All Articles

GeoAmericas 2012â€”Lima, Peru

October 1, 2011 | News

By Elizabeth Peggs GeoAmericas 2012 will be held May 1-4 in the San Isidro district of Lima, the capital and largest city in Peru. San Isidro is the epicenter of the region’s finance, business, and mining interests. The importance of this district, however, is not all that makes this next inst…

Fabricated geomembranes and cold weather

October 1, 2011 | Products

By Andrew Mills One of the key advantages of fabricated geomembranes is the ability to take large sheets into the field to minimize field welding. Nowhere is this more important than in cold or wet weather. As winter moves in, installation conditions can deteriorate rapidly from rain, snow, and cold…

GSI fellowship status for 2011-2012 academic year

October 1, 2011 | News

By Bob Koerner & George R. Koerner As in the past, GSI has been awarding graduate fellowships for students performing geosynthetics research. It is a worldwide program and one in which the awards are based on student proposals. (There were nine new proposals this year.) These proposals were then…

Extrusion welds

October 1, 2011 | Q&A: GMA Techline

GMA techline answers from Bob Koerner RE: Welds Are destructs typically conducted on extrusion welds? Our flexible membrane liner (FML) spec doesn’t specifically address this. It does explicitly list a destruct frequency of every 500 linear feet of seam length. Does “seam” refer to…

Draping and spraying

October 1, 2011 | Q&A: GMA Techline

From the GMA Techline RE: Draping and spraying I am looking for a geosynthetic fabric webbing or netting that can be draped and then sprayed with concrete. (Ted | California) Reply: I suspect you are talking about shotcrete of gunite and my answer is accordingly. Fabric-wise, you are probably best w…

Pond liner

October 1, 2011 | Products

From the GMA Techline RE: Pond liner We have some air pockets under the geomembrane as the pond fills with water. Rather than try to cut and patch the flexible membrane liner (FML), would it not be easier to simply leave the anchor trench unfilled in those areas to “burp” the air out up …

Leak location

October 1, 2011 | Features

From the GMA Techline RE: Leak location I have been reading though the GSI White Paper #8 regarding the CQA method. I am designing a reservoir that will be around 50ft deep and has many 2:1 sideslopes (uncovered 60-mil HDPE liner) that I would also need to test for leakage. It doesn’t seem tha…

Comparing GCLs

October 1, 2011 | Products

From the GMA Techline RE: GCLs I need some assistance in comparing two geosynthetic clay liners for a project where the specification gives a total bentonite mass required of 4500g/m2 and a target hydraulic conductivity of < 5 × 10-11. We have an option of a liner that far exceeds the requi…

Liner questions

October 1, 2011 | Products

From the GMA Techline RE: Liner questions I am designing a surface impoundment with interior side slopes of 1.5H:1V. This impoundment requires (per regulations) a geosynthetic clay liner (Bentomat DN or equivalent), 40-mil HDPE secondary liner, and 60-mil HDPE primary liner. A leak-detection system …

Reduced CO2 emissions and energy consumption with geosynthetic installations

October 1, 2011 | Products

From the Geosynthetics Research Institute’s 24th conference, 2011.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 pe…