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Suitability of different paint coatings for renders based on natural hydraulic lime

Author(s): Ana Paula Ferreira Pinto, Hugo Passinhas, Augusto Gomes, Bruna Silva
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference
Materials, Systems and Structures in Civil Engineering 2016 segment on
Historical Masonry
Editor(s): Inge Rörig-Dalgaard and Ioannis Ioannou
ISBN: 978-2-35158-178-0
e-ISBN: 978-2-35158-179-7
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 188-197
Total Pages: 10
Language : English

Abstract: The paper intends to evaluate the behaviour of different paint coatings when applied on renders
based on natural hydraulic lime and, thus, to aid in the selection of adequate paint solutions to
be used in conservation interventions. For that, tests were performed on painted and unpainted
specimens of hydraulic lime mortar and of blended lime putty-natural hydraulic lime mortar.
Five different paint coatings were used: a limewash, a modified limewash with a commercial
additive, two silicate paints and an acrylic emulsion paint (plastic paint). Results showed that
the blended mortar was more influenced by the paint solutions than the natural hydraulic lime
mortar. The limewashes proved to be the most suitable solutions for the tested mortars. The two
silicate paints promoted quite different alterations on the mortars, which is indicative of the
diversity of silicate paints available on the market. The plastic paint did not significantly alter
the water absorption by capillarity nor the drying kinetics of the tested mortars, but somewhat
hindered the water vapour permeability, and hence should be carefully considered.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00

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