Laboratory assessment of a photoactive Gypsum-based repair plaster

[Display omitted] •Photoactive repair plaster based on CaSO4·½H2O and TiO2 is described.•TiO2 admixture did not affect flexural strength of the specimens.•TiO2 had a slight impact on porosity, and, consequently, on compressive strength of the specimens.•Good results have been obtained for NO photode...

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Bibliographic Details
Published inConstruction & building materials Vol. 346; p. 128426
Main Authors Svorová Pawełkowicz, Sylwia, Svora, Petr, Prošek, Zdeněk, Keppert, Martin, Vejmelková, Eva, Murafa, Natalija, Sawoszczuk, Tomasz, Syguła–Cholewińska, Justyna, Bíbová, Hana
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 05.09.2022
Subjects
Gypsum
Photoactivity
Repair plaster
Titanium dioxide
Gypsum
Repair plaster
Titanium dioxide
Photoactivity
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Summary:[Display omitted] •Photoactive repair plaster based on CaSO4·½H2O and TiO2 is described.•TiO2 admixture did not affect flexural strength of the specimens.•TiO2 had a slight impact on porosity, and, consequently, on compressive strength of the specimens.•Good results have been obtained for NO photodegradation.•The studied repair plasters showed no antimicrobial activity. 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 concentrations 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 gypsum/TiO2 repair plaster can be an effective solution for historical monuments struggling with high air pollution.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2022.128426