Anchors, tie-rods and whalers

April 1, 2021  |  Q&A: GMA Techline

Q: We are having issues related to obstructions in the reinforced zone of our mechanically stabilized earth (MSE) retaining walls. In the first case, there is a rock outcrop that is limiting the length of the geogrid reinforcement. In the second case, we have a drop-down inlet structure to divert st…
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Geomembranes for reinforcement?

April 1, 2021  |  Q&A: GMA Techline

Q: We are using Robert Koerner’s Designing with Geosynthetics to calculate the required thickness of a geomembrane.
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Installing a geomembrane low to high gradient?

April 1, 2021  |  Q&A: GMA Techline

Q: We are a large liner installation firm that has been asked to install a geomembrane liner from low gradient to high gradient. Is this the new normal?
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GRI-GM19 peel specification

April 1, 2021  |  Q&A: GMA Techline

Q: Our liner system is a double composite and along a western tie-in. We need to extrusion-weld the secondary 60-mil (1.5-mm) HDPE (new cell) to an existing secondary 40-mil (1-mm) HDPE (old cell), and the state is continuing to have issues with the fact that we are using the 40-mil (1-mm) GRI-GM19 …
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Concrete interlayers

April 1, 2021  |  Q&A: GMA Techline

Q: We are interested in using a geotextile as an “unbonded concrete interlayer” over existing concrete pavement to float the new slab over deteriorated pavement, instead of a thin asphalt layer. Do you have any guidance for us in this regard?
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Modular geosynthetics construction

April 1, 2021  |  Features

Modular construction is a process in which a building or other item is constructed primarily off-site; under controlled factory conditions; and using the same design, materials, equipment, testing and construction quality control and assurance (CQC/CQA) techniques as a field-constructed facility—b…
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Development of a new design method for geosynthetic-reinforced RPEs

April 1, 2021  |  Features

Rapid and extreme climate change is putting our planet under stress. As a consequence, in mountain and hilly regions, infrastructure and people are more often threatened by quick and unpredictable rockfall events. Falling boulders can have extremely high speeds, exceeding 11 mph (5 m/s) and up to 67…
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Comparative analysis of the flow and filtration capabilities of sediment retention devices—Part 2

April 1, 2021  |  Features

Sediment retention devices (SRDs) include silt fences, wattles, filter logs, compost socks and various types of stormwater inlet protectors. They are a widely used best management practice (BMP) to provide sediment filtration from stormwater runoff while allowing water passage. However, SRD performa…
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Chair’s corner and GMA happenings

April 1, 2021  |  GMA News

By Bryan Gee What’s in a name? For those of us who work in the geosynthetics industry, this question may be more important than you think. A recent call with a high-level federal policy maker brought this home to me. With no prior knowledge of our industry, this person did not understand what geos…
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Update from IGS-NA

April 1, 2021  |  IGS-NA

by John Allen The IGS North America (IGS-NA) board is working diligently on diversity within its membership and representatives. The organization is expanding the number of liaisons to the board to include all the major North American technical societies that influence geosynthetics. IGS-NA provides…
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