April 2010 Issue

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  Strong as silk: Using a bio-enabled approach to produce nanoparticle composites

  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.

• Residents want geotextile tubes for beach protection

  Australian residents near the New South Wales mid-north coast area of Taree have very personal and vested interests in the Old Bar erosion issue.

• Announcing Geo-Frontiers 2011

  The Geo-Institute of ASCE, the Industrial Fabrics Association International (IFAI) and the Geosynthetic Materials Association (GMA), the North American Geosynthetics Society (NAGS) join forces to present Geo-Frontiers 2011 at the Sheraton Dallas Hotel.

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  Delaware students win 2010 GeoChallenge

  The team of civil engineering students from the University of Delaware emerged from a strong field to win the 5th annual GeoChallenge Student Competition Feb. 23, 2010.

• L.A. may require stormwater capture

  A proposed city ordinance would require residential and commercial developments in Los Angeles to capture and reuse runoff generated in rainstorms.

• Report from GMA's Lobby Days

  GMA members were in Washington, D.C., March 1-3 for the association’s semiannual Lobby Days.

• 23rd annual workshop's focus: 'Geosynthetic materials durability'

  A workshop on field and laboratory experiences of geosynthetic materials durability was held in conjunction with ASTM’s Committee D35 meeting in San Antonio, Texas on Jan. 29, 2010.

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• Optimum height for geotextile storage

  In the waste containment QA/QC technical guidance book by Daniel and Koerner (ASCE Press, 2007, ISBN 0-7844-0859-9), there is a section regarding geotextile storage at a field site.

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  Geotextile tubes are integral components for oil-pipe foundations, erosion control

  PEMEX marine facilities in Tabasco, Mexico.

• Testing HDPE geomembrane liners

  Testing a 30-mil HDPE liner to a pressure between 22-27psi with a maximum pressure drop of 4psi over 3 minutes.

• Welding LLDPE/HDPE

  How to achieve a satisfactory extrusion weld between a 1mm LLDPE geomembrane and a 2mm HDPE geomembrane.

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  New round-strand innovation in biplanar geonet structure

  An example of a solution to the problem of high-stress rollover for biplanar geonets.

• Geocell application

  The suitability of geocell as slope surface protection on acidic soil conditions.

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  Geotextile tubes are integral components for oil-pipe foundations, erosion control

  PEMEX marine facilities in Tabasco, Mexico.

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  What do you want from your green roof?

  What green roofs can do for you.

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• Welding LLDPE/HDPE

  How to achieve a satisfactory extrusion weld between a 1mm LLDPE geomembrane and a 2mm HDPE geomembrane.

• Testing HDPE geomembrane liners

  Testing a 30-mil HDPE liner to a pressure between 22-27psi with a maximum pressure drop of 4psi over 3 minutes.

• Veneer stability

  Veneer stability in moving earth upslope vs. downslope.

• Geocell application

  The suitability of geocell as slope surface protection on acidic soil conditions.

• Textured HDPE?

  While sand on smooth HDPE is at or slightly higher than 14 degrees, when you have drawdown of the water the hydrostatic forces are sure to bring the sand covering with it.

• Optimum height for geotextile storage

  In the waste containment QA/QC technical guidance book by Daniel and Koerner (ASCE Press, 2007, ISBN 0-7844-0859-9), there is a section regarding geotextile storage at a field site.

• Questions about GM/GCL composite liners

  Three questions and answers about GM/GCL composite liners.

• Difficult lining task

  This is going to be an extremely difficult job to accomplish with 2mm-thick HDPE liner.

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