Abstract
The corrosion of steel caused by chloride ions is considered to be the main durability problem of reinforced concrete structures. This paper investigates the total chloride ion content, free chloride concentration in expressed pore solution, Friedel’s salt content, and porosity of portland cement (PC) and PC/fly ash (FA) combination pastes after 7 days of water curing followed by 28 or 150 days immersion in water or 0.3, 0.7, 1.0, and sodium chloride solutions. Results showed that the chloride ion binding capacities of the pastes increased with increase of free chloride ion concentration. The relationship between bound and free chloride ion contents could be described by Langmuir’s equation. The addition of fly ash decreased the bound chloride content and showed negative influences on Friedel’s salt formation due to low activity. Porosity of cement paste decreased as the concentration of soaking chloride ion increased, and was inversely proportional to the amount of Friedel’s salt formed.
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Acknowledgments
Financial support from National Science Foundation of China under contract Nos. 51378196 and 51072050 are greatly appreciated.
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 1 • January 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Oct 30, 2015
Accepted: Jun 8, 2016
Published online: Aug 1, 2016
Published in print: Jan 1, 2017
Discussion open until: Jan 1, 2017
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