Presto releases GEOWEB ballast research

February 24th, 2018

On Feb. 21, 2018, Presto Geosystems, manufacturer of the HDPE GEOWEB® base stabilization system, released results from rigorous railroad-track research performed to quantify the reinforcement benefit of GEOWEB-confined ballast as compared to unconfined ballast. The company said the research was a cooperative effort under the direction of Ben Leshchinsky, Ph.D., P.E., of Oregon State University, […]

Read More

The durability of exposed geomembrane covers

October 1st, 2017

The most frequently asked question by people in the geosynthetics world is how long is the anticipated lifetime of geosynthetics. So much so that of the more than 3,000 questions submitted to the GMA Techline since it began in 2004, 591 (19.7%) have been on lifetime, aka durability. Of these, 49% were on buried lifetime, […]

Read More

Part 2: The regulation of CCR in the United States: Geosynthetics and barriers

October 1st, 2017

As discussed in Part 1 of “The Regulation of CCR in the United States,” for the first time in decades, nationwide regulation of CCR (coal combustion residuals) surface impoundments expands the regulated use of geosynthetic materials. While the CCR Rule (2015) allows continued operation of existing CCR surface impoundments, it provides criteria for the disposition […]

Read More

Part 1: The regulation of CCR in the United States: Geosynthetics and barriers

August 1st, 2017

The regulation of coal ash (coal combustion residuals or CCR) has significantly expanded the market for geosynthetics within the United States. Further, there is interest in these regulations around the globe in every country using coal as an energy source. These regulations are the result of recent environmental incidents. The regulations call for the increased […]

Read More

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 […]

Read More

Using geosynthetics for macroencapsulation for CCR on-site clean closure

August 1st, 2017

Coal combustion residuals (CCR) have been used for many years in the construction of berms and engineered structural fill applications, including embankments for highways, dikes, and levees. However, large, unencapsulated structural fill projects have become a focus of environmental concerns due to potential leaching of metals and structural failures. Cap-in-place of CCR surface impoundments is […]

Read More

Geomembrane used at South Africa’s first black-woman-owned manganese mine

July 19th, 2017

A geomembrane provided by Zambia’s Kaytech Engineered Fabrics and installed by South Africa’s Aquatan Lining System was used at the Kalagadi Mine, near Hotazel, Northern Cape province, South Africa, about 675 miles (1,085 km) northeast of Cape Town. Kalagadi is the first manganese mine owned by a South African black woman, Daphne Mashile-Nkosi, known as […]

Read More

History of geosynthetics use on national forest roads

June 1st, 2017

Introduction The objectives of this article are to document the long history of geosynthetic materials used in the U.S. Department of Agriculture (USDA) Forest Service and other rural roads, to document the many creative and useful ways geosynthetics have been used, and to promote the cost-effective uses of geosynthetics in road projects today, particularly on […]

Read More