1 research outputs found
Ensayos de envejecimiento adaptados a la evaluaci贸n del alabastro de la restauraci贸n del Palacio Episcopal de Tarazona
The advanced condition of deterioration of the column鈥檚 bases of the courtyard of the Bishop鈥檚 Palace of Tarazona (Spain) built in the middle of 16th century required its restoration with Aragonese alabaster. Thus, adapted ageing tests were developed to simulate the environmental conditions in which the stones were and will be exposed. These tests were thermal fatigue by temperature variations, acid rain and water stagna颅tion by immersion tests and a combination of both agents of decay. The results indicated that alabaster did not experimented deformation after thermal fatigue but a progressive dehydration to bassanite. This process entailed an increase of porosity and consequently a loss of structural properties. The dissolution was measured as a lineal weight and volume loss while porosity and capillary uptake remained stable. The conclusions of this study establish the importance of restoration protocols to maintain the alabaster integrity when used and exposed to rainwater and insolation.Las basas deterioradas de las columnas del patio del Palacio Episcopal de Tarazona (Espa帽a), construido a mediados del siglo XVI, fueron restauradas con alabastro aragon茅s. Por lo tanto, se han desarrollado pruebas de envejecimiento adaptadas para simular las condiciones ambientales en las que las piedras estaban y estar谩n expuestas, fatiga t茅rmica por variaciones de temperatura, lluvia 谩cida, inmersi贸n en agua y una combinaci贸n de agentes de deterioro. Los resultados indican que el alabastro no experiment贸 deformaci贸n despu茅s de la fatiga t茅rmica, sino una progresiva deshidrataci贸n a bassanita, lo cual implica un aumento de porosidad y una p茅rdida de propiedades estructurales. La disoluci贸n se midi贸 como una p茅rdida lineal de peso y volumen, mientras que la porosidad y el ascenso capilar se mantuvieron estables. Se desprende la importancia de adoptar protocolos de restauraci贸n para mantener la integridad del alabastro cuando se expone al agua de lluvia e insolaci贸n