Influence of raw materials and potassium and silicon concentrations on the formation of a zeolite phase in a geopolymer network during thermal treatment

摘要: Abstract The development of porous materials based on geopolymers allows the benefits eco-consumption, good insulating properties and mechanical to be combined. For useful, an understanding their under various conditions is important. Attention was given structural evolution with heating. evolutions were investigated using thermal analysis infrared spectroscopy. formation a crystalline phase observed identified as zeolite. To elucidate roles played by raw materials, silicon concentration potassium phase, three parameters in foam synthesis process modified. influence silica fume metakaolin appearance examined through reactivity contact solution. Different behaviors directly linked network composition observed. Silica-fume-based samples showed crystallization dehydroxylation due large silicon, which likely led hydrated species. zeolite-phase upon application heat depended only dissolution terms species grain size. Studying variation amount allowed determination maximum minimum concentration. zeolite occurred at greater than 3.5 mol·L − 1 lower 16.5 mol·L , confirmed presence F-zeolites.