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PG XX (AASHTO T315) en

Regulatory Documents

  1. AASHTO T315 Determining the Rheological Properties of Asfhalt Binder Using a Dynamic Shear Rheometer (DSR)
  2. ASTM D7175 Standard Test Method for Determining the Rheological Properties of Asphalt Binder Using a Dynamic Shear Rheometer
  3. EN 14770 Bitumen and bituminous binders – Determination of complex shear modulus and phase angle – Dynamic Shear Rheometer (DSR)
  4. DSTU EN 14770:2019 Bitumen and Bituminous Binders. Determination of Complex Shear Modulus and Phase Angle using a Dynamic Shear Rheometer

These standards define the test procedure for bituminous binders using a Dynamic Shear Rheometer (DSR) to evaluate rheological properties. This method allows for the measurement of the complex shear modulus (|G*|) and the phase angle (δ) for original (unaged) bitumen, as well as after short-term (RTFOT) and long-term (PAV) aging.

Key Outcome:

  • Complex Modulus G* [kPa]: Characterizes the stiffness and total resistance to deformation.
  • Phase Angle δ [°]: Characterizes visco-elastic behavior; a smaller angle indicates higher elasticity.
  • Rutting Factor (G*/sin δ): Evaluated for unaged (≥ 1.0 kPa) and RTFOT binders (≥ 2.2 kPa).
  • Fatigue Factor (G* · sin δ): Evaluated after PAV aging (≤ 5000 kPa).

Test Conditions

Temperature Range:

  • for determining the rutting resistance parameterG*/sin⁡δ – від 34 до 106 °C;
  • for determining the fatigue cracking resistance parameter G*∗sin⁡δ – from minus 5 до 40 °C.

Testing at a fixed temperature is possible.

Frequency: Standardly 10 rad/s (1.59 Hz).

Plate Diameter:

  • for determining the rutting resistance parameter G*/sin⁡δ – 25 мм;
  • for determining the fatigue cracking resistance parameter G*∗sin⁡δ – 8 мм.

Gap Between Plates:

  • for determining the rutting resistance parameter G*/sin⁡δ – 1 мм;
  • for determining the fatigue cracking resistance parameter G*∗sin⁡δ – 2 мм

Examples of Results

On the left is the test of unaged bitumen Orlen 70/100, which, according to the results obtained, corresponds to PG 64 under the Superpave system. On the right is Orlen 70/100 modified with a polymer (SBS), which corresponds to PG 70.