Study on Performance of Self Regulating Sacrificial Galvanic Anodes With and Without Preconditioning Against Control Specimen and Using Accelerated Corrosion

The increasing number of reinforced concrete structures affected by corrosion makes the study of their protection an import parameter. Usage of different types of surface coatings on rebars for the corrosion protection has not proved to be a reliable system on account of many reasons like reduction in bond stress between the concrete & rebar and so on. The standard procedure of rehabilitation of corrosion affected structural elements. viz., chipping the cover concrete, exposing the rebar, cleaning rebars, applying corrosion protection coating to the rebar, providing formwork, pumping of micro concrete, etc becomes labour intensive and uneconomical in addition to a lot of disturbance caused to the occupants. Hence, sacrificial anodes are being increasingly used during the rehabilitation of corrosion affected Reinforced Concrete (RC) structures. The self regulating anodes comprise of zinc metal covered with porous matrix, which sacrifices itself and protects the corrosion of rebar. The paper presents the results of the study carried out on the performance of sacrificial galvanic anodes installed in RC structural elements with and without preconditioning methods.