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…
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Hybrid geosynthetic clay liners for attenuation of PFAS in landfill leachates

October 1, 2021  |  Features

An exponential increase in understanding of the provenance, migration, and fate of per- and polyfluoroalkyl substances (PFAS) is evident over the past decade. The environmental and health concerns from this group of contaminants are well recognized, but they are still evolving with advancing studies…
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Energy industries use HDPE liners for flowback water evaporation/recycling ponds

October 1, 2021  |  Case Studies, Features

The problem to be solved is the disposal and recycling of millions of gallons of production water (brine water) and flowback water annually generated from the oil and gas industry in an environmentally safe, less costly and efficient manner. A technology that is effective and safe is the evaporation…
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…