New Studies on the Characterization of Facing Wall Decay; The Case of Santa Maria delle Grazie al Calcinaio Church
Pietro Matracchi, Carlo Alberto Garzonio, Fabio Radicioni, Elena Pecchioni, Teresa Salvatici, Isabella Seghi & Grazia TosiReferences
Abstract

The study aimed to document the state of conservation and to interpret the alteration processes of the facing wall on the Santa Maria delle Grazie al Calcinaio church. The masonry built by ashlar is affected by severe decay phenomena, which in a few years could lead to the almost complete cancellation of the finishing traces in the surface of the ashlars and the significant loss of the architectural decoration. In this paper, a specific aspect of degradation was considered. It concerns the widespread detachment phenomena of material, thin slabs of different thicknesses, from the surface of the ashlars. It is a degradation with very peculiar characteristics, as it cannot be assimilated to the sandstones degradation processes usually taken into consideration. It is a form of degradation to be interpreted in diagnostic terms and to be understood in the operational implications regarding possible conservation interventions. The widespread traces of thin layers of lime-based mortar existing in the facade are another salient aspect, which would suggest a protective finish extended to the entire walls. If this hypothesis were confirmed, it would document a completely different original character compared to the image of the church established over time. In order to clarify the questions that raise these two issues, an articulated laboratory investigation program, still in progress, was launched. Some part of first results of the research are illustrated in this contribution.

Keywords
construction; conservation; decay of the sandstone; laser scanner survey; Renaissance.

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Subjects: Engineering 

Language: English

Publisher: Manashahran Institute for Strategic Research

EISSN: 2588-6770

Email: info.ojest@gmail.com

 

Online Journal of Engineering Sciences and Technologies