TRB Webinar: Practices for Stabilized and Recycled Base and Subgrade Materials

October 07, 2019 02:00 PM - 04:00 PM U.S. Eastern
Cost (for your seat)
Professional Development Hours for this webinar
2.00 hour(s)
Continuing Education Hours for this webinar
AAE: 0.00 hour(s)
AICP: 0.00 hour(s)
CLE: 0.00 hour(s)

Road construction professionals are invited to a TRB webinar on Monday, October 7, 2019, from 2:00 PM to 4:00 PM ET. The webinar will provide an overview of practices used to achieve high quality subgrade and base material when using lower quality or recycled materials. Laboratory and field data are used to predict performance of bases and subgrades and can be used to evaluate how low-quality and recycled materials can create high-quality bases and subgrades. The webinar will address construction efficiency gains for existing lane reconstruction using Full Depth Reclamation (FDR) and Cold Central Plant Recycling (CCPR), non-destructive testing (NDT) and lab design, relating lab data to field data, and utilizing the Plastic Mold Compaction Device (PM device) to compact and test a range of materials. Presenters will also discuss financial savings and improved performance through reclamation technologies.

This webinar was organized by the TRB Standing Committees on Stabilization of Geomaterials and Recycled Materials and Geotechnical Instrumentation and Modeling.  

Some registrants will need to pay $95 to attend this webinar.  Sign into to view registration information.

Webinar Presenters

  • Brian Diefenderfer, Virginia Department of Transportation
  • Tom Scullion, Texas A&M Transportation Institute
  • Soheil Nazarian, University of Texas at El Paso
  • Isaac Howard, Mississippi State University

Moderated by: Robert Parsons, University of Kansas

Webinar Outline

  1. Construction efficiency gains for existing lane reconstruction using Full Depth Reclamation (FDR) and Cold Central Plant Recycling (CCPR)
  2. Relating non-destructive testing (NDT) testing and lab design work to Falling Weight Deflectometer (FWD) and obtaining in-situ design moduli values
  3. Relating lab data to field data and pavement performance laboratory and field experiences
  4. Utilizing the Plastic Mold Compaction Device (PM device) to compact and test a range of chemically stabilized materials

The first 90 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. Determine financial savings and improved performance through reclamation technologies
  2. Describe how laboratory tests and non-destructive tests can assist with design and help predict pavement performance for FDR sections and other stabilized sections
  3. Describe how the PM device technology can provide fast, efficient, and reliable quality control information on stabilized layers as they are constructed

Professional Development Hour Information

A certificate for 2 Professional Development Hours (PDHs) will be provided to Professional Engineers (PEs) who register and attend the webinar as an individual. For approved webinars, TRB’s webinar program awards Registered Continuing Education Provider (RCEP) Professional Development Hour (PDH) credits associated with participation only to the registered individual and not to other members of a group that view the webinar together. To receive PDH credits, please register as an individual and sign into the webinar from your personal computer. After doing this, you may join your group in a meeting room.  To be eligible for the credits, individuals must remain signed in for the entire webinar, including for any question and answer session following the presentations.

In addition, advance registration is available until just before the webinar starts. Once the webinar starts, you will be unable to submit your registration. Individuals that are registered for a webinar but do not receive their confirmation emails due to their organization’s internal firewalls should contact the TRB Helpdesk ( for assistance in signing in.

Individuals registered as Florida PEs are no longer required to email TRB with your license number to report your attendance. Instead, please use your certificate that TRB provides through as verification of your attendance to the Florida Board of Professional Engineers.

Please check with your licensing board to ensure that TRB webinar PDHs are approved by your board.

This webinar was developed in March 2019. TRB has met the standards and requirements of the Registered Continuing Education Program (RCEP). Credit earned on completion of this program will be reported to RCEP by TRB. Complaints about registered providers may be sent to RCEP, 1015 15th Street, NW, 8th Floor, Washington, DC 20005. Website:

Registration questions? Contact Reggie Gillum at