Getting the most out of GeoNashville 2021 and looking toward 2023

October 1, 2021  |  Events, News

GeoNashville, Nov. 4–5, 2021, at the Music City Center in Nashville, Tenn., is just around the corner. This face-to-face geosynthetics event brings attendees together for 1.5 days of plenary presentations and panel discussions from the Federal Highway Administration (FHWA), U.S. Army Corps of Engi…
Fall Lobby Day, GeoNashville and Geosynthetic Materials Association Executive Council happenings

October 1, 2021  |  Events, GMA News, News

Are you registered for the Fall 2021 Lobby Day, Oct. 20, in Washington, D.C.? Will we see you in person at GeoNashville, Nov. 4–5? As you are reading this, we are preparing for the first two returns to in-person activities for the Geosynthetic Materials Association (GMA). Here are the current opti…
New anchorage and connection strength tests for geosynthetics

October 1, 2021  |  GSI News, News

Connections can have a significant impact on the performance of exposed geosynthetic systems. The connection must be considered as a limiting strength factor and evaluated by the same performance standards as the material alone. If used in critical structures with design lives of more than 30 years,…
Next-generation geogrid installed under a paved road

October 1, 2021  |  Final Inspection

In April 2021, Rantoul Foods in Rantoul, Ill., was undergoing an expansion of its building and grounds. A daily, continuous flow of semitrucks delivering livestock required a paved road designed to last. High-quality techniques prevailed throughout construction of the new facility, and the same high…
Geosynthetics for CCR, PFAS and energy applications

October 1, 2021  |  Editorial

This issue of Geosynthetics magazine delves deep into two innovative uses of geosynthetic clay liners (GCLs) in very different applications: coal combustion residual (CCR) leachates and per- and polyfluoroalkyl substances (PFAS) mitigation in landfills. We also examine three case studies of energy c…
Heat resistance of geomembranes

October 1, 2021  |  Q&A: GMA Techline

Q: We have a question in regard to the heat resistance of geomembranes. We are interested in paving a road over a geomembrane with hot mix asphalt and want to know if the geomembrane will continue to function as a moisture barrier?
Repeatability and reproducibility in geosynthetics

October 1, 2021  |  Q&A: GMA Techline

Q: If repeatability and reproducibility are high, it is a positive output, but high repeatability and reproducibility will give high uncertainty from Equation 1: uncertainty = sqrt (repeatability^2 + reproducibility^2. Could you explain to me why it looks like it is contradictory?
Measuring strain in geosynthetics

October 1, 2021  |  Q&A: GMA Techline

Q: Currently, what is the best-known method to measure strains in geosynthetics? We are having arguments between results generated from crosshead movement and extensometers.
Residual strength of a geosynthetic clay liner

October 1, 2021  |  Q&A: GMA Techline

Q: I was wondering if I could get some input about the residual strength of a geosynthetic clay liner (GCL). We have lab results where it is “flatlining” for the residual case (Figures 1 and 2, and Tables 2–4). The GCL is proposed for use in a landfill cell with ultimately a maximum of 98 feet…
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Using bentonite-polymer composite geosynthetic clay liners to contain CCR leachates

October 1, 2021  |  Features

Coal combustion residuals (CCRs) are the byproducts from combustion in coal-fired boilers that are disposed in lined landfills when they cannot be used beneficially in other applications (EPRI 2009) (Figure 1). Land disposal of CCRs is regulated under the “coal ash rule” incorporated into Subtit…