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Title

Evolution of surface properties of ornamental granitoids exposed to high temperatures

AuthorsVázquez, Patricia; Acuña, Marta; Benavente, David; Gibeaux, Soizic; Gómez-Heras, Miguel
KeywordsGranites
Building stone
High temperature
Fire
XPS
Roughness
Colour
Issue Date1-Feb-2016
PublisherElsevier
CitationConstruction and Building Materials 104: 263-275 (2016)
AbstractGranite submitted to high temperatures may lead to the loss of aesthetic values even before structural damage is caused. Thirteen granitoids were exposed to target temperatures, 200 °C, 400 °C, 600 °C, 800 °C and 1000 °C. Damage characterisation, including roughness, colour and oxidation of chromogen elements by means of X-ray photoelectron spectroscopy (XPS) was assessed. Altered granitoids are more resistant to structural failure but redden rapidly. Black mica-rich granitoids turn into yellow with a maximum at 800 °C. Alkali feldspar-rich granitoids redden progressively due to iron oxidation. Roughness varies progressively in mica-rich granitoids, while in mica-poor granitoids, an increase in roughness precedes catastrophic failure.
Publisher version (URL)https://doi.org/10.1016/j.conbuildmat.2015.12.051
URIhttp://hdl.handle.net/10261/184341
DOI10.1016/j.conbuildmat.2015.12.051
ISSN0950-0618
Appears in Collections:(IGEO) Artículos
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