Wang, Y;
Nanukuttan, S;
Bai, Y;
Basheer, PAM;
(2017)
Influence of combined carbonation and chloride ingress regimes on rate of ingress and redistribution of chlorides in concretes.
Construction and Building Materials
, 140
pp. 173-183.
10.1016/j.conbuildmat.2017.02.121.
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Abstract
In majority of exposure environments for concrete structures, there is a high probability of the cyclic occurence of both chloride ingress and carbonation. This paper reports a detailed investigation on the influence of carbonation on both the ingress and distribution of chlorides in three different types of concretes, by comparing results from exposure to chlorides, chlorides before carbonation and chlorides after carbonation. Concretes studied were of 0.55 water-binder ratio with 100% Portland Cement (PC), 70% PC + 30% pulverized fuel ash (PFA) and 85% PC + 10% PFA + 5% microsilica (MS) as binders. Chloride profiles were compared to assess the effects of all variables studied in this research. The effect of carbonation was quantified by measuring the consumption of hydroxyl ions (OH−), air permeability and chloride migration coefficient. The results indicated that carbonation of concrete increases chloride transport, but the precise nature of this is dependent on the combined regime as well as the type of binder. In general, it was found that carbonation of chloride contaminated concretes results in a decrease of their chloride binding capacity, that is it releases the bound Cl− in concretes and pushes chlorides inwards, as has been established previously by other researchers. However, it is established in this research that the combined regimes detrimentally affect the service life of concrete structures, particularly when chloride induced corrosion is a concern.
| Type: | Article |
|---|---|
| Title: | Influence of combined carbonation and chloride ingress regimes on rate of ingress and redistribution of chlorides in concretes |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.conbuildmat.2017.02.121 |
| Publisher version: | http://doi.org/10.1016/j.conbuildmat.2017.02.121 |
| Language: | English |
| Additional information: | Copyright © 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/). |
| Keywords: | Air permeability; Carbonation; Chloride profile; Chloride migration; pH profile; Combined exposures |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1560407 |
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