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Geotextile data
October 1st, 2015
Flammability? Zip ties? MARV? Ponds? GT specs? Questions and answers from the GMA Techline. I am a student of hydraulic structures and I need some data about transmissivity of geotextiles (ASTM D4716 or ISO/DIS 12958); and also permittivity or cross-plane permeability (ASTM D5493 or every valid standard). My thesis is about transmissivity and permittivity of […]
Protrusion/particle shape—geotextile cushions
October 1st, 2015
Flammability? Zip ties? MARV? Ponds? GT specs? Questions and answers from the GMT Techline. Our landfill liner project specifications require the use of rounded to subangular gravel to be placed as a leachate drainage layer or leachate collection pipe bedding. The gravel is separated from the geomembrane liner by a nonwoven geotextile cushion. During bidding, […]
Geosynthetics for the management, containment, and closure of CCR disposal facilities
October 1st, 2015
Background Coal combustion residuals (CCR) management and disposal facilities are facing an onslaught of increased scrutiny regarding environmental concerns in the form of the newly implemented CCR regulations and impending effluent limit guidelines and EPA’s 316(b) requirements for containment and closure regulations. For decades, geosynthetic materials have consistently provided engineered solutions for a variety of […]
Tight timeline + extreme specs = a notable RPE geomembrane install
October 1st, 2015
And with weather only Bigfoot could love. Introduction Northeastern British Columbia could, by most definitions, be considered the middle of nowhere. Tumbler Ridge (pop. 2,710), a district municipality in the foothills of the Canadian Rockies bordering Alberta, is and was from its inception in 1981 all about coal. And like many a town with a […]
Zip-tie strength
October 1st, 2015
Flammability? Zip ties? MARV? Ponds? GT specs? Questions and answers from the GMA Techline. We had a problem at one of the construction projects where we were providing CQA. It turned out that the installer had two different types (and apparently strengths) of zip ties. There ended up being seam failures in some of the […]
GRI White Paper #10/Test Method GTI2(A)
October 1st, 2015
Flammability? Zip ties? MARV? Ponds? GT specs? Questions and answers from the GMA Techline. I have reviewed GRI White Paper #10, GRI Test Method GT12(a), ASTM D4354, and ASTM D4759 and have a question. I have reviewed some recent CQA test results of a nonwoven cushion geotextile roll sample and while the average of the […]
Nonwoven needle-punched GT
October 1st, 2015
We specify that the geotextile under riprap must be nonwoven, needle-punched, Class 1. NCHRP Report 568 (page C-25, Section 7.1) requires that nonwoven geotextile filter under riprap must have a mass density greater than 12osy (ounces per square yard). We have the following questions: What is the cost difference between nonwoven needle-punched, Class 1 12osy […]
GMA is a sponsor for Educate the Educators
October 1st, 2015
In late July, I joined representatives from seven GMA member companies to attend the revived Educate the Educators conference held at the University of Texas in Austin. The purpose of the event was to educate university professors from the United States and around the world on the benefits of geosynthetics in this classroom. The two-day […]
Educating the Educators on Geosynthetics
October 1st, 2015
Wouldn’t it be great if graduating civil engineering students knew much more about geosynthetics? Frankly, it would be nice if they at least knew the difference between a geotextile and a geomembrane, wouldn’t it? Often, they don’t have the opportunity to study geosynthetics as part of their undergraduate civil engineering program in most North America […]
Drama in D.C.?
October 1st, 2015
One of my favorite trips every year is the Geosynthetic Materials Association (GMA) Fall Lobby Day. It is usually a good time to be in Washington … not too hot, not too cold, slight chance of rain. It is also the political season for dramatic action—or in recent sessions of Congress—inaction and shutdown talk. The […]