Mundra, S. orcid.org/0000-0001-6559-8814, Criado, M., Bernal, S.A. orcid.org/0000-0002-9647-3106 et al. (1 more author) (2017) Chloride-induced corrosion of steel rebars in simulated pore solutions of alkali-activated concretes. Cement and Concrete Research, 100. pp. 385-397. ISSN 0008-8846
Abstract
The passivation and chloride-induced depassivation of steel rebars immersed in varying alkaline environments (0.80 M, 1.12 M and 1.36 M NaOH solutions), simulating the pore solutions of low-Ca alkali-activated concretes, were investigated using a range of electrochemical techniques. The passive film on the steel rebars was complex in chemical makeup, composed of Fe–hydroxides, oxy-hydroxides and oxides. An increased degree of passivation of the rebars was observed when exposed to solutions with higher hydroxide concentrations. The critical chloride level ([Cl − ]/[OH − ] ratio) required to induce depassivation of steel was strongly dependent on the alkalinity of the pore solution, and was found to be 0.90, 1.70 and 2.40 for 0.80 M, 1.12 M and 1.36 M NaOH solutions, respectively. These values all correspond to a constant value of [Cl − ]/[OH − ] 3 = 1.25, which is a novel relationship to predict the onset of pitting, interlinking chloride concentration and the solubility of the passive film.
Metadata
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Copyright, Publisher and Additional Information: | © 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/). | ||||
Keywords: | Chloride (D); Corrosion (C); Electrochemical properties (C); Pore solution (B); Alkali activated cement (D) | ||||
Dates: |
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Institution: | The University of Sheffield | ||||
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) | ||||
Funding Information: |
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Depositing User: | Symplectic Sheffield | ||||
Date Deposited: | 04 Sep 2017 14:56 | ||||
Last Modified: | 04 Sep 2017 14:56 | ||||
Published Version: | https://doi.org/10.1016/j.cemconres.2017.08.006 | ||||
Status: | Published | ||||
Publisher: | Elsevier | ||||
Refereed: | Yes | ||||
Identification Number: | https://doi.org/10.1016/j.cemconres.2017.08.006 |