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 WASHINGTON, D.C. — TRB will be conducting a webinar on Sept. 12, 2011, from 2:00 p.m. - 4:00 p.m. EDT that will explore procedures for designing dense-graded, asphalt concrete mixtures that will be produced using currently available warm-mix asphalt (WMA) processes. Participants must register in advance of the webinar and there is a fee for non-TRB Sponsor employees. Professional Development Hour (PDH) certificates will be provided for this webinar; the webinar has a value of 1.5 hours.

To receive a PDH certificate, a person must register and attend the webinar individually. For groups, only the person who registers and attends the session receives a certificate. For questions, please contact Lisa Marflak at lmarflak@nas.edu.

WMA refers to asphalt concrete mixtures that are produced at temperatures approximately 50°F (28°C) or more cooler than typically used in the production of hot-mix asphalt (HMA). WMA can provide similar strength, durability, and performance characteristics as HMA using substantially reduced production temperatures. Producing asphalt at reduced temperatures provides environmental and health benefits, such as lower greenhouse gas emissions, lower fuel consumption, and reduced exposure of workers to asphalt fumes.

The design of WMA requires some changes to current HMA mix design practices. This webinar will explore procedures for designing dense-graded, asphalt concrete mixtures that will be produced using currently available WMA processes. These WMA mix design procedures are based on research conducted in a National Cooperative Highway Research Program (NCHRP) project, Mix Design Practices for Warm Mix Asphalt, which concluded that only minor modification of current mix design practice is needed to address WMA. To implement the modifications for WMA, researchers developed an appendix to the current dense-graded HMA mix design procedure, Standard Practice for Superpave Volumetric Design for Hot-Mix Asphalt (HMA). This appendix, Special Mixture Design Considerations and Methods for Warm Mix Asphalt (WMA) is the subject of this webinar.

Presenters for this session:
• Ramon Bonaquist, Advanced Asphalt Technologies, LLC, will present an overview of the appendix, Special Mixture Design Considerations and Methods for Warm Mix Asphalt (WMA), and will provide background information about its development.
• Brian Prowell, Advanced Materials Services, LLC, will present data from the NCHRP project in which the appendix was used to perform mix designs for several field projects.
• Rick Harvey, Wyoming Department of Transportation, will provide an update of efforts to incorporate the appendix into the AASHTO Standard Methods of Test.

There is no registration fee for employees of TRB sponsors who register using their work e-mail address. In addition to employees of TRB sponsor organizations, the following are eligible to receive complimentary webinar registration:
• TRB and National Academies employees;
• Chairs of TRB Standing Committees, Sections, or Groups;
• CRP panel members who were involved with developing the report or project that is the subject of the webinar;
• Members of the media; and
• Congressional staff members.

Other sites must pay $109 per site. View the TRB pricing page for details.