STUDIES OF THE DESTRUCTION MECHANISM AT FREEZING OF POROUS MATERIALS

Critical degrees of saturation are considered, frost resistance is defined, the critical distance is discussed, the relation between critical distance and critical air content is considered, and comments are made on the existence of a critical degree of saturation and freezing mechanisms. Freezing with pure water and freezing with salt water in the pore system is described, and three ways are shown for defining the critical degree of saturation. In conditions of freezing with pure water in the pore-system, frost resistance (F) may be defined as F-critical degree of saturation minus the actual degree of saturation. Conditions, however, change in the presence of a deicing agent. It has been proven that critical distances (the thickest completely water-saturated materials volume that may freeze without damage) exist in connection with freezing. A purely geometrical relation exists between the critical distance, the air filled pore-volume and the size of the air bubbles. The existance of a critical degree of saturation is a necessary consequence of the existence of a critical air content. Mechanisms of the freezing of pure water and of salt solutions is detailed.

  • Supplemental Notes:
    • Presented at the 6th International Congress on Problems Raised by Frost Action. Le Havre, France, April 23-25, 1975.
  • Corporate Authors:

    Cement and Concrete Research Institute

    Drottning Kristinas Vaeg 26
    Stockholm 70,   Sweden 
  • Authors:
    • Fagerlund, G
  • Publication Date: 1976

Media Info

  • Features: Figures; References;
  • Pagination: 28 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00141081
  • Record Type: Publication
  • Report/Paper Numbers: CBI 1:76
  • Files: TRIS
  • Created Date: Oct 6 1976 12:00AM