Effect of polymer and functional additives on the properties of bitumen and asphalt-concrete
The possibility of modifying the oil road bitumen of the BND 70/100 grade is investigated; it belongs to the category of viscous bitumen and is used for road works in the warm season, with an average daily temperature not lower than +5°C. The material is widely used for repair work, and for laying new roads. Copolymers of styrene with butadiene and ethylene with vinyl acetate were used as polymeric materials for polymer-bitumen binders (PBV). Their optimal concentrations were determined for obtaining PBV with increased heat resistance and elasticity. Carbon nanotubes were used as a functional additive to bitumen.. The physical and mechanical properties of modifi ed bitumen and asphalt concrete mixtures based on them are given. It was shown that the introduction of even a small amount of nanotubes into asphalt concrete leads to an increased shear stability and strength at diff erent temperatures from 0 to 50°C.