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Alkali-activated systems, formed by the alkaline activation are inorganic materials characterized by the potential of ecological use. The objective of experiment was to investigate the influence of different activators on selected properties of alkali-activated systems based on granulated blast furnace slag. At the beginning of the experiment, 21 different samples prepared of 12 types of activators were tested to the basic properties. Then, selected samples with the best potencial to use were tested to compressive and flexural strength, frost resistance and surface resistance to chemical de-icing substances. The initial setting time achieved 25 - 95 minutes and final setting time achieved 30 - 105 minutes, compressive strengths were in the range 40 - 100MPa, frost resistance and resistance of surface to water and defrosting chemicals were confirmed.

Alkali activated systems are materials formed by alkali-activation of latent hydraulic or pozzolanic materials. The outcome is a polymeric structure with properties comparable to materials based on cement.The principle of the experiment is to compare selected properties of alkali-activated materials based on blast furnace slag and using various types of activator (sodium water glass, potassium water glass, DESIL AL and sodium metasilicate) to binders based on white and Portland cements of the highest quality. The samples were left for one year in environments simulating the conditions in the interior and exterior. Selected physical-mechanical properties were evaluated and compared.

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Česká a evropská legislativa je zaměřena na ochranu životního prostředí, udržitelného rozvoje a recyklovatelnost. Nicméně v oblasti stavebnictví jsou stále nejhojněji zastoupena pojiva na bázi portlandského cementu, ačkoli jeho výroba negativně ovlivňuje životní prostředí těžbou přírodních zdrojů a vytvářením emisí CO2. Vhodným řešením tohoto problému se jeví použití alternativních pojiv. Tento příspěvek stručně popisuje nejčastěji používané suroviny pro přípravu alkalicky aktivovaných systémů a vlastnosti připravených kompozitů, v závislosti na použitých surovinách.