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Weld or sew?
June 1st, 2016
Questions and answers from the GMA Techline We have a liner contractor who would like to wedge-weld geotextile rather than sew it. The material is simply a cushion layer below the 40-mil geomembrane and the contractor is concerned the sewn seams will affect wedge welding of the above geomembrane. Do you have a recommendation on […]
Geosynthetics: The science that makes green roofs work
June 1st, 2016
Green roofs 101–From bottom to top Introduction Most green roofs use a variety of geosynthetic materials to support healthy and sustainable installations. Geosynthetics contribute in many ways to the operational success and long-term sustainability of green roof systems. Because they are lightweight, they reduce green roofs’ structural loading on buildings and also reduce the energy […]
We’re losing the battle
June 1st, 2016
The above title is not about military, political, or social issues; it is about the knowledge base of graduating students and other new employees entering the field of geosynthetics. In both situations (i.e., graduating students and other new employees), entry level men and women have little or no idea of the plethora of available geosynthetic […]
Strength test?
June 1st, 2016
Questions and answers from the GMA Techline Something that has always puzzled me while performing the CQA for liners is the strength test for a weld using the extrusion gun. I always thought that if the weld does not pass for elongation, that has more to do with the sheet than how well the weld […]
Environmental applications of geosynthetics in pipeline installations
June 1st, 2016
Geo + Pipeline 101 Geosynthetics often play an important role on the environmental side of pipeline installations. During construction, actions must be taken to protect water quality, stabilize soil, and prevent soil erosion. Pipeline right-of-ways traverse many different types of landscapes, passing through sensitive resource areas such as streams and wetlands. Geosynthetics are used in […]
GMA’s 2016 government relations program is in full swing
June 1st, 2016
March 2016 was a great month for GMA to ramp up its 2016 federal and state lobbying efforts. GMA members and I had the opportunity to meet with three federal agencies in Washington, D.C. These meetings allowed GMA to educate government officials about the benefits of geosynthetic materials and at the same time encouraging federal […]
Part 3: Field evaluation of the performance of unpaved roads incorporating geosynthetics—Implementation
June 1st, 2016
Introduction The mechanisms that govern unpaved road performance are complex, and accurate field evaluation of the performance of unpaved roads incorporating geosynthetics is not easy because it involves many influence factors. Interpretation of test data can be correct only if there is a good understanding of the mechanisms (which was the purpose of the Part […]
Three of the most difficult questions
June 1st, 2016
From the GMA Techline Q-and-A 1. Mold inside drainage layer? Q: Recently there has been a greater demand for sustainable projects in Southern California and I was glad to see published in Geosynthetics magazine “Geosynthetics: The science that makes green roofs work” (June/July 2014, Vol. 32, No. 3). I am curious if there are any […]
Reinforced soil slope design and construction
June 1st, 2016
Harold Court East Regional Service Center in Austin, Texas Introduction The Harold Court East Regional Service Center in Austin, Texas, is a city-owned multi-purpose facility used primarily for material storage. The erosion control and other issues at this site included: periodic movement of the embankments on the western and southern boundaries of this property. the […]
Teaching the kids the real world of machining and manufacturing up close
June 1st, 2016
We thought it would be a good idea to invite some students from El Dorado High School’s metal shop here in Placerville to come to our facility to have an opportunity to see the real world of metal machining and manufacturing. The great thing about a field trip through our facility in Placerville is that […]