Biostability of cement composites from dry building mixtures

A study was made of the influence of a model biological environment of the products of the metabolism of filamentous fungi on the biostability of cement composites from industrial dry building mixes for outdoor and indoor work. The low resistance of samples without additional bioprotection to the influence of the biological environment was established. Relevant is the development of cement composites with biocidal additives to ensure resistance to biologically and chemically aggressive environments without reducing the strength properties. The degree of fouling of samples from various types of dry building mixtures in a model environment of metabolic products of filamentous fungi was determined. Eight composites of different composition were studied under the influence of 13 types of model medium. The stability of the samples was established at a concentration of medium components from 0 to 5% by weight. Tile adhesive "UNIS 2000", tile adhesive "Prospectors", putty "Prospectors", facade plaster "KNAUF" have fungus-resistant properties. Putty "CT29 Ceresit". Waterproofing "VodoStopGlims", plaster "IvsilGross" and self-leveling floor "Magma" are non-mushroom resistant. The most unfavorable concentrations of filamentous fungi metabolism products for the samples were revealed. The effectiveness of the use of polymer-based biocidal additives of the Teflex series (OOO SoftPROTECTOR, Russia) on the resistance of cement composites to biodegradation was revealed. The additives "Anti-Salt Wash", "For Metal" and "Universal" showed the greatest efficiency, their use provides fungi resistance and fungicidal properties of building materials.

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