Thaumasite

Formula : CaSiO3CaSO4CaCO3:15H2O

Space group: 
Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 63/m

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Individual properties (298.15 K)
M
g·mol-1
 V°
cm3·mol-1
 ΔGºf
J·mol-1
 ΔHºf
J·mol-1
 Sº
J·mol-1·k-1
 CP
J·mol-1·K-1
622.619 329.428 (Ref.: 10bbla/bou) Blanc, Ph.; Bourbon, X.; Lassin, A.; Gaucher, E.C. 2010 - Chemical model for cement-based materials: Thermodynamic data assessment for phases other than C-S-H. Cement and Concrete Research, 40, p. 1360-1374. -7559697 (Ref.: 10bbla/bou) Blanc, Ph.; Bourbon, X.; Lassin, A.; Gaucher, E.C. 2010 - Chemical model for cement-based materials: Thermodynamic data assessment for phases other than C-S-H. Cement and Concrete Research, 40, p. 1360-1374. -8682075 (Ref.: Internal calculation) 941.500 (Ref.: 08sch/lot) Schmidt, T., Lothenbach, B., Romer, M., Scrivener, K.L., Rentsch, D., Figi, R. (2008), A thermodynamic and experimental study of the conditions of thaumasite formation, Cement and Concrete Research, 38(3), 337-349. 1058.97 (Ref.: 08sch/lot) Schmidt, T., Lothenbach, B., Romer, M., Scrivener, K.L., Rentsch, D., Figi, R. (2008), A thermodynamic and experimental study of the conditions of thaumasite formation, Cement and Concrete Research, 38(3), 337-349.
CP(T) = a + b·T + ·c·T-2 (T in Kelvin)
a
J·mol-1·K-1
 b * 103
J·mol-1·K-2
 c * 10-5
J·K·mol-1
 Maier Kelley Ref.
982.58 311.75 -14.71 (Ref.: 08sch/lot) Schmidt, T., Lothenbach, B., Romer, M., Scrivener, K.L., Rentsch, D., Figi, R. (2008), A thermodynamic and experimental study of the conditions of thaumasite formation, Cement and Concrete Research, 38(3), 337-349.
Reaction properties

Thaumasite + 3H+ ⇌ HCO3- + 3Ca+2 + SO4-2 + H4SiO4

298.15 K, 1 bar log10K: 10.31 ΔH°r:-6676 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K 10.34 10.31 10.12 9.82 9.37 8.73 7.80 6.28
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-3052.897533 -0.465370 169350.307022 1109.638869 -9935701.278915