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 […]

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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 […]

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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, […]

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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 […]

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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 […]

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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 […]

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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 […]

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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 […]

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Cross section of the Hetaoyu reinforced soil wall

June 1st, 2012

A number of readers have responded with requests after seeing and reading about the 2011 International Achievement Award of Excellence winner, “Geotextile-reinforced soil retaining wall for Hetaoyu Mine coal processing plant” in the February/March issue of Geosynthetics. Most of the inquiries came from engineers asking for diagrams or cross sections of this distinctive structure built […]

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Well done, lessons learned

June 1st, 2012

To the editor: With the sun shining and birds chirping, I took my April/May issue of Geosynthetics from my mailbox directly to my favorite reading chair. Intrigued by your editorial and the cover image of a massive 90.3-acre earth wound, the article “Closing the A&L Salvage Landfill: An unprecedented design-build regulatory effort” resonated my subconsultant […]

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