Three very different uses of geosynthetics

April 1, 2021  |  Editorial

In this April/May issue of Geosynthetics magazine, our feature authors tackle three very different uses of geosynthetics with in-depth examination, testing and even a new design method.  In the introduction to their article, “Modular Geosynthetics Construction,” E. Silva, T. D. Stark and Duff S…
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…
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.
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?
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 …
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  |  Feature

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  |  Feature

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  |  Feature

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…
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…