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ASPHALT-RUBBER: WHERE IT STANDS

P S Kandhal

Abstract

The article discusses the establishment of a digestion temperature and time for a specific combination of asphalt cement and crumb rubber to produce an acceptable asphalt-rubber binder. The asphalt-rubber blend should be used as soon as possible after the initial reaction, and when used in hot mix asphalt, the following temperatures have been used: 163 to 190 deg C for dense graded HMA, and 135 to 163 deg C for open graded HMA mixes. The McDonald Process and PlusRide processes are discussed, and new concepts regarding the following are noted: the generic dry process, chunk rubber asphalt concrete, and continuously blended asphalt rubber.

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Available abstract

Key concepts: Asphalt, Natural rubber, Crumb rubber, Asphalt pavement, Materials science, Composite material, Cement, Asphalt concrete