The mechanisms and kinetics of early stage C4AF hydration with gypsum was studied by measuring the heat of hydration with a conduction calorimeter. The heat of the reaction was 173 cal/ g-C4AF. The reaction equation was estimated to be C4AF + 4CaSO4·2H2O + 35 1 3 H2O → 4 3C3(A0.75,F0.25)·3CSH31+ 2 3FH3The equation for rate of hydration was ζ = 0.25t as the thickness (ζ) or hydrated C4AF increased from 0 to 0.6 μm. © 1981.
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