Hydration of Cement in the Presence of Biocidal Modifiers Based on Metal Hydrosilicates

Abstract

This article presents the results of a study of the characteristics of hydration and properties of a composite biocidal cement binder containing hydrosilicates of barium, copper or zinc. It was found that copper hydrosilicates block hydration processes, and when zinc hydrosilicates are used, the rate of hydration is determined by the content of silicic acid. The limiting concentrations of biocidal modifiers have been established: zinc hydrosilicates—no more than 4% and copper hydrosilicates—no more than 0.5%, which are advisable to use for the manufacture of a biocidal composite binder. It is shown that modifying additives slow down the setting time, the amount of tricalcium silicate in cement stones increases, and their strength for some compositions decreases. Active binding of portlandite with the formation of calcium hydrosilicates occurs when the content of zinc hydrosilicates is 2%, which leads to an increase in the strength of the materials.

Evaluations of Efficiency of the Use of Amorphous Alumosilicates in Dry Mixes

“…When decorating walls of buildings and structures with tiles or restoration of architectural monuments or construction and finishing works in Russia, as well as in many other countries, are used modified dry mixes [1][2][3][4]. The main advantages in the application of dry mix is the ease of use and high technological and operational performance [5][6][7][8].…”