Here’s quite a pair: Geomembranes and butterflies

October 1, 2007  |  Products

New liner system installed in the Smithsonian’s Butterfly House Introduction This immersive exhibit explores the processes and patterns of evolution, and provides visitors with a new kind of experience in the National Museum of Natural History (NMNH)—a walk-through living butterfly house…
Geotextile for base stability

October 1, 2007  |  Products

From the GMA Techline Subject: Geotextile for base stability— I am a landscape architect and value your Geosynthetics publication in my practice. While reading the June/July issue [and the article on] roads and housing on wet soils, a current project challenge of mine came to light: How to bes…
Geotextile cushion design

October 1, 2007  |  Products

From the GMA Techline Subject: Geotextile cushion design— Using the geotextile cushion calculator on landfilldesign.com, and according to your research report, we should be using a factor of safety of 3 for cushion geotextile and the size of the protrusion height at half the height of the larg…
Geomembrane wrinkles during installation

October 1, 2007  |  Products

From the GMA Techline Subject: Geomembrane wrinkles during installation— What is the general state of practice for limiting wrinkles during geomembrane installation? What is the maximum wrinkle height that should be allowed? Should it be trapped straight up or allowed to fold over? Thanks. (Er…
Effects of temperature on geomembrane strength

October 1, 2007  |  Products

From the GMA Techline Subject: Effects of temperature on geomembrane strength— I am working on the design for some lined reservoirs where the liner may be exposed for some time during the summer, with the temperatures possibly approaching 120°F. We plan to use a 60-mil HDPE geomembrane. Gi…
Polymer question

October 1, 2007  |  Products

From the GMA Techline Subject: Polymer question— I would like to know if you can tell me which polymer is better to make nonwoven geotextiles, polyester or polypropylene? My problem is that I have to choose between two geotextiles with the same properties but with different polymers. (Ingrid, …
Landfill liner installation inspection

October 1, 2007  |  Products

From the GMA Techline Subject: Landfill liner installation inspection— I was hoping that maybe you would have information on training or certification on the inspection of installations of geomembrane liners for landfills. (Daniel, New York) Reply: We have the exact program you are looking for…
Gas diffusion coefficients

October 1, 2007  |  Products

From the GMA Techline Subject: Gas diffusion coefficients— I am in the process of evaluating the mass flux of a gas moving through a 30-mil PVC geomembrane. I am working with volatile organic compounds in soils. What I need are typical values based on unsaturated soil vapors. I have found info…
New resin for geomembranes

August 1, 2007  |  Products

Dow Chemical Co. has announced the commercial availability of a new HDPE (high-density polyethylene) resin for use in geomembranes, the synthetic materials commonly used as impermeable liners in geotechnical engineering applications for environmental protection, water collection and preservation, an…
Waterproofing job for Dubai tunnel

August 1, 2007  |  Products

The $3.3 million(U.S.) Jumeirah Vehicular Tunnel waterproofing project was completed in April. The 1,400m tunnel is the only link for vehicles between Jumeirah Palm Island and the crescent areas surrounding it at the spectacular palm island complexin Dubai. The waterproofing system, designed and exe…