AOS vs. EOS

June 1, 2007  |  Geotextiles, News, Q&A: GMA Techline

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…
Geotextile specifications

October 1, 2006  |  Geotextiles, News, Q&A: GMA Techline

From the GMA Techline Subject: Definitions I am looking for information on geotextile specifications, specifically permittivity and permeability. Can you point me to a document? (John, New York) Reply: The specification that you want is AASHTO M288 that addresses various highway-related applications…
Filter bags for ditch checks

October 1, 2006  |  Geotextiles, Q&A: GMA Techline

From the GMA Techline Subject: Filter bags for ditch checks We are looking for a type of geotextile fabric to specify for filter bags for temporary ditch checks. What we are looking for is a type of geotextile fabric that allows some water flow, probably about the same size opening as an FF-type fab…
Waterproofing membrane liner for a salt storage building

October 1, 2006  |  Geomembranes, Q&A: GMA Techline

From the GMA Techline Subject: Waterproofing membrane liner for a salt storage building We are required to specify the above to be installed beneath an asphalt pavement floor of a proposed salt storage facility. What would be an appropriate product and specification for installation in accordance wi…
Arizona road

October 1, 2006  |  Geotextiles, Q&A: GMA Techline

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 …
Geotube questions

April 1, 2006  |  Q&A: GMA Techline

From the GMA Techline Subject: GeotubeI refer to the article “Saving Yucatan’s Coast” published in the September 2005 issue of GFR (now Geosynthetics), pages 34-39. Can you please let me know the following: What mathematical calculation was used to derive the appropriate ground lev…
Measuring puncture resistance

January 1, 1970  |  Q&A: GMA Techline

From the GMA Techline RE: Measuring puncture resistance How can I measure hydrostatic puncture resistance of a geomembrane in the field with different conditions (with or without geotextile)? [My company] uses geomembrane in agricultural pools. (Elham) Reply: The test you are looking for is ASTM D57…
Geotextile puncture resistance

January 1, 1970  |  Geomembranes, Q&A: GMA Techline

From the GMA Techline RE: Geotextile puncture resistance [I have] a question for you on geotextile puncture resistance. I was looking through your book to refresh my memory on the calculation procedure on geotextile puncture resistance, Section 2.5.4. I saw the scaling factors S2 and S3 and the exam…