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From Our Readers: Woven monofilament geotextile for glacial soils?
October 1st, 2018
To the editor: Regarding your article “Springtime Failure of a Cold-Climate Geotextile Riprap Slope” in the June/July issue of Geosynthetics magazine, I believe woven slit film (WSF) fabrics are inappropriate as “filter fabric” for subsurface drains or beneath hard armor in erosion control applications. WSF have insufficient porosity, percent open area and permeability to relieve […]
Barry R. Christopher honored with 2018 Koerner award and lecture series
September 11th, 2018
The Geosynthetic Materials Association (GMA), led by a Koerner awardee selection task force, selected Barry R. Christopher, Ph.D., P.E., as the recipient of the 2018 Dr. Robert M. Koerner Award and Lecture Series. The award and lecture series is named for Dr. Robert M. Koerner, Ph.D., the founder and director emeritus of the Geosynthetic Institute […]
The GMA Techline answers all
August 1st, 2018
UV Weathering of Geotextiles Q: My firm is providing construction quality assurance services for a landfill cell expansion. We are having an issue with our contractor and are going to be in a position of having 8 ounces/square yard (271 g/m2) of nonwoven geotextile exposed for a period of time, which exceeds the seven-day limit […]
Deploying a geosynthetic mattress ballast layer at an ore-processing site
August 1st, 2018
New applications of geosynthetics are being found that form from overlaps of existing functions, such as protection, separation, filtration and drainage. One new geosynthetic product, the geosynthetic mattress ballast layer (GBL), was first implemented for an ore-processing waste facility protection application in 2015. The GBL is a geotextile containment system that provides a tubular component […]
QA/QC for geosynthetics in waste containment is focus of GSI course
June 26th, 2018
The Geosynthetic Institute (GSI) will host an online course entitled “Course 1: Quality Assurance/Quality Control of Geosynthetics in Waste Containment Facilities,” Oct. 16–18, 2018, from 11 a.m. to 12:30 p.m. and from 2 p.m. to 3:30 p.m. EDT each day. Robert M. Koerner and George Koerner will teach the course. This is the first GSI […]
GSI’s Robert M. Koerner to host webinar on geotextile filters
June 23rd, 2018
The Geosynthetic Institute (GSI) will sponsor a webinar entitled "Geotextile Filters: Concerns and Issues," on July 11, 2018, from 11:30 a.m. to 1 p.m. EDT. The webinar will be hosted by Dr. Robert M. Koerner. This is the first GSI webinar for which all GMA member companies and their employees will receive discounted rates on webinar […]
Cirtex video spotlights geotextiles in coastline protection
June 21st, 2018
Cirtex, in Kopu, Thames, New Zealand, released a video on June 19, 2018, that showcases geotextiles used for filtration and erosion protection in coastline seawalls. Narrated by Cirtex civil and geotechnical engineer Michael Sorensen, the three-minute video takes the camera down below the boulders in seawalls to examine both properly specified geotextiles and improperly specified […]
Flowrox introduces all-in-one geotextile filtration and dewatering unit
June 18th, 2018
On June 11, 2018, Flowrox Oy, headquartered in Lappeenranta, Finland, launched the Flowrox Geobag™, an all-in-one roll-off geotextile filtration and dewatering unit that consists of Flowrox’s high-performance Packaged Pumping System™ and the company’s LPP-T transfer pump to ensure chemical dosing ability and high-performance pumping. The product is watertight with a drain valve that enables closed […]
WisDOT issues geosynthetics standards for roadways
January 18th, 2018
In December 2017, the Wisconsin Department of Transportation (WisDOT) released new standards for geosynthetics in roadways, part of WisDOT’s comprehensive Highway Construction Roadway Standards. The new standards include geotextiles for subgrade separation and stabilization, drainage, filtration, subgrade reinforcement, and under culverts and riprap, as well as geogrids for subgrade, marsh and slope stability reinforcement. To […]
Report from the North American Geosynthetics Society (NAGS)
April 1st, 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 […]