dc.contributor.author	Mneina, Amin
dc.contributor.examiningcommittee	Ghazi, Ahmed (Civil Engineering) Alauddin, Ahammed (Civil Engineering) Hollander, Hartmut (Civil Engineering)	en_US
dc.contributor.supervisor	Shalaby, Ahmed (Civil Engineering)	en_US
dc.date.accessioned	2019-11-14T21:27:38Z
dc.date.available	2019-11-14T21:27:38Z
dc.date.issued	2019	en_US
dc.date.submitted	2019-09-29T22:57:51Z	en
dc.degree.discipline	Civil Engineering	en_US
dc.degree.level	Master of Science (M.Sc.)	en_US
dc.description.abstract	The drainage performance of unbound granular material (UGM) is an important consideration in pavement design because the presence of excess moisture in UGM layers can eventually lead to premature failures. Recently, transportation agencies have been evaluating their granular base and subbase drainage and mechanical performance to ensure sufficient drainage capacity while maintaining adequate structural support to produce more sustainable pavement structures. Linking performance to UGM construction specification requires accurate characterization of UGM’s mechanical and drainage performance and how physical and gradation parameters affect such performance. These evaluations led to an update of the specification requirements of UGM in many jurisdictions including Manitoba. In this research, constant head hydraulic conductivity, resilient modulus, permanent deformation, double ring infiltrometer, and falling weight deflectometer test methods were used in laboratory and field investigations. These tests were conducted to characterize the drainage and mechanical performance of ten UGM samples representing four different gradation bands. The laboratory test results were also used to investigate the reliability of the estimated hydraulic conductivity from the Moulton prediction model and from the Enhanced Integrated Climatic Model (EICM). Test results showed an improvement in resilient modulus and drainage quality for samples in gradation bands that specify larger maximum aggregate size and limited fines. A statistical analysis of the test results showed that D10 larger than 0.2mm and D60 larger than 8mm would guarantee higher stiffness and better drainage performance with a time-to drain of less than 5days for typical pavement cross-sections and a resilient modulus value exceeding 200MPa. The Moulton prediction model was found to provide a better approximation of hydraulic conductivity of the materials included in this study, while the EICM model was found to significantly overestimate the hydraulic conductivity for most of the samples.	en_US
dc.description.note	February 2020	en_US
dc.identifier.uri	http://hdl.handle.net/1993/34369
dc.language.iso	eng	en_US
dc.rights	open access	en_US
dc.subject	UGM	en_US
dc.title	Mechanical and drainage performance characterization of unbound granular materials	en_US
dc.type	master thesis	en_US
local.subject.manitoba	yes	en_US

Mechanical and drainage performance characterization of unbound granular materials

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