Electrochemical Evaluation of a Stainless Steel as Reinforcement in Sustainable Concrete Exposed to Chlorides

摘要

Corrosion of steel reinforcement is one of the top three causes of deterioration of reinforced concretestructures. For this research three concrete mixtures were produced, the first concrete was made with100 % cement CPC 30R, the second mixture was considered sustainable concrete because using 80 %of cement CPC 30R and 20 % of silica fume and the third mixture was elaborated with 80 % of cementCPC 30R and 20 % of fly ash, these mixtures were designed according to the method ACI 211.1, in thespecimens were embedded bars of AISI 304 stainless steel and AISI 1018 steel, the specimens wereexposed in a solution at 3.5 % of NaCl, simulating a marine environment, for to evaluate the corrosionresistance were used electrochemical techniques of Half-Cell Potential, standard ASTM C-876-09 andthe Linear Polarization Resistance, standard ASTM G59, results Ecorr and Icorr after 180 days ofexposure show that, the best performance was presented concrete specimens produced with 20 % silicafume and reinforced with AISI 304 stainless steel, with corrosion potential (Ecorr) indicating a 10 %probability of corrosion and Icorr values that indicate a passivity level of corrosion.