Communications of the American Ceramic Society Estimation of Thermochemical Data for Calcium Silicate Hydrate (C-S-H) |
| |
| Authors: | Kinjiro Fujii Wakichi Kondo |
| |
| Affiliation: | National Chemical Laboratory for Industry, (Tsukuba Research Center), Yatabe, Ibaraki 305, Japan |
| |
| Abstract: | Calcium silicate hydrate (C-S-H) can be viewed as a solid solution, 0.833Ca(OH)2.SiO2.0.917H2O-xCa(OH)2, at equilibrium at 30°C. On this basis, the change in Gibbsfree energy (ΔGr) in the solid-solution reaction was calculated from solubility duta for C-S-H in water. The change in ΔGr with real ratio decreased notably for the higher calcium contents (CaO/Si021.7; ×0.867). Thermochemical values for C-S-H (CaO/SiO2=1.7) were estimated to be ΔH°=-2890 kJ/mol, ΔG°=-2630 kJ/mol, and S°=200 J1/mol.K at 298 K . |
| |
| Keywords: | |
|
|
