One-dimensional (1D) immediate compression and creep in large particle sized Tire Derived Aggregate (TDA) for leachate collection and removal systems (LCRS)

Abstract

Potential cost savings and environmental benefits are two reasons for using Tire Derived Aggregate (TDA) in place of gravel, or drainage geosynthetics, as drainage material in leachate collection and removal systems (LCRS) of waste disposal sites. As a polymeric material, TDA is expected to undergo both immediate and time dependent compression (creep) under sustained compressive loading, and these may influence performance. The response of large particle sized TDA – TDA with individual particle sizes generally greater than 50 mm – to large compressive loads up to 300 kPa was studied to assess void volume reduction from the individual and combined effects of immediate compression and creep. The results showed void volume reduction from creep, but this was considerably less than that from the immediate compression. Isotropic solid volume compression in individual TDA particles was found to be negligible. The final void ratio appeared to be dependent on the initial void ratio, as well as on the applied load, but did not appear to be dependent on the loading rate or to be influenced by elevated temperatures (up to 58 C). Presented here are the details of the study, findings and implications for practice.