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将Debye-Hckel理论和Onsager电导理论用于研究混凝土孔溶液中离子的扩散规律.首先,建立了饱和混凝土中离子扩散系数的计算模型,该模型考虑了离子的种类、孔溶液中离子的浓度、环境温度等因素对离子扩散系数的影响.其次,以孔溶液中氯化钠的浓度变化为例分析了离子氛半径、松弛效应、电泳效应等对孔溶液中氯离子扩散系数的影响规律,发现氯离子的扩散系数随氯化钠溶液浓度的增加而减小,离子氛半径和电泳效应是影响氯离子扩散性能的重要参数.最后,通过RCM法测定了不同水灰比混凝土的氯离子扩散系数,并将模型的计算结果与实测结果进行了对比,以验证模型的合理性,结果表明所建立的模型与实测结果较为符合.
Debye-Höckel theory and Onsager conductance theory are used to study the diffusion rules of ions in concrete pore solution.Firstly, a calculation model of ion diffusion coefficient in saturated concrete is established, which takes into account the types of ions, the ionic Concentration, ambient temperature and other factors on ion diffusion coefficient.Secondly, taking the change of sodium chloride concentration in pore solution as an example, the influence law of ion radius, relaxation effect and electrophoresis on the chloride diffusion coefficient in pore solution was analyzed , It was found that the diffusion coefficient of chloride ion decreased with the increase of sodium chloride solution concentration.The ionic radius and electrophoresis effect were the important parameters affecting the chloride ion diffusion performance.Finally, the chloride ion Diffusion coefficients were calculated and compared with the measured results to verify the rationality of the model. The results show that the established model is in good agreement with the measured results.