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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 […]
GMA and FGI to host part 2 of a webinar on the stability of geosynthetic lined slopes
May 15th, 2018
The Geosynthetic Materials Association (GMA), in collaboration with the Fabricated Geomembrane Institute (FGI), will present the second of this two-part, free webinar series on May 31, 2018, at 12:00 p.m. EDT. The webinar will discuss the importance of geosynthetic interface strengths on slope stability, when to use peak and residual geosynthetic interface strengths, how to […]
GMA Techline
August 1st, 2017
Liner repair? Pullout tests? Sewn seams? Shear strength of sludges? Geomembrane liner repair Q: I have a facility that has submitted liner repair documentation for the repair of a high-density polyethylene (HDPE) liner for a leachate/stormwater pond at an industrial landfill site. The repairs were performed using either a patch or, for indentations and small […]
In the classroom: Part 2: Geosynthetic coursework at Syracuse University, and Part 3: Geosynthetics education from IGS–NA
August 1st, 2017
Introduction This article is part of a 4-part series on how engineering students or practicing engineers learn about geosynthetic materials. Geosynthetic materials have been used in civil and environmental engineering applications for more than three decades. The benefits of geosynthetic materials are widely recognized, and they are used in a variety of industries. The high […]
Part 2: New design models for MSE walls and slopes
June 1st, 2017
Introduction The design of many geotechnical structures is based on limit-state conditions. For example, in designing gravity walls, the load exerted by the retained soil on the wall is based on an assumed active state of stresses. That is, the wall moves sufficiently outward, enabling the retained soil to mobilize its shear strength along a […]