Corrosion behavior of the reinforcement in chloride-contaminated alkali-activated fly ash pore solution

Zhang, Zhangmin and Chen, Rui and Hu, Jie and Wang, Yangyang and Huang, Haoliang and Ma, Yuwei and Zhang, Zuhua and Wang, Hao and Yin, Suhong and Wei, Jiangxiong and Yu, Qijun (2021) Corrosion behavior of the reinforcement in chloride-contaminated alkali-activated fly ash pore solution. Composites Part B: Engineering, 224:109215. pp. 1-14. ISSN 1359-8368


Abstract

Corrosion performance of the reinforcement was dramatically affected by chemical compositions of pore solution in alkali-activated fly ash. In this study, the electrochemical behavior and surface properties of reinforcement were characterized in chloride-contaminated simulated alkali-activated fly ash pore (SAFP) solution. The results indicated that due to the high alkalinity and formation of zeolite-like adsorption layer (about 20 nm), the reinforcement was still in passive state and exhibited high corrosion resistance in chloride-contaminated SAFP solution. However, the protective effect of passivation film (consisted of mainly FeOOH outer film and FeO inner film) and corrosion resistance of the reinforcement were reduced by chlorides. Further, the chloride threshold in SAFP solution was 10 times larger than simulated cement pore solution, due to the competitive adsorption between OH−/silicates and chlorides.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 21 Jul 2022 23:57
Last Modified: 25 Jul 2022 03:35
Uncontrolled Keywords: Alkali-activated fly ash; Chloride threshold concentration; Chloride-induced corrosion; Corrosion behavior; Reinforcement
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401602 Composite and hybrid materials
40 ENGINEERING > 4005 Civil engineering > 400505 Construction materials
Socio-Economic Objectives (2020): 12 CONSTRUCTION > 1203 Construction materials performance and processes > 120301 Cement and concrete materials
Identification Number or DOI: https://doi.org/10.1016/j.compositesb.2021.109215
URI: http://eprints.usq.edu.au/id/eprint/50141

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