STUDY ON CORROSION RESISTANCE IN CONCRETE BY MINERAL ADMIXTURE ADDITION AND FRP WRAPPING OF REINFORCEMENT BARS

Corrosion is a major concern in structural applications due to its detrimental effect which reduces the lifespan of the structures, particularly in coastal areas. The main sources of corrosion in concrete are chloride intrusion and carbonation. Due to corrosion, the spalling and delamination of the concrete due to the expansion of steel is unavoidable. Hence, the steel reinforcement bars are to be protected from corrosion so that the structure remains safe. In the present paper, modifications are done for steel using Fiber Reinforced Polymer (FRP) wrapping and the concrete is modified by doping with Zeolite and Micro Silica. The corrosion resistance offered by the specimens is monitored by Half-cell potential method, Open circuit potentials (OCP), Linear Polarization Resistance (LPR) and Tafel Polarization techniques. As there are modifications in steel and concrete, water absorption , compressive strength and bond strength of the specimens are checked and are compared with control specimens.