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Valutazione dei parametri petrofisici del Tufo giallo napoletano e della Pietra di Vicenza: indagini sperimentali finalizzate al recupero ed alla conservazione di materiali macroporosi

Di Benedetto, Claudia (2012) Valutazione dei parametri petrofisici del Tufo giallo napoletano e della Pietra di Vicenza: indagini sperimentali finalizzate al recupero ed alla conservazione di materiali macroporosi. Doctoral Thesis.

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Abstract

In the recent years the awareness of having an architectural heritage, rich but "fragile", produced a greater effort in order to preserve the building stones and/or improve their resistance to weathering. Aim of this research is the testing of two commercial product: an anti-hygro, a protective product which reduces the swelling ability of clay and zeolitic minerals and a polymeric consolidant (ethyl silicate) applied to Neapolitan Yellow Tuff (TGN), the oldest building material in the Naples area. Moreover, in order to better evaluate the mechanisms of stone consolidation, it was selected, for comparison, a porous sedimentary rock, Pietra di Vicenza, with a pore radii distribution similar to TGN. The two stones were saturated by immersion under laboratory conditions. Specimens were divided into test group: untreated, treated with consolidant and treated with antihygro and consolidant. Investigations were conducted before and after each treatment and included mineralogical and petrographic analyses (XRD, XRF, SEM), physical and mechanical determinations (porosity, pore radii distribution, capillarity absorption, water absorption (by immersion), ultrasonic wave velocity measurements, compressive strength, colorimetric measurements). Furthermore consolidated samples were subjected to ageing tests such as freeze-thaw cycles, salt crystallization tests and salt spray; in order to evaluate and measure the effectiveness of consolidation and to study changes in stone properties.

Item Type:Doctoral Thesis
ID Code:6676
Contributors:Cappelletti, Piergiulio
Publisher:Università degli studi di Sassari
Uncontrolled Keywords:Tufo giallo napoletano, Pietra di Vicenza, durability, weathering, consolidation
Subjects:Area 04 - Scienze della terra > GEO/09 Georisorse minerarie e applicazioni mineralogico- petrografiche per l'ambiente ed i beni culturali
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze botaniche, ecologiche e geologiche
Cicli, scuole e corsi:Ciclo 24 > Scuole > Scienze della natura e delle sue risorse > Scienza e tecnologia dei minerali e delle rocce di interesse industriale
Deposited On:28 Mar 2012 10:40

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