INVESTIGATION OF THE RHEOLOGICAL PROPERTIES OF RUBBER–BITUMEN BINDERS

Abstract

This research is devoted to improving the structure and rheological properties of rubber–bitumen binders (RBB) through the modification of petroleum bitumen with crumb rubber and devulcanized rubber particles. The literature review comprehensively examines the physicochemical properties of bitumen, micellar and macromolecular structure theories, mechanisms of interaction between rubber particles and bitumen, and the scientific basis of rheological changes.

In the experimental part, 70/100 grade bitumen was used, and the influence of various rubber contents on the softening point, ductility, penetration, viscosity, and low-temperature brittleness was investigated. The results demonstrated that devulcanized rubber particles effectively integrate into the bitumen structure, form an elastic network, and enhance the stability of the binder at both high and low temperatures.

Rheological tests (Fraass breaking point, ring-and-ball softening point, penetration, and ductility tests) showed improved resistance to deformation, reduced phase angle, and increased complex modulus in modified binders. The findings confirm that rubber-modified bitumen is an effective solution for improving the long-term durability of road pavements.