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MSW landfill cap anchor trench design
June 1st, 2012
From the GMA Techline RE: MSW landfill cap anchor trench design I have been asked by a project manager with my company to design an anchor trench for a municipal solid-waste (MSW) landfill that is being capped using a 40-mil LLDPE (linear low-density polyethylene) geomembrane. Having read through Designing with Geomembranes 5th edition, I was […]
GCL and HDPE questions
June 1st, 2012
From the GMA Techline RE: Two questions Does a geosynthetic clay liner (GCL) form whales from gas or water pressure, the same way as with a flexible membrane liner (FML), or does gas or water under pressure pass upward through a GCL? When a high-density polyethylene (HDPE) pipe crushes—say, due to lack of bedding when […]
Question about AOS
June 1st, 2012
From the GMA Techline RE: Question about AOS Can you help telling me how to calculate the apparent opening size (AOS) of a nonwoven geotextile if I have permittivity, permeability, flow rate, and thickness? Is it possible to do? (Jorge | Mexico) Reply: What a great question but, unfortunately, the answer is “No.” The reason […]
High-temp resilient liner
June 1st, 2012
From the GMA Techline RE: High-temp resilient liner Can you please guide me to suppliers of high-temp, approx. 215 F (100 C) liners? Also, the liner should be able to handle up to 200,000ppm TDS (total dissolved solids) of salts. I am looking for HDPE or similar liner. (Mukesh | Australia) Reply: Wow, what a […]
Polypropylene vs. polyester
June 1st, 2012
From the GMA Techline RE: Polypropylene vs. polyester? I was hoping you may be able to provide some guidance regarding the material use of geotextile cushion within landfills. The manufacturer has suggested that their geotextiles are polyester, however we typically nominate a nonwoven, needlepunched, polypropylene geotextile. (Alaa | Australia) Reply: From the very beginning of geotextiles, […]
Peak friction values for textured HDPE
June 1st, 2012
From the GMA Techline RE: Peak friction values for textured HDPE? I am currently in the design phase of a landfill cover system that I would like to design with rather long 3:1 slopes consisting of an HDPE liner and geocomposite drainage net atop the waste and under three feet of cover soil. I am […]
MSE wall connection
June 1st, 2012
From the GMA Techline RE: MSE wall connection? When an MSE (mechanically-stabilized earth) wall is constructed using geosynthetic reinforcement, how is it connected to precast concrete facing? Are metal tabs cast in the concrete or can a geosynthetic product be cast in the precast panel? If this connection is always metal, does the backfill need […]
The roles of geomembranes in algae production at landfills
June 1st, 2012
The articles in this series encompass all types of geosynthetics and their applications viewed from the context of sustainability. Traditional solutions are compared with geosynthetic solutions from both cost and carbon footprint perspectives. (from the Geosynthetic Research Institute’s 24th conference, 2011) Abstract Waste streams from municipal solid waste landfills may potentially be used as feedstocks […]
Green roofs with geosynthetic materials optimize sustainability
June 1st, 2012
Texas Case Study Introduction Green or vegetated roofs have proven an effective method of reducing the energy load requirements of buildings. Another way green roofs contribute to sustainability is by reducing carbon levels in the atmosphere through carbon sequestration or the removal and storage of carbon. Successful green roofs frequently use a variety of geosynthetic […]
Geomembrane curtain improves salmon habitat
June 1st, 2012
At the Whiskeytown Reservoir By Bob Gee, Greg Morris, and Stanford W. Slifer Introduction In California’s Central Valley, geomembrane temperature curtains provide an example of how geosynthetic materials can help stabilize environmental conditions along water diversion systems. Located in the Whiskeytown Reservoir, about 10 miles west of Redding in Northern California’s Shasta County, one of […]