The author examines the significance of subbase and joint design on concrete road performance suggesting that it is more important than overall thickness in the avoidance of problems arising from cracking and pumping. To prevent subbase erodability only particularly stable materials should be used. The best of low erodability materials are lean concrete and asphaltic concrete. Different types of subbases are reviewed and their relative merits discussed. The method used to design subgrade stiffness is illustrated. Four methods of crack control are discussed; the use of plain unreinforced concrete with joints at 4 to 5 M spacing with and without dowel bars for load transfer, the use of one per cent reinforced concrete with dowelled joints at 12 to 15 M spacings and the use of 0.6 to 0.7 per cent continuously reinforced concrete without joints. Load transfer mechanism are discussed and common methods used are illustrated. Recommendations are made for the type of joint to be used under various traffic conditions. Examples are given of several methods used to seal joints. Dowels are not used in New Zealand for roads with less than 10 to the seventh power eda. (TRRL)

  • Availability:
  • Corporate Authors:

    Concrete Publications Limited

    Securities House, 126 the Terrace
    Wellington,   New Zealand 
  • Authors:
    • Tait, B
  • Publication Date: 1983-10

Media Info

  • Features: Figures; Photos; Tables;
  • Pagination: p. 3-8
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00386079
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jul 30 1984 12:00AM