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Study of the degradation causes affecting stucco sculptures from the Valentino Castle in Turin

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Abstract

17th century stuccos located in The Valentino Castle in Turin (Northern Italy) have been studied by means of XRD, TG-DTA, Hg porosimetry and SEM coupled with EDX chemical analysis in order to understand their composition and the degradation causes. The investigated un-degraded samples were made of gypsum, hydrated lime and other carbonates phases on the external surface and up to ca. 20 mm in depth but the compositions were highly heterogeneous. Repeated cycles of water impregnation, coming from roofing infiltration, and evaporation have reached the investigated area and led to severe damages to stuccos due to crystallization of hydrated magnesium sulphate salts.

Résumé

Des stucs du XVIIe siècle sintués dans le Château du Valentino (Turin, Italie) ont été analysés par diffraction des rayons X. ATG/ATD, porosimétrie à mercure et microscopie électronique à balayage avec microanalyse EDX, pour en étudier la composition et les causes qui ont conduit à leur endommagement. L'étude des décorations intactes a montré que celles-ci ont été réalisée à base de liants aériens en surface et jusqu'à une profondeur de 20 mm, mais les compositions de différents échantillons ne sont pas du tout homogènes. Des cycles successifs d'imprégnations et d'évaporation d'eau, suite à des infiltrations répétées provenant du toit, ont sévèrement dégradé les décoration à cause de la cristallisation de sels de sulfate de magnésium.

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Authors and Affiliations

  1. Materials Science Dept., Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129, Turin, Italy

    J. -M. Tulliani

  2. Faculty of Architecture, Architectural and Urban Design Dept., Politecnico di Torino, Viale Mattioli, 39, 10125, Turin, Italy

    C. Bertolini Cestari

Authors
  1. J. -M. Tulliani
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  2. C. Bertolini Cestari
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Editorial note Prof. Clara Bertolini Cestari is a RILEM Senior Member.

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Tulliani, J.M., Cestari, C.B. Study of the degradation causes affecting stucco sculptures from the Valentino Castle in Turin. Mat. Struct. 38, 425–432 (2005). https://doi.org/10.1007/BF02479311

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  • DOI: https://doi.org/10.1007/BF02479311

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