粉煤灰和矿渣对表观氯离子扩散系数的影响

Influence of Fly Ash and Slag on Apparent Chloride Diffusion Coefficient of Concretes

采用自然扩散法测定了普通混凝土、粉煤灰混凝土和矿渣混凝土在高浓度的氯盐介质中浸泡180 d后的自由氯离子浓度分布,定量探讨了粉煤灰和矿渣掺量对混凝土氯离子扩散系数的影响规律。结果表明:混凝土的氯离子扩散行为能较好地符合Fick第二扩散定律,而且粉煤灰、矿渣混凝土的表观氯离子扩散系数较普通混凝土要小。进一步分析发现,混凝土的表观氯离子扩散系数与粉煤灰、矿渣的掺量之间符合一元二次多项式关系。

Natural diffusion method was adopted to investigate free chloride concentration profiles of ordinary Portland concrete,fly ash and slag concrete exposed to the chloride medium of high concentration for 180 days.And influence of fly ash and slag contents on the chloride diffusion coefficient of concrete was analyzed quantitatively.The experiment showed that,diffusion of chloride ion into fly ash concrete or slag concrete was proved to coincide with Fick's second diffusion law.The apparent chloride diffusion ...