Ternary mixtures of concrete with Portland, fly ash and finely ground granulated slag were produced to investigate their effects on the compressive strength and corrosion resistance. Portland cement was partially replaced by alternative materials with water / cement ratio (w / c) of 0.50. The mechanical strength it was evaluated by compression tests and the corrosion resistance using Half-cell potentials. The results indicate that fly ash and blast furnace slag, greatly reduce the chloride permeability of concrete and increases the corrosion resistance both short- and long- time evaluation. Therefore it is concluded that to control the corrosion resistance in the presence of chloride ion, including pozzolan is an effective method.