Fabtech Australia replaces huge anaerobic lagoon geosynthetic cover

April 7th, 2021

Goulburn Valley Water in Australia has undertaken upgrade work to the 266-million-gallon (50-megaliter) High Rate Anaerobic Lagoon (HRAL) located at their Daldy Road, Shepparton, Victoria, waste management facility. The lagoon has an area of 538,196 square feet (50,000 m2). The upgrade work includes removing the existing cover, which has reached the end of its service […]

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ASCE president issues statement on American Jobs Plan proposal

April 1st, 2021

The American Society of Civil Engineers (ASCE) applauds President Joseph R. Biden’s American Jobs Plan, a truly historic proposal for modernizing and improving the nation’s infrastructure, said Jean-Louis Briaud, Ph.D., P.E., president, ASCE. The society urges Congress and the Biden Administration to now work together to develop a comprehensive, bipartisan infrastructure bill that will set […]

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Update from IGS-NA

April 1st, 2021

by John Allen The IGS North America (IGS-NA) board is working diligently on diversity within its membership and representatives. The organization is expanding the number of liaisons to the board to include all the major North American technical societies that influence geosynthetics. IGS-NA provides the best vehicle for disseminating research on geosynthetics, as it connects […]

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A new specification for geotextile grout filled mattresses

April 1st, 2021

By George R. Koerner FIGURE 1 GGFM being filled incrementally. Courtesy of HUESKER Geotextile grout filled mattresses (GGFM), also referred to (in ASTM D18.25/D35.05) as fabric-formed concrete (FFC) or fabric-formed concrete revetments (FFCR), are erosion-resistant concrete linings made from durable, permeable fabric forms that are filled with high-strength grout. GGFMs are generally sloping structures placed […]

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Comparative analysis of the flow and filtration capabilities of sediment retention devices—Part 2

April 1st, 2021

By James E. Sprague and C. Joel Sprague Sediment retention devices (SRDs) include silt fences, wattles, filter logs, compost socks and various types of stormwater inlet protectors. They are a widely used best management practice (BMP) to provide sediment filtration from stormwater runoff while allowing water passage. However, SRD performance varies greatly in flow rate […]

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Development of a new design method for geosynthetic-reinforced RPEs

April 1st, 2021

By Pietro Rimoldi and Nicola Brusa Rapid and extreme climate change is putting our planet under stress. As a consequence, in mountain and hilly regions, infrastructure and people are more often threatened by quick and unpredictable rockfall events. Falling boulders can have extremely high speeds, exceeding 11 mph (5 m/s) and up to 67 mph […]

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Concrete interlayers

April 1st, 2021

Q: We are interested in using a geotextile as an “unbonded concrete interlayer” over existing concrete pavement to float the new slab over deteriorated pavement, instead of a thin asphalt layer. Do you have any guidance for us in this regard? A: Over the past several years, 16-ounce-per-square-yard (542-g/m2) nonwoven needlepunched geotextiles have been used […]

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GRI-GM19 peel specification

April 1st, 2021

Q: Our liner system is a double composite and along a western tie-in. We need to extrusion-weld the secondary 60-mil (1.5-mm) HDPE (new cell) to an existing secondary 40-mil (1-mm) HDPE (old cell), and the state is continuing to have issues with the fact that we are using the 40-mil (1-mm) GRI-GM19 peel specification as […]

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Installing a geomembrane low to high gradient?

April 1st, 2021

Q: We are a large liner installation firm that has been asked to install a geomembrane liner from low gradient to high gradient. Is this the new normal? A: This is not normal, and we suggest you strongly object to this recommendation. There are many stakeholders in regard to panel layout (i.e., installer, general contractor, […]

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Geomembranes for reinforcement?

April 1st, 2021

Q: We are using Robert Koerner’s Designing with Geosynthetics to calculate the required thickness of a geomembrane. See Figure 1 and Equation 1 from the book for details. Figure 1 Equation 1 Can you point us in the right direction with the mobilization distance, x? A: Yes, please see Figure 2 for high-density polyethylene (HDPE). […]

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