Factors responsible for impairment of durability are identified, and means by which protection may be provided are described. The conditions of high moisture content, prevented or retarded moisture flow and excessive cooling rate occur often in combination and are particularly dangerous. Provision of more camber, a higher crown or a steeper slope is needed to achieve good drainage of horizontal surfaces. In design, allowance has to be made for poor workmanship to prevent the formation of puddles. Waterproofing of concrete pavement eliminates the principle mode of moisture penetration. Success, however, hinges upon the provision of good drainage of roadbed and dryness of the material at the time of sealing. The presence of soluble chemicals in the pores should be avoided because they cover the vapour pressure of the liquid and therefore, for a given relative humidity, increases the degree of saturation. Frost protection in autumn and winter construction activities must be achieved by improving the properties of the building materials. "Hard-dried" bricks should be utilized if there is any likelihood of freezing. The dangers of frost action in concrete may be reduced by densification of the material by lowering the water-cement ratio of the mix.

  • Supplemental Notes:
    • Reprint of Paper No. 414, 2nd International CIB/RILEM Symposium on Moisture Problems in Buildings, Rotterdam, 10-12 September 1974.
  • Corporate Authors:

    National Research Council of Canada

    1200 Montreal Road
    Ottawa, Ontario  Canada  K1A 0R6
  • Authors:
    • Litvan, G G
  • Publication Date: 1974-9

Media Info

  • Features: References;
  • Pagination: 6 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00099298
  • Record Type: Publication
  • Report/Paper Numbers: No. 432 Tech Paper
  • Files: TRIS
  • Created Date: Nov 5 1975 12:00AM