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基于氯离子扩散传输机理,利用有限体积法(FVM)推导了二维矩形和圆形截面混凝土氯离子扩散传输离散方程。根据FVM的数值模拟计算结果,研究了暴露条件及混凝土组成材料对具有不同截面形状的混凝土构件中氯离子含量及使用寿命的影响。数值模拟计算表明,不仅暴露条件、混凝土组成材料等对海工混凝土结构的耐久性有重要影响,而且其影响程度与混凝土构件截面的几何形状有关,有比较明显的几何形状效应。圆形截面由于有近似的一维扩散传输特征,在相同条件下,混凝土中的氯离子含量小于矩形截面,其使用寿命比矩形截面的大,但两种截面的差别在不同暴露条件和混凝土组成材料时又有显著的不同,大气区以及掺矿渣时更为明显。
Based on the mechanism of chloride ion transport, the chloride diffusion diffusion equation of two-dimensional rectangular and circular cross-section concrete is deduced by the finite volume method (FVM). According to the FVM numerical simulation results, the effects of exposure conditions and concrete composition on the chloride ion content and service life of concrete members with different cross-sectional shapes were studied. Numerical simulation shows that not only the exposure conditions, the composition of concrete materials and so on have an important influence on the durability of marine concrete structures, but also the degree of influence is related to the geometry of cross-section of concrete members with obvious geometric shape effects. Due to the approximate one-dimensional diffusion transmission characteristics of circular section, under the same conditions, the content of chloride ion in concrete is smaller than that of rectangular section, and its service life is larger than that of rectangular section. However, the difference of two sections under different exposure conditions and concrete composition Material, there are significant differences, the atmospheric zone and slag is more obvious.