A MEASURE OF THE WORKABILITY OF ASPHALTIC MATERIALS

The article describes test procedures which could be used to define the workability of asphalt mix and which could provide a specification for this criteria. Profiles of limiting resistance to movement (lir) and mix viscosity of three mix densities expressed as voids in mix (vim) at 60 deg C, 80 deg C, 100 deg C and 120 deg C, were defined by axially loading a laboratory prepared sample in a closed system triaxial test apparatus with the lir profiles for all the asphaltic mixes studied at 3% void content. A change in the gradient of the profiles in the temperature range 83-90 deg C was identified. Comparing the two sets of profiles, lir and viscous resistance above this temperature range, lir values decrease comparatively more than mix viscosity values. Below this temperature range mix viscosity values increase comparatively more than lir values. A plot of the quotient of the mix viscosity to limiting initial resistance at 3% voids content for any asphaltic mix is curvalinear, concave upwards. The workability index has been defined as the value of the quotient at the turning point of the profile. The temperature corresponding to the value of the workability index is a "transition" temperature for the rates of gain in the component of internal resistance. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3831968
• Corporate Authors:

  D.R. Publications Limited

  Faversham House, 111 St James Road
  Croydon, Surrey CR9 2TH,   England 
• Authors:
  • AL NAGEIM, H
  • FORDYCE, D
• Publication Date: 1988-1

Media Info

• Features: References;
• Pagination: p. 28-30
• Serial:
  • Highways
  • Volume: 56
  • Issue Number: 1933
  • Publisher: Alad Limited
  • ISSN: 0142-6168
  • Serial URL: http://www.highways-mag.co.uk

Subject/Index Terms

• TRT Terms: Air voids; Asphalt mixtures; Hot coated materials; Mix design; Specifications; Test procedures; Triaxial shear tests; Viscosity; Wearing course (Pavements); Workability
• Uncontrolled Terms: Triaxial testing machine
• Old TRIS Terms: Air voids content
• ITRD Terms: 6155: Apparatus (measuring); 4967: Bituminous mixture; 6486: Chart; 4997: Hot coated material; 5541: Intrinsic curve; 4714: Mix design; 5483: Movement; 177: Specifications; 6288: Test method; 5566: Triaxial; 5936: Viscosity; 2980: Wearing course; 5941: Workability
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00480274
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Mar 31 1989 12:00AM