Regulatory Documents
- AASHTO T350 Standard Method of Test for Multiple Stress Creep Recovery (MSCR) Test of Asphalt Binder Using a Dynamic Shear Rheometer (DSR)
- ASTM D7405 Standard Test Method for Multiple Stress Creep and Recovery (MSCR) of Asphalt Binder Using a Dynamic Shear Rheometer
- EN 16659 Bitumen and Bituminous Binders – Multiple Stress Creep and Recovery Test (MSCRT)
- DSTU EN 16659:2023 Bitumen and bituminous binders. Determination of MSCRT (Multiple Stress Creep and Recovery Test)
Purpose
The standards define the methodology for testing asphalt binder using a Dynamic Shear Rheometer (DSR) to evaluate its rheological properties. It allows for the measurement of the complex shear modulus ($|G^*|$) and phase angle ($\delta$) for original bitumen, as well as after short-term (RTFOT) and long-term (PAV) aging. The test results are used to assess the bitumen’s ability to resist deformations, such as rutting, and to select the appropriate binder material for road construction.
Test Conditions
Example Results
Below are the test results for unaged Orlen 70/100 bitumen, which, according to the results, corresponds to PG 64 under the Superpave system. On the right is Orlen 70/100 modified with polymer (SBS), which corresponds to PG 70.