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潮差区、浪溅区处于干湿交替的复杂环境中,是腐蚀劣化最为严重的区域,直接影响着海工结构的耐久性和使用寿命。为了更好地描述潮差区、浪溅区的氯离子在混凝土中的侵蚀规律,本文采用Hamilton型变分原理建立氯离子的输运方程,结合细观角度,建立了一个有效的孔隙水饱和度的定量计算公式,并引入时间因素和孔隙水饱和度对非饱和状态下氯离子的扩散系数进行修正。利用有限单元法模拟氯离子在混凝土迁移过程,并与实验数据以及水下区氯离子的计算值进行对比验证。结果表明:模型计算结果和实验数据吻合较好,并且符合氯离子输运的一般规律。验证了本文提出的模型可以为潮差区和浪溅区混凝土结构的耐久性设计及服役寿命预测提供参考。
The tidal range and the splash zone are in an alternating wet and dry environment, which is the area with the most serious corrosion deterioration and directly affects the durability and service life of marine structures. In order to better describe the corrosion of chloride ion in tidal range and splash zone in concrete, a Hamilton-type variational principle is used to establish the chloride transport equation. Combined with the mesoscopic view, an effective pore water saturation Degree of quantitative calculation formula, and the introduction of time factor and pore water saturation of unsaturated chloride ion diffusion coefficient correction. The finite element method was used to simulate the migration process of chloride ions in concrete, and compared with the experimental data and the calculated value of chloride ion in underwater area. The results show that the calculated results are in good agreement with the experimental data and accord with the general rule of chloride ion transport. It is verified that the model proposed in this paper can provide reference for durability design and service life prediction of concrete structures in tidal range and splash zone.