Assessment of Water Repellent Treatments for the Stone of the Matera Cathedral Facade (Italy)
| Autor: | Barbara Sacchi, Silvia Vettori, Laura Rampazzi, Maria Perla Colombini, Alessia Andreotti, Piero Tiano |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Acrylic resins
Visual Arts and Performing Arts media_common.quotation_subject 0211 other engineering and technologies 020101 civil engineering durability evaluation protective efficacy siloxanes stone conservation 02 engineering and technology Conservation Art Unesco world heritage Archaeology 0201 civil engineering Work (electrical) Water repellent 021105 building & construction Architecture Facade media_common |
| Zdroj: | International journal of architectural heritage (2020). doi:10.1080/15583058.2020.1782532 info:cnr-pdr/source/autori:Sacchi B.; Vettori S.; Andreotti A.; Rampazzi L.; Colombini M.P.; Tiano P./titolo:Assessment of Water Repellent Treatments for the Stone of the Matera Cathedral Facade (Italy)/doi:10.1080%2F15583058.2020.1782532/rivista:International journal of architectural heritage/anno:2020/pagina_da:/pagina_a:/intervallo_pagine:/volume |
| ISSN: | 1558-3066 1558-3058 |
| Popis: | After the cleaning procedures carried out during a recent restoration work, the Matera Cathedral's (UNESCO World Heritage Site) facade needed the application of a water repellent treatment. Aqueous emulsions of silanes/siloxanes, also in a mixture with acrylic polymer and an alkyl/alkoxysilanic resin (by BEL CHIMICA S.r.l. and PHASE restauro S.r.l), have been tested as representative of the most used formulations in the restoration of buildings in Italy, especially in the last decade. This paper focuses on the best practices to be adopted for the identification of the suitable protective product in terms of effectiveness, harmfulness and durability, in particular respect to photo-aging and thermo-hygrometrical aging. The conservation materials have been testedin situand in laboratory on a stone block expressly extracted from the monument. The chemical composition of the products and their degradation processes were characterized by means of FT-IR and PY-GC-MS. The performance of the treatments was evaluated, both in laboratory by permeability, color and capillarity measurements and in situ by non-destructive techniques (IR reflectance spectroscopy, color measurements, water absorption tests by contact sponge). Silane/siloxane emulsion presented more pronounced degradation phenomena after artificial aging, while the mixture of silanes/siloxanes and acrylic polymers decreased the permeability to water vapour. |
| Databáze: | OpenAIRE |
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