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June 1, 2014

Deadline for 2014 International Achievement Awards (IAAs) is June 30 The deadline for entries in the 2014 International Achievement Awards, sponsored by the Industrial Fabrics Association International (IFAI), is fast approaching—June 30, 2014. For the 2014 IAAs, there are 31 categories, including “#28: Geosynthetic Projects”—and these award-winners will be featured in the February/March 2015 issue …

The influence of soil type on interface behavior under pullout conditions

Part 3: European experience in pullout tests By Nicola Moraci, Daniele Cazzuffi, Lidia Sarah Calvarano, Giuseppe Cardile, Domenico Gioffrè, and Piergiorgio Recalcati 1. Introduction The rapid increasing application of geosynthetics as reinforcement elements for earth structures requires a careful examination of soil-reinforcement interaction mechanisms. The soil-geosynthetic interaction can be complex because it is affected by …

Geonet structure, short-term stress/strain behavior, and creep test methods

Part 1: Allowable stress on geonets By Dhani Narejo and Sam Allen Introduction Several types of geonets are used in numerous applications worldwide. Examples of the types of geonets include biplanar, triplanar, spiked or profiled, cuspated, tubular, and three-dimensional (3-D) filament meshes (see Figure 1 and Table 1). Common and emerging applications for these materials …

An association for the geosynthetics industry

By Lucie Passus According to Merriam-Webster, an association is an organized group of people (or companies) that share a common interest. As GMA’s former managing director, Andrew Aho, wrote in his April 2013 GMA column in Geosynthetics on the history of GMA, this association was born out of a need to represent the interests of …

The importance of geosynthetic performance testing

Bob Koerner Most people would agree that the analysis of failures is important. The basic reasoning is that each such case history represents a situation where the designed factor-of-safety value has fallen below unity. Conversely, each case of nonfailure represents a factor-of-safety value of one or higher. How much higher is, of course, not known. …

Geosynthetics: The science that makes green roofs work

Green roofs 101: From bottom to top By Allan Wingfield 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 …

Geotextile tube coffer dam provides solution to hydroelectric project construction challenge

By Gerardo Marti Introduction South-central Chile is blessed with mountains, rivers, an abundance of rain, and usually a predictable annual snowmelt runoff. All of these natural environment and climate conditions allow for the inexpensive sustainable hydroelectric generation of electricity. With Chile’s burgeoning economy and its mining sector growth, the demand for electricity is increasing to …