IMPROVEMENTS IN HEAVY DUTY ASPHALT SURFACING

The authors examine the defects of the present system of designing asphalt surfacings. They recommend specific requirements for the current need to withstand heavy traffic volumes and axle loadings and describe how these needs may be met. At present, only two types are commonly specified - hot rolled asphalt to BS594 amd dense macadam to BS4987. Both of these types have limited scope in meeting deformation and skid resistance requirements. A binder is required with low susceptibility to extremes of temperature and a selection and grading of the aggregate is needed to ensure that the mix will carry the highest possible proportion of the binder without appreciable loss of stability or excessive flow. Evidence suggests that this could be achieved by a continuously graded mix such as asphaltic concrete using a fortified binder. Tests on the stability of mixes show that there is apparently no accurate correlation between Marshall stability and deformation on the dry wheel tracking test at 60 degrees centigrade. Designs using polymer asphalt cement binders are suggested to meet the 1.5mm texture depth requirements. The extra cost of binders could be offset by a reduction in the thickness of layers. A flexible performance specification is required, enabling a choice to be made of particular materials suitable to each site. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01426168
• Corporate Authors:

  Embankment Press Limited

  Building 59, GEC Estate, East Lane
  Wembley, Middlesex HA9 7TQ,   England 
• Authors:
  • Buckmaster, C
  • Laitinen, J
• Publication Date: 1981-10

Media Info

• Features: Photos; Tables;
• Pagination: p. 23
• Serial:
  • Highways and Public Works
  • Volume: 49
  • Issue Number: 1858
  • Publisher: D.R. Publications Limited
  • ISSN: 0142-6168

Subject/Index Terms

• TRT Terms: Aggregates; Asphalt concrete; Asphalt pavements; Axle load force; Binder content; Binders; Bituminous mixtures; Deformation; Hot coated materials; Hot rolling; Macadam; Marshall test; Polymers; Rolled asphalt; Rutting; Skid resistance; Specifications; Stability (Mechanics); Surfacing; Temperature; Tests; Texture; Traffic flow; Traffic volume
• Uncontrolled Terms: Particle size distribution; Susceptibility
• Geographic Terms: United Kingdom
• Old TRIS Terms: Asphalt pavement specifications; Marshall stability marshall stability & flow test flow; Tracking (Wheel)
• ITRD Terms: 4577: Aggregate; 3067: Axle load; 4948: Binder; 4929: Binder content; 4967: Bituminous mixture; 5595: Deformation; 4997: Hot coated material; 6200: Particle size distribution; 7481: Polymerization; 4989: Rolled asphalt; 3081: Rutting (wheel); 3031: Skid resistance; 177: Specifications; 5930: Stability; 3053: Surface texture; 2972: Surfacing; 6722: Temperature; 6255: Test; 671: Traffic flow; 8119: United Kingdom
• Subject Areas: Geotechnology; Highways; Materials; Pavements; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00361686
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Jul 30 1982 12:00AM