New Methodology to Characterize the Workability of Asphaltic Concrete Mixtures Based on Kinematic Compaction Energy

The workability of asphalt mixtures influences the logistical processes and workmanship during pavement construction. There are various methods for analyzing the workability of asphaltic concrete mixtures. However, there is a lack of user-friendly laboratory methods that enable asphalt technologists, pavement engineers, laboratory technicians, and researchers to characterize the trend of workability via Newtonian physics. In this paper, a new methodology, based on momentum theory, has been proposed to evaluate the effects of construction temperature and compaction aid additives on mixture workability. Additionally, a new parameter, namely, the kinematic densifying index (KDI), is defined by the energy conservation theory. The results indicate a linear relationship between compaction energy and bulk specific gravity, which proportionally influence the indirect tensile strength of the mixtures. An adverse correlation between the KDI and the compaction energy index (CEI) was detected. The trend of the KDI strongly depends on the mixing temperature and the additive content. In conclusion, in the future, the KDI can be recommended as a supplementary indicator to analyze the workability of asphalt mixtures. More research is required to correlate the KDI and the other workability indicator for various aggregate gradations and binder types.