泡沫混凝土阻抗谱的双曲正切特性

Hyperbolic Tangent Characteristics of Impedance Spectroscopy of Foam Concrete

为研究泡沫混凝土内部的扩散特性,利用电化学法,对比分析了泡沫混凝土与普通混凝土在不同水温、有无发泡剂以及不同浸水时间等条件下的交流阻抗图谱.结果表明:与普通混凝土相比,泡沫混凝土由于存在内部气孔而具有截然不同的细观结构和扩散特性,表现在阻抗谱上,即为其Nyquist图中的曲线是双曲正切型而非Randles型;通过对泡沫混凝土扩散特性与双曲正切曲线的关联,可以求得扩散系数与扩散层厚度等表征其扩散特性的参数.

In order to investigate the characteristics of internal diffusion of foam concrete, AC impedance spectroscopy of foam concrete was tested by electrochemical method at different water temperature, the presence or absence of foaming agent and different immersion time. AC impedance spectroscopy of foam concrete and ordinary concrete were researched. The results show that due to existence of inner bubbles in the foam concrete, its microstructure and characteristics of diffusion are different from those of ordinary concrete. In AC impedance spectroscopy, its Nyquist plot is of hyperbolic tangent type rather than Randles type as seen for the ordinary concrete. By correlation between the characteristics of diffusion and the hy perbolic tangent function, diffusion coefficient and depth o{ diffusion layer can be calculated.