干湿循环作用下氯离子在混凝土中的侵蚀过程分析

TRANSPORT PROCESS OF CHLORIDE IN CONCRETE UNDER WET AND DRY CYCLES

干湿循环和氯盐浸泡对比试验表明,在干湿循环作用下,氯离子在混凝土中的传输速度远大于饱水混凝土内外氯离子浓差引起的离子扩散速度,氯离子在上部非饱水混凝土中和在饱水混凝土中的传输机理不同。对上部非饱水混凝土中氯离子的渗透行为进行了机理分析,并建立了干湿循环作用下氯离子传输速度模型,可为准确地预测实际工况混凝土结构的使用寿命提供参考。

The research shows that the rate of chloride transport in concrete under wet and dry cycles is rapider than that in saturated concrete. This means the mechanism of chloride transport process is different in different environments. The mechanism of chloride transport process under wet and dry cycles is studied and a chloride transport model is developed which provides a reference for predicting accurately the service life of an actual concrete structure.