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<p>This study aims to develop a chloride diffusion simulation method that considers the hydration microstructure and pore solution properties during the hydration of tricalcium silicate (C<sub>3</sub>S). The method combines the hydration simulation, thermodynamic calculation, and finite element analysis to examine the effects of pore solution, including effect of electrochemical potential, effect of chemical activity, and effect of mechanical interactions between ions, on the chloride effective diffusion coefficient of hydrated C<sub>3</sub>S paste. The results indicate that the effect of electrochemical potential on chloride diffusion becomes stronger with increasing hydration age due to the increase in the content of hydrated calcium silicate; as the hydration age increases, the effect of chemical activity on chloride diffusion weakens when the number of diffusible elements decreases; the effect of mechanical interactions between ions on chloride diffusion decreases with the increase of hydration age.</p>

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Estimation of Chloride Diffusivity in Hydrated Tricalcium Silicate Using a Hydration-Diffusion Integrated Method

  • 期刊论文

  • 发表日期：

    2025年1月17日

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  • Xin Wang,
  • Dejian Shen,
  • Sijie Tao,
  • Ruixin Liu,
  • Shengxing Wu

摘要

This study aims to develop a chloride diffusion simulation method that considers the hydration microstructure and pore solution properties during the hydration of tricalcium silicate (C3S). The method combines the hydration simulation, thermodynamic calculation, and finite element analysis to examine the effects of pore solution, including effect of electrochemical potential, effect of chemical activity, and effect of mechanical interactions between ions, on the chloride effective diffusion coefficient of hydrated C3S paste. The results indicate that the effect of electrochemical potential on chloride diffusion becomes stronger with increasing hydration age due to the increase in the content of hydrated calcium silicate; as the hydration age increases, the effect of chemical activity on chloride diffusion weakens when the number of diffusible elements decreases; the effect of mechanical interactions between ions on chloride diffusion decreases with the increase of hydration age.