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Journal of Applied Sciences
  Year: 2016 | Volume: 16 | Issue: 10 | Page No.: 484-490
DOI: 10.3923/jas.2016.484.490
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Diffusion of Chloride in Concrete under Fluctuating Environmental Conditions

Chih-Hsing Wang and Ching-Chang Lin

Background: This study investigated the one-dimensional diffusion of chloride under fluctuating environmental conditions to quantify the mass flux of a diffusing substance permeating a plate medium theoretically and verify it experimentally. Materials and Methods: An experiment was conducted by mounting a plate concrete specimen in the middle of a U-shaped tank, partitioning the tank into 2 halves. A solution involving fluctuating chloride concentrations was loaded on one side of the tank and fresh water was loaded on the other side. Chloride was predicted to permeate through the specimen. Results: The total amount of chloride diffusing through the specimen was monitored and fitted to the theoretical prediction. The diffusion coefficient, Neumann constant and proportional constant between the concentration of chloride in the environment and the corresponding saturated concentration of the concrete were quantified. Conclusion: The major contribution of this study is the use of Fick’s diffusion law with the advancing model to accurately describe the permeation flux of a diffusing substance according to fluctuating concentrations of this substance in an environment. The parameters applied are critical in evaluating the service life of a reinforced concrete structure in a salty environment involving fluctuating concentrations of diffusing substances.
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How to cite this article:

Chih-Hsing Wang and Ching-Chang Lin, 2016. Diffusion of Chloride in Concrete under Fluctuating Environmental Conditions. Journal of Applied Sciences, 16: 484-490.

DOI: 10.3923/jas.2016.484.490






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