Gypsum based mixes for conservation purposes: evaluation of microstructural and mechanical features

Authors

DOI:

https://doi.org/10.3989/mc.2020.05019

Keywords:

Gypsum, Magnesium oxide, Compressive strength, Pore size distribution, Microstructure

Abstract


This paper presents the study of four gypsum mixtures, focusing on the role of both inorganic and organic additives and on the micro-structural features and mechanical properties. Additives have been chosen among those most reported in historical recipes, for example magnesia, lime putty, rabbit glue. The selected mixes refer to gypsum-based materials used in artworks manufacture, such as plasters, mouldings, stuccoworks, pastiglia. Blank reference materials were prepared on purpose according to the specific recipe, in order to verify the final composition and to highlight the hardening mechanisms and the formation of setting compounds. The chemical composition was related to workability properties and final mechanical resistance and the action of additives as retardants was studied with interesting results. For instance, MgO imparts good properties to the mechanical features, especially with regard to the compressive strength characteristics.

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Published

2020-03-30

How to Cite

Brunello, V., Bersani, D., Rampazzi, L., Sansonetti, A., & Tedeschi, C. (2020). Gypsum based mixes for conservation purposes: evaluation of microstructural and mechanical features. Materiales De Construcción, 70(337), e207. https://doi.org/10.3989/mc.2020.05019

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Research Articles