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- W22361808 abstract "Under natural acid and wet conditions, one of the main weathering processes affecting granitic rocks is the kaolinization of Na, Ca, and K feldspar minerals by water (H 2 0) and carbon dioxide (CO 2 ) attack. The gypsum crystallisation on granitic building stone surfaces is attributed to SO 2 air pollution. This chapter describes the study wherein scanning electron microscopy (SEM) with energy-dispersive spectroscopy (EDS) and fourier-transform infrared spectroscopy (FT-IR) have been combined to analyze the weathering products and decay processes on the surface patinas of the S. Jorge church. It focuses on the research to assess the role of SO 2 from air pollution for the onset of chemical weathering reactions in feldspars and corrosion of granitic building stones. The presence of kaolinite in S. Jorge church samples is because of surface weathering of granitic building stone that occurred after the emplacement of the stone in the cathedral. Kaolinization affect both mica and feldspar minerals. The absence of biotite and the accessory nature of muscovite in the granite used in the building of S. Jorge suggests that feldspars are the most likely reactants in the kaolinisation reaction. SO 2 air pollution in a humid climate is responsible for direct silicate weathering via heterogeneous attack of feldspars either by the aeriform mixture adsorbed at the surface of the granite walls or by SO 2 (aq) in aqueous solution. The chemical and mineralogical transformation from aluminosilicate to basic silicate of aluminum through the corrosion mechanism leads to important physical changes and significant weakening of the stone surface. The presence of minor kaolinite in well cemented quartz sandstones is known to be responsible for a decrease in the compression strength and bulk density of the building stones. Kaolinisation of feldspars by SO 2 action acts together with gypsum crystallization to promote loss of cohesion and spalling or flaking of the stone surface." @default.
- W22361808 created "2016-06-24" @default.
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- W22361808 date "2000-01-01" @default.
- W22361808 modified "2023-09-25" @default.
- W22361808 title "Granitic building stone decay in an urban environment" @default.
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- W22361808 doi "https://doi.org/10.1016/b978-044450517-0/50124-0" @default.
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