Research on the mechanism of chlorine corrosion resistance of graphite tailings modified recycled coarse aggregate concrete: Corrosion product transformation and multi-scale mathematical characterization model

This research investigated the impact of substituting sand with graphite tailings (GT) on the chloride ion erosion resistance of recycled aggregate concrete (RAC). The role of GT is to significantly inhibit the penetration of chloride ions into the interior and slow down the corrosion process. Howev...

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Bibliographic Details
Published in:Corrosion science 2024-06, Vol.233, p.112099, Article 112099
Main Authors: Zhang, Yu, Li, Ben, Zhang, Chen, Xu, Hu, Li, Kaihang, Zhao, Canhao
Format: Article
Language:English
Subjects:
Chloride ion corrosion
Chloride ion transport
Graphite tailings (GT)
Recycled aggregate concrete (RAC)
Theoretical model
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Summary:This research investigated the impact of substituting sand with graphite tailings (GT) on the chloride ion erosion resistance of recycled aggregate concrete (RAC). The role of GT is to significantly inhibit the penetration of chloride ions into the interior and slow down the corrosion process. However, the durability of graphite tailings recycled aggregate concrete (GTRAC) still depends on the replacement rate of recycled aggregate. At the same time, a multi-scale dynamic model of physical adsorption-chemical binding-free transport and erosion of chloride ions in GTRAC were established based on unsteady viscous fluid force and molecular dynamics. •The purpose of improve the sulfate attack performance of concrete by GT was proved.•The Proportioning design was optimized for improving the performance.•The mechanism of action of GT was discussed.•A multi-scale dynamic model was established in this paper.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2024.112099