SAND-BITUMEN FOR ROAD BASES: AN EXAMINATION OF FIVE METHODS OF MEASURING STABILITY

In many tropical countries there are regions in which bitumen stabilisation is the only practicable method of constructing roads. The rapid increase in traffic loads in these countries has accentuated the need for criteria for the design of sand-bitumen bases. This report describes an investigation of the use of the Marshall test, the Hubbard-Field test* the cone-stability test, and the deformation wheel-tracking test to measure the stability of a range of sand-bitumen mixes that were incorporated in full-scale experimental road sections constructed in northern Nigeria in 1960. The stabilities of the mixes at 45 degrees C and 60 degrees C as measured by these four methods are compared and related to the performance of the mixes in the full-scale experiment after twelve years of trafficking. It is concluded that both the Marshall and the Hubbard-Field tests are appropriate for designing bitumen-stabilised sands, and that the deformation wheel-tracking test correlates well with both of them. The cone-stability test however does not give a very satisfactory guide to performance. A Marshall stability of 100 kg at 60 degrees C, or a hubbard-field stability of 300 kg at 60 degrees C, are suggested as criteria for the design of sand-bitumen base mixes for lightly-trafficked roads in hot climates.(a) /TRRL/

  • Availability:
  • Corporate Authors:

    Transport and Road Research Laboratory (TRRL)

    Wokingham, Berkshire  United Kingdom 
  • Authors:
    • HITCH, L S
    • Russell, RBC
  • Publication Date: 1976

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 41 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00147934
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: TRRL Lab Rpt LR 717 Monograph
  • Files: ITRD, TRIS, ATRI
  • Created Date: Aug 4 1977 12:00AM