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Communications of the American Ceramic Society Estimation of Thermochemical Data for Calcium Silicate Hydrate (C‐S‐H)
Author(s) -
Fujii Kinjiro,
Kondo Wakichi
Publication year - 1983
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1983.tb11011.x
Subject(s) - calcium silicate hydrate , solubility , calcium , hydrate , silicate , calcium silicate , ceramic , solid solution , chemistry , mineralogy , inorganic chemistry , thermodynamics , analytical chemistry (journal) , materials science , metallurgy , chromatography , cement , physics , organic chemistry , composite material
Calcium silicate hydrate (C‐S‐H) can be viewed as a solid solution, 0.833Ca(OH) 2 .SiO 2 .0.917H 2 O‐xCa(OH) 2 , at equilibrium at 30°C. On this basis, the change in Gibbsfree energy (ΔG r ) in the solid‐solution reaction was calculated from solubility duta for C‐S‐H in water. The change in ΔG r with real ratio decreased notably for the higher calcium contents (CaO/Si0 2 1.7; ×0.867). Thermochemical values for C‐S‐H (CaO/SiO 2 =1.7) were estimated to be ΔH°=‐2890 kJ/mol, ΔG°=‐2630 kJ/mol, and S°=200 J1/mol.K at 298 K .