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Manual on Service Life of Corrosion-Damaged Reinforced Concrete Bridge Superstructure Elements (2006) / Chapter Skim
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Pages 21-25

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From page 21...
... The effectiveness of a corrosion control system very much depends on the level of contamination of chloride ions in the concrete and the severity of chloride ion exposure. The barrier systems that are applied onto the surface of the concrete element are most effective when applied either to a repair or to C H A P T E R 4 Selection of Corrosion Mitigation Alternatives
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From page 22...
... If the chloride ions are close to or above the threshold, a more aggressive corrosion control system such as cathodic protection or electrochemical chloride extraction may be required. However, if the distribution of chloride ions makes it insufficient to initiate corrosion at the time of the evaluation or to reach the threshold (at the steel depth)
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From page 23...
... Fr eq ue nc y Chloride Ion Distribution for Susceptibility Index 3 0 0.0002 0.0004 0.0006 0.0008 0.001 0.0012 0.0014 0.0016 0.0018 0 200 400 600 800 1000 Chloride Ion Concentration (PPM) Fr eq ue nc y Figure 2.
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From page 24...
... They are most often only exposed to the corrosive environment in areas where the expansion joints in the deck have failed and chloride-contaminated water is running off onto the beams and girders. Therefore, these superstructure elements most often only require repairs and a local corrosion control system.
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From page 25...
... However, these types of repairs are effective only when the susceptibility of the sound concrete to corrosion is low and the SI is equal to or greater than 4. When the concentration of chloride ions in the concrete is sufficient to result in a SI of 4 or less, more aggressive corrosion control systems such as corrosion inhibitors, cathodic protection, and electrochemical chloride extraction must be considered.
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Key Terms

  • repair options
  • service life
  • susceptibility index
  • superstructure elements
  • reinforced concrete

  • structure elements
  • corrosion control
  • cathodic protection
  • chloride ions
  • condition evaluation

  • steel depth
  • chloride extraction
  • chloride ion
  • ion distribution
  • ture elements

  • mitigation alternatives


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