Materiales de Construcción, Vol 70, No 338 (2020)

Adapted ageing tests for the evaluation of alabaster used in the restoration of Bishop’s Palace of Tarazona


https://doi.org/10.3989/mc.2020.08619

R. Bustamante
Universidad Politécnica de Madrid, Escuela Técnica Superior de Arquitectura, Spain
orcid https://orcid.org/0000-0003-0615-9410

P. Vázquez
GEGENAA EA3795, Université de Reims Champagne-Ardenne, France
orcid https://orcid.org/0000-0002-5392-6451

P. Rodríguez-Monteverde
Universidad Politécnica de Madrid, Escuela Técnica Superior de Arquitectura, Spain
orcid https://orcid.org/0000-0002-1477-7836

J. Monjo
Universidad Politécnica de Madrid, Escuela Técnica Superior de Arquitectura, Spain
orcid https://orcid.org/0000-0003-2191-834X

Abstract


The advanced condition of deterioration of the column’s bases of the courtyard of the Bishop’s 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 stagna­tion 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.

Keywords


Gypsum; Decay; Weathering; Petrography; Physical properties

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