There is a need for realistic specifications for clay and gravel road surfacing on low-volume roads. TRB hosted a webinar on Wednesday, December 9, 2020 from 2:00-3:30 PM Eastern that identified specifications for clay content of gravel roads. The presenters described a mix design and test method for determining optimal amounts. They also provides examples of ways low-volume road agencies have obtained better performing gravel roads.

This webinar was organized by the TRB Standing Committee on Low Volume Roads.

The slides and recording of the webinar are available.

Webinar agenda and presenters

1. Requirements of testing: Steve Monlux, LVR Consultants, Inc.
   1. Quantity and quality assurance clauses
   2. Options for reducing crushing costs
   3. Typical mix design curves
2. Results from fifteen years of clay content optimization testing: Oscar Mena, United States Department of Agriculture
3. Question and answer session: Moderated by Brian Moore, Iowa County Engineers Association Service Bureau

The first 60 minutes of the webinar will be for presentations and the final 30 minutes will be reserved for audience questions.

Learning Objectives

At the end of this webinar, participants will be able to:

1. Identify rationales for selecting optimum clay content
2. Describe reasoning behind specification clauses
3. Discuss successful quality and quantity assurance methods

Professional Development Hours

Professional Development Hours (PDHs) earned on completion of this program were reported to the Registered Continuing Education Program (RCEP). Certificates of Completion are issued to all participants via the RCEP.net online system. Complaints about registered providers may be addressed to RCEP, 1015 15th Street, NW, 8th Fl., Washington, DC, 20005.