Abstract
In this article Portland-slag cement was step by step replaced with pozzolana (fine red-clay ceramics) in concrete. This is first step of research that is why the only measured characteristics were consistency of mixtures and compressive strength. There were designed four mixtures with increasing replacement of Portland cement by 10 % each (CR, C1, C2, C3) where complete activity of pozzolana was assumed. Mixtures C4, C5 and C6 were designed with respect to presumed just partial activity of the used pozzolana (set as 40 %). The water/cement coefficient was decided to be taken according to the consistence of the mortar.
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