Materials and Structures

, Volume 37, Issue 7, pp 472–479 | Cite as

Mould and phototroph growth on masonry façades after repainting

  • M. A. Shirakawa
  • V. M. John
  • C. C. Gaylarde
  • P. Gaylarde
  • W. Gambale
Article
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Abstract

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.

Keywords

Biocide Cladosporium Phoma Paint Film Aureobasidium 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Résumé

L'aspect et la durabilité des films de peinture sont affectés par l'action microbienne, les mycètes et le cyanobacteria étant considérés comme particulièrement importants, par la dégradation mécanique des films due à la production des métabolites, notamment les acides, et par l'activité enzymatique. Dans cette étude, des mycètes et les phototrophiques ont été identifiés avant et tout au long de l'année qui a suivi la peinture des façades des deux édifices de São Paulo. La désinfection de la façade par l'hypochlorite et le nettoyage à haute pression par jet d'eau ont causé une réduction de 85% de la population microbienne. Ensuite, la peinture a été appliquée avec ou sans formulation de biocide (carbendazin, urée de N-octyl-2H-isothiazolin-3-one et de N-(3,4-dichlorophenyl)N,N-dimethyl 0,25% m/m). Le biocide a réduit la colonisation fongique jusqu'à 10 mois. Cependant, après 12 mois, le biocide n'a pas présenté de différence statistiquement significative. Le contaminant fongique principal était le genreCladosporium. Après 10 mois, l'Aureobasidium a été également associé à la décoloration noire. Sur les deux façades peintes, des mycètes ont été détectés préalablement aux phototrophiques, contrairement aux citations de la littérature. L'observation au MEB a montré que la contamination fongique était présente sur la surface, entre le vieux film et le nouveau film de peinture et entre la vieille peinture et le mortier du revêtement. La conclusion de cette étude est que l'influence du micro-environnement et des caractéristiques de la façade semble être plus importante que l'action du biocide ajusté sur la croissance fongique.

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Copyright information

© RILEM 2004

Authors and Affiliations

  • M. A. Shirakawa
    • 1
  • V. M. John
    • 2
  • C. C. Gaylarde
    • 3
  • P. Gaylarde
    • 4
  • W. Gambale
    • 5
  1. 1.Dept. of Pathology, Centro de Ciências BiológicasUniversidade Federal do ParáParáBrazil
  2. 2.Dept. of Civil Construction Eng., Escola PolitécnicaUniversidade de São PauloSão PauloBrazil
  3. 3.Dept. of Biophysics, Faculdade de BiociênciasUniversidade Federal do Rio Grande do SulPorto AlegreBrazil
  4. 4.MIRCEN, Dept. of SoilsUFRGSPorto AlegreBrazil
  5. 5.Dept. of Microbiology, Institute de Ciências BiomédicasUniversidade de São PauloSão PauloBrazil

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