1. One-dimensional (1D) immediate compression and creep in large particle-sized tire-derived aggregate (TDA) for leachate collection and removal systems (LCRSs)
- Author
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Adesokan, Doyin, Fleming, Ian, and Hammerlindl, Adam
- Subjects
Geosynthetics -- Usage ,Refuse and refuse disposal -- Methods ,Sanitary landfills -- Usage ,Drainage -- Methods ,Earth sciences - 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 the leachate collection and removal systems (LCRSs) of waste disposal facilities. 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. The final void ratio appeared to be dependent on the initial void ratio ([e.sub.0]), as well as on the applied load, but it did not appear to be dependent on the loading rate or to be influenced by elevated temperatures (up to 58[degrees]C). Presented here are the details of the study, findings, and implications for practice. Key words: compression, creep, landfills, leachate collection and removal systems (LCRSs), scrap tires, tire-derived aggregate (TDA). Le fait de remplacer le gravier, ou les geosynthetiques de drainage, par des agregats derives de pneus (TDA) comme materiau de drainage dans les systemes de collecte et d'evacuation du lixiviat (LCRS) des installations d'elimination des dechets permet de realiser des economies et d'obtenir des avantages environnementaux. En tant que materiau polymere, le TDA est cense subir une compression a la fois immediate et dependant du temps (fluage) sous une charge de compression soutenue, et ces facteurs peuvent influencer les performances. La reponse des TDA de grande taille--les TDA dont la taille des particules individuelles est generalement superieure a 50 mm--a de fortes charges de compression allant jusqu'a 300 kPa a ete etudiee pour evaluer la reduction du volume des vides due aux effets individuels et combines de la compression immediate et du fluage. Les resultats ont montre une reduction du volume des vides due au fluage, mais celle-ci etait considerablement inferieure a celle due a la compression immediate. Le taux des vides final semblait dependre du taux des vides initial ([e.sub.0]), de meme que de la charge appliquee, mais il ne semblait pas dependre du taux de charge, ni etre influence par des temperatures elevees (jusqu'a 58[degrees]C). Voici les details de l'etude, ses conclusions et ses implications pour la pratique. [Traduit par la Redaction] Mots-cles : compression, fluage, sites d'enfouissement, systemes de collecte et d'evacuation du lixiviat (LCRS), pneus usages, agregats derives de pneus (TDA)., Introduction Modern-day engineered landfills typically have leachate collection and removal systems (LCRSs) that act to control leachate mounding, and consequently reduce the build-up of excessive hydraulic head on landfill basal [...]
- Published
- 2021
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