October 2007 Issue

• ASTM geosynthetics committees developing proposed new standards

  Three subcommittees of ASTM International Committee D35 on Geosynthetics are currently developing several proposed new standards.

• Industry analysts offer plastics predictions for the Middle East

  With relatively inexpensive raw materials at hand, manufacturers in the Middle East could place themselves among the world’s leading plastics producers within a few years, according to industry analysts.

• Now is the time

  It is easy to sit on the sidelines and complain that the industry has stagnated, that some all-encompassing, ambiguous organization should do a better job of growing our industry, or my industry association does not care about me.

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• 

  Three challenges in using SRWs and other reinforced-soil structures: Part 1

  How to contract for MSE walls.

• Geotextile for base stability

  Geotextiles are regularly used to provide separation, stabilization, and/or reinforcement to paved surfaces such as asphalt on a stone base course, as in a tennis court.

• Geotextile cushion design

  The extension from the truncated cones that were used to real soils/gravels are best-estimate values.

• Geotextile compatibility

  To my knowledge, polypropylene is extremely resistant to the entire range of pH-values, from acidic to alkaline.

• Polymer question

  Technically, each polymer has advantages and disadvantages.

• 

  Here's quite a pair: Geomembranes and butterflies

  New liner system installed in the Smithsonian’s Butterfly House in Washington, D.C.

• Geomembrane wrinkles during installation

  Years ago, I thought that small wrinkles would flatten out when overburden was applied. Unfortunately, they do not.

• Effects of temperature on geomembrane strength

  There have been undocumented studies on the temperature dependence of HDPE GMs insofar as their stress vs. strain response is concerned.

• Landfill liner installation inspection

  We have the exact program you are looking for.

• Gas diffusion coefficients

  Henry Haxo of Metrocon evaluated solvent vapor diffusion—as opposed to water vapor diffusion— many years ago.

• 

  Geogrid-reinforced roads aid wind farm's installation of giant turbines

  Development of the Maple Ridge Wind Farm near Lowville in upstate New York required stability improvement to the subgrade of 26 miles of access roads to the locations of the farm’s wind turbines.

• 

  Testing produces design guidance

  Follow this new anti-scour mat product through the testing process.

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• 

  Geogrid-reinforced roads aid wind farm's installation of giant turbines

  Development of the Maple Ridge Wind Farm near Lowville in upstate New York required stability improvement to the subgrade of 26 miles of access roads to the locations of the farm’s wind turbines.

• 

  Three challenges in using SRWs and other reinforced-soil structures: Part 1

  How to contract for MSE walls.

• 

  New PU composite expected to extend German North Sea defenses

  The next step in a 3,000m² extension of a North Sea shoreline erosion-control effort on islands off the northwestern coast of Germany included the installation of a new polyurethane-mixture coating.

• 

  Using geosynthetics for avalanche protection in northern Iceland

  One of the northernmost towns in Iceland, while picturesque, sits at the base of avalanche-prone mountainsides.

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• 

  Testing produces design guidance

  Follow this new anti-scour mat product through the testing process.

• Geotextile compatibility

  To my knowledge, polypropylene is extremely resistant to the entire range of pH-values, from acidic to alkaline.

• ASTM geosynthetics committees developing proposed new standards

  Three subcommittees of ASTM International Committee D35 on Geosynthetics are currently developing several proposed new standards.

Back to Top

• Geotextile for base stability

  Geotextiles are regularly used to provide separation, stabilization, and/or reinforcement to paved surfaces such as asphalt on a stone base course, as in a tennis court.

• Geotextile cushion design

  The extension from the truncated cones that were used to real soils/gravels are best-estimate values.

• Geomembrane wrinkles during installation

  Years ago, I thought that small wrinkles would flatten out when overburden was applied. Unfortunately, they do not.

• Access roads on HDPE liners

  I recommended 600-900mm thickness based on heavy waste transfer trucks going into the landfill and the dynamic loads that they impose.

• Effects of temperature on geomembrane strength

  There have been undocumented studies on the temperature dependence of HDPE GMs insofar as their stress vs. strain response is concerned.

• Geotextile compatibility

  To my knowledge, polypropylene is extremely resistant to the entire range of pH-values, from acidic to alkaline.

• Polymer question

  Technically, each polymer has advantages and disadvantages.

• Landfill liner installation inspection

  We have the exact program you are looking for.

• HDPE welds

  The concern is that the additional heating by the extrusion welding would decrease the molecular weight and have a degrading effect on the material at this sensitive location.

• Gas diffusion coefficients

  Henry Haxo of Metrocon evaluated solvent vapor diffusion—as opposed to water vapor diffusion— many years ago.

Back to Top