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Resumo(s)
In this study we aimed to determine the mechanisms of deterioration of the wall covering used in the construction of the Basilica of St Augustine in Annaba in Algeria. The wall coating is regarded as the outer skin of any construction, therefore most exposed to external aggression of environment especially if the latter is polluted. To determine the degree of deterioration of the wall covering with respect to its composition chemical and mineralogical, laboratory analysis (dry weight of the unit, water absorption, effective porosity, SEM imaging, X-ray spectrometry, microbiological analysis) were performed on samples taken from the building, these were supplemented by observations on site. The main cause of the observed deterioration is due to significant pollution presence of sodium chloride, its presence is particularly localized in an area rich in calcium carbonate. The porosity is locally very important, form of interconnected vacuoles. Thereof constitute a plane of
weakness and may partially explain the uniform appearance of the coating.
Descrição
Palavras-chave
Basilica of St Augustine Air pollution Wall covering Degradation
Contexto Educativo
Citação
Gheris Abderrahim, João C.G. Lanzinha, 12.01 “CONSEQUENCE OF THE ATMOSPHERIC POLLUTION ON THE DEGRADATION TO THE COATING FACING OF THE BASILICA OF SAINT AUGUSTINE IN ANNABA ALGERIA”, in proceedings of ICEUBI2017 – International Congress on Engineering – “A Vision for the Future”; http://iceubi.ubi.pt/wp-content/uploads/2019/01/ICEUBI2017.livrodeproceedings.pdf, ISBN 978-989-654-403-4 (book of proceedings), ISBN 978-989-654-405-8 (USB Pen drive); ISBN: 978-989-654-402-7 (book of abstracts), Faculty of Engineering, University of Beira Interior, Covilhã, Portugal, 5-7 Dec 17