Methods to estimate pressures and strains in pond geomembrane bubbles

August 1, 2020

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 …

A guide for specifying drainage geocomposites

April 1, 2020

By Lisa L. Damiano and Eric S. Steinhauser In September 2017, ASTM International released its Standard Guide for Specifying Drainage Geocomposites (ASTM D7931). The standard provides a guideline for calculating engineering properties related to drainage geocomposites, specifically allowable flow rate, associated reduction factors and shear strength properties. In basic terms, it codified design procedures so …

Recovery of rare earth elements from acid mine drainage using geotextile tubes

October 1, 2019

By Tom Stephens Acid mine drainage (AMD) has been occurring in the Appalachian region since coal mining began in the early 18th century. Over time, many mines reached the end of their useful life and production ceased or companies went out of business, resulting in AMD discharging from these abandoned mines into native streams and …

Impact of geogrids on concrete highway pavement performance

April 1, 2019

The benefits of using geogrids for constructing flexible pavements is well documented. Additionally, the study prepared by White and Vennapusa (2017) discusses the method for field performance verification of the geogrid mechanically stabilized layer. However, this article looks beyond using geogrid mechanically stabilized layers for asphalt pavement design and examines using multiaxial geogrids within concrete …

The 2019 state of the geosynthetics industry

The U.S. and Canadian geosynthetics market includes geotextiles, geomembranes, geogrids, geosynthetic clay liners, drainage materials, geocells and erosion control materials. In 2018 the U.S. and Canadian geosynthetics market grew in the low single-digit range and is expected to grow somewhat higher in 2019. Consolidation continues in geosynthetics market U.S. geosynthetic manufacturers will likely experience stiff …

Talking geosynthetics with Congressman Bruce Westerman

August 1, 2018

One of the few professional engineers in Congress, Republican Rep. Bruce Westerman of Arkansas pulls no punches when discussing the potential use of geosynthetics in federal infrastructure projects. “I think geosynthetics should be part of the toolkit,” Westerman said during a phone interview with Geosynthetics magazine on May 19. First elected to Congress in 2014 …

Update: High-elevation geofoam at Snowbird

October 1, 2017

All projects have challenges, purpose and meaning, yet some projects mean a lot more to owners than others. It takes a visionary to leave a legacy, and Richard Bass, founder of Snowbird Ski and Summer Resort in Utah, was such a man. For starters, Bass is acknowledged as the first person in the world to …

Recap of the 2017 GMA Spring Lobby Day

August 1, 2017

‘Here, sir, the people govern.’ Alexander Hamilton said these words in 1788, remarking on the U.S. House of Representatives during debate on the adoption of the Constitution. At the time, the United States system of government was unique in a monarchical world. Even today, America’s experiment with democracy makes it impossible to go to Capitol …

2017 State of the Specialty Fabrics Industry

April 1, 2017

The U.S./Canadian geosynthetics market includes geotextiles, geomembranes, geogrids, geosynthetic clay liners, drainage materials, geocells, and erosion control materials. In 2016, the size of the U.S./Canadian geosynthetics market was $2.6 billion, up 3.5% over 2015. It is expected to swell to $2.7 billion in 2017, up 4% compared to 2016. In a survey of Geosynthetic Materials …

Long-term durability of geomembrane material and seams

Introduction The Fabricated Geomembrane Institute (FGI), formerly the PVC Geomembrane Institute, in collaboration with the Minnesota Department of Natural Resources (Minn. DNR), has been conducting a study assessing the long-term durability of PVC geomembranes. Samples of three different 30-mil PVC geomembranes were placed at the bottom of a settling basin near the northern Minnesota town …