Academic thesis
| Julia Tilkorn: | Salt reduction on coated architectural surfaces | Back |
| Language: | Original - Translation | |
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| Abstract: | In order to minimise the damage mechanisms of salts in porous stone objects and on architectural surfaces, poultices are usually used in restoration. These are based on the principle of displacing salts into the poultice by means of a directed flow of moisture. If this process is hindered by an impermeable coating on the porous substrate, other methods of salt reduction must be used. This work examines whether it is possible to reduce salt by applying salt reduction poultices via lacunae in the coating and/or whether there is a possible redistribution or accumulation of soluble salts, which may then lead to further damage under the coating. The tests are carried out on test plates of Maastricht limestone, which are loaded with the salt sodium chloride. The tops of the test plates are coated with acrylic dispersion 4 and the salt reduction using compresses is carried out via a defined defect in the coating that is kept free. Conductivity measurements on eluates from compresses and drill dust samples before and after salt reduction reveal a reduction in salts in the vicinity of the defect. Furthermore, there is a tendency for salts to be displaced to the areas further out due to the high water input. For conservation practice, these results indicate that the method used may be able to reduce salts in the vicinity of a defect, so that this area can be protected by conservation measures and protected from further damage. |
| Keywords: | Salt reduction; film-forming coating; poultieces; tests on test plates |
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| Contact: |
Julia Tilkorn ju.gunnekorn@[Diesen Teil loeschen]gmx.de |
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