Experimental Analysis of Chloride Penetration into Concrete Subjected to Drying–Wetting Cycles
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 12
Abstract
To clarify the mechanism of chloride penetration into concrete subjected to drying–wetting cycles, two kinds of concrete, ordinary portland cement concrete and fly ash (FA) concrete, were tested in a cyclic NaCl solution to show the influence of mix proportion, period ratio of drying to wetting, and exposure time. Based on the experimental profiles of free chloride concentration obtained after 30 and 60 weeks, it was found that the depth of convection zone varied from 6 to 15 mm and increased in duration when the air-drying period in one cycle was prolonged or the exposure time increased. Through a regression analysis of chloride profiles located in the inner part of the concrete beyond the advection zone, it was verified that diffusion was the dominant mechanism of chloride transport and could be well fitted with the proposed modified diffusion model taking into account the influence of convection depth. Finally, the time-dependent chloride diffusion coefficient was calculated on the basis of the apparent chloride diffusion coefficient and the obtained time exponent . The effect of FA content on was also examined.
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Acknowledgments
The authors would acknowledge the financial support of the National Natural Science Foundation of P.R. China (Grants 50908103, 51278230, and 51378241), the High-Grade Talent Program of Jiangsu University (Grant 11JDG132), and the Doctoral Foundation of Ministry of Education of China (Grant 20123227110006) in carrying out this research.
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 12 • December 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Aug 12, 2014
Accepted: Feb 6, 2015
Published online: Apr 3, 2015
Discussion open until: Sep 3, 2015
Published in print: Dec 1, 2015
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