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This study was carried out to evaluate the influence of addition of a pozzolanic admixtures(fly ash and silica fume, a blast furnace slag) on the concrete permeability. The main experimental variables were the water-cementitious material ratios, the types and amount of admixtures, and the curing time. And tests have been carried out on concrete containing pozzolanic admixtures to measure their permeability coefficient using water and oxygen, chloride ion, and compressive strength, and the porosity and pore size distributions by mercury intrusion porosimetry(MIP). The results show that the concrete containing pozzolanic admixtures exhibited lower permeability coefficient than the plain concrete. The significant reduction in permeability(water and oxygen, chloride ion) of concrete with pozzolans due to formation of a discontinuous macro-pore system which inhibits flow. It is shown that there is higher relationship between permeability and parameters of pore structure(such as porosity and pore size distribution), and permeability and compressive strength, and water or oxygen permeability and chloride ion permeability(charge passed) based on electrical conductance.