Minimum low temperature for dual hot-wedge seaming

June 1, 2014  |  Q&A: GMA Techline

From the GMA Techline Does the Geosynthetic Research Institute (GRI) offer any guidance on the minimum allowable ambient temperature to perform double-track fusion welds of HDPE and LLDPE geomembranes? (Jonathan | South Carolina) Reply: We have GRI-GM9 Standard Practice “Cold Weather Seaming o…
Geogrid reinforcing behind rigid concrete retaining walls

June 1, 2014  |  Q&A: GMA Techline

From the GMA Techline I participated in the Bologna Symposium and I [was] very happy and honored to see you live. I read a [GMA Techline] answer published in Geosynthetics magazine (Oct./Nov. 2009, p. 58), “Geogrid use behind rigid concrete retaining walls.” You refer to the Japanese rai…
HDPE liner panel orientation?

June 1, 2014  |  Q&A: GMA Techline

From the GMA Techline I am reviewing a construction report where a landfill cell has HDPE one-sided texture laid about 45 degrees from the direction of steepest slope across approximately one-third of the sideslopes. I am looking for quantitative data on any testing done with this type of orientatio…
Techline responds to question from website comment

April 18, 2014  |  Q&A: GMA Techline

From the GMA Techline RE: Reader question from article: Floating geomembrane cover improves biogas collection, heat retention, and odor control I am interested to install cover lagoon digester at my farm. I search some material from Internet for this project. If you share with me some material relat…
The GMA Techline and its 5th set of 500 Q’s-&-A’s

April 1, 2014  |  Q&A: GMA Techline

By Bob and George Koerner Introduction The Geosynthetic Materials Association (GMA) Techline was launched in September 2004—now in its 10th year!—as a free worldwide service to answer questions involving the many aspects of geosynthetic materials. From the outset there were no constraint…
The four Ws of GSI white papers

April 1, 2014  |  News, Q&A: GMA Techline

Why, what, when, and where? According to Wikipedia (my favorite source for all kinds of information), a white paper is “an authoritative report … to understand an issue, solve a problem, or make a decision. White papers are used in two main spheres: government and business-to-business m…
Road stabilizers

February 1, 2014  |  Q&A: GMA Techline

From the GMA Techline RE: Road stabilizers I’m doing research for a landscape architect, and I’m looking into products that reinforce the soil beneath paved roadways. So far, that has led me to a range of geotextile and geogrid systems. In this regard, geosyntheticsmagazine.com has been …
Monitoring moisture change?

October 1, 2013  |  Q&A: GMA Techline

From the GMA Techline RE: Monitoring moisture change? There is an opportunity to monitor an application of the enhanced barrier system at a [municipal] hazardous waste site … for which an extension is currently under construction. The consultant, contractor, client, and authority will be moni…
Carbon footprint of geosynthetics

October 1, 2013  |  Q&A: GMA Techline

From the GMA Techline RE: Carbon footprint of geosynthetics One of my students is working on the topic “of influence of geosynthetics on the reduction of carbon footprint of geosynthetics in pavement construction. We are unable to get any data on the energy required for producing typical geosy…
Critter control and membrane repair

June 1, 2013  |  News, Q&A: GMA Techline

From the GMA Techline RE: Critter control Have you ever heard of an instance where critters (groundhogs, for instance) dug through a geomembrane cap? [We have heard] stories about membrane repair in response to rats and groundhogs. The rats were trapped in a lined floodwall berm. The groundhogs are …