CRACKING AND THE MIDDLE EAST

Forms of cracking and deterioration of concrete directly related to the presence of salts in the ground and in the aggregates are discussed. The commonest aggressive salts are calcium sulphate, magnesium sulphate and sodium present study attempts all of these tasks. The study attack which can occur together or separately are sulphate attack and salt weathering. Over 50 percent of samples of cracked concretes adjacent to corroded reinforcement had chloride contents in excess of 4.0 percent by weight, and over 95 percent were in excess of 1 percent. It is suggested that chloride levels in general purpose concretes should not exceed 0.50 percent (preferably less) by weight of cement. For unreinforced concretes made with aggregates which are not deleteriously reactive with alkali, a level of chloride not exceeding 1.0 percent by weight of cement is suggested. Comments are made with regard to aggregates, grout, and repairs to concrete cracked by chloride related corroded steel. The possible effects os sulphates in concrete are tabulated, and it is suggested that the total sulphate content of reinforced and nonreinforced concrete should not exceed 40 percent by weight of cement including the weight sulphate present in the cement.

  • Availability:
  • Corporate Authors:

    Cement and Concrete Association

    52 Grosvenor Gardens
    London SW1W 0AQ,   England 
  • Authors:
    • FOOKES, P G
    • COLLIS, L
  • Publication Date: 1976-2

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 14-19
  • Serial:
    • CONCRETE
    • Volume: 10
    • Issue Number: 2
    • Publisher: THE CONCRETE SOCIETY
    • ISSN: 0010-5317

Subject/Index Terms

Filing Info

  • Accession Number: 00131571
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 22 1976 12:00AM