Effect on the ICCP system from types and arrangement of anodes in reinforced concrete specimens
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Cathodic protection is of two types, namely, sacrificial anode cathodic protection (SACP) and impressed current cathodic protection (ICCP), depending on the method of supply of the protection current. The ICCP method with external DC current is invariably used in an inhomogeneous environment with high resistivity such as reinforced concrete structures. In this method, various factors such as the conditions of reinforcement; mixing ratio of concrete; moisture content; environment-exposed concrete structure; and types, arrangement, usage, and method of installation of the insoluble anode must be taken into account in order to achieve uniform protection throughout the concrete structure. However, the SACP method involves a simple electrical connection between the anode and rebar. The characteristics of the various types of anodes in the cathodic protection methods must be identified precisely. In this study, the performance of the ICCP system was investigated by installing Ti-Mesh, Ti-Ribbon, and Ti-Rod anodes on reinforced concrete specimens. The cathodic protection potentials and depolarization behaviors were measured to confirm the effectiveness of the ICCP system. It was shown that the performance of the ICCP system depended on the arrangement and not the type of anode in the reinforced concrete specimen.
Abstract
Cathodic protection is of two types, namely, sacrificial anode cathodic protection (SACP) and impressed current cathodic protection (ICCP), depending on the method of supply of the protection current. The ICCP method with external DC current is invariably used in an inhomogeneous environment with high resistivity such as reinforced concrete structures. In this method, various factors such as the conditions of reinforcement; mixing ratio of concrete; moisture content; environment-exposed concrete structure; and types, arrangement, usage, and method of installation of the insoluble anode must be taken into account in order to achieve uniform protection throughout the concrete structure. However, the SACP method involves a simple electrical connection between the anode and rebar. The characteristics of the various types of anodes in the cathodic protection methods must be identified precisely. In this study, the performance of the ICCP system was investigated by installing Ti-Mesh, Ti-Ribbon, and Ti-Rod anodes on reinforced concrete specimens. The cathodic protection potentials and depolarization behaviors were measured to confirm the effectiveness of the ICCP system. It was shown that the performance of the ICCP system depended on the arrangement and not the type of anode in the reinforced concrete specimen.
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