Abstract
Gypsum-rich coatings found on buildings constructed with granitic rock ashlars have been studied, from both an urban and a rural area of the NW of Spain. Previous works have attributed gypsum to rock weathering by atmospheric pollution. Mineralogical, chemical, and physical data of coatings have allowed us to distinguish six different types of coatings formed in several ways. In most cases, they are originated by the deterioration calcium-rich plaster building materials. Sulfation of Ca-rich coatings, in situ gypsum dissolution and precipitation, and deposition of air pollution particles are the most important agents related to genesis of coatings. In fact, remains of plasters practically intact were found in some studied buildings. Also, data from coatings and rock ashlars suggest that gypsum-rich coatings are not formed by environment–rock interaction. Coatings located on different parts and façades of the buildings and submitted to different environmental conditions decay in a different way.
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The Centro de Investigação Geológica, Ordenamento e Valorização de Recursos (Universidade do Minho) receives support from Programa de Financiamento Plurianual de Unidades de Investigação of the Portuguese Fundação para a Ciência e a Tecnologia, funded by European Union FEDER and national budget of the Portuguese Republic.
Financial support is from FEDER.
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Sanjurjo Sánchez, J., Alves, C.A.S., Vidal Romaní, J.R. et al. Origin of Gypsum-rich Coatings on Historic Buildings. Water Air Soil Pollut 204, 53–68 (2009). https://doi.org/10.1007/s11270-009-0025-9
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DOI: https://doi.org/10.1007/s11270-009-0025-9