Problemi conservativi dei materiali impiegati per la costruzione di Ponte Sisto: alcune considerazioni
Abstract
The bridge materials consist of travertine, bricks, and iron with two marble plaques bearing inscriptions. Their smooth, non-sculptured surfaces present no visible sign of fissures or serious lesions apart from extensive rust spots where the corroded iron elements have leached ferrous salts into the stone beneath them. A dark patina covers every surface not exposed to the washing action of rain; there is a dangerous growth of vegetation at some points. The bridge supports that are not covered with a facing of travertine show a saline efflorescence due to the capillary action of the river waters. The two marble plaques show signs of advanced decomposition and past attempts at repair. Before cleaning, the authors recommend treating the iron parts to stop the oxidation and using the gelatinous solvents specifically designed for the materials; the marble needs to be consolidated prior to cleaning. to treat the three observed kinds of iron elements, a chemical and metallographic analysis of samples is recommended. as a number of metallic structural supports are disjointed or missing, an eventual restoration will be a complex and delicate task, which should end, after cleaning and rebuilding, with applying layers of minium-based varnish and regular varnish. - AATA
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