When the content of calcium aluminate cement is not
less than 80%, heat releasing is mainly caused by hydration
of this cement. Portland cement also undergoes hydration
in this time but this process does not cause separated heat
effect on calorimetric curve [8]. It is visible on presented
results for cement paste containing 5% of Portland cement
(see Fig. 1a). In case of mixtures rich in Portland cement
(not studied in this work) calorimetric curves are similar to
result for Portland cement, especially in cases when content
of aluminate cement does not exceed 10% [6].