A road trial of asphaltic wearing course materials designed to a new method was laid in Staffordshire in December, 1970. By attention to the principles of aggregate grading, choice of aggregate of high resistance to polishing and use of the concept of blending aggregates to maintain desirable macrotextural features, the mixes were specially designed to possess good frictional properties at all speeds within the anticipated range. A length of BS 594 wearing course mix using aggregate from the same source was laid at the same time for control purposes. Preliminary laboratory tests with the Variable Speed Internal Drum Machine (VSIDM) are described together with other tests carried out to determine strength properties. Periodic assessment was made of the skid resistance of the new surfacings, compared with that of the BS 594 mix, by means of the Transport and Road Research Laboratory pendulum tester and by front wheel braking tests with a Jaguar of the Dunlop Ltd. Test fleet. Most of the test strips showed consistently higher skid resistance values than the control BS mix. /TRRL/

  • Availability:
  • Corporate Authors:

    Institution of Highway Engineers

    27 Earl Street
    Maidstone, Kent ME14 1PE,   England 
  • Authors:
    • Lees, G
    • SHARIF, R L
  • Publication Date: 1973

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 4-20
  • Serial:
    • Highway Engineer
    • Volume: 20
    • Issue Number: 6
    • Publisher: Whitehall Press Limited
    • ISSN: 0306-6452

Subject/Index Terms

Filing Info

  • Accession Number: 00083207
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jul 2 1975 12:00AM