Effect of GGBS on chloride diffusion coefficients of cement mortar

The effects of Ground Granulated Blast Furnace Slag (GGBFS) and fly ash on the chloride diffusion behavior of cement mortar at early and later ages are examined in this paper. A kind of rapid chloride-ion diffusion tests was applied to evaluate the diffusion coefficients of cement mortar incorporating with GGBFS or fly ash. It is indicated that the chloride ion diffusion coefficients of cement mortar containing GGBFS decreased significantly at 14 and 28 days. Fly ash will further reduce the chloride diffusion coefficient of GGBS modified cement mortar. The optimum content of GGBS is 50 wt.% of cement.