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The United States of America as Represented by the Secretary of

Ghulam Mohammed Memon

Brian H Chollar

An improved asphalt having enhanced settling properties. The asphalt includes crumb rubber particles which have been treated to produce a greater number of carboxylic sites on the surface of the crumb rubber. These carboxylic sites interact with the functional groups in the asphalt, resulting in a homogeneous mixture having improved separation characteristics as well as the improved rheological properties due to the inclusion of the crumb rubber particles.

Crumb rubber modified asphalt with enhanced settling characteristics

Increasing the usable temperature range of asphalts that contain crumb rubber particles by treating the crumb rubber with hydrogen peroxide in the presence of a catalyst such as Fenton's reagent, dioxomolybdenum bis(acetylacetonate), cobalt salt, tall oil, p-toluene sulfonic acid (PTSA), and others.

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Sterling, VA, United States of America

Ghulam Mohammed Memon