This webinar is presented to provide the participant with an overview of the multiple-stress creep-recovery (MSCR) test and its use in asphalt binder specifications. The MSCR test uses the concepts of creep and recovery testing to evaluate an asphalt binder’s potential for permanent deformation. One of the concerns that has persisted among users of the PG Asphalt Binder Specification (AASHTO M320 and ASTM D6373) since its introduction in the mid-1990s is that it may not adequately characterize the performance properties of all modified asphalt binders since testing using the Dynamic Shear Rheometer (DSR) occurs in the small strain, linear viscoelastic region. In that region, the stiffness properties of the base asphalt and modification will dominate the response. In the region of higher strains, where damage is expected to occur, the modification plays a much more significant role. Studies have shown that the MSCR test generates results for modified asphalt binders that better relate the contribution of the asphalt binder to the permanent deformation of the asphalt mixture than the G*/sin δ parameter generated from the DSR.
Although the MSCR test and specification have been available as AASHTO and ASTM standards for ten years, implementation has been slowed by a number of questions and concerns. This presentation will address some of the following:
- Background and development of the MSCR test (AASHTO T350 and ASTM D7405)
- Introduction to asphalt binder specifications using the MSCR (AASHTO M332)
- MSCR Recovery and its use as a “Plus” test for identification of elastomeric modifiers
- Appropriate test temperatures for conducting the MSCR test
- Use of the MSCR stress sensitivity parameter (Jnr,diff)
- Use of the MSCR test with RAP and/or RAS
- Variability of the MSCR test
The webinar is presented based upon work supported by the Asphalt Institute and the U.S. Department of Transportation under Cooperative Agreements DTFH61-08-H-00030 and DTFH61-11-H-00033. Opinions, findings, and conclusions or recommendations expressed in this publication are those of the Authors and do not necessarily reflect the view of the U.S. Department of Transportation.
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Professional Development Hours:
- 2 hrs., 2 PDHs
A PDH Certificate is available upon request after you complete the session by sending an email to firstname.lastname@example.org with the name of the webinar and full name you used to register.
- R. Michael Anderson, P.E., Director of Research and Laboratory Services, Asphalt Institute
Who Should Attend:
The webinar is intended for participants who want an overview of the multiple-stress creep-recovery (MSCR) test and it’s use in asphalt binder specifications.
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