Chemical recycling of Polyethene terephthalate as a sustainable binder in soil stabilization
Alok Chandra, Sumi Siddiqua
Dans les comptes rendus d’articles de la conférence: GeoCalgary 2022: 75th Canadian Geotechnical ConferenceSession: T5
ABSTRACT: As a form of white pollution, polyethene terephthalate (PET) waste imposes a significant burden on the environment and stabilizing weak soils can be considered one of the geotechnical solutions to recycle this waste. Bis(hydroxyethyl) terephthalate (BHET) is the main product produced by the glycolysis of PET waste. In this study, BHET polymer was dissolved in sodium hydroxide (NaOH) solutions to produce three different concentrations of BHET (5, 10, 20 g/L) to produce disodium terephthalate salt (Na2TP) and ethylene glycol (EG). The prepared solutions were mixed with Sand Bentonite Mixture (SBM) to enhance their physical and mechanical characteristics for landfill application. The maximum dry density values of the compacted SBM are increased whereas, optimum moisture content values are decreased with BHET-NaOH solution treatment. The values of unconfined compressive strength and elastic stiffness increased due to denser soil arrangement and enhancement in stress transfer due to Na2TP crystals at particle contact points. The Scanning electron microscopy revealed Na2TP crystals precipitated and coated on Sand as well as clay surfaces. The weight percentage obtained from Energy-dispersive X-ray spectroscopy supports the close resemblance of Na2TP crystals and Na-bentonite. The findings of this paper are extremely important and serve as a foundation for the applications of PET waste in large-scale geotechnical projects.
Please include this code when submitting a data update: GEO2022_154
Retrouver cet article:
Les membres de la Société canadienne de géotechnique peuvent accéder à cet article, ainsi qu'à tous les autres articles de la Conférence Géotechnique Canadienne, dans le Espace membre. Les comptes rendus d'articles sont également disponibles dans de nombreuses bibliothèques.
Citer cet article:
Chandra, Alok, Siddiqua, Sumi (2022) Chemical recycling of Polyethene terephthalate as a sustainable binder in soil stabilization in GEO2022. Ottawa, Ontario: Canadian Geotechnical Society.
@article{Chandra_GEO2022_154,
author = Alok Chandra, Sumi Siddiqua,
title = Chemical recycling of Polyethene terephthalate as a sustainable binder in soil stabilization,
year = 2022
}
title = Chemical recycling of Polyethene terephthalate as a sustainable binder in soil stabilization,
year = 2022
}