SYMPOSIA PAPER Published: 01 January 1992

The Determination of Bitumen and Recycled Tire Rubber Content on Rubberized Asphalt Road Mixtures


The improvement of road user comfort associated with environmental protection by waste disposal has been incentive to the modification of bituminous binders by incorporating powdered rubber recovered from used tires. The adhesive properties of rubber-bitumen binders make it possible to construct porous asphalt surfacings the advantages of which lie in easy drainage of surface water, resistance to skidding, flexibility at low temperatures, and reduced noise levels. The construction of such surfacings involves the introduction of powdered rubber into the bitumen, in a known proportion which must be controlled. It is also important to be able to determine the binder content of such mixtures while allowing for the presence of rubber. The procedure for the cold extraction of the bitumen and the separation of the insoluble constituents by centrifugation is modified to enable powdered rubber to be distinguished from aggregates. This separation is obtained by suspending the rubber in trichloroethylene and then filtrating.

Author Information

Ista, EJ
Belgian Road Research Centre, Brussels, Belgium
Choquet, FS
Belgian Road Research Centre, Brussels, Belgium
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Developed by Committee: D04
Pages: 224–234
DOI: 10.1520/STP17835S
ISBN-EB: 978-0-8031-5180-2
ISBN-13: 978-0-8031-1413-5