Company News

Flowrox introduces all-in-one geotextile filtration and dewatering unit

June 18, 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 …

Industry News

GEOKON certified to ISO 9001:2015

June 14, 2018

GEOKON Inc., a manufacturer of geotechnical and structural instrumentation, announced in a prepared statement on June 13, 2018, that they have been certified under ISO 9001:2015 from both the American National Standards Institute (ANSI)/ANSI-ASQ National Accreditation Board (ANAB) in the U.S. and the United Kingdom Accreditation Service (UKAS) in the U.K. as of June 1, …

Resources

TRB releases report on resilience after natural disasters in transportation infrastructure

June 12, 2018

On June 11, 2018, the Transportation Research Board (TRB) National Cooperative Highway Research Program (NCHRP) released a prepublication, unedited version of “Synthesis 527: Resilience in Transportation Planning, Engineering, Management, Policy, and Administration” by Aimee Flannery, Maria A. Pena and Jessica Manns. The draft report documents resilience efforts and how they are organized, understood and implemented …

Events

GSI to host webinar on geotextile tubes

June 11, 2018

The Geosynthetic Institute (GSI) will sponsor a webinar entitled “Applications and Design of Geotextile Tubes,” on Wednesday, June 13, 2018, from 11:30 a.m. to 1 p.m. EDT. Geotextile tubes are large factory-fabricated textile tubes with multiple access ports for introduction of infilled material, which is usually dredged and in slurry form. After an overview, a …

Resources

Dr. Robert M. Koerner answers your geosynthetics questions

June 5, 2018

Get your technical geosynthetics questions answered by one of the world’s leading experts on geosynthetics through the GMA Techline. View past questions and answers at https://tinyurl.com/GMATechline. Email gmatechline@ifai.com anytime for fast, direct answers to any and all technical geosynthetics questions. This one-of-a-kind resource is free to all courtesy of the Geosynthetic Materials Association (GMA), Geosynthetics magazine and the …

Awards

DFI Educational Trust awards scholarships to engineering students

June 5, 2018

The Deep Foundations Institute (DFI) Educational Trust recently awarded several scholarships to civil engineering students focusing on geotechnical and/or environmental engineering at the University of Illinois at Urbana-Champaign, DFI said in a June 5, 2015, press release. The 2018 recipients of the Charles J. Berkel Memorial Scholarship were University of Illinois students Elisabeth Tarpey, Jessica …

GSI News

Geosynthetic Institute news: On the estimation of live loads in MSE walls and slope design

June 1, 2018

In formulating a factor-of-safety value for a mechanically stabilized earth (MSE) wall or slope project, a design engineer calculates a ratio of resisting forces to driving forces. This contrast is further recognized when using load and resistance factor design (LRFD), which is in our not-too-distant future. The resisting forces are the soil’s inherent properties (e.g., …

GMA News

GMA News: GMA had a jam-packed start to the year

June 1, 2018

In January 2018 members of the Geosynthetic Materials Association (GMA) participated in the Transportation Research Board (TRB) Annual Meeting in Washington, D.C. In February our executive council met in Charlotte, North Carolina, to review GMA’s goals and mission. In March a delegation of GMA executives met with representatives from the White House and the U.S. …

News

GeoDallas Watch: 2018 GeoDallas schedule announced

June 1, 2018

June World Environmental & Water Resources Congress June 3–7 | Minneapolis, Minn. Hosted by the Environmental & Water Resources Institute (EWRI) of the American Society of Civil Engineers (ASCE), the World Environmental & Water Resources Congress brings together the top environmental and water resources infrastructure professionals. Topics include erosion and sediment control, numerical modeling, hydraulic …

News

Presto releases geocell ballast research

June 1, 2018

Presto Geosystems, manufacturer of the high-density polyurethane (HDPE) GEOWEB® geocell base stabilization system, has released results from 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, and …

Feature

Monitoring the performance of Louisiana’s first GRS–IBS bridge

June 1, 2018

Over the decades, soil mass reinforced by layers of geosynthetics has been used widely and successfully in a variety of earth structures, such as mechanically stabilized earth (MSE) retaining walls, embankments, slopes and shallow foundations. Due to the proven benefits of geosynthetic reinforced soil (GRS), including cost-effectiveness, simple and fast construction, and tolerance of differential …

Feature

Springtime failure of a cold-climate geotextile riprap slope

June 1, 2018

Geotextiles play an essential role in geotechnical projects. A significant use for geotextiles is as a separator and filter in drainage and erosion control applications (Holtz 2002). A temporary erosion control application geotextile, such as silt fencing, is used to prevent soil erosion by containing the soil and turbid water in a onetime operation. For …

