【摘要】 应用交流阻抗谱方法,研究了硫酸盐对混凝土的化学侵蚀.由于硫酸盐溶液在混凝土中不形成氧化还原体系,故研究采用了与水化过程的阻抗谱相对比的方法,通过混凝土试样在硫酸盐溶液中和水中扩散阻抗系数的不同,观察了试样在硫酸盐侵蚀下毛细结构的变化.陶粒混凝土在硫酸盐侵蚀下产生了特殊的交流阻抗谱,其复平面图呈双曲正切型,它是由在陶粒混凝土中产生的有限扩散层所引起的.根据混凝土介质中扩散系数的特征,对扩散层的厚度进行了定性讨论.更多还原

【Abstract】 The chemical attack of sulfate on the concrete was studied by AC impedance technique. As the sulfate solution does not form a redox system, comparison was made between the AC response of the hydration process and the sulfate attack of the concrete. The results show that, for ordinary concrete, the diffusion impedance coefficient in sulfate solution is much less than that in water. It means that the capillary diameter in microstructure of concrete is much larger in sulfate solution than that in water. For pottery grain concrete, AC response is of hyperbolic tangent type for the sulfate solution case which means that the diffusion layer is finite.更多还原