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New GSI test method for resistance of conductive geosynthetics
June 1st, 2022
The Geosynthetic Institute (GSI) has a new test method for resistance measured across positions on conductive geosynthetics. Conductive geosynthetics contain an electrically charged backing (usually a thin layer of polyolefin with letdowns containing 20%–30% carbon black) that allows leaks to be detected in lined systems without the need for a conductive subgrade beneath the liner […]
GSI Lifetime Predictions of Nonexposed and Exposed Geosynthetics webinar June 8
May 31st, 2022
Photograph courtesy of Solmax The Geosynthetic Institute (GSI) will sponsor a webinar, “Lifetime Predictions of Nonexposed and Exposed Geosynthetics,” on June 8, from 11:30 a.m. to 1 p.m. EDT. Geosynthetic Materials Association (GMA) member companies and their employees receive discounted rates on all GSI webinar and short course registrations. Learning objectives of the webinar Webinar […]
GSI landfill covers webinar upcoming
April 26th, 2022
GSI landfill covers webinar on May 11 will focus on the various components included in geosynthetic final covers for solid waste landfills. Geomembrane landfill cover, one type of emerging geosynthetics to be discussed in the GSI landfill covers webinar. Photograph courtesy of Layfield Group Ltd. The Geosynthetic Institute (GSI) will sponsor a webinar, “Landfill Covers: […]
Layfield’s Fraser joins GSI board
April 20th, 2022
Layfield’s Fraser joins GSI board of advisors, bringing his 40+ years' experience in the geosynthetics industry to GSI. Brian Fraser joins GSI board of advisors. Photograph courtesy of Layfield Group Ltd. The Layfield Group Ltd. announced that Brian Fraser, vice president of business development for Layfield Geosynthetics, has been appointed to the Geosynthetic Institute (GSI) […]
Geosynthetic Institute landfill failure webinar upcoming
April 8th, 2022
Geosynthetic Institute landfill failure webinar on April 20 will focus on 20 lined and unlined municipal solid waste (MSW) landfill failures. A recent installation of a geosynthetic clay liner (GCL) at a landfill in Australia. Photograph courtesy of Geofabrics Australasia Pty Ltd. The Geosynthetic Institute (GSI) will sponsor a webinar, “Behavior and Analysis of Twenty […]
Welding HDPE geomembranes with biogas present
April 1st, 2022
Q: We are a Brazilian company specializing in biogas plants. We have built a big lagoon biodigester with a high-density polyethylene (HDPE) geomembrane cover. Now the cover is leaking liquid contained in the lagoon: We are organizing the repair procedure, and we would like to first investigate state-of-art practices and procedures for welding HDPE geomembranes […]
NSF 61-certified HDPE geomembranes
April 1st, 2022
Q: Hi, we are looking for options for NSF 61-certified high-density polyethylene (HDPE) liners for installation in a potable water tank, 95th-percentile concentration of free chlorine in the tank is 1.2 ppm (1.2 mg/L). The current liner (60-mil [1.5-mm] textured HDPE, installed in 1999) is damaged and needs to be repaired or replaced. We are […]
Impregnation of GCLs
April 1st, 2022
Q: We are confused with the term “impregnation” as it relates to seaming geosynthetic clay liners (GCLs). There are two types of impregnations: (1) Edge impregnation, and (2) complete nonwoven (cap layer) impregnation of GCLs. How does a manufacturer do this? A: The edge impregnation of GCLs (1) is done in the field by an […]
GCL-GM geocomposite: Which end is up?
April 1st, 2022
Q: In a geosynthetic clay liner-geomembrane (GCL-GM) geocomposite, does it make any difference which side of the geocomposite is up: GM or clay? A: This is a very detailed question that is application specific. The following design details all need to be considered: Is the GCL-GM geocomposite used for a liner or a cover, is […]
Calendared nonwoven geotextiles
April 1st, 2022
Q: What is the difference between normal nonwoven and calendared nonwoven (both needlepunched) geotextiles? Where can we use calendared nonwoven geotextiles? A: Calendared nonwoven geotextiles are passed between a set of heated rollers that applies normal pressure as a tertiary process of the production. This process increases the modulus, strength, tear resistance, puncture resistance and […]