海砂砂浆碳化过程的电化学阻抗谱研究

Electrochemical Impedance Spectroscopy of the Carbonation Behavior of Mortar with Marine Sand

关键词:  海砂砂浆  电化学阻抗谱  等效电路模型  预测  碳化深度

Key words:  marine sand mortar  electrochemical impedance spectrum  equivalent circuit model  prediction  carbonation depth

摘要:

通过建立新的电化学等效电路模型，分析了海砂砂浆的碳化行为，并对新模型进行理论数学推导，得出了新模型在复平面中的曲线方程；同时通过对比分析验证了新模型的合理性.结果表明：碳化过程会引起海砂砂浆的电化学阻抗谱行为发生规律性的变化，高频圆直径随碳化龄期增大而增大；由电化学阻抗谱拟合获得的电化学模型参数具有规律性，可以定量表征海砂砂浆的碳化过程，其参数分别与碳化深度和碳化时间存在函数关系，可以对海砂砂浆的碳化深度进行预测.

Abstract:

A new electrochemical model has been established to explain the carbonation behavior of marine sand mortars. To conduct the mathematical derivation of the new model, a curvilinear equation in Nyquist plot was acquired. The reliability of the model has been proved by way of comparing the new model with the previous. The experimental results demonstrate that electrochemical impedance behavior of mortars has been moderated in the process of the carbonation. The carbonation process can be quantitatively analyzed by the parameters fitted from the electrochemical model. Moreover, prediction of the carbonation depth can be achieved.