THE PROBLEMS OF CHOOSING MACHINERY FOR CONSTRUCTION OF ALL-BITUMEN (HB) PAVEMENTS

MASKINVALET PROBLEM VID BYGGE AV HB-VAEG

The National Road Administration constructed a test road in order to study the problems in using all-bitumen (HB) pavements, such as strengthening of the subgrade, choice of plant for spreading the pavement, and suitable course thickness. The test road is approx. 1 km long, the subgrade being clay mixed with sand. It was divided into 10 sections, each of which had a different subgrade preparation, pavement thickness and construction method. It has been found that lime stabilisation of the subgrade is suitable if this is reasonably uniform and well compacted clay. If composition is variable, then bituminous gravel (BG) must be spread in such a way that the formation is not broken up. If the clay is very wet, the surface must be lime stabilised. It is best to lay BG by a spreader if the subgrade is strong enough, otherwise a grader must be used. The first course must then be at least 15 cm. The pavement is more even when laid by spreader; 20 cm can however be spread by grader and remainder by spreader. If the subgrade is strong enough then it is best to lay 25 cm course with a spreader, while on weak subgrades 2-3 courses are more suitable. /TRRL/

  • Corporate Authors:

    Byggfoerlaget

    Mariaskolgata 81, Box 17087
    Stockholm 10462 17,   Sweden 
  • Authors:
    • LINDAHL, T
  • Publication Date: 1974

Language

  • Swedish

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 4
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00096786
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jul 15 1975 12:00AM