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dc.contributor.authorGarcia, Jelicaen
dc.description.abstractGeosynthetic clay liner (GCL) performance is said to rely on adequate hydration from the subgrade which is controlled by factors such as the properties of the GCL, subgrade and permeant, and their exposure to solar radiation. Much research has been conducted on this topic, however, this thesis examines several significant knowledge gaps and, in particular, the performance of partially hydrated GCLs when permeated with synthetic municipal solid waste leachate. In addition, the components affecting moisture retention or loss of GCLs when subjected to simulated thermal cycles are examined for GCLs that were deconstructed by cutting of the needle-punched fibres to allow each component to be studied in isolation. The findings from column hydration tests performed on GCLs placed on a silty sand subgrade of varying density, compaction conditioning time, and grain size distribution due to silt aggregation are reported. For the isothermal tests, the columns were stored at 25±4°C for four weeks. For cyclic tests, the column airspace was subjected to thermal cycles up to 60°C for the fifth week. Results suggest that silt aggregation can inhibit moisture uptake if not sufficiently broken down by compaction and a GCL that appeared to retain moisture on a typical subgrade lost moisture when placed on a subgrade characterized by high silt aggregation, low density, and long conditioning times. A GCL with fine-grained bentonite that initially lost moisture under thermal cycles also began to retain moisture when the bentonite was ground to a powdered form. The swell index and cation exchange capacity of the bentonite and the hydraulic conductivity of various GCLs (in terms of bentonite granularity, geotextile type, and construction) were obtained after prehydration at 5% and 16% subgrade water contents. The lowest hydraulic conductivity was for a thermally treated GCL with powdered bentonite (4.5 x 10-11 to 8.4 x 10-12 m/s) and the highest was for a non-thermally treated GCL with coarse-grained bentonite (6.0 x 10-08 to 5.1 x 10-10 m/s). The significance of subgrade water content to GCL performance was mostly due to cation exchange and varied with the type of GCL and permeant.en
dc.relation.ispartofseriesCanadian thesesen
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 United Statesen
dc.rightsQueen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canadaen
dc.rightsProQuest PhD and Master's Theses International Dissemination Agreementen
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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.subjectGeosynthetic clay lineren
dc.subjectThermal cyclesen
dc.subjectsilty sanden
dc.titleMoisture Uptake and Loss of Geosynthetic Clay Liners from a Silty Sand Subgrade Under Isothermal Hydration and Thermal Cyclesen
dc.contributor.supervisorRowe, Kerryen
dc.contributor.supervisorBrachman, Richarden
dc.contributor.departmentCivil Engineeringen
dc.embargo.termsMain chapters are yet to be published in a journal paperen
dc.embargo.liftdate2023-09-30T19:40:33Z's University at Kingstonen

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Attribution-NonCommercial-NoDerivs 3.0 United States
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 United States