Abstract
The chemical processes underlying the formation of hydroaluminosilicate geopolymer materials under various conditions from various mixtures of amorphous SiO2, metakaolin, sodium hydroxide, and water were studied. The results demonstrate that hardening at elevated temperatures is favorable for partial crystallization of the forming zeolite-like phases, whereas room-temperature hardening leads to the formation of X-ray amorphous phases. According to X-ray microanalysis data, the composition of the aluminosilicate matrix formed during hardening differs markedly from the intended composition. At the same time, the onset temperature for thermal dehydration (about 60–80°C) and hydrolysis kinetics varied little from sample to sample, which allowed us to tentatively determine the composition of the forming hydroaluminosilicate polymer.
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