526a731.pdf

Chemical Papers 52 (6) 731–735 (1998)