CHLORIDE AND REINFORCEMENT CORROSION

The presence of chlorides is increasingly being recognised as a contributory factor in the corrosion of reinforcing steel in concrete. Chlorides accelerate the deterioration of reinforced concrete in three ways: (1) the reduction in alkalinity caused by the common ion effect, (2) chloride ions increasing concrete pore fluid and therefore electrical corrosion, and (3) chloride ions in sufficient concentration can overcome the passivating effect of hydroxyl ions permitting rusting of the steel. Studies by ground engineering have also shown that when chloride is present in a wet mix, the heat of hydration is greater compared with normal concrete. This causes a higher level of drying and shrinkage. The effects of microfissuring and carbonation on the deterioration of reinforced concrete are discussed. (TRRL)

  • Availability:
  • Corporate Authors:

    Morgan-Grampian (Professional Press) Limited

    Morgan-Grampian House, Calderwood Street
    London SE18 6QH,   England 
  • Authors:
    • Power, T
    • Hammersley, G
  • Publication Date: 1980-8

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00324964
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: May 21 1981 12:00AM