Corrosion of Steel Reinforcement in Concrete Adjacent to Surface Repairs

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Title: Corrosion of Steel Reinforcement in Concrete Adjacent to Surface Repairs

Author(s): Dale P. Barkey

Publication: Materials Journal

Volume: 101

Issue: 4

Appears on pages(s): 266-272

Keywords: corrosion; reinforcement; repair; steel

Date: 7/1/2004

Abstract:
Reinforced concrete may be damaged by chloride-induced corrosion of steel reinforcement, resulting in spalling and delamination as corrosion products accumulate. A surface repair entails removal of damaged concrete and its replacement with repair material. The resulting inhomogeneity between the repair material and remaining chloride-contaminated concrete, however, may produce active-passive corrosion macrocells that drive rapid anodic dissolution of the metal. This experimental study was undertaken to characterize the geometry, current distribution, and controlling resistance of corrosion macrocells driven by differences in the electrochemical environment in repair material and contaminated concrete. Additional influences such as galvanic contact between the test reinforcement bar and remote cathode bars were also considered. The tests were based on ASTM G 109, with modifications to incorporate simulated repairs.