Abstract
Limewashes have been used as finishing coats for walls since ancient times. Its protective, aesthetic, antiseptic properties and cost-efficiency are the ground for its worldwide application. The main drawback of lime-based paints is their low durability towards the action of water, particularly wind-driven rain. Additives that grant water-repellent properties have been added to these paints to overcome this issue. Among these additives, vegetable oils have been reported worldwide in ancient documents. In this work, three vegetable oils have been selected based on their composition and promising results in previous studies, global availability, and cost-efficiency: rapeseed, sunflower, and sunflower oil with high oleic acid content. Additionally, a commercial water-repellent lime putty with the addition of olive oil was included to prepare a limewash and compare it with the lab-prepared paints. Two types of stone with very different porous structures were used as substrates to compare the effect of the paints on their water transport properties. The substrate with higher porosity and wider pores showed promising results in terms of water-repellence and drying. In contrast, the stone with lower porosity and fine pores did not show good results. Based on this study, suggestions for further research to improve the performance of the paints in substrates with low porosity and narrow pore size distribution are given.
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Acknowledgements
This research study was funded by the Czech Science Foundation (GAČR) grant reference 18-28142S, and by the project Human Resources Development of the Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences no. CZ.02.2.69/0.0/0.0/18_053/0016918. The authors are grateful for the Foundation for Science and Technology’s support via funding UIDB/04625/2020 from the CERIS research unit.
The authors thank Eng. Marina Reis from Sovena Oilseeds Portugal for kindly providing the vegetable oils and their composition, and Mr. João Melo from Fradical – Fábrica de Transformação de Cal (Portugal) for kindly providing the water-repellent Fradical lime putty used in this study.
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Nunes, C., Faria, P., Garcia, N. (2023). Limewashes with Vegetable Oils: Water Transport Characterisation. In: Bokan Bosiljkov, V., Padovnik, A., Turk, T. (eds) Conservation and Restoration of Historic Mortars and Masonry Structures. HMC 2022. RILEM Bookseries, vol 42. Springer, Cham. https://doi.org/10.1007/978-3-031-31472-8_12
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