Geogrid-reinforced soil mat

June 1, 2007  |  Products

From the GMA Techline Subject: Geogrid-reinforced soil mat I am considering a geosynthetic-reinforced soil mat to be placed under a building structure with conventional footings. The purpose of the soil mat would be to limit differential settlement across the building footprint in event of seismical…
Geotextile fabric

June 1, 2007  |  Products

From the GMA Techline Subject: Geotextile fabric We are specifying geotextile fabric: between the soil media (in a raingarden) and the underlying stone that contains the underdrain pipe. between the sod and the underlying stone (water quality swale) that contains the underdrain pipe. the top, bottom…
AOS vs. EOS

June 1, 2007  |  Products

From the GMA Techline Subject: AOS or EOS? What is the difference between AOS (Apparent Opening Size) and EOS (Equivalent Opening Size)? (Larry, Louisiana) Reply: The real answer is: “Not much.” Now let me answer your question. The U.S. Army Corps of Engineers developed AOS in 19…
Geomembrane raincoat liners in the mining heap leach industry

April 1, 2007  |  Products

By Allan J. Breitenbach and Mark E. Smith Introduction Raincoat liner (RCL) terminology is used in the mining heap leach industry in reference to a temporary exposed geomembrane cover (EGC) that minimizes rain stormwater infiltration into the ore heap fill and diverts cover surface storm runoff to t…
English seaside resort to get Europe’s first artificial surf reef

April 1, 2007  |  Products

A project has started to create Europe’s first artificial surf reef on the south coast of England. Sand-filled geotextile bags will be submerged east of the Boscombe pier, intended to create waves up to 13 ft. high and double the number of good surfing days to more than 150 each year. The £1.4 mi…
Using structured geomembranes in final solid-waste landfill closure designs

February 1, 2007  |  Products

By Ronald K. Frobel, MSCE, P.E. Introduction Slope failures on final cover systems for solid-waste landfills have been well-documented during the past 20 years with many failures of note within the past three years. Sliding failures have occurred despite known geotechnical reasons for failures and k…
Junction-strength requirements for roadway design, construction

February 1, 2007  |  Products

By Barry R. Christopher Introduction Currently many engineers are confused about junction-strength requirements for geogrids used in roadway base reinforcement and subgrade stabilization applications, primarily because of commercialism of junction strength requirements. Some promotional efforts reco…
Membrane seams addressed in new ASTM standard

February 1, 2007  |  Products

The increased use of geomembranes as barrier materials to restrict liquid migration created a need for a test method to evaluate the quality of geomembrane seams produced by tape methods. ASTM International Committee D35 on Geosynthetics has met this need with the approval of the new standard D 7272…
Arizona road

October 1, 2006  |  Products

From the GMA Techline Subject: Arizona road I am a design engineer working on a road construction project in Arizona. The existing road is to be rebuilt, with 6 inches of asphalt concrete (AC) over about 12 inches of existing base. The city is concerned with groundwater and has instructed us not to …
New Firestone RPP geomembrane

October 1, 2006  |  Products

Firestone Specialty Products has introduced a reinforced polypropylene membrane—MultiLiner RPP Geomembrane—a flexible, heat-weldable, polyester-reinforced membrane, for installers seeking another option for industrial and municipal liners, floating covers, and water-conservation applicat…