Abstract
The article considers the prospects of using gypsum-based composite materials for repairing damaged walls of limestone-shell rock buildings. Repairing damaged shell rock structures with cement compositions intensifies destructive processes; the use of lime-sand mixtures for repair work on building facades is problematic due to their prolonged hardening. The article substantiates the use of gypsum as the basis of the repair composition. The use of gypsum composites for exterior works requires a significant increase in their water resistance. A plaster mixture based on an ash-cement binder with an addition of lime is proposed; a series of samples with different component contents were made in the planned experiment. Their water resistance was studied using two criteria: the conventional softening coefficient (Кр) and the new one - the water resistance index (Iw); a comparison of these criteria was performed. The significant dependence of these criteria on the measurement conditions, which are not currently standardized, is established. Mathematical models of water resistance characteristics have been built, with the help of which the influence of the content of components on the resistance of the plaster composition to water has been analyzed. To further improve the water resistance of the mixture, a hydrophobizing additive was selected in terms of surface wetting and water absorption. Further research is aimed at optimizing the repair composition using plasticizing, hydrophobizing, and adhesive additives.
Published Version
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