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This paper describes a multi-factor model of chloride diffusion coefficient of long-age (180d) cured concrete with high-volume mineral admixture. The RCM (rapid chloride migration) tests were conducted on 15 specimens with different mixtures proportions to analyze the effect of the water/binder ratio, the total content of mineral admixture, the different combination of FA (fly ash) and GGBS (ground granulated blast-furnace slag) on the chloride diffusion coefficient. Based on the data of orthogonal experiments, a multi-factor coupling model of chloride diffusion coefficient of 180d cured concrete is developed through regression analysis, which can be verified by the data in full range design. The experimental results show that the water/binder ratio, the content of FA and GGBS have a certain impact on the chloride diffusion coefficient, and the predicted values from multi-factor coupling model of chloride diffusion coefficient is in good agreement with the experimental data.

A Multi-factor Model of Chloride Diffusion Coefficient of 180d Cured Concrete with High-volume Mineral Admixture