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Using the MSCR Test in Asphalt Binder Specifications

Asphalt AcademyWebinars

Description:

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.

Fees & Registration:

To register and pay for the entire series please contact our offices by phone (859.288.4960) or by email (ai_webinars@asphaltinstitute.org).

Professional Development Hours:

  • 2 hrs., 2 PDHs

A PDH Certificate is available upon request after you complete the session by sending an email to ai_webinars@asphaltinstitute.org with the name of the webinar and full name you used to register.

Instructor(s):

  • 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.

Notes:

  • Registration is per individual. Only the registered person will receive emails about the webinar and will be recognized for a PDH certificate. See below for group registration.
  • We would encourage you to visit http://support.webex.com/support/system-requirements.html to ensure your system is compatible with our webinar system before you register or as soon as possible afterward.
  • We also highly recommend that you go to: http://www.webex.com/lp/jointest/ and join a test meeting to load the client and test your system.

Group Registration & PDH Certificate Policy

For more information contact: