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Welding LLDPE/HDPE
April 1st, 2010
From the GMA Techline Subject: Welding LLDPE/HDPE How do you achieve a satisfactory extrusion weld between a 1mm LLDPE geomembrane and a 2mm HDPE geomembrane? What constitutes a satisfactory extrusion weld? (Niall, Ireland) Reply: You have two things going against you in your situation: thickness differences and material differences. Regarding the thickness situation, 1mm is […]
What do you want from your green roof?
April 1st, 2010
All green roofs include multiple underlayers of materials that, together, protect the building and provide the conditions for the top-layer plantings to thrive. Chief among these layers are geosynthetic materials required for separation, waterproofing, and drainage. This article includes selections from “Green roof design and installation” by Angie Durhman, Green Roof Program Manager at TectaAmerica, […]
Strong as silk: Using a bio-enabled approach to produce nanoparticle composites
April 1st, 2010
By John Toon Using thin films of silk as templates, researchers have incorporated inorganic nanoparticles that join with the silk to form strong and flexible composite structures that have unusual optical and mechanical properties. This bio-enabled, surface-mediated approach mimics the growth and assembly processes of natural materials, taking advantage of the ability of biomolecules to […]
Geotextile tubes are integral components for oil-pipe foundations, erosion control
April 1st, 2010
PEMEX marine facilities in Tabasco, Mexico. By Alfonso Solís, Amy Tang, and Zoe Lin Abstract In this project, geotextile tube technology is adopted as part of an integral solution for beach erosion problems at the Dos Bocas marine facilities for Petroleos Mexicanos (PEMEX). The solutions designed consisted of: geotextile tubes (GT) filled with sand working […]
New round-strand innovation in biplanar geonet structure
April 1st, 2010
An example of a solution to the problem of high-stress rollover for biplanar geonets. By Dhani Narejo and Mengjia Li Background The primary design property of drainage geocomposites is flow rate or transmissivity, which is measured in the laboratory according to ASTM D4716. The laboratory value is used to calculate the allowable flow rate according […]