The possibility of using an additive based on amorphous aluminosilicates in the formulation of calcareous dry construction mixtures as a modifying additive that increases the thermal insulation properties of the solution based on the mixture being developed is investigated. Several compositions of an aluminosilicate additive with different proportions of raw components have been considered. For determine the optimum mode of synthesis of the test additive, special attention was paid to the change in the porosity and compressive strength of the calcareous composite. Optimum content of aluminosilicate additive in the composition of calcareous composite was selected. The degree of influence of the magnitude of the liquid glass module used in the production of the aluminosilicate additive on the change in the strength of the calcareous composite with the use of a modifying additive was evaluated. The change in the strength, density, and porosity of a calcareous composite was studied in the presence of the additive being developed, depending on the temperature regime and the duration of the synthesis of amorphous aluminosilicates. It has been established that the temperature and heat treatment time of the aluminosilicate additive does not significantly affect the density of the cement composite. It was also found that the use of an additive based on amorphous aluminosilicates in the composition of calcareous dry construction mixtures leads to an increase in the porosity of the samples as compared to the control samples (without additive).

Keywords: amorphous aluminosilicates, dry building mixtures, lime, strength, synthesis, modifying additives, analysis