Ma, Qianmin;
Bai, Yun;
Yang, Changhui;
Basheer, PA Muhammed;
Nanukuttan, Sreejith V;
(2022)
Suitability of electrochemical test methods for evaluating corrosion of steel in alkali-activated slag concrete.
Magazine of Concrete Research
, 74
(24)
pp. 1259-1269.
10.1680/jmacr.21.00089.
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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.
| Type: | Article |
|---|---|
| Title: | Suitability of electrochemical test methods for evaluating corrosion of steel in alkali-activated slag concrete |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1680/jmacr.21.00089 |
| Publisher version: | https://doi.org/10.1680/jmacr.21.00089 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | 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 UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10154082 |
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