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J. Pistrol, D. Adam:
"Simple Mechanical Modelling Applied to Dynamic Roller Compaction";
Talk: 13th International Conference on Theoretical and Computational Acoustics, Wien; 2017-07-30 - 2017-08-03.

In the scope of the special session dedicated to the memory of Dr. Franz Ziegler the paper provides an overview of the research activities in the field of soil dynamics performed over the recent 25 years at the worldwide first Institute of Soil Mechanics established at the Technische Hochschule Wien. The contribution focuses on a current research project, which deals with the dynamic near-surface compaction by oscillatory rollers.
Compaction is usually accomplished by vibratory rollers; the vibration of the drum is generated by rotating eccentric masses. Moreover, dynamic rollers with different types of excitation have been developed in the last decades, including rollers with directed vibration, feedback controlled rollers and oscillatory rollers.
A high-levelled quality management requires continuous control all over the compacted area, which can be achieved only by work-integrated methods. Roller integrated measurement and continuous compaction control (CCC) result in time and cost savings.
The basic principle of CCC systems is the assessment of the soil stiffness or compaction respectively based on an evaluation of the motion behaviour of the dynamically excited roller drum. CCC has become the state of the art method for an assessment of the compaction success over the past decades. Since it is a continuous roller- and work-integrated method, it is much more efficient compared to spot-like testing methods.
However, the application of CCC systems was limited to vibratory rollers. Therefore, the German roller manufacturer HAMM AG and the Vienna University of Technology launched a research project to investigate the motion behaviour of oscillatory rollers and the aim of developing the first functional CCC system for oscillating rollers.
Large-scale in situ tests were performed as well as theoretical investigations by means of a simple mechanical model, which resulted in the first functional CCC system for oscillating rollers. The study covers the basic principles of CCC systems, a description of the novel CCC value for oscillating rollers and a validation of the CCC system for oscillating rollers on the example of three roller types. Finally, recommendations for an ideal application of the new CCC system are provided.

Soil dynamics, compaction, rollers, oscillation, Continuous Compaction Control, CCC