IMPROVEMENT OF PHYSICAL AND MECHANICAL CHARACTERISTICS OF BITUMENS AND ASPHALT CONCRETE MIXTURES BY MODIFICATION WITH RUBBER CRUMB

Abstract

The intensification of the process of oxidation of bituminous raw materials is important for
improving the quality of road construction materials. The aim of the work was to improve the physical and
mechanical characteristics of bitumen and asphalt concrete mixtures by oxidizing vacuum residue with the
addition of rubber crumb. In the work, the performance characteristics of rubber-bitumen binders and
asphalt concrete mixtures were determined using standard methods to establish their compliance with the
requirements of the standard and the influence of rubber crumb additives. The mixing process of vacuum
residue and modifier was carried out at a temperature of 180 С, the oxidation process - at 260 С, mixing
time - 1 hour, oxidation time - 2 hours. A pilot test of the prepared asphalt concrete mixtures was carried
out and an experimental section of the road was laid. A comparison of the traditional technology for
obtaining oxidized bitumen and the proposed method is shown, which confirms the intensification of the
oxidation process under the influence of a modifier.