Limewashes with linseed oil and its effect on water and salt transport

0556061 - ÚTAM 2023 RIV CH eng J - Journal Article
Nunes, Cristiana Lara - Mlsnová, Kateřina - Slížková, Zuzana
Limewashes with linseed oil and its effect on water and salt transport.
Buildings. Roč. 12, č. 4 (2022), č. článku 402. E-ISSN 2075-5309
R&D Projects: GA ČR(CZ) GA18-28142S
Institutional support: RVO:68378297
Keywords : lime paint * coating * vegetable oils * capillarity * drying
OECD category: Materials engineering
Impact factor: 3.8, year: 2022
Method of publishing: Open access
https://doi.org/10.3390/buildings12040402

Paints are the protective and aesthetic skin of buildings, so (re) painting is one of the most recurrent maintenance actions. Limewashes have been used since antiquity and are currently of high interest for both conservation and new construction, majorly thanks to their eco-friendly and antiseptic features, and ability to improve the performance of the materials in relation to water transport. Linseed oil is a traditional water-repellent additive that can enhance the water-shedding properties of the limewashes. However, it has the risk of altering the drying kinetics of the substrate if an improper dosage is used. In this work, limewashes with the addition of varying dosages of linseed oil have been applied on two types of natural stone to study the effect of the paints in respect to water and salt transport. The water absorption by capillarity was reduced in both stones coated with pure limewash and limewash with oil, while the drying rate was slightly accelerated. The effect of the paints on the drying of the salt-laden stones varied. The salt damage developed during drying also diverged in both stones, damaging the coats and stone surface of the less porous stone and mainly promoting salt efflorescence in the most porous one.
Permanent Link: http://hdl.handle.net/11104/0330450