KINETIC METHOD TO ANALYZE CHLORIDE DIFFUSION IN VARIOUS CONCRETES

The diffusion of hydrated chlorine ions (Cl-) in concrete is influenced by the porosity and the composition of hardened cement paste. Results of the experimental series demonstrate that the addition of aluminates, granulated blast furnace slag or fly ash to ordinary Portland cement considerably reduces the diffusion rate of Cl-. The reduction of the diffusion rate depends not only on the amount and the chemical composition of the additives but also on their mineralogical structure. All these factors are incorporated in the presented mathematical formulation of the Cl- diffusion coefficient.