Liner system

June 1, 2011  |  Products

GMA techline answers from Bob Koerner RE: Liner system I’m working on a project that will have a liner system as follows (from top to bottom): 12in. min.—chipped tires 3ft min.—recompacted mancos shale (max hydraulic conductivity 1×10-7cm/sec) Prepared subgrade Are there any i…
Read More
GT weight

June 1, 2011  |  Products

From the GMA Techline RE: GT weight Is there any rule governing the geotextiles determined by weight and specification set? Or can I confirm that the properties specified in the rules are only mechanical and hydraulic properties without regard to weight? (José | Mexico) Reply: You ask a very …
Read More
GT ageing

June 1, 2011  |  Products

From the GMA Techline RE: GT ageing I’ve been trying to track down the best references for ageing and degradation of geotextiles and found reference to ongoing research in this area. I’ve located the Valcros Dam references. Are there others that you could recommend? Also, do you know if …
Read More
GT seam strength

June 1, 2011  |  Products

From the GMA Techline RE: GT seam strength We are starting to see more specs requiring 90% retention of original strength for seam strength on geotextiles. Is this common in the industry? What is the standard retention value? And do these values change between monofilament, slit film, and nonwovens?…
Read More
Case histories of exposed geomembrane performance

June 1, 2011  |  Case Studies

Geomembrane performance: Lessons learned—Part 1 By Abigail Beck Introduction While intact, geomembrane lining systems provide excellent liquid containment. With good quality control, it is possible to install a geomembrane with few or no holes. However, geomembranes are exposed to a variety of…
Read More
‘Old-timer’ recalls the history of geomembrane interface strength tests (Part 3)

June 1, 2011  |  Features

By Allan J. Breitenbach, P.E. Editor’s note: Part 1 of Allan Breitenbach’s treatise recalling geomembrane testing in days of yore appeared in the February/March issue of Geosynthetics and continued with Part 2 in the April/May issue. This concluding section continues with descriptions of…
Read More
Sustainable development using geosynthetics: European perspectives

June 1, 2011  |  Case Studies

By Russell Jones and Neil Dixon This paper was originally presented at GRI-24, March 16, 2011, in Dallas, Texas, USA. It has been edited for Geosynthetics magazine style and format. The articles in this series encompass all types of geosynthetics and their applications viewed from the context of sus…
Read More
A Lake Tahoe bluff-restoration story

June 1, 2011  |  Case Studies

From eroded to elegant By James Chinchiolo Introduction This project took place on a scenic high-banked lakefront property in Rubicon, Calif., with a 60-ft-high unstable and badly eroded shoreline bluff facing (Photo 1, below). The site was originally owned by Scottish immigrant and journalist B.C. …
Read More
Accelerated flow testing of geosynthetic drains

June 1, 2011  |  Features

By Sam Allen Introduction Most planar geosynthetic drains consist of a polymeric core with or without a geotextile bonded to one or both sides. The core, whether used by itself or in association with a geotextile, forms the main fluid transmission medium. Synthetic cores used in North America typica…
Read More
Building bridges the geosynthetic way

June 1, 2011  |  News

That’s the headline in the lead article of the April issue in FHWA’s monthly publication, Focus. If you or your company is involved in the bridge building business, then read this article. Geosynthetics has been writing about GRS bridge-abutment engineering for almost five years now. &ld…
Read More