INVESTIGATION OF RHEOLOGICAL PROPERTIES OF RUBBER-BITUMEN BINDERS

Abstract

This research focuses on the modification of petroleum bitumen using crumb rubber, devulcanized rubber, epoxy resin, and plasticizers to improve the structural and rheological properties of rubber-modified bituminous binders (RMB). The literature review covers the physicochemical characteristics of bitumen, micellar and macromolecular structural theories, the interaction mechanisms between rubber and bitumen, and the scientific basis for rheological changes during modification.

In the experimental section, bitumen grade 70/100 was modified with various amounts of rubber additives. The effects on softening point, ductility, penetration, viscosity, and low-temperature brittleness were evaluated. Results demonstrated that devulcanized rubber interacts more effectively with bitumen, forming a uniform elastic network and significantly enhancing both high- and low-temperature performance. Rheological testing (Fraass, Ring-and-Ball, penetration, ductility) showed increased rutting resistance, reduced phase angle, and higher complex modulus in modified binders. The findings confirm that rubber-modified bitumen provides improved durability and long-term performance for road pavements.