|Three ASTM Standards Under Way Evaluate Geosynthetic Landfill Products
Since 1984, ASTM Committee D35 on Geosynthetics has developed standards for materials used in roadway stabilization/repair, erosion control, soil drainage/reinforcement, waste management, and more. In addition to its nearly 100 approved standards, the committee is proposing three new reference tools to evaluate products that line or cover landfills.
Specification for Geosynthetic Alternate Daily Covers
Currently on ballot at ASTM, this draft specification describes requirements for a variety of reusable and disposable geosynthetic alternate daily covers (ADCs) used on the working face of municipal solid-waste landfills.
The alternate daily cover is thin plastic sheeting thats left in place to keep down the odor, keep litter from blowing away, and keep birds from getting in. It also allows the landfill to take in more trash, says Gary M. Kolbasuk, Product Development engineer; Engineered Films Division, Raven Industries, Sioux Falls, S.D.
The proposed specification will help end users select ADCs sold in various forms, such as reinforced/unreinforced film, reinforced/unreinforced sheet, and coated/uncoated fabric.
In plastics for 25 years, Kolbasuk is leading a task group of Subcommittee D35.03 on Permeability and Filtration that is developing, through voluntary consensus, a set of standard requirements for ADCs. As they develop the requirements, the group of geotextile professionals from academia, manufacturing, and commercial laboratory testing welcomes participation from ADC producers and fabricators. Contact Kolbasuk at the address below.
Strip and Grab Tensile Tests for Reinforced Geomembranes
A task group of Subcommittee D35.10 on Geomembranes also led by Kolbasuk is developing a Standard Test Method for Strip Tensile Properties of Reinforced Geomembranes, and a Standard Test Method for Grab Tensile Properties of Reinforced Geomembranes.
Grab and strip tensile are index tests, Kolbasuk says. Geomembrane material is defined by the type of strength that it gets in a strip tensile, or by grabbing a one-inch (2.54 cm) strip and pulling it to measure how far it elongates before it breaks. That allows manufacturers a way of comparing different materials as well as its use as a quality control test, he says.
The test methods appear in ASTM D 751, Properties of Test Methods for Reinforced Rubber Products, which is a compilation of 20 or more tests containing several tensile tests. According to Kolbasuk, geosynthetics professionals have used the methods for about three decades. Since the test methods in D 751 are not written for geosynthetics, the task group is issuing separate methods with updated procedures and properties.
We wrote a separate strip tensile and separate grab tensile to have two numbers identifying each test and procedure to eliminate confusion in the specifying of procedures and properties, Kolbasuk says.
Contact Kolbasuk to participate in these activities, or for further technical information (phone: 605/331-0324). For ASTM meeting or membership details, contact Christi Sierk, manager, Technical Committee Operations, ASTM International (phone: 610/832-9737). Committee D35 meets Jan. 15-16, 2004, in Tampa, Fla. //
Copyright 2003, ASTM