###### Abstract
For instance, some have proposed higher quality concrete mixes, as well as the effects of concrete containing corrosion inhibitors [33; 34; 35; 36]. Additional approaches include microencapsulated corrosion inhibitors [37], application of epoxy coatings [38; 39; 40], alternative reinforcement steels such as stainless steels [41; 42; 43; 44; 45; 46] and galvanized steel [47; 48; 49; 50; 51; 52]. Furthermore, various investigations have been developed where agro-industrial and industrial residues have been used as partial substitutes for OPC, known as supplemental cementitious materials (SCMs). SCM, when incorporated into the concrete, improves the resistance to aggressive ions via promoting a more dense and less permeable concrete matrix. This is due to the pozzolanic characteristics of these residues [53; 54] and allows the production of concrete that are more resistant to chloride and sulfate ion ingress. Among the main SCMs that have demonstrated the highest corrosion resistance are silica fume, granulated blast furnace slag, fly ash, metakaolin, rice husk ash, and sugar cane bagasse ash [55; 56; 57; 58; 59; 60; 61; 62; 63]. Sugar cane bagasse ash (SCBA) as a partial substitute for OPC has shown considerable benefits when used for the preparation of concrete mixtures, significantly increasing its durability. These concretes made with SCBA are known in the scientific community as ecological concretes, sustainable concrete, green concretes or eco-friendly concretes [64; 65; 66]. This is due to the incorporation of the SCBA in replacement percentages ranging from 5% to 30%. This replacement has a direct impact on caring for the environment, first for using an agro-industrial waste, that in Mexico still does not have a specific use, and second for reducing the use of OPC, which means a reduction in CO\({}_{2}\) emissions. Although there are many works on the use of SCBA as a substitute for OPC to produce eco-friendly concretes, it is important to mention that work is being carried out for its application in the construction of sustainable roads [67; 68]. This present a great opportunity in the countries where the highest production of this residue is generated. This research evaluates the corrosion behavior of conventional concrete (CC) made with 100% CPC 30R and two binary sustainable concrete (BSC1 and BSC2) made with SCBA and SF, BSC1 made with 10% SCBA as a substitute for CPC 30R and the second made with 10% SF as a substitute. Reinforcing steel rebars of AISI 1018 carbon steel (CS) and galvanized steel (GS) were embedded and exposed for more than 300 days to a sulfated medium (3.5% solution of MgSO\({}_{4}\)). This concentration was used to simulate an aggressive environment that contains sulfates where civil works can be built based on reinforced concrete, such as the foundation soil, contact with wastewater and marine environments, among others. The results obtained from the corrosion current intensity (\(i_{\text{corr}}\)) in CC, BSC1 and BSC2, have allowed us to understand the corrosion kinetics of GS used as a reinforcement in eco-friendly concrete exposed to a sulfated medium. Furthermore, the enhanced corrosion resistance of these concretes would promote the use of agro-industrial and industrial waste to manufacture sustainable and ecological concretes that contribute to a sustainable development of our society.