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Deterioration mechanism of chloride attack on reinforced concrete under stray current and high hydraulic pressure coexistence environment
https://orcid.org/http://orcid.org/0000-0001-6968-4955
https://orcid.org/http://orcid.org/0000-0002-9758-9100
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.
Deterioration mechanism of chloride attack on reinforced concrete under stray current and high hydraulic pressure coexistence environment
https://orcid.org/http://orcid.org/0000-0001-6968-4955
https://orcid.org/http://orcid.org/0000-0002-9758-9100
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.
Deterioration mechanism of chloride attack on reinforced concrete under stray current and high hydraulic pressure coexistence environment
https://orcid.org/http://orcid.org/0000-0001-6968-4955
https://orcid.org/http://orcid.org/0000-0002-9758-9100
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.
Deterioration mechanism of chloride attack on reinforced concrete under stray current and high hydraulic pressure coexistence environment
Mater Struct
Chen, Yongqing (author) / Chen, Mingyue (author) / Chen, Renpeng (author) / Kang, Xin (author)
2023-11-01
Article (Journal)
Electronic Resource
English
Reinforced concrete , Stray current , Chloride induced corrosion , Instantaneous electrical conductivity , Microstructure characteristics , Diffusion coefficient Engineering , Solid Mechanics , Materials Science, general , Theoretical and Applied Mechanics , Manufacturing, Machines, Tools, Processes , Civil Engineering , Building Materials
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