Chloride Diffusion Analysis of Concrete Members Considering Depth-Dependent Diffusion Coefficients and Effect of Reinforcement Presence
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 5
Abstract
This paper presents the results of an experimental investigation on chloride diffusion in plain concretes and reinforced concretes. Concretes were exposed to chloride environment simulated by a self-designed tidal circulation device for 35, 70, and 100 days. Chloride concentrations () in powder samples which were milled layer-by-layer from plain concretes and drilled along the direction of rebar from reinforced concretes were measured. at the apex of the rebar were compared to that at the corresponding depth in plain concretes to study the blocking effect of rebar. Meanwhile, diffusion coefficients () at different depths were determined by applying Fick’s second law to study the depth-dependent characteristic of diffusion. The results show that along the direction of penetration, decreases first and then increases; rebar does change the distribution of , and the larger the diameter, the greater the effect. The effect of rebar is not only embodied in the physical obstruction but also in the variations in concrete composition. Based on the results obtained, a quantitative chloride diffusion model considering rebar presence, depth-dependent characteristics, and time is given.
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Acknowledgments
The authors are grateful to the finical support from the National Natural Science Foundation of China (Grant No. 51279128), the innovative research groups Science Foundation (Grant No. 51321065) and the Construction Science and Technology Project of Ministry of Transport of the People’s Republic of China (Grant No. 2014328224040).
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 5 • May 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Dec 28, 2014
Accepted: Jul 13, 2015
Published online: Nov 4, 2015
Discussion open until: Apr 4, 2016
Published in print: May 1, 2016
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