SECONDARY MATERIALS IN BITUMEN MODIFICATION AND IMPLEMENTATION OF CIRCULAR ECONOMY

This article explores the potential of using recycled materials for modifying bituminous binders within the framework of the circular economy concept. Polymer waste and crumb rubber were used for bitumen modification. The conducted research demonstrated that these additives enhance the thermal stability, flexibility, and oxidation resistance of bitumen. Furthermore, it was found that the performance characteristics of modified bitumen significantly improve: the brittle fracture temperature decreases, while the softening temperature increases. The optimal concentrations of modifiers were determined, and their effect on the bitumen structure was studied. As a result of the study, the BND 60/90 («POCR» LLP) + 6% FPMB mixture showed the best results in terms of thermal stability and hardness after oxidation, making it suitable for use in high-performance road pavements. The obtained results confirm the effectiveness of integrating recycled materials into road construction, highlighting their environmental and economic benefits. In line with the principles of the circular economy, the use of recycled polymers promotes the rational consumption of natural resources, waste reduction, and environmental sustainability. Such innovative approaches in road construction enable the creation of durable and long-lasting pavements. Moreover, this study proposes innovative methods for bitumen modification, contributing to the improvement of construction material quality and durability. Thus, the use of recycled materials helps enhance the strength of road pavements, minimize environmental impact, and achieve sustainable development goals.