Future meetings / ASTM Committee D35 on Geosynthetics

October 1st, 2010

The American Society for Testing & Materials (ASTM) Committee D35 on Geosynthetics was formed in 1984. D35 meets twice each year, usually in January/February and in June, with about 60 members participating in 45 meetings during three days. The Committee currently has about 275 members and it has jurisdiction over more than 115 approved standards […]

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Test parameters

October 1st, 2010

From the GMA Techline RE: Test parameters Most of the tests based on ASTM geotextiles provide for conditions of temperature and specific humidity. Do these parameters greatly influence the test results if you change or vary? Thanks, (José | Mexico) Reply: I believe that all of the standard test methods require controlled temperature and humidity […]

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GRI GM13

October 1st, 2010

From the GMA Techline RE: GM13 We request you to kindly send us the GRI-approved grades for manufacturing HDPE geomembrane as per GM13. (Dilip | India) Reply: The GRI GM13 specification is a template of required properties for a manufacturer to meet or exceed. If your geomembrane does indeed meet the requirements, you can say […]

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Geo mat for reinforcement when needed

October 1st, 2010

From the GMA Techline RE: Reinforcement We have a dirt area at our recycling center that large trucks drive on and, during normal conditions, the soil is stable. However, problems arise after heavy rains and it becomes difficult for the trucks to drive on. So, we are looking for a “geo mat” that we can […]

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Availability of Hypalon

October 1st, 2010

From the GMA Techline RE: Hypalon I am looking for a chlorosulfonated polyethylene AD-007. We used to use Hypalon but we received a notice a few months ago that chlorosulfonated resin will no longer be produced. Can you help us to find some companies that produce and sell this type of membrane? (Jorge | Mexico) […]

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Green roof market growth: Opportunities and challenges

October 1st, 2010

By Dhani Narejo Introduction The forecast for the North American roofing market is an anticipated worth of $18 billion in 2014(1) with the most rapid gains expected in alternative roofing technologies, including green roofs. This is good news for the geosynthetics industry. While traditional roofs do not use any geosynthetics materials, green roofs use many. […]

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Cameron Airpark combines old and new technologies on its ‘streetways’

October 1st, 2010

By Ray Myers Background Cameron Airpark Estates, about 20 miles east of Sacramento, Calif., is a unique residential community and airport. In 1950, Larry Cameron, a former champion rodeo rider and successful auto dealership entrepreneur, envisioned a place where residents could play golf, swim in a lake, and even enjoy the benefit of their own […]

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Optimization of anchor trench design for solar evaporation ponds

October 1st, 2010

By Richard Thiel Abstract Ponds with exposed geomembranes on their sideslopes are susceptible to wind forces, which must be resisted by properly designed anchorages at the slope crest. The most common anchorage is an earth-filled anchor trench. This article describes improved methods used to optimize the anchor trench design to conserve material and minimize earthwork […]

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Examples of paradigm confusion in the June/July 2010 issue of Geosynthetics

October 1st, 2010

To the editor: “Magic” is an appropriate description where the two significant elements of very different properties are combined to produce a unique composite stronger than either element. Concrete and asphaltic concrete are two examples of “unique composites.” Unique composites exhibit behaviors that exceed the sum of the constituents and cannot be accurately modeled using […]

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Comment on the High Line

October 1st, 2010

Editor's Note: This article from August/September 2010 Geosynthetics prompted a reader’s comment about green roof thickness. Comment From: Al Barth Posted: Aug. 25, 2010 The article on the High Line says the green roof system is 25mm thick. This seems quite small to accomodate all the component layers. Should this read 25cm? Response From: Ron […]

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