October 2008 Issue

• 

  Thanks for the info on GRS technology

  The article by Michael Adams in the April/May 2008 issue of Geosynthetics, “The GRS bridges of Defiance County,” discusses an “easy as 1-2-3” solution for simple bridge construction.

• 

  FHWA icon retires

  Jerry DiMaggio, Federal Highway Administration principal bridge engineer/geotechnical, retired Oct. 3 after a 33-year career with the agency.

• Propex appoints Brant VP/COO

  Stan Brant has been named executive vice president and chief operating officer of Propex Inc. Worldwide.

• CETCO introduces new geosynthetic clay liner product

  The product combines the benefits of its needlepunched GCLs with the pricing of its adhesive GCLs, according to a company press release.

• Wisconsin city receives gift from Propex

  Lake Delton, Wis., has accepted donation of geosynthetic material that could help several of the city’s civil engineering projects.

• Thrace adds new nonwoven line

  Thrace-LINQ, a 100% subsidiary of The Thrace Group, has announced the investment of $20 million in new equipment at its Summerville, S.C. facility.

• New personnel at Profile

  Kurt Chirbas and Todd Lagerlof have joined Profile Products LLC.

• Genivar acquires Solmers

  The Genivar Income Fund has acquired Solmers Inc., a Quebec-based firm specializing in environmental engineering services, including waste-confinement technology.

• Shanghai proceedings available

  Geosynthetics in Civil and Environmental Engineering: Geosynthetics Asia 2008, Proceedings of the 4th Asian Regional Conference on Geosynthetics in Shanghai, China, is available in hardcover (November 2008).

• Synteen offers 17ft-wide material for all lines in 2009

  Synteen Technical Fabrics (STF) announced earlier this year an expansion of wide-width weaving capacity at its Lancaster, S.C. plant.

• 

  The Geosynthetic Institute Fellowship Program

  It was of great personal interest to look into Wikipedia® and learn that there are 1.6 million nonprofit organizations in the United States!

Back to Top

• 

  Under the green roof: Ground control in northern California

  Stabilizing a “living roof” with biodegradable geotextile: Interlocking plant trays help the new California Academy of Sciences building blend into hilly surroundings at San Francisco’s Golden Gate Park.

• 

  Researchers test sediment-scrubbing technology

  The testing was conducted at the Cocheco River in New Hampshire.

• Cheaper products

  If you are looking for a vendor other than the usual manufacturers of geotextile tubes and containers, I suspect you can contact other industrial fabrics manufacturers to get prices for a specific product.

• HDPE and PVC

  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.

• Seams on a sideslope

  The strategy is to stagger these seams from one roll end (about 30ft long) to the next so that they do not align with one another.

• Break/yield strengths

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

• Flash point

  The PVC geocomposite you speak of is a PVC geomembrane bonded to a needlepunched nonwoven geotextile.

• Landfill temperatures

  We are nowhere near 70°C (ca.160°F) at our monitoring, even for bioreactor landfills, and I haven’t even tried to project out to such values.

• HDPE question

  Plastic trash bags are, indeed, of the type of HDPE geomembranes from a resin perspective.

• Rub sheets

  I like a rub sheet between the pipe risers and the uppermost geomembrane, since any downdrag deformation will cause pipe deformation and not be transferred to the underlying geomembrane.

• Geomembrane costs

  Costs vary with the thickness of the geomembrane, the site location, and time of year.

• 

  How long will my liner last?

  What is the remaining service life of my HDPE geomembrane?

• Alkalinity

  There is no concern over using the HDPE (or PP) geogrids in high alkalinity environments.

• CETCO introduces new geosynthetic clay liner product

  The product combines the benefits of its needlepunched GCLs with the pricing of its adhesive GCLs, according to a company press release.

• Drainage geocomposite

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

Back to Top

• 

  Under the green roof: Ground control in northern California

  Stabilizing a “living roof” with biodegradable geotextile: Interlocking plant trays help the new California Academy of Sciences building blend into hilly surroundings at San Francisco’s Golden Gate Park.

• 

  Geosynthetics and the new I-35W Bridge

  Examples of the geosynthetic materials used on the I-35W project in Minneapolis.

• 

  Reviving the Wrigley Reservoir on Catalina Island

  A new liner, a floating cover, and a wildfire off the west coast of California on Catalina Island.

Back to Top

• 

  Researchers test sediment-scrubbing technology

  The testing was conducted at the Cocheco River in New Hampshire.

• HDPE and PVC

  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.

• HDPE question

  Plastic trash bags are, indeed, of the type of HDPE geomembranes from a resin perspective.

• Drainage geocomposite

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

• Shear strength

  The shear strength of the 2 nonwovens against one another is in the neighborhood of 20-30° depending on the normal stress applied.

• Break/yield strengths

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

• 

  How long will my liner last?

  What is the remaining service life of my HDPE geomembrane?

Back to Top

• HDPE and PVC

  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.

• Cheaper products

  If you are looking for a vendor other than the usual manufacturers of geotextile tubes and containers, I suspect you can contact other industrial fabrics manufacturers to get prices for a specific product.

• Break/yield strengths

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

• Seams on a sideslope

  The strategy is to stagger these seams from one roll end (about 30ft long) to the next so that they do not align with one another.

• Landfill temperatures

  We are nowhere near 70°C (ca.160°F) at our monitoring, even for bioreactor landfills, and I haven’t even tried to project out to such values.

• Teaching geosynthetics

  As the author of the only textbook on geosynthetics, I know from book orders which universities are teaching [geosynthetics] courses.

• Flash point

  The PVC geocomposite you speak of is a PVC geomembrane bonded to a needlepunched nonwoven geotextile.

• HDPE question

  Plastic trash bags are, indeed, of the type of HDPE geomembranes from a resin perspective.

• Drainage geocomposite

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

• Rub sheets

  I like a rub sheet between the pipe risers and the uppermost geomembrane, since any downdrag deformation will cause pipe deformation and not be transferred to the underlying geomembrane.

• Geomembrane costs

  Costs vary with the thickness of the geomembrane, the site location, and time of year.

• Shear strength

  The shear strength of the 2 nonwovens against one another is in the neighborhood of 20-30° depending on the normal stress applied.

Back to Top