Geosynthetic clay liner with aquiclude

August 1, 2022  |  Q&A: GMA Techline

Q: We are trying to design and construct an aquiclude with a geosynthetic clay liner (GCL). Do you have any experience with this application where a GCL has been used as the impervious barrier between a flowing stream and the underlain geologic formation?
Working on an ethylene interpolymer alloy (EIA) specification

August 1, 2022  |  Q&A: GMA Techline

Q: I have an upcoming project that will use ethylene interpolymer alloy (EIA). Is the Geosynthetic Research Institute (GRI) working on a specification for this material?
What is the CSI code for geosynthetics?

August 1, 2022  |  Q&A: GMA Techline

Q: What is the CSI code for geosynthetics?
Do you have experience with T seams?

August 1, 2022  |  Q&A: GMA Techline

Q: I have a question about T-intersections where three panels of geomembrane meet. In my experience these intersections have all needed to be repaired with a patch. However, a recent project fusion welded straight through these intersections. Air channel testing was completed on the first seam prior…
Liner materials that can perform in the toughest applications

August 1, 2022  |  Q&A: GMA Techline

Q: I am working on a 60 mil (1.5 mm) high-density polyethylene (HDPE) that will receive septage leachate. The pH will be below 5 and probably lower. I am looking for technical literature on liner performance at pH levels possibly as low as 2. Thank you for your assistance.
Impregnation as it relates to seaming geosynthetic clay liners

August 1, 2022  |  Q&A: GMA Techline

Q: We are confused with the term “impregnation” as it relates to seaming geosynthetic clay liners (GCLs). There are two types of impregnations: (1) edge impregnation and (2) complete nonwoven (cap layer) impregnation of GCLs. How does a manufacturer do this? 
Geotextile grab test methods

June 1, 2022  |  Q&A: GMA Techline

Q: I know the American Society for Testing and Materials (ASTM) approves several grips (the requirement is they be “flat”) to perform ASTM D4632 and ASTM D5034. We use a hard, smooth rubber surface for the woven geotextile and a slightly serrated surface for the nonwoven geotextile. One of our c…
Pipe penetrations through geomembranes

June 1, 2022  |  Q&A: GMA Techline

Q: Is there a recommended detail that you can provide or point me toward for pipe penetrations through geomembrane single and double liners?
Geotextile impact testing

June 1, 2022  |  Q&A: GMA Techline

Q: We would like to carry out an impact test on geotextiles as described in Koerner (2012), Chapter 2.3.3 Mechanical Properties-Impact Test and Chapter 2.5.5 Impact (Tear) Resistance. I came across the Geosynthetic Research Institute (GRI) GS2 Test Method for Rupture Strength of Geosynthetics by Pen…
Landfill trenches with geocomposites

June 1, 2022  |  Q&A: GMA Techline

Q: I am wondering if you know of or can point me in the right direction in regard to determining viability of leachate disposal via spraying back onto the active face of a landfill. I have a landfill that has a few issues, and while, from a practical sense, we have had some success with this approac…