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The marine environment is abundant in chloride ions. These ions diffuse through the concrete protective layer, accumulating on the surface of the reinforcement. Once the chloride ion surpasses a specific concentration, the ferric oxide on the reinforcement’s outside is compromised, leading to corrosion of the reinforcement. However, the marine environment that coastal reinforced concrete structures encounter vertically can be categorized into: buried zone, immersion zone, tidal zone, splash zone and atmospheric zone. This categorization leads to varying corrosion rates of the reinforcement in different environmental sections along the vertical axis. This study established a chloride ion diffusion model influenced by temperature, humidity, and chloride ion concentration, aiming to simulate marine environments including the buried zone, immersion zone, tidal zone, splash zone and atmospheric zone. This study systematically investigated chloride diffusion characteristics across vertically stratified exposure zones, developing a time-dependent predictive model to assess reinforcement corrosion progression. The formulated methodology establishes a theoretical framework for service life prediction of marine-exposed concrete infrastructures, integrating Fick’s diffusion theory with electrochemical corrosion kinetics.

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Prediction and Analysis for the Corrosion of Steel Bar Embedded in Concrete Structure Exposed to Total Corrosion Zones in Marine Environments

  • 会议论文

  • 发表日期：

    2025年

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  • Ning Xu,
  • Wei Zhang,
  • Ji Zhang

摘要

The marine environment is abundant in chloride ions. These ions diffuse through the concrete protective layer, accumulating on the surface of the reinforcement. Once the chloride ion surpasses a specific concentration, the ferric oxide on the reinforcement’s outside is compromised, leading to corrosion of the reinforcement. However, the marine environment that coastal reinforced concrete structures encounter vertically can be categorized into: buried zone, immersion zone, tidal zone, splash zone and atmospheric zone. This categorization leads to varying corrosion rates of the reinforcement in different environmental sections along the vertical axis. This study established a chloride ion diffusion model influenced by temperature, humidity, and chloride ion concentration, aiming to simulate marine environments including the buried zone, immersion zone, tidal zone, splash zone and atmospheric zone. This study systematically investigated chloride diffusion characteristics across vertically stratified exposure zones, developing a time-dependent predictive model to assess reinforcement corrosion progression. The formulated methodology establishes a theoretical framework for service life prediction of marine-exposed concrete infrastructures, integrating Fick’s diffusion theory with electrochemical corrosion kinetics.