海砂型氯离子在混凝土中扩散的微观形貌分析

掺入模拟海砂(经NaCl溶液浸泡)进行混凝土实验,研究了海砂型氯离子在混凝土中的扩散特征,结合SEM-EDS微观实验,讨论了其传输机理,发现海砂型与氯离子掺入型的混凝土在氯离子结合、传输方式上各不相同,前者存在一个从砂子表面向混凝土内部扩散的过程.并在此基础上提出海砂型氯盐侵蚀的概念.

Diffusion of Sea-sand's Chloride Ions in Concrete by Analysing of SEM-EDS Examination

The Cl^- diffusion feature of concrete made from imitated sea-sand, i.e. the river-sand soaked with NaCl solution, and made from ordinary sand are tested by using SEM-EDS method. It is found that the combination patten and the transmission way of Cl^- are different and for the former there is a diffusion process of ions from the surface of sand to the inner of concrete. And Based on this the thansmission mechanism of Cl^- is discussed and a concept for chloride attack of sea-sand is proposed.