Evaluation of chloride deposition using the wet candle method: a study in the city of Cabo Frio, RJ
DOI:
https://doi.org/10.5902/2179460X75364Keywords:
Durability, Reinforced concrete, Ambiental aggressiveness, ChlorideAbstract
In a context of durability design of reinforced concrete structures, it is necessary to establish the divisions of the aggressiveness classes of the different maritime and coastal environments in order to contribute to the study of the classification of environmental aggressiveness. In this paper, the deposition of aggressive ions and the general climatic aspects of the coastal region of the city of Cabo Frio, RJ, are evaluated. For the analysis, the wet candle method (Brazilian NBR 6211, 2001) was adopted. The exhibitions were held at five different points throughout the city, each with three wet candles. To quantify the chloride content, the conductimetry method was used, which is done by measuring the electrical conductivity of an electrolyte solution due to ion migration. The results point to a high level of chlorides in the initial range of distance from the sea and a considerable decrease from approximately 900 meters from the seashore. In this way, it was possible to verify that the city, in its interior, is under moderate to minimal aggressiveness. In the initial distances of the seashore, there is high aggressiveness. These results show the importance of considering micro exposure environments during the design phase of reinforced concrete structures.
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References
Associação brasileira de normas técnicas. Nbr 6211. (2001). Corrosão atmosférica: Determinação de cloretos na atmosfera pelo método da vela úmida. Rio de Janeiro: NBR.
American society for testing and materials - astm d4308 – (2022). Standard Test Method for Electrical Conductivity of Liquid
Hydrocarbons by Precision Meter. PA, EUA: West Conshohocken.
American society for testing and materials - ASTM D512 – (2004). Standard Test Method for Chloride Ion in Water. PA: ASTM International: West Conshohocken.
Beushausen, H., ndawula, J., Helland, S., Papworth, F., & Linger, L.
(2001). Developments in defining exposure classes for durability design and specification. Structural Concrete, 22, 2539– 2555.
Borba JR, J. C. (2011). Agressividade ambiental em zona de atmosfera marinha: estudo da deposição de cloretos e sua concentração em concretos na região sudeste. (Tese de doutorado) - Universidade Federal do Espírito Santo, Vitória, ES, Brasil.
Garcia, R. B., Padaratz, I. J., & Szpoganicz, B. (2007). Agressividade marinha medida pela taxa de deposição de cloretos na região da grande Florianópolis. In 49° Congresso Brasileiro do Concreto. (pp. 420-431). Bento Gonçalves.
IBGE (2022). Censo Demográfico. Recuperado de: https://www.ibge.gov.br/estatisticas/sociais/trabalho/22827-censo-demografico-2022.html
Medeiros, A., Cheen, L. Y., Generoso, B., Abrahão, T. B., Silveira, G. C., & Mazer, W. (2019). Estudo da penetração de cloretos em concretos expostos por dois anos em ambiente marinho. XV Congreso Latino-Americano de Patología de Construcción - XVII Congreso de Control de Calidad en la Construcción.
Meira, G. R. (2004). Agressividade por cloretos em zona de atmosfera marinha frente ao problema da corrosão em estruturas de concreto. (Tese de doutorado) - Universidade Federal de Santa Catarina, SC, Brasil.
Meira, G. R., Andrade, M. C., Padaratz, I. J., Alonso, M. C., & Borba Jr, J. C. (2006). Measurements and modelling of marine salt transportation and deposition in a tropical region in Brazil. Atmospheric Environment, 40, 5596-5607. Doi: 10.1016/j.atmosenv.2006.04.053. 2006.
Meira, G. R., Medeiros, W. T., Lima, E. P., & Andrade, C. (2017). Vertical distribution of marine aerosol salinity in a Brazilian coastal area - The influence of wind speed and the impact on chloride accumulation into concrete. Construction & Building Materials, 135, 287-296.
Morcillo, M., Chico, B., Mariaca, L., & Otero, E. (2000). Salinity in marine atmospheric corrosion: its dependence on the wind regime existing in the site. Corrosion Science, 42, 91-104.
Sell JR, F. K. (2020). Análise dos procedimentos de avaliação do potencial de durabilidade das estruturas de concreto com base na determinação do coeficiente de difusão de cloretos. Dissertação (Mestrado em Engenharia Oceânica) - Universidade Federal do Rio Grande, Rio Grande, RS, Brasil.
Souza, A. G., Chagas, F. W. M., Gois, L. C. & Silva, J. G. (2018). Determinação condutométrica e potenciométrica de ácido acetilsalicílico em Aspirina®: Uma sugestão de prática para a análise instrumental. Revista Virtual de Química, 10, 502-517.
Wally, G. B., Magalhães, F. C., & Silva Filho, L. C. P. (2019). From prescriptive to performance-based: An overview of international trends in specifying durable concretes. Journal of Building Engineering, 52, 104359.
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