Abstract
The evaluation method of chloride diffusion and the deterioration mechanism of reinforced concrete (RC) under the coexistent environment of high hydraulic pressure and stray current are essential for the development of ultra-deep underground rail transit projects in coastal cities. In this study, an advanced test system was developed to solve these urgent problems. The instantaneous electric conductivity during the entire deterioration process was continuously monitored. The microstructure of pores, the physical and mechanical properties of the interface transition zone (ITZ) between corroded reinforcement and concrete, and the pullout resistance of the deteriorated specimens were comprehensively analyzed. The results showed that the instantaneous electric conductivity of specimens in ultra-deep buried environments depended on the distribution of free ions in concrete. Furthermore, the diffusion of chloride ions could be detected. Based on FTIR (Fourier transform infrared spectroscopy), Vickers hardness, and CT (computer tomography) scanning, the mechanism of bond deterioration between corroded reinforcement and concrete was revealed. These research results can provide a reference for the construction in ultra-deep underground rail transit projects.
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The datasets generated during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This work was supported by the State Major Program of National Natural Science Foundation of China (Grant Number 52090082); National Natural Science Foundation of China (Grant Number 51808207); High-level Talent of Innovative Research Team of Hunan Province, China (2019RS1030).
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Conceptualization: [YC, XK]; Methodology: [YC, XK]; Formal analysis and investigation: [YC, XK, RC]; writing—original draft preparation: [YC, MC]; writing—review and editing: [YC, XK, RC, MC]; funding acquisition: [XK, RC]; Resources: [YC, MC]; Supervision: [XK, RC].
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Chen, Y., Chen, M., Chen, R. et al. Deterioration mechanism of chloride attack on reinforced concrete under stray current and high hydraulic pressure coexistence environment. Mater Struct 56, 160 (2023). https://doi.org/10.1617/s11527-023-02242-5
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DOI: https://doi.org/10.1617/s11527-023-02242-5