Behavior of apparent chloride diffusion coefficient of fly ash concrete under long-term marine exposure

摘要

In this study, outdoor exposure tests were performed for fly ash concrete considering long-term marine exposures and mix conditions. Different fly ash substitution ratios, water-binder ratios, regional exposure conditions, and exposure periods were considered. As the exposure period increased, the effect of the water-binder ratio on the apparent chloride diffusion coefficient decreased due to reduced chloride ingress. The increase in the diffusion coefficient with the water-binder ratio in concrete with ordinary portland cement was higher than that in fly ash concrete cement. Relationships between the apparent diffusion coefficient and RCPT (Rapid Chloride Penetration Test: passed ion charge) based on mix proportions were proposed with three regional exposure conditions.