Ma, Q, Bai, Y, Yang, C et al. (2 more authors) (2022) Suitability of electrochemical test methods for evaluating corrosion of the steel in alkali activated slag concretes. Magazine of Concrete Research, 74 (24). pp. 1259-1269. ISSN 0024-9831
Abstract
The electrochemical tests commonly used for evaluating reinforcement corrosion in Portland cement-based concrete may not be appropriate for testing alkali-activated slag (AAS) concrete due to its different pore structure and pore solution composition. In this article, corrosion behaviour of the steel bars in 12 AAS concrete mixes with different alkali concentration and modulus of sodium silicate solution was monitored by using gravimetric mass loss measurement. The results obtained from other electrochemical tests were compared to the gravimetric mass loss to determine their suitability for assessing the corrosion of steel in AAS concrete. It was found that only 7.8–28% of the mass loss was accounted for by the macrocell current for AAS concretes, indicating that this type of test underestimates the corrosion of the steel in AAS concrete. The steel bars in the AAS concretes gave a much higher negative half-cell potential value, presumably due to the influence of sulfides. In summary, it has been established that the criteria for assessing the onset and progress of corrosion of steel in Portland cement concrete are not suitable for the same purpose in the range of AAS concretes studied.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This is protected by copyright. All rights reserved. This is an author produced version of an article published in Magazine of Concrete Research. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | alkali-activated cement, alkali-activated slag, chloride, corrosion, corrosion of steel, gravimetric mass loss, half-cell potential, macrocell corrosion current |
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: | 02 Aug 2022 15:56 |
Last Modified: | 02 Aug 2023 00:13 |
Status: | Published |
Publisher: | ICE Publishing |
Identification Number: | 10.1680/jmacr.21.00089 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:189618 |