混凝土在硫酸盐溶液中的腐蚀模型

混凝土在硫酸盐溶液中的腐蚀破坏是一种常见的混凝土破坏形式,研究混凝土抗硫酸盐腐蚀破坏对于混凝土工程具有重要意义。混凝土在硫酸盐溶液中受腐蚀的过程是一个循序渐进的过程,这个过程包括固液界面的表面吸附、硫酸盐溶液的扩散过程以及硫酸盐在混凝土试件内部的化学反应和物理结晶等物理化学过程。研究表明:可以采用Fick第二扩散定律来描述硫酸盐在混凝土中的扩散过程;硫酸盐溶液中,混凝土试件的固液相界面处发生物理吸附和化学吸附,并存在表面化学反应。

A corrosion model of concrete in sulfate

Corrosion in sulfate solutions is one of the normal ways of concrete failure, and thus researching anti-corrosion methods of concrete against sulfate solution is of great significance to concrete projects. The corrosion process of concrete in sulfate solution is gradual, and it involves the interface adsorption on the surface of the solid-liquid, diffusion process of the sulfate solution and the processes of chemical reaction and physical crystallization of sulfate inside specimens. Our research shows the second Fick diffusion law can be used to describe the diffusion process of concrete in sulfate. When concrete specimens are immersed in sulfate solution, there are physical adsorption and chemical adsorption on the solid-liquid interface, and chemical reactions on the surface.