Study about the relationship between W/C ratio and concrete permeability and concrete reinforcement steel corrosion already done and some conclusions are drawn. The infiltration of O2 and H2O into concrete body is the way to bring together the corrosive components to the surface of reinforcement steel inside the concrete. Chloride and CO2 infiltration supporting the corrosion process by chemically lowering the concrete pH. Permeability and W/C ratio became important factors beside external factors. Literature studies have shown that concrete reinforcement steel will health when the pH of steel stabilized at 12 and permeability of concrete will at best value of 0.4 and poor at 0.7