1. Scope
1.1 This test method covers laboratory measurement of the hydraulic conductivity (also referred to as coefficient of permeability) of water-saturated tired derived aggregates (TDA) obtained from scrap tires using a rigid-wall permeameter. The tire materials covered in this method include tire chips, tire shreds, and tire derived aggregate (TDA) as described in Practice 6270 with particle sizes ranging from approximately 12 mm to 305 mm. There is no clear trend of reducing hydraulic conductivity with shred size at a given vertical stress for shreds 50 mm. Whole scrap tires are not included in this standard. A single or dual-ring permeameter is used in the tests. A dual ring permeameter may be preferred over a single ring permeameter to take into account and prevent short-circuiting of permeant along the sidewalls of the permeameter. 1.2 The test method is used under constant head conditions. 1.3 Water is used as the permeant with the test method. 1.4 Test Method D 2434 also can be used for determination of hydraulic conductivity of TDAs with sizes smaller than 19 mm under constant head conditions in a rigid-wall permeameter. Method D 2434 includes the use of a permeameter with a single ring. 1.5 The standard units for the hydraulic conductivity values are the SI units, unless other units are specified. Hydraulic conductivity has traditionally been expressed in cm/s in the U.S., even though the official SI unit for hydraulic conductivity is m/s. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Shredded scrap tires can be used as drainage medium. Hydraulic conductivity is required in various civil engineering applications of scrap tires as drainage material, e.g, in landfill leachate collection systems, drainage channels, etc. This standard may be adopted by government agencies, consulting firms, and landfill and earthwork companies.
Keywords
constant head; scrap tire; tire derived aggregate; hydraulic conductivity
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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