Relationships between binder and asphalt properties for the ALF deformation trial binders

Data from the Accelerated Loading Facility (ALF) asphalt deformation trial in Queensland, and the associated laboratory study, were used to develop relationships between binder properties and: (a) field deformation under ALF, and (b) the properties of asphalt specimens from the ALF site. Only data from the ALF follow up trial, where the pavement temperature was controlled at 50 degrees Celsius, were found to be suitable for analysis. The Strategic Highway Research Program (SHRP) parameter for rut resistance (G*/sin delta) at 50 degrees Celsius or 60 degrees Celsius and the appropriate rate of loading did not give a good indication of relative deformation resistance of asphalts containing polymer modified binders. The same was true of the loss modulus (G*.sin delta). Tan delta (energy absorbed/cycle or pulse)/(energy stored elastically) was a good indicator of wheel tracking performance. Of the routine binder test procedures, softening point and consistency (at the asphalt test temperature) correlated with asphalt wheel tracking and ALF deformation performance. Penetration at 25 degrees Celsius correlated with asphalt resilient modulus at the same temperature. The best relationships were obtained when binder testing was carried out at a temperature close to that at which the asphalt was loaded. A high elasticity SBS binder generally did not conform with the above relationships. Its high elasticity or network formation may contribute to resistance to flow during binder testing but not during wheel tracking or rutting of asphalt. Usually, improved correlations were obtained when RTFO treated binders were used rather than untreated binders. It is recommended that suitable sample preparation and testing protocols should be established for PMBs to ensure that any structure present in the road situation is not destroyed during laboratory testing. The analysis was based on a small data set and more work, involving a wider range of binders, will be necessary to confirm and extend the findings.


  • English

Media Info

  • Pagination: 7.1-24
  • Serial:
    • Issue Number: 12

Subject/Index Terms

Filing Info

  • Accession Number: 01435611
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 086910683X
  • Files: ATRI
  • Created Date: Aug 24 2012 7:07PM