June 1, 2020
I’m writing this from my living room, my office for now during mandatory telecommuting for all Industrial Fabrics Association International staff due to the COVID-19 pandemic. It’s been an experiment, thus far successful, in putting together a magazine without face-to-face meetings and with no hard copies of proofs to review. Despite the behind-the-scenes logistical drama, …
Make your plans now to participate in Geosynthetics Conference 2021—Colocated with IECA’s Annual Conference Who? Who is on the Organizing Committee for this event? Organizing Committee Chair Jie Han, Ph.D., The University of Kansas Technical Program Co-chairs Melissa Beauregard, Ph.D., P.E., United States Air Force Academy Jennifer E. Nicks, Ph.D., P.E., Federal Highway Administration Application …
By René B. Laprade and John M. Lostumbo Moisture within pavement layers is a principal cause of pavement deterioration (Cedergren 1994, Christopher and McGuffey 1997, Henry and Holtz 2001). Specific problems associated with moisture include (1) reduction in pavement strength caused by excess water in the base course layers and/or the subgrade soils, (2) shrinking …
By James L. Hanson and Nazlı Yeşiller Composite liner systems consisting of geomembranes (GMs) placed over geosynthetic clay liners (GCLs) commonly are used for containment applications. Such systems are used in base liners for ponds, reservoirs, basins and canals, and bottom and cover liner systems for landfill facilities. Even though the use of GCL-GM composites …
The North American Chapter of the International Geosynthetics Society (IGS-NA) held a technical and social session at the Geosynthetics Conference 2020: CASE STUDIES in North Charleston, S.C. The chapter would like to express our sincere gratitude to our volunteers that made this session happen: Boyd Ramsey of Boyd Ramsey Consulting, Professor Michael Pluimer of the …
Moderated by George R. Koerner Minimum sediment thickness Q: We are going to construct some evaporation ponds on existing sediment on top of a Hypalon geomembrane. The sediment looks to be predominantly fine. The subgrade condition below the liner is not known for sure. In such conditions, can you recommend a minimum sediment thickness that …
During the Geosynthetics CASE STUDIES Conference in March in North Charleston, S.C., a few of the past Geosynthetic Materials Association (GMA) leaders had an opportunity to address the gathering and recall their personal experiences and achievements when they chaired the GMA executive council. This is the second installment of the history of GMA. Beginning in …
George R. Koerner This article describes a large-scale test method intended to determine the leakage through imperfections in a geomembrane (GM) under a given head. It can be used as a performance test to simulate field conditions where the GM is physically breached. The test method places a GM test specimen of 2 feet (0.6 …
Compressor station gravel pad on soft subgrade By Sanat Pokharel, Timothy Yii, Marc Breault and Meisam Norouzi Infrastructure development in natural resources rich Alberta, Canada, often encounters very soft ground conditions that pose several construction and sustainability challenges to transportation infrastructure, such as roads, rails and pipelines. As the conventional construction practices may not always …
