In the present investigation, the protector against sulfate corrosion of reinforcing steel AISI 1018, which provides the Eco-friendly Concrete system CPC-SCBA-SF, was evaluated. This system was made with CPC-SCBA-SF cementitious materials, in percentages of 90-5-5 and 80-10-10 respectively, with exposure of the concrete specimens to a 3.5% MgSO4 solution, an experimental arrangement that simulates the foundations of Civil Works such as bridges, buildings, pavements, etc.; in soils contaminated with sulfates. The design of the concrete mixtures was in accordance with the ACI 211.1 method. The behavior of the corrosion potential Ecorr and the corrosion rate (icorr) of the AISI 1018 steel embedded in Conventional Concrete (CC) and in the EC were evaluated during a period of 180 days of exposure to an aggressive environment. The Ecorr values indicate between a 10% risk of corrosion and uncertainty, according to the ASTM C-876-15 standard, but the icorr indicates a negligible level of corrosion but with a tendency towards the activation of the system, with the eco-friendly concrete EC-20 having the best performance.

In the present research, the electrochemical behavior of corrosion in Conventional Concrete (CC) and Sustainable Concrete (SC) made with 80% of Portland Cemment, 20% of Sugar Cane Bagasse Ash and Recycled Aggregates with 50% and 100% was evaluated, AISI 1018 steel bars were embedded in all the specimens, which were exposed to seawater for more than 300 days. For corrosion monitoring, the electrochemical techniques of Corrosion Potential (Ecorr) and Linear Polarization Resistance was used to determine the intensity of the corrosion current (Icorr). The results of Ecorr and Icorr indicate that the sustainable concrete of this study can be used in non-aggressive environments, but not in highly aggressive media such as seawater, since according to the results, its protection against corrosion is weak, with the SC having the worst performance with 100% recycled aggregate.

The electrochemical behavior of the corrosion resistance of AISI 304 embedded in concrete manufactured as indicated by the ACI 211.1 method was evaluated. The specimens were exposed for more than 150 days to highly aggressive marine-sulfated environment, solution with a concentration of 5% NaCl and 5% Na2SO4. The electrochemical technique of Resistance to Linear Polarization (Rp) was used for to determine the corrosion rate (Icorr) and monitoring of corrosion potential (Ecorr). The Ecorr and Icorr results indicate a high level of corrosion for AISI 1018 steel, on the contrary, the electrochemical behaviour of AISI 304 steel according to the values of Ecorr and Icorr, indicate a corrosion resistance of up to 10 times higher when exposed to an environment with a high concentration of chlorides and sulfates.