Bond Deterioration Dueto Corrosion of Reinforcing Steel


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Title: Bond Deterioration Dueto Corrosion of Reinforcing Steel

Author(s): C. Y. Lin

Publication: Special Publication

Volume: 65


Appears on pages(s): 255-270

Keywords: beams (supports); bond (concrete reinforcement); corrosion; cracking (fracturing); crack width and spacing; deterioration; electrolysis; exposure; impressed current protection; loads (forces); marine atniospheres; reinforced concrete; reinforcing steels .

Date: 8/1/1980

Electrolysis has been used to investigate the deterioration of flexural bond in reinforced concrete structures under combined effects of exposure to marine environment and heavy sustained loads. Beams were loaded to develop specific crack widths, and loadings were then maintained to simulate the service condition. Direct current was impressed on the beams to accelerate corrosion of reinforcement so that the crack of concrete could be observed within the time limit of this investigation. The effects of impressed current on the reinforced concrete in relation to the crack width, sustained load and overload are described. Beams designed with tension reinforcement overlapped at midspan were subjected to impressed current until the concrete cracked. The average ultimate bond stress of the cracked beams was calculated based on the tension force developed in the reinforcement. A reduction in average ultimate bond stress due to corrosion of reinforcement is reported.