INVESTIGATION OF THE PROPERTIES OF POLYMER-MODIFIED BITUMENS BASED ON NON-OXIDIZED RESIDUAL PETROLEUM RAW MATERIALS USING THE PERFORMANCE GRADE METHOD

The Superpave asphalt concrete mix design system, which has become widespread in many countries around the world, has proven its effectiveness in road construction and has taken a worthy place among other design systems, including in Russia. Consideration of climatic conditions and transport loads in the design of asphalt concrete mixtures and the determination of the fundamental rheological characteristics of binders is a unique feature of this system, which is based on concepts that did not exist before in Russia. In this regard, studies of the physico-mechanical characteristics of polymer modified bitumens (PMBs) obtained on the basis of non-oxidized oil residues (tar) were carried out using the PG method, the influence of the content of SBS-type block copolymer in PMBs and the properties of the initial oil residues on the determined characteristics was determined. In the course of the research, patterns of changes in physical and mechanical characteristics from the polymer content and properties of the original oil residues were identified. The obtained research results indicate that with an increase in the polymer content, the shear and low-temperature stability of PMB increases, while fatigue resistance has a rather complex character of change. PMBs obtained with more viscous oil residue are characterized by higher high-temperature characteristics, while PMBs obtained with less viscous residual raw materials are characterized by higher fatigue and low-temperature resistance. Obtaining PMB according to GOST R 58400.1-2019 with satisfactory characteristics is achieved when the polymer content in PMB is more than 4% by weight. When the polymer content in the composition of PMBs obtained using various tar is 5% by weight, the properties of PMBs correspond to grades PG 70-28 and PG 64-34. The results of the conducted research allow us to conclude that the technology of obtaining PMB, based on the use of petroleum tar as a feedstock, is a completely acceptable and effective technology for the production of PMB.