Abstract
In this paper the results of the research of common and special cements were presented. The scope included about 200 samples of industrial cements produced in 9 manufacturing plants in Poland according to cement standard PN-EN 197-1.Obtained results indicate that for different cement plants strong correlation between the results of heat of hydration tests and the compressive strength after 28days of hardening of Portland cement CEM I without mineral additions is observed, irrespectively from strength class of that cement. Even better correlation is observed for particular cement plant. However, in the case of blast furnace cement such relationships are in the borderline between weak and moderate for different cement plants and moderate within one manufacturing plant.Achieved for particular cement plant high correlation factors allow to estimate with very low error the standard compressive strength of cement after 28days of hardening on the basis of heat of hydration tests just after 3days. It especially applies for Portland cement CEM I.
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