在混凝土中氯盐对硫酸根离子扩散性能的影响

The Effect of Chloride on Concrete under Sulfate Attack

通过单一硫酸盐环境以及氯盐和硫酸盐共同环境中混凝土的浸泡腐蚀试验,研究腐蚀环境中氯盐的存在及其浓度变化对硫酸根离子在混凝土内部扩散性能的影响。结果表明,氯盐的存在可延缓硫酸根离子在混凝土内部的扩散;氯盐的存在能够降低硫酸根离子含量随时间增长的幅度,且氯离子浓度越大,这种降低作用越明显。

The specimens of concrete were immersed into single chloride solution, single sulfate solution and composite solution respectively; the compressive and flexural strength of concrete were tested at different immerse ages. The results indicate that the presence of chloride in composite solution can delay the damage of concrete, and the higher the concentration of chloride in composite solution, the more obvious the delayed effect. Chloride ions can react with hydration products of concrete and generate hydrated calcium aluminum chloride.