Feature

Highway deep-patch geogrid applications

June 1, 2018

Deep patch is a repair technique that has been widely used on low-volume roads in the Pacific Northwest as a cost-effective mitigation technique to address settlement and shallow landsliding of side-cast embankment fill slopes and natural slopes consisting of weak soils overlying stronger soils (Cuelho et al. 2012). A deep patch consists of a subexcavation …

Erosion Control

GSI hosts webinar on MSE structure inspection

April 25, 2018

The Geosynthetic Institute (GSI) will sponsor a webinar entitled “Mechanically Stabilized Earth (MSE) Wall, Berm and Slope Construction Inspection,” on May 9, 2018, from 11:30 a.m. to 1 p.m. EDT. The inspection and monitoring of MSE wall, berm and slope construction using geosynthetic reinforcement is essential for providing a safe, durable system. Such inspection includes …

Erosion Control

2019 IECA Annual Conference issues call for abstracts

April 24, 2018

The International Erosion Control Association (IECA) is now accepting abstracts for the IECA Annual Conference, Feb. 19–22, 2019, in Denver, Colorado, the association said in an April 20, 2018, press release. IECA said it is accepting abstracts for sessions including case studies, technical papers, workshops, industry roundtables, fireside chats, Mountain States-related sessions, posters, product case …

Industry News

FHWA accepting grant applications for advanced transportation technologies

April 23, 2018

The U.S. Department of Transportation’s Federal Highway Administration (FHWA) announced April 18, 2018, it is accepting applications for grants from a pool of up to $60 million in federal funding under the 2015 Fixing America’s Surface Transportation (FAST) Act. The grants will be made to eligible entities to develop model deployment sites for large-scale installation …

Feature Members only content

A next-gen basin liner solution for the U.S. Army Corps of Engineers

April 1, 2018

There are more than 100,000 miles (> 160,000 km) of levees throughout the United States, protecting lives and property from extreme weather-related flooding. Aging infrastructure and increasingly stronger storms have intensified the need to reinforce and protect levees, and emergency responders need solutions to repair a breached levee before it results in catastrophic damage. Therefore, …

Feature Members only content

Bituminous geomembranes on a French dam

April 1, 2018

La Galaube Dam, an International Commission on Large Dams (ICOLD) facility in the south of France, completes the hydraulic system of the Montagne Noire area and provides a total water storage capacity in excess of 283 million cubic feet (8 million m3). To supply potable water to three counties and 185 municipalities in the region, …

Feature Members only content

Reviving the Palos Verdes Reservoir—Part 2

April 1, 2018

The October/November 2016 issue of Geosynthetics published Part 1 of this series on revitalizing the Palos Verdes Reservoir in Los Angeles County, California. That article described the approach to revitalizing the site, as well as the five-month-long geosynthetic manufacturing and fabrication phase. In Part 2, we continue to explore more of the inner workings for …

Feature Members only content

Controlling uplifting gas bubbles in exposed geomembrane-lined ponds—Part 3

April 1, 2018

Part 1 of this series (Thiel 2017) demonstrated how the size, shape, pressure, and stresses and strains experienced by geomembrane bubbles inflated with gas could be analytically estimated. Part 2 of this series (Thiel 2018) evaluated the considerations for incorporating a gas-venting underdrain below the geomembrane liner. The current, and final, Part 3 of this …

Feature Members only content

GMA Techline

February 1, 2018

Determining quantity of recycled HDPE in a geonet Q: I have a question about high-density polyethylene (HDPE) geonets. Is it possible, by thermogravimetric analysis (TGA) and differential scanning calorimeter (DSC) analysis, to determine the quantity of recycled HDPE present in a geonet? I have a geonet that, I think, is made with virgin and recycled …

Feature Members only content

GMA Techline

October 1, 2017

Welding HDPE to PVC and more Q: I would appreciate any input you have on these questions: Can a high-density polyethylene (HDPE) geomembrane (GM) be welded to a PVC geomembrane? I am looking to connect a geomembrane to a building foundation. Based on some research, I have found the following options: bolt the geomembrane to …

Feature Members only content

GMA Techline

August 1, 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 …

GMA Techline Members only content

Questions and answers from the GMA Techline

February 1, 2017

Spraying? Shear Strength? Hydraulics? [A more] non-permeable GT? Q: I have received an inquiry for a non-permeable geotextile, which is UV-resistant and will be installed on a long slope for erosion control. Could you kindly recommend a product that would meet these requirements or a solution for this application? Your assistance with this is much …

GMA Techline Members only content

Questions and answers from the GMA Techline

August 1, 2016

Geosynthetic filter failure Q: I am interested in your upcoming webinar on geosynthetic filters and was hoping to get a little clarification on the content. I’m most interested in how geotextile fabrics are used with riprap but I also understand these fabrics are perhaps more commonly associated with roadway construction. How much does this webinar …

GMA Techline Members only content

Recycled materials reinforcement?

