Investigation of vibration compaction transfer characteristics of asphalt pavement for high-density

To improve the initial density of asphalt pavement behind the paver, it is necessary to study the compaction transfer characteristics of the paver vibrating device to the mixture. Aiming at the dynamic compaction system composed of a vibrating device and materials, considering the material characteristics of lower layer, the dynamic model of the interaction between vibrating device and asphalt mixture was established, and the theoretical calculation method of compaction transfer force and compaction transfer rate was proposed. Taking the compaction transfer force as the compaction capacity parameter and the compaction transfer rate as the compaction efficiency parameter during tampering compaction, the effect of vibration frequency, asphalt mixture characteristics and the stiffness of the lower layer on the vibration compaction transfer characteristics was studied. At the same time, the range of vibration parameters for high-density paving of asphalt pavement was obtained. Then, based on the compaction transfer characteristic parameters, the relationship between vibration compaction transfer force, compaction transfer coefficient and paving density was discussed, and simulation analysis and test were carried out. Results show that the frequency is 10% (about 4 Hz) of the maximum vibration frequency, the first peak density is 87%, and then the density gradually decreases. When the frequency is 45% (about 15 Hz), it reaches 84% of the low compactness section and then gradually increases. Furthermore, the vibration frequency percentage is 65% (about 22 Hz), reaching 88% of the second peak density, and the density gradually increases. Therefore, there is a relationship between density and theoretical calculation results of the compaction transfer force. In the range less than 22 Hz of the vibration frequency, the vibration compaction transfer force can be used as the characteristic parameter of the paving density. Research can provide the basis for the high-density paving and effective compaction of pavers to mixture. © 2023 Chinese Vibration Engineering Society. All rights reserved.