Abstract
Changes in water transport mechanism and in mechanical properties of organic coatings for buildings due to the leaching process are discussed. The water transport mechanism was investigated by measuring vapor and liquid water permeation and absorption-desorption. Mechanical properties, namely stiffness and the values of strain and stress at yield point and at break, were determined by stress-strain tests. Six different types of organic coatings were investigated, namely, two emulsion paints, a vinyl toluene acrylic, a polyurethane, a vinyl, and a textured paint. As a result of the leaching process, mechanical properties and properties describing the material characteristics with respect to moisture were affected. These changes were more pronounced in the case of water-borne paints. This means that the results obtained with freshly made paints have to be interpreted cautiously, especially if the aim is to predict the paint durability in practice. In order to make laboratory measurements as relevant as possible to environmental conditions, a number of conditions are proposed.
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