In the present work, contribution of supplementary cementitious materials (SCM) such as sugarcane bagasse ash (SCBA) and fly ash (FA) in the reduction of the corrosion phenomenon in AISI 1018 carbon steel as reinforcement during 24 hours of concrete setting was studied. The design of ternary concrete systems was carried out according to ACI 211.1 method. Ash percentages were 10 and 30% of SCBA and FA combined. During the electrochemical study, corrosion potential (Ecorr ) and electrochemical noise (EN) of AISI 1018 carbon steel was monitored. Time series of current and potential, as well as the corrosion current density (icorr), noise resistance (Rn), localization index (LI) and corrosion rate (Vcorr) were analyzed. Results show that concretes added with SCBA and FA presented a better anticorrosion behavior, especially ternary concrete system added with 10% of combined ash, corrosion rate decreased 55% against the reference concrete.

In this research, the corrosion evaluation of carbon steel (AISI 1018) and galvanized steel embedded in ternary concretes was carried out with the electrochemical techniques of Linear Polarization Resistance (LPR) and Electrochemical Noise (EN). Concretes were elaborated with relation to a/c = 0.45, and it was carried out the partial substitution of the ordinary portland cement (OPC) in 10, 20, and 30% by sugar cane bagasse ash (SCBA) and fly ash (FA). According to the EN analysis, the corrosion rate (Vcorr) is obtained as an indicator of the degradation of AISI 1018 and galvanized steels, where it is observed that the steels embedded in 15S15F concrete present an average decrease of Vcorr of 19 and 90% respectively, with respect to the steels embedded in REF concrete.