June 1, 2016

Questions and answers from the GMA Techline We are soliciting information on the use of recycled materials in the reinforced zone of MSE walls. I recall you as the keeper of many case histories. Do you have any success or failure stories about such recycled content in a reinforced zone? I’m mindful of chemical attack …

GMA Techline Members only content

Weld or sew?

June 1, 2016

Questions and answers from the GMA Techline We have a liner contractor who would like to wedge-weld geotextile rather than sew it. The material is simply a cushion layer below the 40-mil geomembrane and the contractor is concerned the sewn seams will affect wedge welding of the above geomembrane. Do you have a recommendation on …

GMA Techline Members only content

Strength test?

June 1, 2016

Questions and answers from the GMA Techline Something that has always puzzled me while performing the CQA for liners is the strength test for a weld using the extrusion gun. I always thought that if the weld does not pass for elongation, that has more to do with the sheet than how well the weld …

GMA Techline Members only content

Three of the most difficult questions

June 1, 2016

From the GMA Techline Q-and-A 1. Mold inside drainage layer? Q: Recently there has been a greater demand for sustainable projects in Southern California and I was glad to see published in Geosynthetics magazine “Geosynthetics: The science that makes green roofs work” (June/July 2014, Vol. 32, No. 3). I am curious if there are any …

GMA Techline Members only content

Lining of soil embankment?

June 1, 2016

Questions and answers from the GMA Techline I have a question concerning lining systems in embankment dams and want to ask for your advice (from your experience only, no need for any calculations). There is a wastewater reservoir built of clay, with a single HDPE geomembrane on top of the clay (i.e., a kind of …

Company News

Flowrox introduces all-in-one geotextile filtration and dewatering unit

June 18, 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 …

Industry News

GEOKON certified to ISO 9001:2015

June 14, 2018

GEOKON Inc., a manufacturer of geotechnical and structural instrumentation, announced in a prepared statement on June 13, 2018, that they have been certified under ISO 9001:2015 from both the American National Standards Institute (ANSI)/ANSI-ASQ National Accreditation Board (ANAB) in the U.S. and the United Kingdom Accreditation Service (UKAS) in the U.K. as of June 1, …

Events

GSI to host webinar on geotextile tubes

June 11, 2018

The Geosynthetic Institute (GSI) will sponsor a webinar entitled “Applications and Design of Geotextile Tubes,” on Wednesday, June 13, 2018, from 11:30 a.m. to 1 p.m. EDT. Geotextile tubes are large factory-fabricated textile tubes with multiple access ports for introduction of infilled material, which is usually dredged and in slurry form. After an overview, a …

Awards

DFI Educational Trust awards scholarships to engineering students

June 5, 2018

The Deep Foundations Institute (DFI) Educational Trust recently awarded several scholarships to civil engineering students focusing on geotechnical and/or environmental engineering at the University of Illinois at Urbana-Champaign, DFI said in a June 5, 2015, press release. The 2018 recipients of the Charles J. Berkel Memorial Scholarship were University of Illinois students Elisabeth Tarpey, Jessica …

GMA News

GMA News: GMA had a jam-packed start to the year

June 1, 2018

In January 2018 members of the Geosynthetic Materials Association (GMA) participated in the Transportation Research Board (TRB) Annual Meeting in Washington, D.C. In February our executive council met in Charlotte, North Carolina, to review GMA’s goals and mission. In March a delegation of GMA executives met with representatives from the White House and the U.S. …

GSI News

Geosynthetic Institute news: On the estimation of live loads in MSE walls and slope design

June 1, 2018

In formulating a factor-of-safety value for a mechanically stabilized earth (MSE) wall or slope project, a design engineer calculates a ratio of resisting forces to driving forces. This contrast is further recognized when using load and resistance factor design (LRFD), which is in our not-too-distant future. The resisting forces are the soil’s inherent properties (e.g., …

News

GeoDallas Watch: 2018 GeoDallas schedule announced

June 1, 2018

June World Environmental & Water Resources Congress June 3–7 | Minneapolis, Minn. Hosted by the Environmental & Water Resources Institute (EWRI) of the American Society of Civil Engineers (ASCE), the World Environmental & Water Resources Congress brings together the top environmental and water resources infrastructure professionals. Topics include erosion and sediment control, numerical modeling, hydraulic …

News

Presto releases geocell ballast research

June 1, 2018

Presto Geosystems, manufacturer of the high-density polyurethane (HDPE) GEOWEB® geocell base stabilization system, has released results from 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, and …

