Efficiency of Corrosion Inhibitor to Mitigate Carbonation Induced Corrosion

Abstract

Reinforced concrete is one of the most commonly used construction materials in civil engineering but its durability problems have been obsessing people. The worst of these problems is caused by corrosion of steel in concrete, inducing the early deterioration of concrete infrastructures. Structural deterioration of reinforced Concrete structures affected by corrosion is a gradual process consisting of a few different phases during service life, including corrosion initiation, concrete cracking, excessive deflection and final collapse due to loss of structural strength. A number of corrosion mitigation techniques are now a days available. There efficiencies depends upon the reason behind the corrosion of rebar. The purpose of this thesis is to study the effectiveness of corrosion inhibitor in reducing the rate of corrosion against carbonation induced corrosion. Commercial and chemical corrosion inhibitors are investigated for this purpose. This experiment conducted using the carbon hydroxide solution as the base solution. Two types of tests, i.e., Linear polarization Method and Open circuit potential are performed to find out the values of Icorr and OCP. These values further tell us about the performance of corrosion inhibitor on the steel bar. The corrosion monitoring is carried out for a period of 480 hours. It is observed that that type of corrosion inhibitors and its concentration both play an important role in mitigation of corrosion activity