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The effects of cyclic fluid pressure on time-dependent corrosion behaviour of offshore concrete caused by chloride ions

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Abstract

The durability of the offshore reinforced concrete (RC) structures is influenced significantly by the chloride-induced corrosion on the reinforcement. In the present study, a numerical model was developed to access the transport behaviour of chloride within the concrete under cyclic fluid pressure induced by the rise and fall of the wave. The proposed chloride reactive transport model parameters were identified by performing a series of chloride diffusion tests. Results show that the concentration of free chloride in concrete is governed by the concentration of calcium silicate hydrate (C-S-H) on concrete pore surface and its binding affinity. In addition, it was determined that there should be an optimal aggregate volume fraction which gives the highest durability of the offshore RC structures. While aggregates limit the penetration of chloride into concrete, the increase in the interfacial transition zone of concrete could enhance the diffusion of chloride ions. Furthermore, the cyclic fluid pressure significantly increases the long-term uptake of chloride ions and reduces the time to reach its corrosion initiation threshold.

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The data that support the findings of this study are available on request from the corresponding author.

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Funding

The authors acknowledge the financial support provided by Shanghai Pujiang Program (21PJ1423700), the National Natural Science Foundation of China (51978505, 51608382), Shanghai Rising-Star Program (20QC1400600) and Science and Technology R&D Programs of China Railway Construction Corporation Limited (2019-C15).

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Correspondence to Kai Wu.

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Sun, D., Cao, Z., Huang, C. et al. The effects of cyclic fluid pressure on time-dependent corrosion behaviour of offshore concrete caused by chloride ions. Mech Time-Depend Mater 27, 489–504 (2023). https://doi.org/10.1007/s11043-022-09556-x

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  • DOI: https://doi.org/10.1007/s11043-022-09556-x

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