Wang, YC, Basheer, PAM orcid.org/0000-0002-0835-8029, Nanukuttan, S et al. (1 more author) (2016) Progress of carbonation in chloride contaminated concretes. In: Proceedings of the 5th International Conference on the Durability of Concrete Structures. 5th International Conference on the Durability of Concrete Structures, 30 Jun - 01 Jul 2016, Shenzhen, China. Purdue University Press , pp. 317-327. ISBN 978-1-62671-065-8
Abstract
Concretes used in marine environment are generally under the cyclic effect of CO 2 and chloride ions (Cl - ). To date, the influence of carbonation on ingress of chloride ions in concretes has been widely studied; in comparison, study on the influence of Cl - on the progress of carbonation is limited. During the study, concretes were exposed to independent and combined mechanisms of carbonation and chloride ingress regimes. Profiles of apparent pH and chloride concentration were used to indicate the progress of carbonation and ingress of Cl - in concretes. From the apparent pH profile, a carbonation front and a carbonation boundary were characterized according to profile of consumed hydroxyl ions (OH - ). Results show that carbonation was significantly slowed down due to the existence of Cl - , viz. the depth of carbonation boundary was decreased; the profile of consumed OH - became modest; the carbonation front for different mixes presented slightly different trends. For the sound concretes, carbonation generated microcracks on concrete surface and increased permeation properties; for the chloride contaminated concretes, due to the limited extent of carbonation, permeation properties did not present obvious difference.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Keywords: | combined mechanism, carbonation, chloride ions, alkalinity, permeation properties, relative humidity |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) > Institute for Resilient Infrastructure (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 13 Oct 2017 09:22 |
Last Modified: | 13 Oct 2017 09:22 |
Published Version: | http://docs.lib.purdue.edu/icdcs/2016/ |
Status: | Published |
Publisher: | Purdue University Press |
Identification Number: | 10.5703/1288284316151 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:122437 |