模拟海砂混凝土中氯离子扩散研究

Research of chloride diffusion in sea sand concrete

采用3%浓度的NaCl溶液浸泡河砂模拟海砂,选取海砂颗粒周围的凝胶表面作为扫描区域,定量分析了氯离子在砂子近端和远端的含量,结果显示海砂型氯离子存在一个从海砂表面到水泥凝胶的扩散过程,在此基础上提出海砂型氯离子扩散的概念,并结合微观试验结果讨论了扩散过程。

A new method to simulate sea sand is used,which adopted the 3% sodium chloride solution to immerse river sand,then chose the gel surface around the simulated sea sand particles as a scan region, and quantitatively analyzed the chloride contents at the proximal end and distal end of sand particle.The results showed that,the sea sand chloride have a diffusion process from the sea sand surface to the cement gel,on this basis,we put forward a concept for the sea sand chloride diffusion, and then discussed the diffusion process with the microscopic test results.