Modeling Chloride Transport in Concrete at Pore and Chloride Binding

摘要

The present study concerns modeling of chloride diffusion inconcrete by reflecting the pore size distribution and binding ofchloride in the cement matrix. As factors that influence the chloride dijfusion, water-cement ratio fw/c) and replacement ratiofor blended cement concrete were taken. As a result, it was foundthat an increase in w/c and a decrease in the replacement ratioresulted in an increase in the fraction o f effective pore volume forchloride transport, while chloride binding capacity decreases withw/c and increases with the replacement ratio. Also, the higherchloride binding capacity could cause an increase in total chlorides at concrete surface, which could enhance the concentrationbuildup rate at smaller cover depth in the long term. However, afterreachriig the limited chloride binding capacity, the diffusion coefficient decreased with time, implying that a reduction o f the diffusionrate could be attributed to the chloride binding.