Ordinary Portland cement and blast furnace slag cement pastes with various water to binder ratio between 30 to 50% were hydrated under different curing conditions. Hydration ratio of cement compounds and slag, amount of hydration products were determined quantitatively by Rietveld method. Hydration of BFS is a little delayed in air-dried curing of 60%RH. CaO/SiO
2 molar ratio of C-S-H decrease as increasing the amount of produced Ca (OH)
2; CaO/Si0
2 molar ratio of C-S-H in blast furnace slag cement is about 1.6, ordinary Portland cement is about 1.8 at the age of 91 days in water curing. CaO/Si0
2 molar ratio of C-S-H in blast furnace slag cement and ordinary Portland cement remarkably decrease below 1.0 from carbonation.
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