Pavement

Cover of Stress Ratio of Bituminous Binders using the Dynamic Shear Rheometer
Stress Ratio of Bituminous Binders using the Dynamic Shear Rheometer
  • Publication no: AGPT-T125-18
  • Published: 5 July 2018

This test method sets out the procedures for the measurement of the stress ratio of binder samples under specific conditions using the dynamic shear rheometer (DSR).

A major failure mode of sprayed seals and asphalt pavements is fatigue cracking of the binder, particularly at low road temperatures. Bituminous binders that are more crack-resistant are therefore an important contributor to performing pavements.

This test method has been developed as Austroads research indicated that the stress ratio property of binders is able to rank the low temperature fatigue cracking performance of bitumen and polymer modified binders in asphalt mixes, and thin binder films of similar thicknesses to sprayed seals.

    • 1.         Preface
    • 2.         Scope
    • 3.         Further Development
    • 4.         Safety Disclaimer
    • 5.         References
    • 6.         Equipment
    • 7.         Calibration and Verification of DSR
    • 8.         Preparation of the DSR and Binder Sample for Testing
      • 8.1        Mounting the Binder Sample on the DSR Test Plates
        • 8.1.1     Direct Transfer Method
        • 8.1.2     Silicone Mould Method (Optional)
      • 8.2        Trimming of the Binder Specimen on the DSR Test Plates
    • 9.         Test Procedure
    • 10.        Stress Ratio Calculation
    • 11.        Reporting
    • 12.        Precision