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<p>This study investigated chloride ion diffusion in marine silt-exposed concrete through integrated experimental and numerical approaches. The experimental results demonstrate that the chloride concentration profiles exhibit a characteristic “rise–peak–decay” pattern, with peak concentrations occurring at a depth of 6–8&#xa0;mm under various submersion conditions. Quantitative analysis revealed that increasing submersion time and depth exacerbated chloride penetration. At a burial depth of 1.0&#xa0;m, peak chloride concentrations increase by 18.7% (from 0.32 to 0.38%) as exposure time extends from 60 to 120 d. A mesoscale numerical model was developed to simulate chloride diffusion, incorporating realistic aggregate geometries and interfacial transition zone (ITZ) effects. Irregular aggregate shapes reduced chloride mobility by 12.3% compared to idealized circular aggregates. Random quadrilateral aggregate models achieved &lt;5% deviation from experimental data, outperforming circular models (error &gt; 15%). Sensitivity analyses identified the age factor (<i>m</i>) and mortar diffusion coefficient (<i>α</i>) as factors significantly affecting simulation accuracy. Optimizing <i>m</i> to 0.8625 and <i>α</i> to 0.212 reduced maximum errors from 11.5% to 3.8%. ITZ thickness variations (20–80&#xa0;μm) had a negligible impact (&lt; 3% error). Post-optimization, the model achieved &lt;5% deviation from empirical results, validating its reliability for predicting chloride ingress in marine silt environments. This work provides actionable insights for enhancing concrete durability in coastal infrastructure through tailored mesoscale modeling and parameter optimization.</p>

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Experimental and Numerical Simulation Research on Chloride Ion Corrosion of Concrete in a Marine Silt Environment

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Lingjie Wu,
  • Yufeng Xia,
  • Fenfei Shi

摘要

This study investigated chloride ion diffusion in marine silt-exposed concrete through integrated experimental and numerical approaches. The experimental results demonstrate that the chloride concentration profiles exhibit a characteristic “rise–peak–decay” pattern, with peak concentrations occurring at a depth of 6–8 mm under various submersion conditions. Quantitative analysis revealed that increasing submersion time and depth exacerbated chloride penetration. At a burial depth of 1.0 m, peak chloride concentrations increase by 18.7% (from 0.32 to 0.38%) as exposure time extends from 60 to 120 d. A mesoscale numerical model was developed to simulate chloride diffusion, incorporating realistic aggregate geometries and interfacial transition zone (ITZ) effects. Irregular aggregate shapes reduced chloride mobility by 12.3% compared to idealized circular aggregates. Random quadrilateral aggregate models achieved <5% deviation from experimental data, outperforming circular models (error > 15%). Sensitivity analyses identified the age factor (m) and mortar diffusion coefficient (α) as factors significantly affecting simulation accuracy. Optimizing m to 0.8625 and α to 0.212 reduced maximum errors from 11.5% to 3.8%. ITZ thickness variations (20–80 μm) had a negligible impact (< 3% error). Post-optimization, the model achieved <5% deviation from empirical results, validating its reliability for predicting chloride ingress in marine silt environments. This work provides actionable insights for enhancing concrete durability in coastal infrastructure through tailored mesoscale modeling and parameter optimization.