Longitudinal cracks caused by uneven frostheave in the roads cross section may well occur in spite of a strong pavement construction with sufficient bearing capacity. Such cracks indicate the possibility of quick deterioration of the pavement, and the necessity of frequent repavings. On roads like these, repaved without any precautions taken against cracks, similiar cracks normally develop very soon in the new pavement. If the pavement has sufficient bearing capacity, replacement of the materials down to the frostproof depth, or frost protection in other forms are often very expensive. Reinforced bituminous pavements could be an alternative solution in these cases. Research on this has been carried out at The Norwegian Road Research Laboratory. The research started in 1964, and has covered both steel -- and synthetic reinforcements. The first test sections were very short ones, and the aims were to see if the method worked at all, and to try different types reinforcement. Several different methods, types and amounts of reinforcing have been tried. In 1973 a test section of a length of about 3 km was reinforced by steel and repaved to gain practical experience on a larger scale. Measurements indicate that longitudinal cracks may develop when the eneven heave (the difference between the heave in the middle of the road and on the edge), exceeds 20 mm. The stress in the pavement will then be about 6000 kg/m in a pavement of normal width, say 6 to 7 meter. The test sections indicate that reinforcement prevents these longitudinal cracks developing and that reinforcing is easy to perform. The cost of sufficient reinforcement will rise to about 12,00 pr. sq m for steel, and to about 17,00 pr. sq m for synthetic reinforcement (1976-prices). /Author/

  • Corporate Authors:

    Norwegian Road Research Laboratory

    Gaustadalleen 25, Postboks 8109
    Oslo 3,   Norway 
  • Authors:
    • Hansen, E
  • Publication Date: 1978-12


  • Norwegian

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00194295
  • Record Type: Publication
  • Source Agency: Norwegian State Highway Laboratory
  • Report/Paper Numbers: Report No 51
  • Files: ITRD, TRIS
  • Created Date: Jul 11 1979 12:00AM