THE CHLORIDE ION CONTENT OF CONCRETE AGGREGATES FROM SOUTHERN ONTARIO

The corrosion of reinforcing steel in concrete is a major cause of the deterioration of concrete bridge decks in Ontario. The concentration of chloride ions in concrete is one of the controlling factors of corrosion. Corrosion does not occur if the chloride content is below the threshold value of about 0.04 percent chloride ion by weight of concrete. An investigation was made into a major source of crushed concrete aggregate used in southern Ontario. The chloride ion content of the amabel and lockport dolomites (0.041 and 0.026 percent by weight chloride ion respectively) exceeds specifications imposed in Europe for aggregates used in reinforced and prestressed concrete. The study concluded that with the extremely large pore size of the dolomites, resulting in a low degree of saturation even at high humidities, the transport of significant quantities of chloride ions into the pore solutions is difficult. (TRRL)

  • Corporate Authors:

    Ontario Ministry of Transportation & Communic, Can

    1201 Wilson Avenue
    Downsview, Ontario M3M 1J8,   Canada 
  • Authors:
    • Rogers, C
    • Woda, G
  • Publication Date: 1977-12

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 37 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00310248
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada
  • Report/Paper Numbers: Report EM 17 Monograph
  • Files: ITRD, TRIS
  • Created Date: Jul 22 1980 12:00AM