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The 2023 Koerner Lecture Q&A session
April 1st, 2024
George Koerner: Geomembranes used as landfill liners may experience differential settlement or local strain due to protrusions or anomalies in the subgrade. Therefore, it is important to define a maximum allowable strain that any given geomembrane can tolerate without compromising its integrity. Do you have an opinion on what this strain limit should be for […]
New methods of producing geomembranes by Selective Laser Sintering
July 27th, 2023
Geomembranes are widely used in various applications, such as environmental protection, mining, agriculture, and civil engineering, due to their ability to provide impermeability and barrier properties. Traditionally, geomembranes have been manufactured using cast flat-bed extrusion or blown-film extrusion techniques. However, in recent years, a new method called Selective Laser Sintering (SLS) has emerged as a […]
Lining a tailings facility on the roof of the world
July 10th, 2023
Solmax geomembranes were used to line the tailings facilities of the recently expanded Yulong Copper Mine. The mine located in the Qinghai-Tibet Plateau, on one of the largest copper deposits in China and is important to the economy of the region. The mine is located in some of the highest elevations in the world. The […]
How to attach and terminate geomembranes on a concrete structure
June 15th, 2023
HDPE and LLDPE geomembranes are commonly utilized as barriers and covers in various containment facilities, including solid waste landfills, liquid containment areas, mining ponds, agriculture, and aquaculture ponds. The connection of geomembranes to concrete walls and ancillary structures, such as pipe penetrations or outlet structures under hydraulic pressure, plays a crucial role in ensuring proper […]
Updated accelerated aging test for geomembranes
June 1st, 2023
FIGURE 1 Star fold coupon The accelerated aging process is based on the relationship between temperature and chemical reaction rate, in which the reaction rate increases as temperature rises. Most accelerated aging tests use higher temperatures to accelerate the aging process by representing real-time aging artificially. A good accelerated aging test should simulate real-time aging […]
COMANCO completes preserving tank liner project
May 10th, 2023
COMANCO has installed 29,000 square feet of 40mil HDPE textured geomembrane and geocomposite on 0.60 acres at the Preserving Tank Farm in Alabama. The project is 100% complete. The project involved installing 40mil textured liner on the concrete walls, following installation of the stainless steel batten bar to columns to ensure a tight seal. The […]
Geosynthetics for CCR, PFAS and energy applications
October 1st, 2021
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 companies using high-density polyethylene (HDPE) geomembranes for flowback water in water evaporation/recycling ponds. […]
Measuring strain in geosynthetics
October 1st, 2021
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. A: This question arises often when comparing ISO 527/ASTM D638 and ASTM D6693 results. The former requires an extensometer, where the latter utilizes crosshead deflection and assumes gauge lengths. This discussion […]
Geomembrane freshwater bladders for eco-friendly beach resort
August 31st, 2021
Photograph courtesy of Solmax An eco beach resort in an undeveloped wilderness area in Panama needed to find a way to store fresh water (rainwater) for use during dry spells. The goal of the resort is to educate while entertaining and to reduce the impact on the environment. It was thus important to the resort […]
An open solicitation to join in a round-robin effort to find a substitute for Igepal CO-630
June 1st, 2021
Improved stress-cracking resistance in high-density polyethylene (HDPE) geomembranes has been a quest of our industry and a hot research topic for years. The Geosynthetic Institute (GSI) has been working in this area since the mid-1980s. The GRI GM13 standard specification for HDPE geomembranes has moved the ASTM D5397 (appendix) single point notch constant tension load […]