Clay minerals in historic buildings |
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Authors: | Veridiana Reyes-Zamudio Carlos Angeles-Chávez Jorge Cervantes |
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Institution: | 1.Departamento de Química, D.C.N.E.,Universidad de Guanajuato,Guanajuato,Mexico;2.Instituto Mexicano del Petróleo,Mexico City,Mexico |
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Abstract: | Although identified in heritage stones, clays are not always taken into full account in terms of negative effects due to their
swelling ability (Delgado Rodrigues, Materiales de Construcción 51:183–195, 2001). The main purpose of this study is to identify clays in welded tuffs of three different historic monuments located in the
city of Guanajuato, Mexico, and to establish the clays’ contribution to the deterioration of the monuments by their swelling
behavior. Thermal analysis, differential thermal analysis (DTA), thermogravimetry (TG), and dynamic mechanical analysis (DMA),
as well as supplementing data with X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and environmental
scanning electron microscopy (ESEM), have been used. Data suggest that clays present in welded tuffs of the historic monuments
studied contribute to increased deterioration through osmotic swelling in two of the three monuments. |
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