ASPHALT COMPOSITION, PARTICULARLY FOR OBTAINING ASPHALT ROAD SURFACES, AND METHOD OF PRODUCING THIS COMPOSITION

摘要

Asphalt composition suitable for road surfaces comprising an asphaltic basis material and a modifier, the modifier comprising from 1 - 50% by weight of rubber thermal degradation products in a medium chosen from petroleum asphalts, mineral oil selective refining residues, kerosene heavy residues, or coal tar oil residues, the degradation of the rubber being effected by heating it at a temperature of from 240 - 380.degree.C in the chosen medium. These modified asphalts in addition to exhibiting the known good tyre adhesion and load resistance of rubberized asphalts, also exhibit better thermoplastic characteristics and improved adhesion to the substrate on which it is laid, for example road bed aggregate.