On 19 March 2014, a new series of webinars from the North American Geosynthetics Society (NAGS) will debut. Tentatively scheduled to be quarterly installments, NAGS and the Geosynthetics Division of the Canadian Geotechnical Society (CGS) have tapped internationally-renowned geosynthetics expert Prof. R. Kerry Rowe to launch the series. His topic: “Recent insights on the performance of GCLs in bottom liners and covers.”
Professional development credit will be available for each participant paying a registration fee.
DATE: Wednesday 19 March 2014
TIME: 1:00 – 2:00 pm (EDT)
COST: $100 NAGS, CGS or IGS members1
$25 NAGS Student Member Rate1
About the GCL Webinar
The available evidence suggests that both geosynthetic clay liners (GCLs) and composite liners with a geomembrane (GMB) over a clay liner have performed extremely well at controlling leakage in field applications for a couple of decades. However there have also been some problems reported and recent research has allowed us to have a much better understanding of the key design and construction factors affecting good and poor performance. This lecture examines some of these issues affecting GCL performance such as the water retention curve of GCLs, subgrade grain size and initial water content, GCL water content and normal stress on the GCL, the effect of daily thermal cycles on hydration, GCL panel shrinkage, and cation exchange. Factors affecting composite liner performance examined include the potential for desiccation of the clay liner under a sustained thermal gradient, GMB/GCL interface transmissivity, wrinkles in the GMB when the ballast layer is placed over the composite liner, and the potential interaction between wrinkles and GCL panel overlaps. Recent insights regarding leakage through composite liners are discussed. Although a number of potential issues with liner performance are discussed, it is concluded that all can be addressed by appropriate design, material selection, construction, and operation.
About the Presenter: R. Kerry Rowe
Professor Rowe holds the Canada Research Chair in Geotechnical and Geoenvironmental Engineering at Queen’s University. He is an author of 300 journal papers, 3 books, 18 book chapters, and 290 full conference papers. He has presented many prestigious lectures including the Giroud Lecture (2002), Rankine Lecture (2005), and Casagrande Lecture (2011). He is a fellow of the Royal Society of Canada, the Canadian Academy of Engineering, the Royal Academy of Engineering and The Royal Society. He is past president of the International Geosynthetics Society, Canadian Geotechnical Society, and Engineering Institute of Canada.
PDHs: Professional development credit will be available for each participant paying a registration fee.
Groups – Small groups of up to five people are welcome to participate for one registration fee. Groups larger than five would be required to pay a second registration fee.
JOIN NAGS at www.igs-na.org
1Costs are in USD. To descrease your cost, you may join NAGS for $75 USD and then pay the member rate for the webinar. Students may apply to NAGS at no charge for memebership! See www.igs-na.org for membership details.0