More importantly, tire shreds are often the cheapest source of lightweight fill. Tire shreds have been used as fill on nearly 100 state and local highway projects. Several projects have used in excess of 500,000 tires each. The basic engineering properties of tire shreds have been determined in a number of studies. Moreover, the behavior of tire shred fills has been monitored in several full scale projects.
Guidelines are available to minimize internal heating of thick tire shred fills.
Embankments built in accordance with the guidelines have not experienced detrimental heating. Wider acceptance of use of tire shreds as lightweight fill is limited by lack of a concise source of data on engineering properties and design considerations. This cursory treatment of tire shreds was published in 1994 and is so outdated that it is of little use to a designer who wants to use tire shreds in a highway project. Moreover, the synthesis did not identify areas where additional study was needed. In the proposed Synthesis of Information, the tasks given in the following would be accomplished.