The prepared alkali-activated binders (AAB) and composites using suitable latent hydraulic raw materials represent analternative to materials based on Portland cements. This paper deals with ways how to influence the functional parametersof AAB by setting up mixtures of granulated blast furnace slag (GBFS) and fly ash with selected chemical compositions. Inthis way the course of hydration process is modified and the phase composition of products of alkali activation is changed aswell as their final properties. The amorphous character of the hydration products makes evaluation of the phase compositionof hardened AAB difficult and significantly limits the number of experimental techniques suitable to characterise their phasecomposition. It was observed that measuring the pH of water extracts obtained from the alkali-activated mixtures can givesupplementary information about the process of hardening of alkali-activated mixtures of GBFS and fly ash.
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