CRACKING: WHAT ARE CRACK WIDTH LIMITS FOR?

Crack widths have to be controlled to limit the risk of corrosion of reinforcements; cracks can also be unsightly. The article reviews research on cracked beams exposed in natural environments. The fundamental nature of a crack, and the chemistry of corrosion near a crack are considered. It is apparent that there is no significant relationship between corrosion and crack widths. It is felt that no useful purpose can be served by defining crack widths as a function of the environment and using designs which ensure these limits are not exceeded. However the checking of crack widths in design may be necessary to avoid the occurrence of unsightly cracking or to ensure that the construction is watertight. The author discusses the factors affecting the formation and visual appearance of cracks. The definition of permissible widths on a totally different basis to those used in most current codes needs more research. /TRRL/

  • Availability:
  • Corporate Authors:

    Cement and Concrete Association

    Wexham Spring
    Slough SL3 6PL, Buckinghamshire,   England 
  • Authors:
    • Beeby, A W
  • Publication Date: 1978-7

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 31-33
  • Serial:
    • CONCRETE
    • Volume: 12
    • Issue Number: 7
    • Publisher: THE CONCRETE SOCIETY
    • ISSN: 0010-5317

Subject/Index Terms

Filing Info

  • Accession Number: 00184429
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jan 13 1979 12:00AM