Materiales de Construcción, Vol 70, No 337 (2020)

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


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

V. Brunello
Dipartimento di Scienza ed Alta Tecnologia (DISAT), Università degli Studi dell’Insubria, Italy
orcid https://orcid.org/0000-0001-9789-7245

D. Bersani
Dipartimento di Scienze Matematiche, Fisiche e Informatiche, University of Parma, Italy
orcid https://orcid.org/0000-0002-8026-983X

L. Rampazzi
Istituto di Scienze del Patrimonio Culturale (ISPC-CNR) - Politecnico di Milano, Dipartimento di Ingegneria Civile e Ambientale (DICA), Italy
orcid https://orcid.org/0000-0002-7032-8955

A. Sansonetti
Istituto di Scienze del Patrimonio Culturale (ISPC-CNR), Italy
orcid https://orcid.org/0000-0003-4938-1417

C. Tedeschi
Politecnico di Milano, Dipartimento di Ingegneria Civile e Ambientale (DICA), Italy
orcid https://orcid.org/0000-0002-1718-1632

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.

Keywords


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

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References


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