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  The Successful Use of Galvanized Rebar for Corrosion Protection of Concrete Reinforcement

  Hot-dip galvanized (HDG) reinforcing steel is bare reinforcing steel coated with a protective layer of zinc metal. The zinc coating serves as a barrier to corrosive elements that the rebar is exposed to when embedded in concrete. In addition to the barrier protection that the zinc provides, it also provides a level of cathodic protection where the zinc will preferentially corrode when in contact with bare steel (e.g. a void or hole on the surface of the galvanized will be protected by the surrounding zinc.) Zinc (galvanized) also possesses other favorable corrosion characteristics when embedded in concrete which make it an effective coating material for corrosion resistance. The mechanisms of rebar corrosion in tunnel environments will be reviewed. The benefits of use of galvanized rebar will then be introduced.

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