Wakeboarding lakes get synthetic turf revetments

October 1st, 2014

Erosion control, turbid water addressed with new shoreline protection By Paul O’Malley Introduction The newly opened Terminus Wake Park is located within the LakePoint Sporting Community and Town Center Complex in Emerson, Ga., just off Interstate 75, about 30 miles northwest of Atlanta. This park represents one of the latest examples in a growing trend […]

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Design considerations for GCLs in leach pad liner systems

October 1st, 2014

By Chris Athanassopoulos and Mark Smith Introduction Traditionally, leach pad lining systems have consisted of a single geomembrane liner placed directly over a prepared subgrade of locally available soil or, occasionally, compacted clay. Heap fills are most commonly constructed by placing a layer of highly-permeable drainage stone (overliner) over the geomembrane, usually with perforated drainage […]

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Polymeric marine mattresses

October 1st, 2014

Case studies highlight marine mattress applications By Jeff Fiske Introduction Marine mattresses are rock-filled containers constructed with advanced UV-stabilized co-polymer geogrid materials. Geogrid panels are laced together to form mattress-shaped baskets that are filled with small stones similar to the construction of gabions. Generally they are filled off-site and installed by lifting into place (Figure […]

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Geosynthetics & wall

October 1st, 2014

Geomembrane patching? Landfill cooling? Puncture protection? Geomembrane patching? Landfill cooling? Puncture protection? Questions and answers from the GMA Techline Using geosynthetics with existing foundation wall The goal of [our] project is to demolish a commercial building and use one of the existing concrete foundation walls as a retaining wall to allow for the construction of […]

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Puncture protection

October 1st, 2014

Geomembrane patching? Landfill cooling? Puncture protection? Geomembrane patching? Landfill cooling? Puncture protection? Questions and answers from the GMA Techline Geomembrane puncture protection I am sizing a cushion geotextile that will be protecting a 40-mil LLDPE closure geomembrane against 2in.–4in. crushed, angular gravel. I understand that the equation for factor-of-safety (FS) against puncture, as presented in […]

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Landfill cooling

October 1st, 2014

Geomembrane patching? Landfill cooling? Puncture protection? Geomembrane patching? Landfill cooling? Puncture protection? Questions and answers from the GMA Techline Landfill cooling? If the difference in temperature between wet waste and the ambient environment contributes to cooling of leachate, is it not appropriate to design landfills with cooling systems to enhance both the rate of degradation […]

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Fabric-formed shells

October 1st, 2014

Geomembrane patching? Landfill cooling? Puncture protection? Geomembrane patching? Landfill cooling? Puncture protection? Questions and answers from the GMA Techline Building fabric-formed concrete thin shells Any suggestions on the type of geogrid or geoweb fabric I can use for shaping and reinforcing thin-shell concrete domes? (Ted | USA) Ted, You ask a great question and one […]

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Bentonite compatibility

October 1st, 2014

Geomembrane patching? Landfill cooling? Puncture protection? Geomembrane patching? Landfill cooling? Puncture protection? Questions and answers from the GMA Techline Bentonite compatibility with propylene glycol Are there any issues regarding bentonite GCL compatibility with propylene glycol? Any information you could share would be helpful. Thanks. (Scott | Massachusetts) Scott, There is no issue with respect to […]

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Geotextile filter

October 1st, 2014

Geomembrane patching? Landfill cooling? Puncture protection? Geomembrane patching? Landfill cooling? Puncture protection? Questions and answers from the GMA Techline Geotextile filter Are there any papers done on the use of a geotextile filter layer below a GCL or CCL? Your assistance in this regard will be much appreciated. (Tian | South Africa) Dear Tian, Thank […]

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Fusion welds

October 1st, 2014

Geomembrane patching? Landfill cooling? Puncture protection? Geomembrane patching? Landfill cooling? Puncture protection? Questions and answers from the GMA Techline Double-track fusion welds Can you offer any guidance on the minimum allowable ambient temperature to perform double-track fusion welds of HDPE and LLDPE geomembranes? Thanks. (Noah | North Carolina) Noah, (1) Regarding the seaming window for […]

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