Introduction. The article investigates asphalt mixtures produced by standard technology according to [1, 2] and the so-called warm asphalt mixtures produced at reduced process temperatures based on bitumen with the addition of energy-saving additives and foamed bitumen.
Problems. The resistance of asphalt mixtures to rutting is a key parameter in the design of the mixture, as the load on the pavement structure is increasing under current conditions due to the increased transport capacity of new vehicles that can carry loads with higher than standard axle loads.
Objective. The aim of the study was to investigate asphalt mixtures made using standard technology according to [1, 2] and the so-called warm asphalt mixtures made at reduced process temperatures based on bitumen with the addition of energy-saving additives and foamed bitumen.
Materials and methods. Experimental comparative tests of traditional hot asphalt concrete ASG.Sh.N.I.A.BND 70/100, asphalt concrete using foamed and bitumen, and asphalt concrete based on bitumen with the addition of energy-saving additives were carried out.
Results. Graphical dependences of rut formation after more than
20 thousand passes of the wheel on samples of asphalt mixtures produced by different methods and at different process temperatures.
Conclusions. The studies have shown that the use of warm asphalt concrete technologies makes it possible to reduce the temperature of preparation of hot asphalt mixtures by 20-40 °C without compromising the resistance to rutting compared to traditional hot asphalt concrete prepared with the same bitumen. This is achieved due to relatively new physicochemical effects that lead to a decrease in the shear resistance of the mixture during its preparation and compaction.
