Optimum height for geotextile storage

April 1st, 2010

From the GMA Techline Subject: Optimum height? ASTM D4873 covers the identification, storage, and handling of geotextiles. However, there is no guide on what the optimum height should be for stacking rolls of material. This is often covered by statements to the effect that this should be “specified by the manufacturer.” All well and good, […]

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Questions about GM/GCL composite liners

April 1st, 2010

From the GMA Techline Subject: 3 questions How do I approach designing/specifying GM/GCL composite liners for MSW landfills? Do I simply adopt the GM13 standard, which is based on fundamental research, and then double-check that the leachate leakage rate is within acceptable limits for my specific project? What other material parameters need to be project […]

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Backfill depleted open-pit mines with lined landfills, tailings, and heap leach pads

April 1st, 2010

By Allan J. Breitenbach Abstract Landfills, tailings impoundments, and heap leach pads are the largest and highest geomembrane-lined fill structures in the world. These lined structures require large areas for storage and containment of solid wastes, precious or base metal mill waste tailings, and ore heap fill materials. Today, municipal waste landfills are considering the […]

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Difficult lining task

April 1st, 2010

From the GMA Techline Subject: Lining task Please find attached some recent pictures of an aluminum storage tank in one of our ongoing projects. Initially, we proposed to line the tank with a 2mm-thick HDPE sheet based on its chemical resistance. The tank is already fabricated with carbon steel by our client who failed to […]

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Textured HDPE?

April 1st, 2010

From the GMA Techline Subject: Textured HDPE? We are looking at a stormwater basin about 2-3 acres in size with a 20-30ft side slope at 4:1. We are using 60-ml HDPE smooth and it will be covered with sand. The pond will be partially filled with water most of the time. Will the sand stay […]

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Geocell application

April 1st, 2010

From the GMA Techline Subject: Geocell application I would like to know the suitability of geocell as slope surface protection on acidic soil conditions. Can we apply geocell directly on top of the slope surface? (Azilah, Malaysia) Reply: Geocells are regularly used in exactly the type of application you describe. A geotextile is generally placed […]

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Welding LLDPE/HDPE

April 1st, 2010

From the GMA Techline Subject: Welding LLDPE/HDPE How do you achieve a satisfactory extrusion weld between a 1mm LLDPE geomembrane and a 2mm HDPE geomembrane? What constitutes a satisfactory extrusion weld? (Niall, Ireland) Reply: You have two things going against you in your situation: thickness differences and material differences. Regarding the thickness situation, 1mm is […]

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What do you want from your green roof?

April 1st, 2010

All green roofs include multiple underlayers of materials that, together, protect the building and provide the conditions for the top-layer plantings to thrive. Chief among these layers are geosynthetic materials required for separation, waterproofing, and drainage. This article includes selections from “Green roof design and installation” by Angie Durhman, Green Roof Program Manager at TectaAmerica, […]

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Strong as silk: Using a bio-enabled approach to produce nanoparticle composites

April 1st, 2010

By John Toon Using thin films of silk as templates, researchers have incorporated inorganic nanoparticles that join with the silk to form strong and flexible composite structures that have unusual optical and mechanical properties. This bio-enabled, surface-mediated approach mimics the growth and assembly processes of natural materials, taking advantage of the ability of biomolecules to […]

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Geotextile tubes are integral components for oil-pipe foundations, erosion control

April 1st, 2010

PEMEX marine facilities in Tabasco, Mexico. By Alfonso Solís, Amy Tang, and Zoe Lin Abstract In this project, geotextile tube technology is adopted as part of an integral solution for beach erosion problems at the Dos Bocas marine facilities for Petroleos Mexicanos (PEMEX). The solutions designed consisted of: geotextile tubes (GT) filled with sand working […]

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