PRECAUTIONS AND REPAIR METHODS

This paper describes a wide range of viable and mostly well-proven methods of protecting against the corrosion of reinforcement in concrete, and repairing such damage when it occurs. The limitations of each technique are emphasised, in terms of design life, economic considerations, technical feasibility, etc. The final choice of technique depends on many factors, including: (1) cost, which is usually the primary consideration; (2) the method's future maintenance requirements; (3) requirements for periodic rehabilitation during a structure's design life; and (4) appearance, especially for some 'high profile' structures. The durability of reinforced concrete structures can be described in terms of: (1) mix design; (2) manufacture; and (3) additional protection measures. The following repair methods are described: (1) structural repairs; (2) patch repairs; (3) electrochemical removal of chlorides; (4) electrochemical re-alkalisation; and (5) cathodic protection. The relative costs of the different repair techniques depends on many factors. During comparative assessments of repair systems, desalination was found to be the most economic method of achieving a 20-year design life, with 70% of the cost of cathodic protection and 35% of the cost of patch repairs. For the covering abstract see IRRD 880139.

Language

  • English

Media Info

  • Features: References;
  • Pagination: 13 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00724170
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-7210-1495-X
  • Files: ITRD
  • Created Date: Aug 19 1996 12:00AM