Unbonded concrete overlays are increasingly popular solutions for pavement rehabilitation. TRB hosted a webinar on Monday, October 5, 2020 from 2:00 to 3:30 PM Eastern that introduced the history, basic components and procedures, and a new procedure for unbonded concrete overlays placed on existing concrete or composite pavements. Presenters presented a new mechanistic-empirical design procedure that can account for the performance of concrete overlays. This webinar material is based on completed FHWA pooled fund study, Development of an Improved Design Procedure for Unbonded Concrete Overlays.
This webinar is sponsored by the TRB Standing Committee on Design and Rehabilitation of Concrete Pavements.
The slides are linked in the meeting materials below. Click here to view the recording.

Webinar agenda and presenters

1. History, basic components, and unique features of unbonded concrete overlays: Gordon Smith, Iowa State University
2. Design, construction, and maintenance of unbonded concrete overlays: Julie Vandenbossche, University of Pittsburgh
3. Overview of improved design procedure for unbonded concrete overlays: Lev Khazanovich, University of Pittsburgh
4. Question and answer session: Moderated by Tom Burnham, Minnesota Department of Transportation

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, you will able to:

1. Describe the history, basic components, construction, and maintenance methods unique to unbonded concrete overlays of existing concrete or composite pavements.
2. Describe the important role of the interlayer system used within unbonded concrete overlays.
3. Introduce an improved procedure for the design of unbonded concrete overlays of existing concrete or composite pavements.