Geomembranes with better performance

February 1, 2023  |  Q&A: GMA Techline

Q:We are researching liner alternatives for an industrial client that will have lined impoundments subject to high temperature influent (>140 degrees F), low pH (1 SU+/-), and may have organic contaminants. Are there any polyethylene geomembranes that meet these requirements? 
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Geogrid durability and cement

October 1, 2022  |  Q&A: GMA Techline

Q: I am searching for data or specifications pertaining to long-term degradation resistance of geogrid exposures to cement—more specifically, cement-treated soils. Your assistance would be greatly appreciated.
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Underwater wick drain installation

October 1, 2022  |  Q&A: GMA Techline

Q:We have an underwater wick drain application in the Delaware River adjacent to the Delaware Memorial Bridge. S. T. Hudson Engineers Inc. is working with the Delaware River & Bay Authority (DRBA) on a ship collision protection system (SCPS) at the piers in the river. There is up to 50 feet (15 …
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Designing Reinforced Soil Structures

October 1, 2022  |  Q&A: GMA Techline

Q: Why is strain compatibility important in designing reinforced soil walls?
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Liner system leakage estimations

October 1, 2022  |  Q&A: GMA Techline

Q: What is the anticipated leakage rate through a composite liner (i.e., geomembrane on low-permeability soil) system?
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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?
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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?
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What is the CSI code for geosynthetics?

August 1, 2022  |  Q&A: GMA Techline

Q: What is the CSI code for geosynthetics?
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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…
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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.
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