Table 9 Calculated ion activity products (IAP) for select CSH phases
From: Experimental Study of Cement - Sandstone/Shale - Brine - CO2Interactions
Cement Hydration | |||
|---|---|---|---|
Phase | Mass Balance | Log IAP 95°C | Log IAP 115°C |
Belite | Ca2SiO4 + 4H+ = 2Ca2+ + SiO2(aq) + 2H2O | 29.6 ± 1.2 | 28.9 ± 0.4 |
Hillibrandite | Ca2SiO3(OH) 2*0.2H2O + 4H+ = 2Ca2+ + SiO2(aq) + 3.2H2O | 29.6 ± 1.2 | 28.9 ± 0.4 |
Jennite - CSH | Ca1.67SiO2(OH)3.33: 0.43H2O + 3.33H+ = 1.67Ca2+ + SiO2(aq) +3.76H2O | 27.8 ± 1.4 | 27.3 ± 0.5 |
Tobermorite | Ca0.83SiO2(OH)1.7*0.5H2O + 1.66H+ = 0.83Ca2+ + SiO2(aq) + 2.2H2O | 11.7 ± 0.7 | 11.1 ± 0.5 |
Pseudowollastonite | CaSiO3+ 2H+ ⇔ SiO2 + Ca2+ + H2O | 11.3 ± 1.3 | 11.5 ± 0.5 |