|Highway Drainage Specialists Sought to Develop Geocomposites Specification
ASTM Committee D35 on Geosynthetics welcomes participation from government transportation engineers, consultants, independent test labs, and manufacturers as it develops a standard specification for geocomposite highway-edge drains and other high-flow products. These products are used in applications with flows greater than 15 gallons/minute/foot of height (1.86 litres/minute/centimetre of height).
The proposed standard will cover two types: cuspated or other open cores wrapped with a geotextile, and closed cores (flat pipe or multiple small pipe) wrapped in a geotextile.
These products have been shown to be very cost effective, when properly specified and installed, says Jim Goddard, chief engineer, Advanced Drainage Systems, Inc., Hilliard, Ohio. They have also been proven to increase pavement life. Having a comprehensive standard in place will help the user and specifier obtain the performance and quality needed in these applications.
Committee D35 on Geosynthetics has recently begun the development of material and product specifications, says Pat Picariello, director of ASTM Corporate Development. Their industry (roughly 20-plus years old) has finally matured to the point where specification development is a reality for their marketplace.
The failure of some geocomposite drainage products, installed according to individual manufacturers specifications, resulted in decreased use in some areas, Goddard says. Referencing a voluntary-consensus standard made by a large representation of users and producers can improve product performance through better installation. This initiative is an attempt to develop a standard that addresses past mistakes and includes products that can perform their intended function if reasonably installed based on the current ASTM D 6088 installation standard [Standard Practice for Installation of Geocomposite Pavement Drains], he says.
It is hoped that the standard will provide the user and specifier a minimum quality standard to assure good performance of these products, he concludes. In doing so, it will increase the use and acceptance of these designs, which have been shown to be highly effective when properly specified and installed. It should also increase the use of these materials by county engineers, developers, and others, who can not evaluate the claims of individual manufacturers and who rely on ASTM standards.
For further information, contact Jim Goddard, Advanced Drainage Systems, Inc., Hilliard, Ohio (phone: 614/538-5248). Committee D35 meets Jan. 15-17 in Albuquerque. For meeting or membership details, contact Maxine Topping, manager, Technical Committee Operations, ASTM International (phone: 610/832-9737). //
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