Alteration of monuments and historical buildings has recently undergone to an important acceleration due to natural and anthropic changes in the climatic conditions and presently it has grown to a particularly evident degree. The rate of decay depends on intrinsic properties of the stone (mineralogical composition, stone texture and structure, porosity, etc.) but also on extrinsic factors that include climatic conditions, atmospheric composition, localization of the object, use and care given to it, and so on. The deterioration of stone materials occurs even in the absence of pollutants and it is important to quantify how natural or anthropic factors affect and accelerate the degradation of the material. Atmospheric conditions in urban areas, mainly due to air pollution, greatly promote decay processes of stone materials, especially for those outdoor exposed. Damage of cultural heritage coming from air pollution has two main sources: pollutant gases improve the corrosivity of the atmosphere (acid rains) and black particles deposited on the surface cause a darkening of the surface itself. In recent years several studies have been developed with the purpose of setting up appropriate protective able to reduce the ruinous effects of the atmospheric pollution in combination with the change of the climatic parameters. It’s well known that almost all of these phenomena require the presence of water for their action or the water may strongly improve their influence. A variety of efforts have been undertaken over the years to preserve or protect these structures and in particular protective agents have been selected from commercial products developed for the protection of the surface of civil buildings. These materials however do not satisfy the requirements for they application on historic or artistic stones so new and specific materials are proposed. An evaluation of the state of art of polymers employed for this special application is reported examining the requirements of the products for their use as protective for cultural heritage, their performance, stability and the class of protective polymers employed up to now. A final paragraph is dedicated to new trends in development of polymers coming from natural sources.
Deterioration and Protection of Hystoric and Artistic Stone: The role of synthetic polymers / B. Sacchi; I. Malesci; L. Rosi; M. Frediani; G. Giuntoli; A. Pedna; P. Frediani. - STAMPA. - (2013), pp. 41-90.
Deterioration and Protection of Hystoric and Artistic Stone: The role of synthetic polymers
ROSI, LUCA;FREDIANI, MARCO;GIUNTOLI, GIULIA;FREDIANI, PIERO
2013
Abstract
Alteration of monuments and historical buildings has recently undergone to an important acceleration due to natural and anthropic changes in the climatic conditions and presently it has grown to a particularly evident degree. The rate of decay depends on intrinsic properties of the stone (mineralogical composition, stone texture and structure, porosity, etc.) but also on extrinsic factors that include climatic conditions, atmospheric composition, localization of the object, use and care given to it, and so on. The deterioration of stone materials occurs even in the absence of pollutants and it is important to quantify how natural or anthropic factors affect and accelerate the degradation of the material. Atmospheric conditions in urban areas, mainly due to air pollution, greatly promote decay processes of stone materials, especially for those outdoor exposed. Damage of cultural heritage coming from air pollution has two main sources: pollutant gases improve the corrosivity of the atmosphere (acid rains) and black particles deposited on the surface cause a darkening of the surface itself. In recent years several studies have been developed with the purpose of setting up appropriate protective able to reduce the ruinous effects of the atmospheric pollution in combination with the change of the climatic parameters. It’s well known that almost all of these phenomena require the presence of water for their action or the water may strongly improve their influence. A variety of efforts have been undertaken over the years to preserve or protect these structures and in particular protective agents have been selected from commercial products developed for the protection of the surface of civil buildings. These materials however do not satisfy the requirements for they application on historic or artistic stones so new and specific materials are proposed. An evaluation of the state of art of polymers employed for this special application is reported examining the requirements of the products for their use as protective for cultural heritage, their performance, stability and the class of protective polymers employed up to now. A final paragraph is dedicated to new trends in development of polymers coming from natural sources.File | Dimensione | Formato | |
---|---|---|---|
2013_NovaPubl_Chapt17785.pdf
Accesso chiuso
Tipologia:
Versione finale referata (Postprint, Accepted manuscript)
Licenza:
Tutti i diritti riservati
Dimensione
1.97 MB
Formato
Adobe PDF
|
1.97 MB | Adobe PDF | Richiedi una copia |
I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.