Show simple item record

dc.contributor.authorEwais, Amr
dc.contributor.otherQueen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.))en
dc.date2014-02-28 04:59:20.834en
dc.date.accessioned2014-02-28T14:19:49Z
dc.date.available2014-05-25T08:00:11Z
dc.date.issued2014-02-28
dc.identifier.urihttp://hdl.handle.net/1974/8640
dc.descriptionThesis (Ph.D, Civil Engineering) -- Queen's University, 2014-02-28 04:59:20.834en
dc.description.abstractWith sufficient time, a high density polyethylene geomembrane will degrade and lose its engineering properties until ruptures signal the end of its service-life. This thesis examines the longevity of nine different geomembranes; five of them were of different thickness manufactured from the same resin. The degradation of properties and time to failure are investigated for geomembranes: in immersion tests; as a part of a landfill composite liner; and, exposed to the elements. The different thermal and stress histories associated with manufacturing geomembranes of different thickness are shown to affect their morphological structure; consequently, their stress crack resistance. When immersed in synthetic leachate, it was found that: (a) thicker geomembranes have a longer antioxidants depletion time but the effect of thickness decreases with temperature and is less than expected; (b) inferences of geomembrane’s longevity based on its initial properties may be misleading because a geomembrane may chemically degrade (as manifested by the change in melt index) despite the presence of a significant amount of stabilizers (as manifested by the measured high pressure oxidative induction time); and, (c) stress crack resistance may change before antioxidant depletion or chemical degradation takes place, likely, due to changes in geomembrane morphological structure with the maximum decrease being observed at 55oC. Reductions also were measured for geomembrane immersed in air and water at 55oC. The geomembrane aged in a simulated landfill liner at 85oC is shown to have service-life as little as three years with 30,000 to >2.0 million ruptures/hectare at failure. For exposed geomembranes in Alumbrera (Argentina), samples were exhumed from two mine facilities after ~16 years of exposure. The antioxidants in exposed samples depleted to residual and the stress crack resistance had dropped to as low as 70 hours. Samples were exhumed from a different exposed geomembrane in a test site in Godfrey (Canada) after six years of exposure. The antioxidants were partially depleted, with depletion to residual projected to take at least 20 years; however, despite no evidence of chemical ageing, the stress crack resistance had decreased from 330 to 190 hours, likely due to changes in the morphological structure of the geomembrane.en_US
dc.languageenen
dc.language.isoenen_US
dc.relation.ispartofseriesCanadian thesesen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectexposed geomembraneen_US
dc.subjectstress crack resistanceen_US
dc.subjectageingen_US
dc.subjectgeosyntheticsen_US
dc.subjectlandfillen_US
dc.subjectlineren_US
dc.subjectoxidative induction timeen_US
dc.subjectdegradationen_US
dc.titleLongevity of HDPE Geomembranes in Geoenvironmental Applicationsen_US
dc.typethesisen_US
dc.description.restricted-thesisTo avoid plagiarism until the chapters of the thesis published as journals.en
dc.description.degreePh.Den
dc.contributor.supervisorRowe, Kerryen
dc.contributor.departmentCivil Engineeringen
dc.embargo.terms1825en


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record