Use of Tire Derived Products (TDP) in Roadway Construction

Tire Derived Aggregate (TDA) is referred to in this report as rough shreds, shreds, and tire chips of various sizes. The potential uses discussed herein include TDA as lightweight fill, retaining wall backfill, insulation layer, drainage layer, and capillary moisture break. Other uses exist; however, they are beyond the scope of this report. This report summarizes the results of numerous studies regarding the environmental concerns of using TDA both above and below the ground water table. The summary provides general observations based on the literature review performed, comments on the current state of the practice regarding the use of TDA for highway applications, and information on additional resources.