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The corrosion of reinforcements in recycled aggregates (RA) structures could be triggered by chloride attack. Ground granulated blast furnace slag (GGBS) has been recognized a significant cement replacement to improve chloride resistant of concrete. However, the study aimed at time-dependent chloride diffusion of recycled aggregates concrete (RAC) with GGBS was still scarce. Thus, with the data generated at varying immersion durations from long-term bulk immersion tests, the effects of the content of ground granulated blast furnace slag (GGBS) and immersion time on time-dependent chloride diffusion were studied. The results indicated that the apparent diffusion coefficient ( D app ) of recycled aggregates concrete decreases with immersion time. Moreover, the total chloride concentration decrease with the increase of GGBS replacement. When increasing the content of GGBS from 0% to 30%, the value of  D app  decreases from 28.9% to 52.2%, while 67.2%∼40.6% of reduction was observed on  D app  with the addition of 60% GGBS at different immersion time.

A Laboratory Analysis of Chloride Ions Penetration in Recycled Aggregates Concrete Admixed with Ground Granulated Blast Furnace Slag