Performing geoelectric leak location or liner integrity surveys (LIS) is beneficial.
The first test using multiple interfaces was actually conducted in the bed of a dump truck in about 1985.
The logical criteria for specifying an action leakage rate (ALR) is not whether a certain rate is achievable with good construction practices, but whether there is a practical solution if the ALR is not achieved.
When I knew that Lyn and I were going to EuroGeo4 in Edinburgh (September 2008), we decided to take advantage of the cheap European airfares to spend a few vacation (What a concept!) days in Prague.
This article provides an overview of the research where the use of geocells as an earth-retention structure was explored.
The GRI–GM11 Test Method has now been superseded by ASTM D7238 and ours has been discontinued.
A technical note regarding interpretation of cohesion (or adhesion) and friction angle in direct shear tests.
ACH Foam Technologies announced in December the completion of a 15-year test to determine water absorption characteristics of EPS (expanded polystyrene) and XPS (extruded polystyrene).
A potential industry-wide concern for GCL shrinkage was identified by Thiel and Richardson (2005) at the January 2005 Geo-Frontiers conference in Austin, Texas, based on observed problems at several sites worldwide.
I know that for friction test of drainage material, it is correct to test GCDs according to ASTM D5321.
HDPE and PVC pipes and HDPE geomembranes are the most-resistant polymers to a wide range of leachates, and for this reason these materials are commonly used for landfill liner systems.
Plastic trash bags are, indeed, of the type of HDPE geomembranes from a resin perspective.
The testing was conducted at the Cocheco River in New Hampshire.
The shear strength of the 2 nonwovens against one another is in the neighborhood of 20-30° depending on the normal stress applied.
Federal agencies have resisted experimentation with geotextiles in critical applications and there have been minimal criteria governing use in federally funded water resource projects.
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.
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 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).
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).
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.