TRIAXIAL TEST PROCEDURES TO PREDICT THE VOIDAGE WITHIN WEARING COURSE HOT ROLLED ASPHALT. DURABILITY AND PERFORMANCE OF BITUMINOUS HIGHWAY MATERIALS, HATFIELD POLYTECHNIC, 3-4 APRIL 1989

This paper describes research whose objective was to define material parameters which influence the stiffness (or workability) of wearing course hot rolled asphalts. Three material parameters were defined using a close-system high-temperature triaxial cell: internal friction, cohesion and mix viscosity. The parameters internal friction and cohesion were combined into a measure of the 'limiting initial resistance' for a material -a measure of the resistance offered by a material prior to movement. Mix viscosity is a measure of the internal resistance to movement of a material, at constant voidage. A rolling rig was constructed to measure, under controlled conditions, the response of a material to the action of a dead-weight roller, using two chipping rates. Two important outcomes of the rolling programme were: (1) the material below the chippings controlled chipping embedment; (2) chipping rate influenced the voidage of material between chippings only during the stage of effective compaction, terminal voidage of a material layer below and between chippings was a function only of the basic strength properties of the material. Relating the triaxial data with the performance of the material under the action of a dead-weight roller, a correlation was found between a ratio of the material parameters, the quotient of mix viscosity and 'limiting initial resistance' (lir), and the terminal voidage of the material measured below the chippings in compacted slabs. For the covering abstract of the conference see IRRD 823743.

• Corporate Authors:

  Hatfield Polytechnic, England

  School of Engineering, College Lane, P.O. Box 109
  Hatfield, Hertfordshire,   England 
• Authors:
  • AL-NAGEIM, H K
  • FORDYCE, D
• Publication Date: 1989

Language

• English

Media Info

• Pagination: 12 p.

Subject/Index Terms

• TRT Terms: Bituminous mixtures; Cohesion; Conferences; Friction; Hot coated materials; Measuring instruments; Pavement wearing course; Rollers; Stiffness; Triaxial shear tests; Viscosity; Void ratios
• Uncontrolled Terms: Internal
• Old TRIS Terms: Void
• Subject Areas: Data and Information Technology; Highways;

Filing Info

• Accession Number: 00498701
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Sep 30 1990 12:00AM