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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