TECHNOLOGICAL HOT AND CAST ROAD ASPHALT MIXES
Based on the methodology of the system analysis of the proposed physical and chemical models of modified asphalt binders and asphalt concretes using an experimental and statistical description, new science-based technological solutions have been developed and implemented for obtaining complex-modified hot and cast asphalt-polymer-sulfur concrete mixtures for the installation and maintenance of non-rigid pavement pavements of highways increased durability, capable of withstanding rutting, fatigue failure, crack resistance and thermal oxidation, as a result of the complex modification of petroleum road bitumen with butadiene methylstyrene rubber SKMS-30 together with technical sulfur and the formation of a spatial polymer network in the organic binder. Hot asphalt polymer concrete with complex modified microstructures of optimal compositions is characterized by the following quality indicators: compressive strength, MPa at 0 °C R0 = 8...10, at 20 °C R20 = 5,0...6,5, at 75 °C R75 = 1,2...1,4; swelling, % of volume - 0; water saturation, % of the volume 1,5...2,0. Cast asphalt polymersulfur concretes are characterized by increased shear resistance at high positive operating temperatures (conditional Marshall stiffness at 60 °C 23,1 kN), longterm water resistance coefficient (90 days), Kvd = 0,89, frost resistance coefficient after 100 cycles of alternating freezing thawing F = 0,85, coefficient of thermal aging after 2 000 hours of heating in the climatic chamber IP1 at a temperature of 75 °C and ultraviolet irradiation, Kst = 1,27. Technologies for the production, laying and compaction of hot asphaltpolymersulphurconcrete mixtures have been developed