Nanomodifier Based on Zinc Hydrosilicates for Cement Systems.

The present work is devoted to the synthesis and experimental study of zinc hydrosilicates. The possibility of low-temperature synthesis of such hydrosilicates from zinc acetate and silicic acid is demonstrated. The silicic acid was synthesized in presence of acidic Fe(OH)₃ sol. It is found that the size of the nanoparticles is in the range 10-30 nm. High values of particle size correspond to the high values of silicic acid and Fe(OH)₃ sol concentrations. High α values also lead to the formation of enlarged particles. The lowest pH value of the colloidal solution is observed for C(Fe(OH)₃) = 0.7 % and α = 0.5. Such colloidal solution of zinc hydrosilicate is characterized by high aggregate and sedimentation stability. The latter allows to prolong the shelf life of nanomidifier. [ABSTRACT FROM AUTHOR]