Abstract
The paper presents the results of tests of compressive strength, heat of hardening and crack resistance of high-performance concretes, which composition was chosen to ensure high early strength. This enables the proper rotation of moulds in prefabrication plants, without the thermal treatment. It has been proven that achieving a compressive strength of 36 MPa after 16 hours is possible by using CEM I 52.5 R Portland cement. In this case the temperature rises slightly during the concrete hardening in comparison to concrete with CEM II/A-S 52.5N slag cement, what can lead to higher thermal stresses in the element. On the other hand, the use of Portland cement reduces the risk of cracking caused by shrinkage, what is shown by smaller values of stress rate q.
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