EFEITOS DOS POLUENTES ATMOSFÉRICOS SOBRE PLACAS DE ROCHAS CARBONÁTICAS NOS REVESTIMENTOS DE EDIFICAÇÕES EM REGIÃO LITORÂNEA DO RECIFE - PE/EFFECTS OF AIR POLLUTANTS ON CARBONATE ROCKS PLATES IN CLADDINGS OF BUILDINGS IN THE COASTAL REGION OF RECIFE - PE

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Detalles Bibliográficos
Publicado en:	HOLOS vol. 30, no. 6 (2014), p. 45-55
Autor principal:	Da Silva, S A
Otros Autores:	Oliveira, F M C, Menor, E Albuquerque, Melo, E B, Neto, J A Nogueira
Publicado:	Instituto Federal de Educacao Ciencia e Tecnologia do Rio Grande do Norte
Acceso en línea:	Citation/Abstract Full Text Full Text - PDF
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Descripción
Resumen:	Particulates and/or aerosols are harmful pollutants to cladding rocks. They are a mixture of very small particles dispersed in the atmosphere in the form of liquid or solid and may be product from the nebulization of liquid or solid substances or condensation from the gaseous phase (burning fossil fuels, etc). Fluxes of heat and vapor between the atmosphere and the rock favor or impede the deposit on the surface of particles and gases, they enter the interior of rocks, which facilitate migration of salts, formation of efflorescence, microfractures, loss of gloss, stains and development of organisms. The preservation of brightness and susceptibility to weathering of the marbles Bege Bahia depend on the mineralogical composition. The calcite is the dominant mineral: the vulnerability manifests in the physical domain, due to the low hardness (3) and in the chemical, where the reactivity with acid products (including rain itself) results in loss of reflectance and dissolution. Daily changes in relative humidity, in Recife, around 80%, favor the crystallization and dissolution of salts, being ideal conditions for change processes in claddings such as stains lithic detachments, efflorescence and disaggregation. Marbles, mainly sedimentary limestones, present early changeability and arenization, sometimes, under 5 years of application, if not resined.
ISSN:	1518-1634 1807-1600
Fuente:	Engineering Database