STRENGTH AND DURABILITY STUDIES ON SODIUM NITRITE INHIBITOR IN ORDINARY AND HIGH PERFORMANCE CONCRETE

Abstract

Deterioration of concrete occurs due to physical actions, chemical reactions and electro chemical reactions at steel / concrete interface causing reinforcement corrosion. Among these, reinforcement corrosion is one of the most important causes of deterioration. Reinforcement corrosion induced by chlorides is one of the most frequent causes of corrosion of steel and 40 percent of steel corrodes due to chloride attack. To delay the corrosion process many techniques such as increasing the concrete cover over rebar, reducing water cement ratio, using denser concrete, coating steel with epoxy, use of corrosion inhibitor are available. In the present investigation the effect of sodium nitrite based corrosion inhibitor in concrete is studied. This research involves the comparative study of mechanical properties and durability properties of conventional concrete and high performance concrete in the case of without and with inhibitor. Corrosion studies such as AC impedance, Potential measurement, Linear Polarization Resistance (LPR), Custom sweep and half-cell potential are evaluated using standard concrete test specimens with different dosages of corrosion inhibitor

Keywords

• Ordinary Concrete, High Performance concrete, Corrosion Inhibitor, Corrosion Resistance Tests