Dynamisches Interaktionsverhalten zwischen Oszillationsbandagen und Asphaltoberflächen
Otto, Frederic; Oeser, Markus (Thesis advisor); Radenberg, Martin (Thesis advisor); Eckstein, Lutz (Thesis advisor); Hegger, Josef (Thesis advisor)
Dissertation / PhD Thesis
In order to ensure a sufficient durability of asphalt pavements, a minimal level of compaction is required by the technical guidelines. In order to reach this goal, roller compactors are being used during the manufacturing process of asphalt pavements to achieve the final level of compaction. The technique of oscillatory compaction offers one of many possible methods for dynamic roller-compactions in soil and road construction. The procedure consists of creating a rotational vibration in the roller drum, which introduces a horizontal cyclic shear stress into the asphalt layer and therefore contributes to the compaction. The transmission of vibrations is achieved by friction between the surface of the drum and the asphalt. Cases of high loss of frictional contact can lead to abrasion and wear of the drum surface. The compaction result is being assessed according to the current state-of-the-art after the final step of the manufacturing process. Potential quality flaws cannot be removed anymore at this point unless an unreasonably high effort is taken into account. Methods of dynamic continuous compaction control allow a monitoring of the mechanical properties of the material that is to be compacted. While this allows in earthworks an assessment of the compaction state, the same cannot be done in asphalt compaction due to the temperature-dependent properties. The following work analyzes the interaction behavior between an oscillatory drum and the asphalt pavement surface. This is done with the use of a simulation model, which allows the analysis and evaluation of the reciprocal relation of the roller-to-asphalt layer transmission of vibrations and the compaction progress. The main goal is to derive criteria for an optimized use of oscillatory compactors in terms of mechanical and asphalt technology. Furthermore, the understanding of the processes that take place during the compaction process inside of the asphalt layer is to be improved. Thus, this work contributes to quality control in pavement engineering.