Panorama

Geogrid study initiative wins Center for Transportation Research Award

June 1, 2018

The University of Minnesota Center for Transportation Studies (CTS) selected Tensar International and its research partners as the winners of the 2018 CTS Research Partnership Award for their work on geogrid usage in paved-road infrastructure. The award recognizes a new pavement design and analysis tool, which enables geogrid benefits to be quantified using an aggregate-geogrid …

Panorama

WisDOT publishes study on geotextile puncture test methods

June 1, 2018

The Wisconsin Department of Transportation (WisDOT) and the Federal Highway Administration (FHWA) funded research into puncture test methods for geotextiles, and the report from this study is now available online. Various tests are conducted to assess and classify a geotextile’s suitability for different applications. One of these tests is the puncture strength test. This test …

Industry News

GEOKON certified to ISO 9001:2015

June 14, 2018

GEOKON Inc., a manufacturer of geotechnical and structural instrumentation, announced in a prepared statement on June 13, 2018, that they have been certified under ISO 9001:2015 from both the American National Standards Institute (ANSI)/ANSI-ASQ National Accreditation Board (ANAB) in the U.S. and the United Kingdom Accreditation Service (UKAS) in the U.K. as of June 1, …

Resources

TRB releases report on resilience after natural disasters in transportation infrastructure

June 12, 2018

On June 11, 2018, the Transportation Research Board (TRB) National Cooperative Highway Research Program (NCHRP) released a prepublication, unedited version of “Synthesis 527: Resilience in Transportation Planning, Engineering, Management, Policy, and Administration” by Aimee Flannery, Maria A. Pena and Jessica Manns. The draft report documents resilience efforts and how they are organized, understood and implemented …

Resources

Dr. Robert M. Koerner answers your geosynthetics questions

June 5, 2018

Get your technical geosynthetics questions answered by one of the world’s leading experts on geosynthetics through the GMA Techline. View past questions and answers at https://tinyurl.com/GMATechline. Email gmatechline@ifai.com anytime for fast, direct answers to any and all technical geosynthetics questions. This one-of-a-kind resource is free to all courtesy of the Geosynthetic Materials Association (GMA), Geosynthetics magazine and the …

GMA News

GMA and FGI to host part 2 of a webinar on the stability of geosynthetic lined slopes

May 15, 2018

The Geosynthetic Materials Association (GMA), in collaboration with the Fabricated Geomembrane Institute (FGI), will present the second of this two-part, free webinar series on May 31, 2018, at 12:00 p.m. EDT. The webinar will discuss the importance of geosynthetic interface strengths on slope stability, when to use peak and residual geosynthetic interface strengths, how to …

Industry News

USDOT launches BUILD Transportation program and announces $1.5 billion Notice of Funding Opportunity

April 30, 2018

The U.S. Department of Transportation (USDOT) on April 25, 2018, published a Notice of Funding Opportunity (NOFO) to apply for $1.5 billion in discretionary grant funding through the Better Utilizing Investments to Leverage Development (BUILD) Transportation Discretionary Grants program. USDOT said, BUILD Transportation grants replace the preexisting Transportation Investment Generating Economic Recovery (TIGER) grant program. …

Events

NHI hosting course on earth retaining structures in New Mexico and California

April 30, 2018

The Federal Highway Administration (FHWA) National Highway Institute (NHI) will host a three-day instructor-led course on earth retaining structures twice this summer, in Sacramento, California, and Santa Fe, New Mexico. The course (Course Number FHWA-NHI-132036) will provide state-of-the-practice design tools and construction techniques to expand implementation of safe and cost-effective earth retention technologies, NHI said. …

Feature Members only content

GMA Techline

February 1, 2018

Determining quantity of recycled HDPE in a geonet Q: I have a question about high-density polyethylene (HDPE) geonets. Is it possible, by thermogravimetric analysis (TGA) and differential scanning calorimeter (DSC) analysis, to determine the quantity of recycled HDPE present in a geonet? I have a geonet that, I think, is made with virgin and recycled …

Feature Members only content

GMA Techline

October 1, 2017

Welding HDPE to PVC and more Q: I would appreciate any input you have on these questions: Can a high-density polyethylene (HDPE) geomembrane (GM) be welded to a PVC geomembrane? I am looking to connect a geomembrane to a building foundation. Based on some research, I have found the following options: bolt the geomembrane to …

Feature Members only content

GMA Techline

August 1, 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 …

GMA Techline Members only content

Questions and answers from the GMA Techline

February 1, 2017

Spraying? Shear Strength? Hydraulics? [A more] non-permeable GT? Q: I have received an inquiry for a non-permeable geotextile, which is UV-resistant and will be installed on a long slope for erosion control. Could you kindly recommend a product that would meet these requirements or a solution for this application? Your assistance with this is much …