Abstract
ABSTRACT The presence of stucco marble in the Portuguese architecture is not surveyed and studies addressing the materials used to produce it are almost inexistent. In this paper, the results of the multi-analytical characterisation using XRD, SEM-EDS, Py-GC/MS and the determination of capillary water absorption and dynamic modulus of elasticity of 15 samples belonging to seven case studies are presented and discussed. XRD showed that gypsum is the main constituent, but anhydrite is also present in most samples. These results were consistent with the observations by SEM-EDS, attesting temperatures of calcination above 350ºC. The use of a multiphase gypsum plaster as a binder was probably intentional. The treatment of the surfaces, which is used to obtain an aesthetical appearance similar to the natural stone, has also a major influence in the main properties of the final materials. The search for organic compounds showed the presence of animal glues in the inner core and beeswax and oils at the surface. The dynamic moduli of elasticity are extremely high in the samples incorporating anhydrite and the capillary water absorption is almost inexistent. The results obtained intend to contribute to promote sustainable interventions on this type of materials, namely the future development of compatible restoration products.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.