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    Laboratory assessment of a photoactive Gypsum-based repair plaster

    Year: 2022

    Journal: Constr. Build. Mater., Volume 346, SEP 5

    Authors: Pawelkowicz, Sylwia Svorova; Svora, Petr; Prosek, Zdenek; Keppert, Martin; Vejmelkova, Eva; Murafa, Natalija; Sawoszczuk, Tomasz; Sygula-Cholewinska, Justyna; Bibova, Hana

    Organizations: Czech Science Foundation [GA18-26297S]; Research Infrastructures NanoEnviCz and CzechNanoLab - Ministry of Education, Youth and Sports of the Czech Republic (MEYS CR) [LM2018124, LM2018110]

    Keywords: Gypsum; Titanium dioxide; Photoactivity; Repair plaster

    Air pollutants, such as nitrogen oxides (NO and NO2), have a negative impact on the built cultural heritage. In order to reduce it, a photoactive repair plaster for conservation of various gypsum decorations, in particular moulded elements, has been developed in compliance with the requirements of conservators-restorers international community. Hence, the composition of the repair plaster is based on traditional materials (plaster of Paris) with the admixture of a modern material - photoactive titanium dioxide (TiO2) in different weight concentra-tions 0.5 %, 1 %, 1.5 %, 2 %. The paper presents the results of mechanical, photoactivity and microbiological tests along with the phase analysis and a study of the microstructure of the repair plaster specimens. Several analytical techniques were applied to characterize them, such as X-ray powder diffraction (XRD) and electron microscopy (SEM, TEM) coupled with energy dispersive X-ray spectroscopy (EDS). The results show that gyp-sum/TiO2 repair plaster can be an effective solution for historical monuments struggling with high air pollution.
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