New round-strand innovation in biplanar geonet structure

April 1, 2010  |  Products

An example of a solution to the problem of high-stress rollover for biplanar geonets. By Dhani Narejo and Mengjia Li Background The primary design property of drainage geocomposites is flow rate or transmissivity, which is measured in the laboratory according to ASTM D4716. The laboratory value is u…
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Welding LLDPE/HDPE

April 1, 2010  |  Products

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 di…
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Geocell application

April 1, 2010  |  Products

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 applicatio…
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Testing HDPE geomembrane liners

April 1, 2010  |  Products

From the GMA Techline Subject: Testing We prepared specifications for [a landfill] liner section that included parameters for nondestructive testing of the primary (80-mil) and secondary (60-mil) HDPE geomembrane liner. At this time, there is a need to install a 30-mil liner along the sideslope. It …
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Optimum height for geotextile storage

April 1, 2010  |  Products

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 “spec…
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Carlisle Energy introduces new landfill closure system

April 1, 2010  |  Products

Carlisle Energy Services Inc., (CES) a wholly owned subsidiary of Carlisle Construction Materials Inc., has introduced its Spectro PowerCap landfill closure system: a dual-purpose system that provides environmental protection while generating clean, solar electricity, according to a press release fr…
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Geotextiles are protecting pipelines

February 1, 2010  |  Products

Steel transmission pipelines installed in mountainous regions often face significant risks during their construction and service life. One of the biggest challenges is to protect the pipe and its external coatings against mechanical damage. Currently, the pipeline industry uses a wide range of suppl…
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TenCate describes large geotextile tube order for Malaysia project

December 2, 2009  |  Products

TenCate Geosynthetics Asia secured an order at Huntsman Tioxide in Teluk Kalong (Malaysia) for the supply of 105 TenCate Geotube systems, according to a press release from the company. These systems are intended for use in Malaysia as an environmentally friendly solution for the dewatering and stora…
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Geosynthetics: Recalling the days of yore

October 7, 2009  |  Products

The history of geosynthetics has been richly documented by our scholars, researchers, writers, and manufacturers—to list but a handful of sources. Excerpts from these sources are offered here as a “look back.” Compiled and edited by Ron Bygness Magazine reports from the early &lsqu…
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Geocells: The early days with the Army Corps

October 7, 2009  |  Products

What many people may not know about the early development of the geocell cellular confinement system is that the material wasn’t always black. In fact, early testing of a “grid confinement” system included wax-coated craft paper; a plastic drainage pipe matrix fastened with staples…
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