2016 State of the Specialty Fabrics Industry

April 1, 2016

The U.S./Canada geosynthetics market includes geotextiles, geomembranes, geogrids, geosynthetic clay liners, drainage materials, geocells, and erosion control materials. In 2015, the size of the U.S./Canada geosynthetics market was $2.3 billion, up 4.5% over 2014. It is expected to swell to $2.4 billion in 2016, up 5% compared with 2015. In a survey of Geosynthetic Materials …

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Part 2: Field evaluation of the performance of unpaved roads incorporating geosynthetics—Planning

Introduction Scope and terminology The mechanisms that govern unpaved road performance are complex. Therefore, it is legitimate to try to get quantitative data from laboratory and field tests, but test interpretation can be correct only if there is a good understanding of the mechanisms (which was the purpose of the Part 1 article), rigorous planning …

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Part 1: Mechanisms governing the performance of unpaved roads incorporating geosynthetics

February 1, 2016

Authors’ note: Road improvement is one of the major applications of geosynthetics. It is also one of the most complex because of the variety of mechanisms involved. This Part 1 article provides a description of the mechanisms that govern the performance of unpaved roads incorporating geosynthetics. It will be followed, in the next issue of …

New initiatives to promote geosynthetics education in civil engineering curricula

The North American Geosynthetics Society (NAGS) is currently helping to re-establish the “Educate the Educators” (EtE) program. With the support of the Geosynthetic Materials Association (GMA) and sponsors such as the Geosynthetic Institute (GSI), IGS–NA developed a two-day event where experts in the geosynthetics field introduced 40 college professors to various geosynthetic materials and their …

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Part 1 Durability of geosynthetics: The basics

August 1, 2015

By John H. Greenwood Author’s note This article is based on a training presentation delivered on Sept. 24, 2014, at the 10th International Conference on Geosynthetics in Berlin, Germany. That talk was itself based on courses given at ERA Technology, Leatherhead, U.K., with Alan Friday, and later at SKZ in Würzburg, Germany, with the participation …

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Geosynthetics and Katrina: 10 years after

August 29, 2005, was K-Day for New Orleans. Hurricane Katrina had been ginning up for days off the Bahamas and Gulf of Mexico. By the evening of the 28th, she had the Crescent City in her crosshairs. Early morning on the 29th, Hurricane Katrina struck the Gulf Coast of the United States. When the storm …

Gaining a better understanding of the porometer test (ASTM D6767)

June 1, 2015

By Bruce Lacina and Melissa Medlin 1. Introduction The ASTM international standard test method for pore size characteristics of geotextiles by capillary flow test provides a wealth of information about the physical makeup of the structure and pore spaces in a geotextile sample. This test is often referred to as the pore size distribution (PSD) …

Report from the North American Geosynthetics Society (NAGS)

April 1, 2015

By Bob Mackey ASTM Committee D35 on Geosynthetics The ASTM Committee D35 on Geosynthetics met in New Orleans, La., Jan. 28–30, 2015. There was significant progress within several of the D35 subcommittees as noted here: Subcommittee D35.03 on Permeability and Filtration The issue that generated a great deal of discussion at the January meeting of …

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Design considerations

February 1, 2015

By Richard Thiel, Edward Kavazanjian Jr., and Xuan Wu Introduction Figure 1 shows a conceptual cross section of a landfill sideslope, including final grades at the end of waste placement and the ultimate grades due to the settlement that occurs following the end of waste placement. Settlement at any point in the landfill will be …

Allowable stress on geonets based on laboratory creep tests

October 1, 2014

By Dhani Narejo and Sam Allen Introduction The first article in this three-part series presented compressive stress-strain behavior of several different geonet structures. The collapse, or rollover, does not occur for many types of geonets. In the absence of a rollover, the compression of geonets is non-linear in most cases with the compression rate being …