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.
Catalytic Process For Producing Free Radicals On Crumb Rubber
Ghulam M. Memon - Sterling VA Brian H. Chollar - Falls Church VA
Assignee:
The United States of America as represented by the Secretary of Transportation - Washington DC
International Classification:
C09D19500 C08F 806 C08F 3600
US Classification:
10628405
Abstract:
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.