35 Years of Asphalt-Rubber Use in Arizona



The state of Arizona in the United States has used a unique asphalt binder called asphalt rubber which contains a large percentage of crumb rubber from ground waste tires as an asphalt binder since 1971. This unique paving asphalt material is used to primarily reduce all types of cracking including reflective cracking, thermal cracking and fatigue cracking. Asphalt rubber can be applied as a chip seal coat or as a hot mix. The asphalt rubber chip seals and hot mixes have been used on state, city and county highways to increase the pavement service life in a cost effective manner. This paper reports on the long term history and performance of asphalt rubber with regard to reducing all forms of cracking, providing a surface with virtually no rutting, good skid resistance, little maintenance, smooth ride and less noise. In general, objective pavement performance measurements taken over a 35 year period all indicate that asphalt rubber is a very good durable surface wearing course material.

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