Basing on presented results one may constater that the
course of initial hydration of calcium aluminate cement in
the presence of additives is dependent on both their quality
and quantity. In the case of addition of Portland cement the
above statements are also confirmed by work of other
authors [6]. Early hydration of binder composed of calcium
aluminate cement and Portland cement depends on quantity
proportion of both components. Thus, different products
may arise during hydration of these systems and it may be
observed using calorimetry measurements.