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The different effect of two paint systems on moisture buffer capacity of traditional and modern plasters
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Resumo(s)
Plasters can be finished with paint systems that can affect their moisture storage and transport properties. To confirm that, eight traditional and modern plastering mortars and pastes – based on cement, natural hydraulic lime, air lime, earth and gypsum - were coated with a vinyl paint (A) and an acrylic paint (B) and underwent the same hygroscopic characterization of the bare mortar samples. The effect of paint system A on water vapor adsorption and moisture buffering was small, in some cases positive. However, all the plasters painted with system A showed lower water vapor permeability than the bare plasters. The variation in the thickness of equivalent air layer was not the same for all the plastering mortars and pastes, suggesting that the different plastering substrates were still involved in the hygroscopic mechanism. The application of paint system B, instead, significantly reduced the hygroscopic behavior of the plasters, leveling their responses. The two paints, produced for different scopes and so with different kind and contents of constituents, have a diverse effect on those properties. Therefore, to optimize the passive contribution that plasters may have to indoor comfort, it is important to make a conscious choice when choosing paint finishing systems.
Descrição
The authors would like to thank the National Laboratory for Civil Engineering of Portugal (LNEC) for the laboratory equipment and the support provided through the projects REuSE - Wall coverings for Rehabilitation: Safety and Sustainability and RevBar \u2013 Polymeric based barrier coatings: functionality and sustainability.
Publisher Copyright:
© 2024 Elsevier Ltd
Palavras-chave
Acrylic paint Coating Moisture buffer Vinyl paint Water vapor permeability Civil and Structural Engineering Architecture Building and Construction Safety, Risk, Reliability and Quality Mechanics of Materials