Ancient gypsum mortars from Sta. María Magdalena church (Zaragoza, Spain): advances in technological manufacture

Abstract eng:
Gypsum mortars were very commonly used during the Mudejar artistic period in Spain from the 12th to 16th century. The region of Aragon is one of the most important centres of Mudejar architecture in the country, and the church of Sta. Maria Magdalena sited in Zaragoza, is a particularly authentic example of this artistic style of construction. The research has been carried out by selecting a group of representative and unaltered samples from original joint mortars. The characterization of different mortars was made using Fourier-transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Differential thermalthermogravimetric analysis (DTA-TGA). In this paper, the results reveal that all mortars analysed display homogeneous composition in the different sampling areas from the monument. The main component of the samples is gypsum. In addition, different hypotheses are established about technological procedure and the type of raw materials used.

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