Identificación de taumasita asociada a la restauración de la Iglesia de San Andrés de Calatayud (Zaragoza). Condiciones de formación y de preparación de las muestras
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Fecha
2019Materia/s
Materia/s Unesco
Resumen
This study, achieved at the underground of the baptismal chapel of the San Andrés church (Calatayud), has permitted to identify that the observed convex deformations appearing after its restoration are due to the formation of thaumasite. The formation of this complex salt requires carbonate, sulphate, silicate and calcium supply, a temperature below 15°C and a high humidity environment. These factors have produced the crystallization of thaumasite that has led to the mortar deterioration and the appearing of expansive processes two years after the chapel restoration. The thaumasite identification has been carried out by X-ray difractometry and SEM on samples naturally dried at ambient temperature. Moreover, it has been observed that the lab routine with an 80°C oven interferes in the mineralogical characterization because it practically destroys thaumasite decomposing it in simpler salts. The presence of thaumasite in the mortars employed for the restoration, in this case sulfate-resistant, confirms the interest in the previous constructive and geological environment analyses for the design of the restoration used materials. © 2019 Sociedad Geologica de Espana. All rights reserved.
This study, achieved at the underground of the baptismal chapel of the San Andrés church (Calatayud), has permitted to identify that the observed convex deformations appearing after its restoration are due to the formation of thaumasite. The formation of this complex salt requires carbonate, sulphate, silicate and calcium supply, a temperature below 15°C and a high humidity environment. These factors have produced the crystallization of thaumasite that has led to the mortar deterioration and the appearing of expansive processes two years after the chapel restoration. The thaumasite identification has been carried out by X-ray difractometry and SEM on samples naturally dried at ambient temperature. Moreover, it has been observed that the lab routine with an 80°C oven interferes in the mineralogical characterization because it practically destroys thaumasite decomposing it in simpler salts. The presence of thaumasite in the mortars employed for the restoration, in this case sulfate-resistant, confirms the interest in the previous constructive and geological environment analyses for the design of the restoration used materials. © 2019 Sociedad Geologica de Espana. All rights reserved.
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