Hydration of C_3S and β-C_2S pure minerals in water vapor

The hydration of pure minerals C 3S and β C 2S were studied at 20 ℃ and 40 ℃ in water vapor . The relative humidity of gases are 99%, 97.5% and 95% respectively. The results showed that C 3S hydrated slowly in gas with relative humidity higher than 97.5%, the hydration was speeded up in higher temperature gas. But its hydration rate is too slow in gas of 95% relative humidity. β C 2S hydrates very little in gas.