Reinforcement corrosion and its remediation

This article looks at causes and remediation options for corrosion of reinforcement in concrete, with a case study of one project. The two most important causes are carbonation and chloride contamination. The corrosion causes tensile stress and cracking in the concrete. Remedial options are divided into avoidance and activation. Avoidance, to prevent corrosion, includes the use of anti-carbonation and chloride-resistant coatings, electrochemical chloride extraction, cathodic prevention and corrosion inhibitors. Activation, to stop corrosion which is already initiated, includes the removal of contaminated concrete, electrochemical re-alkalisation, and cathodic protection. Selection of a remedial option depends on the desired service life of the structure and funding availability. The case study is of a wharf access jetty in New Zealand, where impressed current cathodic protection was employed to protect prestressed I-beams; careful specification of the repair process was necessary to minimise the risk of over-protection. (A)

Language

  • English

Media Info

  • Pagination: 28-30
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01043782
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Mar 9 2007 8:24AM