Abstract
Porous asphalt concrete (PAC) has been widely used in the pavement for excellent performance in noise reduction and drainage. As a typical mixture with a skeleton-void structure, the performance of PAC is greatly affected by the compaction mechanism and internal structure of asphalt mixtures. This study tries to investigate compaction characteristics and migration trends of aggregate particles in porous asphalt mixtures prepared by a vertical vibration compaction method (VVCM) with different compaction parameters. The principal axis orientation and interlayer distance as evaluation indicators obtained by digital image processing (DIP) and Image-pro plus (IPP) software are used to evaluate the migration characteristics of aggregate particles in asphalt mixtures. The results show that the self-organization and immigration of aggregate particles in PAC are unified and the migration data of particles present statistical regularity. The aggregate particles are gradually deflected toward the horizontal direction to form a stable aggregate skeleton during the vibration compaction. Besides, the compaction degree of asphalt mixture in the middle and upper parts is significantly improved by the increase of the vibration frequency, while prolonging the vibration time is conducive to improve the compaction degree of asphalt mixture in the middle and lower parts.
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