Suchergebnisse

Trabajo presentado en el XII DBMC - 12th International Conference on Durability of Building Materials and Components, celebrado en Oporto (Portugal), del 12 al 15 de abril de 2011 ; Corrosion of reinforcement in concrete structures is influenced by salt concentration in marine aerosol inland. This work analyses the behaviour of marine aerosol salinity in marine atmosphere zone in Brazilian coast and its interaction with concrete structures. Marine aerosol salinity was monitored on chloride concentration in marine aerosol by the wet candle method and chloride concentrations in concrete were periodically monitored by chloride profiles analysis. Results show a strong decrease in airborne salinity with the distance from the sea as well as in chloride penetration into concrete structures. However, this does not take pace at the same rate. Numerical extrapolations of chloride profiles in concrete over time, which took into account environmental and material data, show that chloride deposition rate on the wet candle can be used as an environmental indicator, helping to set different marine aggressiveness subzones in the studied region, with different material requirements for a required service life. ; The authors thank the Brazilian Government Agency for the Improvement of Graduated Professionals and Eduardo Torroja Construction Research Institute for partially supporting this research. The authors also thank the Bazilian National Institute of Meteorology for providing climatic data