Effect of Cyclic Carbonation on Chloride Ingression in GGBS Concrete
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Volume 28, Issue 7
Abstract
Carbonation and chloride ingress are the two main causes of corrosion in reinforced concrete structures. An investigation to monitor the ingress of chlorides and the effect of carbonation on chloride ingression during an accelerated 12 month cyclic wetting and drying exposure regime that simulates conditions in which multiple mode transport mechanisms are active was conducted on ground granulated blast furnace slag (GGBS) concrete. The penetration of chloride and carbon dioxide was evaluated using water and acid soluble chloride profiles and phenolphthalein indicator, respectively. The results indicated that when chloride and carbon dioxide ingress concomitantly the effects can be adverse. Carbonation has a detrimental effect on the binding capacity of the concrete, increasing the concentration of free (water soluble) chlorides. This contributed to greater concentration and greater penetration of chlorides and thus an increased corrosion risk.
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Journal of Materials in Civil Engineering
Volume 28 • Issue 7 • July 2016
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© 2016 American Society of Civil Engineers.
History
Received: Jun 2, 2015
Accepted: Nov 6, 2015
Published online: Feb 4, 2016
Published in print: Jul 1, 2016
Discussion open until: Jul 4, 2016
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