Improving the efficiency of the asphalt concrete mixture compaction with a smooth drum roller

   The durability of the structure as a whole depends on the operation quality of the asphalt concrete pavement compaction performed during the construction of a highway by a road roller. In the course of compaction, the asphalt concrete layer resistance to deformation increases that is due to the continuous cooling of the material, as well as an increase in its density with each passes of the roller. At the same time, the maximum specific pressure under the drum of a road roller is limited by its design parameters. Therefore, each roller can effectively perform the compaction operation within a certain range of physical and mechanical characteristics of the layer.
   The objective of the study is to increase the asphalt concrete mixture compaction efficiency by a smooth-drum road roller by expanding the technological boundaries of the machine's application. To solve this problem, the interaction process of a smooth roller with an asphalt concrete layer is considered. To describe the behaviour of the asphalt concrete layer during loading, the Kelvin model is adopted. Considering the balance of forces acting over the area of contact of the roller with the material to be compacted, taking into account the initial conditions, a system of nonlinear algebraic equations was obtained, which makes it possible to determine the arc length of the roller contact with the material. As a study result of the function of the specific pressure under the roller of the roller to the maximum, an equation was obtained to determine the value of the maximum specific pressure under the roller of the roller. On the basis of the obtained theoretical results, a dynamic simulation of the asphalt concrete mixture compaction with a roller of a roller was carried out.
   Analysis of the simulation results made it possible to draw a conclusion about the possibility of a significant change in the maximum specific pressure under the drum by regulating the speed of the roller. Taking into account the developed technique, an automatic control system is proposed for continuous monitoring of the compaction efficiency. The proposed automatic control system makes it possible to increase the efficiency of the asphalt concrete mixture compaction by the road roller by maintaining the value of the maximum specific pressure under the roller of the roller at the level of the ultimate strength of the compacted layer. Varying the value of the maximum specific pressure under the roller drum is carried out depending on the physical and mechanical characteristics of the compacted layer of the asphalt concrete mixture and is ensured by promptly changing the speed of the machine.

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