A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Suitability of electrochemical test methods for evaluating corrosion of the steel in alkali activated slag concretes
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.
Suitability of electrochemical test methods for evaluating corrosion of the steel in alkali activated slag concretes
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.
Suitability of electrochemical test methods for evaluating corrosion of the steel in alkali activated slag concretes
Ma, Qianmin (author) / Bai, Yun (author) / Yang, Changhui (author) / Basheer, P.A. Muhammed (author) / Nanukuttan, Sreejith V. (author)
2022-12-01
Ma , Q , Bai , Y , Yang , C , Basheer , P A M & Nanukuttan , S V 2022 , ' Suitability of electrochemical test methods for evaluating corrosion of the steel in alkali activated slag concretes ' , Magazine of Concrete Research , vol. 74 , no. 24 , pp. 1259-1269 . https://doi.org/10.1680/jmacr.21.00089
Article (Journal)
Electronic Resource
English
alkali activated slag , corrosion of steel , gravimetric mass loss , macrocell corrosion current , half-cell potential , chloride ingress , /dk/atira/pure/sustainabledevelopmentgoals/industry_innovation_and_infrastructure , name=SDG 9 - Industry , Innovation , and Infrastructure , /dk/atira/pure/sustainabledevelopmentgoals/climate_action , name=SDG 13 - Climate Action
Chloride transport and the resulting corrosion of steel in alkali activated slag concretes
| BASE | 2016
SOME CORROSION RESISTANCE ASPECTS OF ALKALI-ACTIVATED SLAG CEMENTS AND CONCRETES
| British Library Conference Proceedings | 2008
Chloride transport and the resulting corrosion of steel bars in alkali activated slag concretes
| Online Contents | 2016
Chloride transport and the resulting corrosion of steel bars in alkali activated slag concretes
| Online Contents | 2015