Abstract:

The process of modification of oxidized road bitumen with the production of polymer-bitumen binders (PBB) is studied. Various methods for preparing PBBs are considered: direct mixing with ground polymer, the use of a plasticizing solvent to distribute the polymer in the structure of bitumen. The plasticizer was selected; its effect on the main physicochemical parameters of bitumen was evaluated in accordance with GOST 33133-2014. It was revealed that when using the kerosene and gasoline fraction as a solvent in SRS with bitumen, it was not possible to obtain a homogeneous mixture. The compositions of polymer-bitumen binders based on synthetic rubber of isoprene and oxidized bitumen are obtained. It has been established that when using an oil extract as a plasticizer-solvent, it is possible to achieve the homogeneity of the SKI-bitumen system at a temperature of 150 °C. With an increase in the solvent fraction, the softening temperature of the studied compositions decreases; on the contrary, with an increase in the polymer content, the softening temperature increases

Keywords: bitumеn, роlymеr-bitumеn bindеr, рlаstiсizеr, isорrеnе synthеtiс rubbеr