HUESKER to host webinar on GEC systems

October 8, 2018

HUESKER will host a free webinar on geotextile encased columns (GEC) on Oct. 8 at 11 a.m. EDT. Oliver Detert, Head of the Engineering Department at HUESKER, will lead the webinar. The geotextile sleeve allows the accommodation of high vertical loads by compensating for the lack of lateral support to the granular columns from the …

GSI’s Koerner to host webinar on the development of geosynthetic drainage, GMA members get discounted rates

August 21, 2018

The Geosynthetic Institute (GSI) will sponsor a webinar entitled “Sand Drains-to-Wick Drains-to-Sand Columns,” on Sept. 12, from 11:30 a.m. to 1 p.m. EDT. The webinar will be hosted by Dr. Robert M. Koerner. GMA member companies and their employees receive discounted rates on all GSI webinar and short course registrations. This webinar will begin with …

O-I chooses steel reinforced geosynthetic drainage improvements for a Texas landfill

May 17, 2018

In December 2017, Owens-Illinois, commonly known as O-I and one of the largest glassmakers in the world, took action to improve the drainage system for their glass container landfill situated near the company’s O-I Waco manufacturing facility in Waco, Texas, Contech Engineered Solutions said in a press release. The consulting engineer worked closely with the …

GSI hosts webinar on MSE wall back drainage design

May 9, 2018

The Geosynthetic Institute (GSI) will sponsor a webinar entitled “MSE Wall Back Drainage Design,” on May 23, 2018, from 11:30 a.m. to 1 p.m. EDT. Within GSI’s database of 301 failed mechanically stabilized earth (MSE) walls reinforced with geogrids or geotextiles, 64% have failed due to water. Furthermore, 73% have been constructed with fine-grained silt …

Members Only  

Geocomposite drain flow capacity: ISO VS. ASTM

February 1, 2014

From the GMA Techline RE: Geocomposite drain flow capacity: ISO VS. ASTM We are evaluating geocomposite drain products for underdrainage beneath geomembrane-lined ponds. This is an international project—we are considering non-North American products for which the hydraulic properties are based on EN ISO 12958 rather than on ASTM D4716. Would you kindly comment on how …

Members Only  

Apparent opening size (ASTM D4751) for geotextiles

From the GMA Techline RE: Apparent opening size (ASTM D4751) for geotextiles Our specification calls for a geotextile with an AOS of #50 U.S. sieve (0.3mm). I understand that unlike the rest of the technical property values, AOS is specified by the maximum value (i.e., MaxARV not MARV). Please advise. Does it mean that I …

Members Only  

More silt fence

From the GMA Techline RE: More silt fence Also, I have another question regarding geo properties and their specifications. Permittivity is an indicator of how well water can flow through the fabric. AOS is an indicator of the soil particle size held back by the fabric. The permittivity specification is a minimum value while AOS …

Members Only  

Cover veneer stability and freezing

From the GMA Techline RE: Cover veneer stability and freezing I received a question recently from a regulator on whether freezing conditions could result in reduced interface shear strength between a geocomposite drainage layer and a geomembrane for a cover system with three feet of overlying soil. We have not historically seen freezing and ice …

Members Only  

How tubular drainage geocomposite was used in landfill final cover

June 1, 2013

A first for landfills in the southeastern United States. By Thomas B. Maier, P.E., and Stéphane Fourmont Introduction In landfill final cover systems, geocomposite drainage products are frequently used as a drainage layer above the geomembrane layer and for surficial landfill gas collection, either in strips or as a continuous layer, below the geomembrane. For …

Back to the waterfront (in Toronto)

April 1, 2013

By Ron Bygness In the October/November 2011 issue of Geosynthetics, we looked at how a popular section of Toronto was being redeveloped, thanks to the drainage power of the mighty little wick drain. The article “On the waterfront (in Toronto)” specifically featured the West Don Lands, an 80-acre area situated just inland from what developers …