Ruggedness Testing of the Dynamic Shear Rheometer and the Bending Beam Rheometer Test Procedures
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Ruggedness Testing of the Dynamic Shear Rheometer and the Bending Beam Rheometer Test Procedures

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English
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  • Creators:
    Shashidhar, N.
  • Corporate Creators:
    United States. Federal Highway Administration. Office of Engineering and Highway Operations R&D
  • Contributors:
    Chollar, Brian H.
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA-RD-95-079
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    United States
  • Corporate Publisher:
    United States. Department of Transportation. Federal Highway Administration
  • Abstract:
    Ruggedness testing of the bending beam rheometer (BBR) and the dynamic shear rheometer (DSR) was performed. Four laboratories participated in this effort. Three materials were used for BBR ruggedness testing and four materials were used for DSR ruggedness testing. Measurement of the creep stiffness and m-value at 60 s with the BBR was found to be fairly repeatable. Of the factors studied, the mold used for casting the beams had a significant effect. Different beam thickness by the two molding techniques was found to be a factor that caused this variation. Other unknown factor(s) also seemed to contribute to this effect. The test temperature also had a significant effect and should be controlled to +/-0.1 deg C. Measurement of the complex shear modulus (G*) and the phase angle (delta) with the DSR was very repeatable. The measurement of G* with 8-mm parallel plates had more variation than the measurement of G* with 25-mm parallel plates. The measurement of delta with both 8-mm and 25-mm plates had lesser variation than the G* measurement. Test temperature was the primary factor that affected the test results for both 8-mm and 25-mm parallel plates, requiring +/-0.1 deg C control. For G* measurements with 8-mm parallel plates, it seemed to make a difference whether asphalt was directly applied to the plates or if it was transferred in the form of a pellet. This effect can probably be accounted for by different thermal history imparted to the pellet. Inconclusive, but definite, effects were observed due to overhang in the case of the 8-mm parallel plates.
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