西部氯盐渍土地区混凝土中氯离子结合能力研究

Study on Chloride Binding Capacity of Concrete in West Chlorine Saline Soil Region

为研究西部氯盐渍土地区混凝土中氯离子结合能力,采用高浓度氯化钠溶液,进行了混凝土长期浸泡试验,对混凝土中结合氯离子含量分布规律、结合氯离子含量与自由氯离子含量的关系、氯离子结合能力随扩散深度和浸泡时间的变化规律,以及环境对氯离子结合能力的影响进行了研究。结果表明,结合氯离子含量沿扩散深度呈现出先增长后降低的规律,存在含量峰值,在同一扩散深度处,约为自由氯离子含量的56%。氯离子结合能力试验值沿扩散深度和浸泡时间呈波动变化规律,其值明显高于其他氯离子环境,受环境影响明显。

In order to study the chloride binding capacity of concrete in west chlorine saline soil region, high concentration sodium chloride solution was used and long term immersion test of concrete was performed. Some contents were analyzed, such as distribution of binding chlorine, relation of binding chlorine and free chlorine, changes of chloride binding capacity along diffusion depth and immersion time, and the influence of environment on chloride binding capacity. The results show that binding chlorine content increases firstly and then decreases along diffusion depth, and that content peak exists. Ratio of binding chlorine and free chlorine is 56% in the same diffusion depth. Test values of chloride binding capacity fluctuate with diffusion depth and immersion time, they are different from ones in the other environment and affected obviously by the environment.