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A review of research work in the literature to date for both laboratory and field evaluations, toward identifying technically relevant situations where the use of sacrificial anodes may or may not be a practical option for reinforcement protection in concrete structures.
In recent years the use of sacrificial anodes for cathodic protection in reinforced concrete structures has increased reflecting ease of installation low maintenance requirements as well as desirability in prestressed concrete structures where the naturally controlled protection potential decreases the risk of hydrogen embrittlement.Zinc-based alloys have been among the most evaluated galvanic materials for concrete structures especially in USA in many applications: thermal spray superficial metal/mesh with and without hydrogel adhesive embedded in concrete (point anodes) with or without salt activator etc. However the protection capacity lifetime of zinc alloys as used has been questioned based both on laboratory and on field application studies. Aluminum alloys have also been evaluated showing sometimes better results as anode materials than zinc alloys. However both zinc and aluminum alloy anodes may experience limited applicability in concrete structures exposed only to atmospheric conditions. as opposed to those in immersed wave and splash zone service.This paper presents a review of the research work in the literature to date both for laboratory and field evaluations toward identifying technically relevant situations where the use of sacrificial anodes may or may not be a practical option for reinforcement protection in concrete structures.
Key words: Sacrificial Anodes, Reinforced Concrete, Zinc, Aluminum.
A case study of a major CP system operating in Australia for 15 years and proposal of a series of changes to current practices which can be considered for implementation in the design, installation and monitoring stages of new impressed current cathodic protection systems in concrete.
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The use of cathodic protection has become the preferred method for mitigating corrosion of steel reinforcement in concrete. A wide variety of both impressed current and sacrificial systems have been effectively used to control the effects of corrosion.