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Corrosion evaluation of the rebar embedded in self consolidating concrete under marine environment

Abstract:

In this investigation was evaluated the corrosion of ASTM A 706 structural steel embedded in self consolidating concrete (SCC). Two steel bars were inserted in each specimen; they act as working electrode and a graphite electrode at the center of the specimen acts as auxiliary electrode. The environments in which were subjected each concrete were distilled water and water with 3.5 % contents of sodium chloride (NaCl) in weight simulating an aggressive environment. The behavior of the steel was monitored electrochemically by the techniques of linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS). After a six-month exposure under normal and aggressive conditions, the specimens were analyzed using the X-ray diffraction (XRD) technique with the purpose to study in detail the concrete-steel interphase establishing the corrosion products formed during the study. It can be concluded of the electrochemical study that the specimens subjected to NaCl generate a performance status front the specimens subjected to distilled water which have a displacement towards passive corrosion zones. © 2013 by ESG.