Author : Vinaya V Deshmukh 1
Date of Publication :24th January 2018
Abstract: Corrosion, a result of chemical or electrochemical actions, is the most common mechanism responsible for deterioration of reinforced concrete (RC) structures. The phenomenon of corrosion is mainly governed by ingress of chloride ions or carbonation of RC structures. Both these actions cause a breakdown in the passive layer of concrete around the reinforcing steel resulting in active corrosion. Hence, monitoring of reinforcement corrosion is of significant importance for preventing premature failure of structures. The corrosion in RC element can take place in two ways – macrocell and microcell corrosion. Macrocell corrosion occurs when the actively corroding bar is coupled with another bar which is passive, either because of its different composition or because of the different environment. On the other hand, microcell corrosion is the term given to the situation where active corrosion and the corresponding cathodic half-cell reaction take place at adjacent parts of the same metal. The aim of present paper is to study the influence of macrocell corrosion for coupled rebars using electrochemical techniques. RC slabs with four coupled reinforced steel bars were cast and subjected to accelerated corrosion. Two different grades of steel were used in the experimental work. From present research work, it can be concluded that corrosion condition of a coupled rebars can be identified more accurately using Tafel extrapolation technique than half call potential technique and the effect of microcell and macrocell corrosion on behaviour of all rebars under corrosion is approximately same
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