Dynamic Rollers in Earthworks: Compaction and Continuous Compaction Control

The quality of earth structures highly depends on the compaction state of fill layers, which can be made up of a wide range of various materials. 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. CCC provides relative values representing the evolution of the material stiffness all over the compacted area. These values have to be calibrated to relate them to customary values such as deformation modulus of static and dynamic load plate tests defined in contractual provisions and standards.