Procházka, L.; Boháčová, J.; Vojvodíková, B. Influence of Fly Ash Denitrification on Properties of Hybrid Alkali-Activated Composites. Crystals2022, 12, 633.
Procházka, L.; Boháčová, J.; Vojvodíková, B. Influence of Fly Ash Denitrification on Properties of Hybrid Alkali-Activated Composites. Crystals 2022, 12, 633.
Abstract
This article deals with the possibility of partial replacement of blast furnace slag with fly ash after denitrification by the Selective Non-Catalytic Reduction (SNCR) method in alkali-activated materials. In the experiment, the basic physical-mechanical properties and durability properties were tested, the hydration reaction was monitored in a calorimeter and infrared spectroscopy was performed. Results were compared between mixtures prepared with fly ash without denitrification and also with reference mixture based only on alkali-activated blast furnace slag. The basic result is the finding, that hybrid alkali-systems with fly ash after denitrification show similar trends as hybrid alkali-systems with fly ash without denitrification. The significant effect of fly ash is manifested especially in terms of resistance to freeze-thaw. The reactions in the calorimeter show a slower development of reactions with increasing replacement of slag by fly ash. In the case of testing resistance to leaching in demineralised water, a decrease of flexural strength was found, which corresponds to the conclusions of strength testing, that long-term deposition of bodies in water causes deterioration of mechanical properties.
Copyright:
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