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Durability of structures made of steel-reinforced concrete is greatly to scale back the speed of moisture transport or the ingress of aggressive ions. An experimental study to assess the initial corrosion behaviour of Thermo-Mechanically Treated rebar (TMT), Corrosion Resistant rebar (CRS) and Fusion bonded Epoxy Coated rebar (EC) under controlled condition (CC) and in simulated marine environment condition (SME). Rebars of 12 mm dia with a span of 250 mm are enclosed in specimens having and length and breadth of 350 mm and a thickness of 138 mm then initial study was carried out. The corrosion potential is noted throughout the specified duration and once in three days of observing the corrosion potential gives the likelihood of corrosion rise. The A. C Impedance and Polarization resistance methods are used to study the corrosion rate in the surface of the rebar. The polarisation resistance (Rp) of TMT rebar is found to be 1.8 times but that of CRS rebar. A. C Impedance used for EC showed that epoxy coating is harmed and affected because of chloride attack. Initial quantitative study from this research gives clear interpretation of rust production which can be utilized in fragility of the structure.

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Durability of concrete is the essential property for the lifespan of concrete structures. Rusting of steel is the major factor responsible for the loss of durability property. In order to study the corrosion behaviour of three types of reinforcing bars like Thermo-mechanically treated bar(TMT), Corrosion resistant steel (CRS), Epoxy coated rebar(ECR) were experimentally studied. The reinforcing bars having 12 mm diameter were infused in 300×300×75 mm size of concrete slab samples were kept under room temperature and certain samples are spraying with 3% of NaCl solution to attain a simulated marine exposure condition. There are various techniques including Open circuit potential (OCP), Linear polarisation resistance (LPR), Electrochemical impedance spectroscopy (EIS) are used to monitorize the corroding performance of samples. On analysing the results of the electrochemical studies, it could be inferred that the efficient rebar to withstand the corrosive nature by improving the life expectancy of the concrete structure.