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on hydration of Portland cement was proved [ 18 , 19 ]. However, in the literature no information about a role of spent catalyst as an agent limiting conversion of calcium aluminates in aluminate cement composites has been found. The aim of

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strengthened—the 7 and 28-day flexural strength data prove also the formation of fibrous ettringite component modifying the structure of hardened cement composite. The presence of ettringite is clearly seen in the SEM micrographs ( Fig. 9 ). This is a

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silica into solution. In the case of conventional fly ash its initial low activity is confirmed by a lot of research works devoted to studies on this material as pozzolanic additive into Portland cement composites (e.g. [ 15 ]). Grains of pulverized fly

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