This work examines the corrosion behavior of reinforcing steel RC embedded in concrete mixes of various types by incorporating both Ordinary Portland Cement Type I and Sulfate-Resistance Portland Cement Type V and Blends with Fly Ash PFA or Slag GGBS. The RC specimens were exposed to wet-dry cycles of chloride andor sulfate solutions. Theory predicts that under such conditions the electrode potentials of the steel can suffer the formation of anode and cathode regions that depend on cement type and the local environment, so localized corrosion may occur. The final results in this book concludes that using two concrete types in the same structure will lead to the preferential formation of anode and cathode sites. Moreover, this has implications for the durability of real structures whereas the steel, either through design or repair, is embedded in more than one concrete mix type. Furthermore, the results showed that green concrete - containing either 30 Pozzolan or 70 Slag - had the best