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Effect of Microstructures on the Corrosion Behavior of Reinforcing Bars (Rebar) Embedded in Concrete
Prvan Kumar Katiyar,Prasanna Kumar Behera,Sudhir Misra,K. Mondal 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.5
This work aims at understanding the effect of microstructures (coarse, medium and fine ferrite–pearlite, martensite andtempered martensite) of a reinforced (rebar) steel developed by various heat-treatments (furnace cooling, air-cooling, forceair-cooling, quenching, and tempering, respectively) on its corrosion behavior in freely aerated 3.5% NaCl + 3.5% FeCl3solution. The impressed current technique was used for forcing corrosion of the rebar, which was embedded in concretecoupon, so that correlation could be drawn between microstructure and corrosion behavior in short duration. Corrosionsusceptibility increased from force air-cooled–quenched–air cooled–furnace cooled–tempered steels. The crack formationin the concrete was directly related to the rust composition and thickness, presence of crack in the rust, alpha/gamma* ratioand critical corrosion amount.