Benefit/cost analysis as it relates to service life of geosynthetics

August 1, 2020

On the surface, performing a benefit/cost (B/C) analysis is a straightforward process. However, ensuring that such an analysis is accurate and thorough is a much more nuanced task. In 2008, Bob Koerner laid out the procedure for geomembranes in Geosynthetic Research Institute (GRI) White Paper #12 “GS Selection Based on B/C Ratio.” This article expands …

CCR landfill final cover test pad—Part 1

By Nina J. Balsamo, John Massey-Norton, John R. Klamut, Terry Queen,Charles F. Straley and Mark R. Lehner An integrated drainage system (IDS) geomembrane, which provides both a low-permeability membrane and drainage space above the geomembrane, is being used in the final cover at a coal combustion residuals (CCR) landfill in West Virginia. Part 1 of …

New GMA leadership and socially distanced activities

The executive council of the Geosynthetics Materials Association (GMA) has a new chair and first vice chair. Bryan Gee, the director of education and training for Tensar International Corp., has ascended to the chair of GMA, while Steve Thaxton, the business development leader of geosynthetics for Owens Corning, has assumed the position of first vice …

Geosynthetics plays a prominent role

From the Panama Canal to coal ash containment in West Virginia to polyvinyl chloride (PVC) sheet piling in several U.S. states, geosynthetics solve problems. The versatility of the different types of geosynthetics makes them useful in many situations. In “Innovative Geosynthetics Solution Saves 106-Year-Old Panama Canal Structures,” geotextile bags solve an interesting underwater erosion control …

Innovative geosynthetic solution saves 106-year-old Panama Canal structures

By Tom Stephens and Nicolas Ruiz The Panama Canal opened for business 106 years ago and was hailed as the eighth wonder of the world and an engineering marvel. It has become the most consequential global waterway ever constructed. Since 1914, more than a million ships of all sizes have passed through the canal’s original …

Geosynthetics Conference 2021 short course lineup announced

By Barbara J. Connett The Geosynthetics Conference 2021 Organizing Committee is pleased to announce the Short Course Roster. These half-day in-depth courses feature detailed instruction in a small group setting. All courses provide four professional development hours (PDHs) and are included with full registrations at no extra cost.   For full descriptions, visit https://geosyntheticsconference.com/program/short-courses. AASHTO …

Methods to estimate pressures and strains in pond geomembrane bubbles

By Richard Thiel, Hesham Eldesouky and Richard Brachman This article provides an update, validation and improved approach for predicting the shape, pressure and strains that can occur in an exposed geomembrane bubble (aka “whale”) created by gas trapped below the geomembrane in a pond (Figure 1). The October/November 2017 issue of Geosynthetics magazine presented an …

The GMA Techline

Seaming dissimilar geomembranes Q: I kindly request your technical support in the questions below: A nonpolyethylene geomembrane was used in phase 1 of the tailings dam waterproofing system of a gold mine. For the expansion (phase 2), the use of a high-density polyethylene (HDPE) geomembrane is being evaluated. How can the HDPE geomembrane join the bituminous …

PVC sheet piling for cutoff and containment barriers

By Brendan Sheppard and Steve Hargrave Polyvinyl chloride (PVC) sheet piling (Figure 1) has been used for more than 25 years in bulkheads throughout the United States and beyond as a replacement for steel, concrete and timber materials due to the high corrosion resistance it offers in marine environments. More recently, barrier walls have been …