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Repeatability and reproducibility in geosynthetics
October 1st, 2021
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? A: One wishes to have the repeatability and reproducibility as “low” as possible, […]
The GMA Techline
October 1st, 2020
Moderated by George R. Koerner Puncture after NDT Q: I would like your opinion on the fate of punctures in the air channel leftover from nondestructive air channel tests (NDTs), specifically in regard to sealing the air channels to prevent leachate or water ingress. We are particularly concerned with this situation on a landfill cover […]
TRI/Environmental to host CQA Training Week
October 11th, 2019
TRI/Environmental is offering two one-day short courses, which may be taken singly or as a package. They are designed specifically for those who need a detailed understanding of proper construction quality control (CQC) and construction quality assurance (CQA) procedures at waste containment facilities. The courses provide ideal preparation for the Geosynthetic Certification Institute’s Inspectors Certification […]
Lessons learned in alternative coal ash pond closure design and construction
October 1st, 2019
By Anna M. Saindon Coal ash pond closures often face unique challenges due to location, available borrow soils and construction constraints. These challenges can lead to alternative methods of closure to comply with Resource Conservation and Recovery Act (RCRA) Subtitle D and coal combustion residuals (CCR) regulations. This article summarizes the construction of the first […]
FGI is making free six-part short course available to public
October 16th, 2018
The Fabricated Geomembrane (FGI) is releasing the presentations from the Aug. 3 “Geosynthetics in Civil Engineering Applications” short course as a six-part webinar series. Three webinars have been released, and three more will be released in the next few weeks. The webinars and release dates are: “Service Life of Geomembranes” by R. Kerry Rowe (9/11/18) “Testing […]
Geocomposite lamination strength ASTM test method: Time for an update
August 1st, 2018
Recent project experience that included continuous peel testing across the roll width of geocomposite materials has shed light on the issue of peel strength between geotextiles and geonets that are heat-bonded together. The variability of peel strength across a roll width is found to be much greater than expected, with the typical standard deviation often […]
The GMA Techline answers all
August 1st, 2018
UV Weathering of Geotextiles Q: My firm is providing construction quality assurance services for a landfill cell expansion. We are having an issue with our contractor and are going to be in a position of having 8 ounces/square yard (271 g/m2) of nonwoven geotextile exposed for a period of time, which exceeds the seven-day limit […]
‘Emerging Topics in Geosynthetics’ is focus of free all-day live-streaming short course
July 20th, 2018
The University of Illinois at Urbana-Champaign (UIUC), in partnership with the Geosynthetic Materials Association (GMA) and the Fabricated Geomembrane Institute (FGI), will live-stream an all-day short course on “Emerging Topics in Geosynthetics,” Aug. 3, from 8:45 a.m. to 3:55 p.m. CDT. The short course is free to geosynthetics industry professionals. Designed as a series of […]
Readers question ‘zero leaks’
October 1st, 2017
To the editor: Efforts toward achieving zero leaks in a waste containment system (“Achieving Zero Leaks on a Budget” in the June/July issue of Geosynthetics) are certainly laudable. Authors Gilson-Beck and Toepfer do a good job of explaining how electrical leak detection surveys can minimize leaks in a geomembrane liner system at the end of […]
Achieving zero leaks on a budget with geomembranes
June 1st, 2017
For more than 30 years, the geomembrane industry has been told that “all geomembranes leak” (Giroud 1984), as if this were some foregone conclusion no matter what might happen from geomembrane manufacturing to the time it is put into service. But recently, the idea of “zero leaks” has been a hot topic at industry conferences, […]