Specifications

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  • HDPE & LLDPE rates

    June 1, 2011

    The elongation rate for HDPE should be 2.0ipm and for LLDPE it should be 20.0ipm.

  • GG3-87

    October 1, 2010

    The replacement for the former GRI-GG3 Standard on Creep Evaluation is now ASTM D5262.

  • GRI GM13

    October 1, 2010

    GRI GM13 is a template of required properties for a manufacturer to meet or exceed.

  • ASTM standards for material properties for pavement components

    July 1, 2010

    Standards will help develop a mechanistic-empirical design guide for pavements.

  • Updating specs: ASTM D4833 replaced by D6241

    February 1, 2010

    Neither Mullen Burst Strength ASTM D3786 nor Puncture Strength ASTM D4833 is recognized by ASTM Committee D35 on geosynthetics as an acceptable geotextile test method.

  • GSI/GRI-GG5 and ASTM D6706

    October 7, 2009

    GRI–GG5 was the original test method on the subject but, subsequently, ASTM provided its own.

  • The difference between strength parameters

    June 1, 2009

    Discussing the differences between c and ø, and a and δ.

  • Comparing specs

    April 1, 2009

    The two groups, ASTM and ISO, act independently from one another although ASTM does have liaison people attending the ISO meetings as observers.

  • New ASTM standard for EPDM sheet material

    February 1, 2009

    The standard fills a need for an internationally recognized standard to ensure that EPDM sheet material received by customers is consistent regardless of the manufacturer.

  • Break/yield strengths

    October 1, 2008

    The break strength being lower than the yield strength in all 3 of these textured geomembrane specifications is correct.

  • Drainage geocomposite

    October 1, 2008

    I know that for friction test of drainage material, it is correct to test GCDs according to ASTM D5321.

  • Figure 3 | Stress crack initiated by extruder die line at stone protrusion.

    How long will my liner last?

    October 1, 2008

    What is the remaining service life of my HDPE geomembrane?

  • Placement of a temporary work platform for a seismic remediation project. Geotextile was used as a filter between the sand fill and riprap. Work platform and geotextile are removed at the end of construction. Photo courtesy U.S. Army Corps of Engineers.

    Geotextiles in dams: Forging federal guidelines

    August 1, 2008

    Federal agencies have resisted experimentation with geotextiles in critical applications and there have been minimal criteria governing use in federally funded water resource projects.

  • Figure 4 | Sliding of geomembrane and sand drainage layer during construction. Figure courtesy of RSG & Associates Inc.

    Active LFG control: An unreliable aid to veneer stability

    June 1, 2008

    The potential for sliding failure of final covers and piggyback liners in municipal solid waste (MSW) landfills equipped with active landfill gas (LFG) control systems is demonstrated and the need for a contingency passive venting system is presented.

  • Celebrating a decade of GSI/GRI polyolefin specs

    June 1, 2008

    From the very beginning of the GSI/ GRI consortium in 1986, it was recognized that specific focus groups were the way to initiate individual programs and documents.

  • Geosynthetics Market Report

    Sponsored by Geosynthetic Materials Association

    The most comprehensive and accurate measure of the geosynthetics market in the U. S. and Canada is now available from GMA. Here are some highlights.

    Geosynthetics manufacturing

    The Geosynthetics Market Report notes that there are currently 40+ geosynthetics manufacturing companies in the U.S. and Canada, with more than 50% located in southeastern part of the U.S. and Texas. There are more than 12,000 U.S. jobs in geosynthetics manufacturing, distribution, fabrication and installation.

    Sales

    Sales of geosynthetic materials are generally through distribution networks. Some distributors are exclusive or “captive” to one manufacturer, but most are not. Some manufacturers may sell directly to some project owners (usually when very large quantities are involved).

    Industry support

    Nearly all installers of geosynthetic materials in the U.S. and Canada are trained and certified, many through IAGI (International Association of Geosynthetics Installers).

    The geosynthetics industry is supported by testing companies that can verify the specifications of geosynthetic materials. And the industry is further supported by a large and active network of engineering consultants and also many academics (professors).

    Statistics

    • In 2007, U.S. geosynthetics sales totaled $1.89 billion.
    • Geosynthetic materials represent ~0.33% of U.S. transportation spending.
    • Knowledgeable estimates project that amount has the potential utilization.

    This report, copyright 2009, quantifies the production of geotextiles, geogrids, geomembranes, and drainage composites manufactured in the U.S. and Canada, and also includes a directory of manufacturers. Purchase this report at GMA Geosynthetics Market Report.