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HDPE welding
October 7th, 2009
From the GMA Techline Subject: HDPE welding [We are] seeking information that would assist on welding 60-mil white HDPE above 104°F. We have successfully demonstrated in the past with destructive and nondestructive testing welds that would exceed project specifications. We are currently on a large project where the engineers are seeking more substance to our […]
CQA test frequency for geomembranes and geocomposites
October 7th, 2009
From the GMA Techline Subject: CQA test frequency for geomembranes and geocomposites I have comments from a state agency concerning CQA test frequencies and field tests conducted on geocomposites. The questions I have are: What are the typical frequencies used for CQA testing of geomembranes and geocomposites? What CQA tests are performed in the field […]
Geogrid reinforcing behind rigid concrete retaining walls
October 7th, 2009
From the GMA Techline Subject: Geogrid use behind rigid concrete walls I was wondering if you can provide some information or guidance regarding the use of geogrid reinforcing behind rigid concrete retaining walls. My main questions are: How much can the use of geogrid reduce the lateral earth pressures acting on the retaining wall? How […]
Geotextile mats are curbing threats of weed invader in Ireland
October 7th, 2009
A non-native weed is choking off some of best fishing lakes in Ireland and disturbing water supplies in the west of the country. Biodegradable geotextile mats are providing the solution to tackling one of the most serious problems affecting the Lough Corrib ecosystem in decades. The jute matting has been successful in trials conducted by […]
Geo at P.S. #1
October 7th, 2009
“Afterparty,” the installation by MOS Architects at P.S.1 Contemporary Art Center in Long Island City, N.Y., opened last June to much professional acclaim. The installation is part of the annual Young Architect’s Program run collaboratively with the Museum of Modern Art to explore new design directions. MOS’s design featured several wind chimneys made from aluminum […]
Welding help for the Guangzhou Metro
October 7th, 2009
A major urban rail project in southeast China uses new welders to get the job done on time. By Christophe von Arx Introduction Guangzhou, previously known as Canton, is a thriving city in the southeast of China with an estimated population of more than 10 million, with an estimated 15 million living in the entire […]
History, development, and future prospects for geosynthetics industries in China (Part 2 of 2)
October 7th, 2009
By Jingkui Chi Editor’s note: Part 1 of this 2-part series ran in the August/September issue of Geosynthetics. Following the Abstract, Part 2 concludes with sections 3 and 4 of this manuscript. Abstract This article presents an introduction to the development of China’s geosynthetic production, applications, testing, and research, and discusses the market supply and […]
Geocells: The early days with the Army Corps
October 7th, 2009
What many people may not know about the early development of the geocell cellular confinement system is that the material wasn’t always black. In fact, early testing of a “grid confinement” system included wax-coated craft paper; a plastic drainage pipe matrix fastened with staples; paper-thin, hexagon-shaped, glued-aluminum; low- and medium-density recycled materials; pure polyethylene without […]
The professor training courses for geosynthetics: 1994-1998
October 7th, 2009
By David J. Elton and David M. Shannon Introduction Fifteen years ago, the Professor Training Course for Geosynthetics began training U.S. professors to teach geosynthetics at the university level. This paper reviews how the course was conceived, funded and run, and examines the results. Origin The Professor Training Course for Geosynthetics was the brainchild of […]
Geosynthetics: Recalling the days of yore
October 7th, 2009
The history of geosynthetics has been richly documented by our scholars, researchers, writers, and manufacturers—to list but a handful of sources. Excerpts from these sources are offered here as a “look back.” Compiled and edited by Ron Bygness Magazine reports from the early ‘80s From: Industrial Fabric Products Review, July 1981 Geotextiles have revolutionized the […]