Setting process of lime-based conservation mortars with barium hydroxide |
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Authors: | Ioannis Karatasios Vassilis Kilikoglou Panagiotis Theoulakis |
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Affiliation: | a Institute of Materials Science, NCSR Demokritos, Aghia Paraskevi, 153 10 Athens, Greece b Department of Forensic and Biomedical Sciences, University of Lincoln, Lincoln, LN6 7TS, UK c Department of Conservation of Antiquities and Works of Art, TEI of Athens, Athens, 122 10, Greece d Hutton + Rostron Environmental Investigations Limited/Centre for Sustainable Heritage, University College London, UK |
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Abstract: | This paper presents the effect of barium hydroxide on the setting mechanism of lime-based conservation mortars, when used as an additive material. The study focuses on the monitoring of the setting process and the identification of the mineral phases formed, which are essential for furthering the study of the durability of barium mixtures against chemical degradation. X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and thermal analysis (DTA-TG) were used to monitor the setting processes of these mixtures and identify new phases formed. The results suggest that barium hydroxide is evenly distributed within the lime and produces a homogeneous binding material, consisting of calcite (CaCO3), witherite (BaCO3) and barium-calcium carbonate BaCa(CO3)2]. Finally, it was found that barium carbonate can be directly bonded to calcitic aggregates and therefore increases its chemical compatibility with the binding material. |
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Keywords: | Barium hydroxide Setting Repair conservation Lime-based mortars |
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