Abstract
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/SiO2 molar ratio of C-S-H decrease as increasing the amount of produced Ca (OH) 2; CaO/Si02 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/Si02 molar ratio of C-S-H in blast furnace slag cement and ordinary Portland cement remarkably decrease below 1.0 from carbonation.
