In this paper water transport and storage parameters of hydrophobic plasters are studies. This article is focused on behavior of water and its degradation process inside of material matrix. Most of physic-chemical deteriorations of building materials are related to the penetration of moisture into building structure. For higher resistance of penetration water into materials, hydrophobic additions are used. Especially inner hydrophobic additive was applied to the interior structure to reduce destructive effect of water. Water storage parameters are slightly better for plaster without hydrophobisation. However, from the quantitative point of view the difference was not so important. Comparative measurements with pure lime-metakaolin plaster were done as well.
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