The GMA Techline

August 1st, 2019

Moderated by Robert M. Koerner, George R. Koerner and Y. “Grace” Hsuan A geotextile for unpaved driveway/road? Q: Is there any point in using a 150 g/m2 (4.4 oz/yd2) nonwoven geotextile in building an unpaved gravel driveway or gravel road? If so, what should be the most important characteristics of the fabric and what are […]

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Commentary on flood abatement using geosynthetics

August 1st, 2019

By Robert M. and George R. Koerner Figure 1a: Geosynthetic reinforced steep soil slopes (courtesy W. Hsieh On Sept. 8, 1900, a Category 4 hurricane struck Galveston, Texas, which is situated on the Gulf of Mexico about 8 feet (2.4 m) above sea level. The storm created a 15-foot (4.6-m) storm surge, killing 8,000 to […]

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The GMA Techline

June 1st, 2019

Who is doing the testing? Q: This question relates to the number of rolls to be selected as the lot sample for specification conformance testing and refers to ASTM D4354. When I look at this standard, it appears the values in Table 1 of GRI’s White Paper #10 refer to the number of units to […]

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Reflections on sustainability with respect to geosynthetic materials

June 1st, 2019

By Robert M. and George R. Koerner Listening to and reading the news, there seems to be regular criticism of all plastics insofar as concerns as to their post-use disposal in light of their exceedingly long lifetimes. Rarely, if ever, is the distinction made as to which plastics are really necessary to society and which […]

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MSE wall failures can be mitigated through the use of geotextile filters

April 1st, 2019

For the past 17 years, the Geosynthetic Institute (GSI) has been accumulating data on failures of geosynthetic reinforced mechanically stabilized earth (MSE) retaining walls. We presently have 320 cases, of which 201 (63%) have been caused in whole or part by water within, or adjacent to, the reinforced soil zone. We sincerely hope that our […]

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The GMA Techline

April 1st, 2019

Vegetation causing gases under geomembrane? Q: I have a site where we are installing a high-density polyethylene (HDPE) liner in an existing pond. Because of some residual heavy metals in the top layer of soil, I would like to strip off the top 3–6 inches (7.6–15.2 cm) of soil and vegetation. Alternatively, we could mow and […]

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The GMA Techline

February 1st, 2019

Geomembranes for canal lining Q: Our company is an international member of the Industrial Fabrics Association International (IFAI). Our government is planning to line their water canals with a geomembrane to prevent water seepage into the soil. We have been approached by many to suggest the most suitable material with specifications to guide them in […]

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Changing the ‘one per 500 feet’ paradigm on geomembrane field seam sampling

February 1st, 2019

The late Henry Haxo Jr., Ph.D., former president of Matrecon Inc., deserves considerable credit for developing many of the concepts and practices involved in waste containment liner and cover systems. Beginning in the 1970s, various projects, many of them funded by the U.S. Environmental Protection Agency (EPA), were actively researched. His capstone document is the […]

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Christopher honored with 2018 Koerner award and lecture series

February 1st, 2019

The Geosynthetic Materials Association (GMA), led by a Koerner awardee selection task force, chose Barry R. Christopher, Ph.D., P.E., as the recipient of the 2018 Robert M. Koerner Award and Lecture Series. The award and lecture series is named for Robert M. Koerner, Ph.D., the founder and director emeritus of the Geosynthetic Institute and professor […]

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The many applications for geosynthetics in the energy sector

October 1st, 2018

The opportunities for geosynthetics in energy applications are nearly endless. There are huge energy categories, such as oil, natural gas and coal, but geosynthetics also play a role in nuclear energy, hydropower, wind power and solar power, among others. Geosynthetics line storage tanks, support roads to remote sites, line tailings ponds, provide filtration, dewater coal […]

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