Rheological properties of road bitumens modified with polymer and solid nanosized additives

The study of the viscoelastic properties of composites based on road bitumens have shown that the addition of polymeric modifiers (poly(bytadiene-block-styrene) or devulcanized rubber particles) substantially increases the storage and loss moduli and decreases the intensity of reduction in the storage modulus with temperature by several orders of magnitude. However, at high polymer content, growth inadmissible from the point of view of acceptable technological parameters is observed in the apparent viscosity. The introduction of carbon nanotubes into bitumen does not substantially affect its viscoelastic properties. Filling with meta-kaolin promotes an increase in the storage modulus at elevated temperatures. It has been shown that a direct correlation may be established between the objective characteristics of bitumen-based composites and standard specification parameters, such as penetration depth and heat resistance.