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Mould and phototroph growth on masonry façades after repainting

Shirakawa, M. A. ; John, V. M. ; Gaylarde, C. C. ; Gaylarde, P. ; Gambale, W.

Materials and structures, 2004-08, Vol.37 (7), p.472-479 [Periódico revisado por pares]

Dordrecht: Springer Nature B.V

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  • Título:
    Mould and phototroph growth on masonry façades after repainting
  • Autor: Shirakawa, M. A. ; John, V. M. ; Gaylarde, C. C. ; Gaylarde, P. ; Gambale, W.
  • Assuntos: Building construction ; Building materials ; Civil engineering ; Fungi
  • É parte de: Materials and structures, 2004-08, Vol.37 (7), p.472-479
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: The appearance and durability of paint films are affected by microbial growth and fungi and phototrophs are considered to be especially important, degrading the films mechanically, by the production of metabolites, chiefly acids, and by enzymatic activity. In this study, fungi and phototrophs were identified before and throughout one year after painting two building façades in São Paulo. Disinfection with hypochlorite and high-pressure water jet cleaning of the façades caused reduction of at least 85% in the microbial population. Paint was applied with or without a biocide formulation (0.25% w/w)-carbendazin, N-octyl-2H-isothiazolin-3-one and N-(3,4-dichlorophenyl)N,N-dimethyl ure. The biocide reduced fungal colonization up to 10 months after painting on one building. However after 12 months biocide made no statistically significant difference. The major fungal contaminant was the genusCladosporium. After 10 monthsAureobasidium was also associated with black discoloration. On both the re-painted. façades, fungi were detected before phototrophs, contrary to the citations from the literature. SEM showed that fungal contamination was present not only on the surface, but between the old and new paint films and between old paint and rendering mortar. Under these conditions building façade details and micro-environment seem to be more important than biocide in controlling fungal growth.[PUBLICATION ABSTRACT]
  • Editor: Dordrecht: Springer Nature B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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