ВЛИЯНИЕ ДЛИТЕЛЬНОСТИ МЕХАНОХИМИЧЕСКОГО СИНТЕЗА НА СТРУКТУРНО-МОРФОЛОГИЧЕСКИЕ ХАРАКТЕРИСТИКИ СИЛИКАТ-КАЛЬЦИЕВОЙ ДИСПЕРСИИ

Abstract

Mechanochemical synthesis of sucrose-modified calcium hydrosilicates as precursors of calcium silicate dispersions – polyfunctional additives for cement systems was carried out on a fine grinding vibromill VM-20. The influence of duration of mechanochemical synthesis of modified hydrosilicates on the phase composition of calcium silicate dispersions, morpho-structural characteristics of the nanostructured calcium silicate xerogel particles, as well as technological features of the reaction mass of mechanochemical synthesis was studied. It was found that the viscosity of the reaction mass of mechanochemical synthesis changes non-monotonically during synthesis: in the first 2 hours of mechanochemical synthesis, the viscosity decreases; subsequently, the viscosity of the mixture increases slightly; the reaction mass maintains high fluidity throughout the entire synthesis process; the presence of raw mineral materials in the reaction mass continues to be fixed throughout the synthesis (up to 7 hours); recrystallization processes of synthesized weakly crystallized phases are activated after 6 hours of grinding.
 The volume of the synthesized xerogel was estimated from the specific surface area of the calcium silicate dispersion. It was found that the processes of recrystallization of weakly crystallized phases synthesized during mechanochemical synthesis do not affect the volume of xerogel in the composition of calcium silicate dispersion, the specific surface area of the calcium silicate dispersion increases in proportion to the duration of the mechanochemical synthesis of modified calcium hydrosilicates. The duration of mechanochemical synthesis does not affect the morpho-structural characteristics of coagulation xerogel particles.