氯离子在混凝土中的扩散性及其电化学测试方法

Diffusivity of chloride ion in concrete and its electrochemical measuring method

从物质的传质机理角度分析认为,氯离子在混凝土中的传质过程为扩散过程。按照Fick定律,利用电化学方法可测得交流阻抗谱,据此计算出氯离子扩散系数。同时分析讨论了溶液中其他离子存在时,计算公式的修正,以及在水头或荷载作用下,渗透和扩散的协同作用。

From the view of mass transfer mechanism, the process of chloride transmission in the concrete is considered to be diffusive. According to Fick＇s Law, the impedance spectra can be measured with electrochemical method, from which the diffusion coefficient of chloride ion can be calculated. The calculation formula for chloride ion is modified considering the other kinds of ions co-existed; and then the synergic function of the permeability and diffusivity under water pressure and load is discussed herein as well.