Two-Scale Discrete Element Modeling of Gyratory Compaction of Hot Asphalt
Publication: Journal of Engineering Mechanics
Volume 148, Issue 2
Abstract
This paper presents a discrete element model for simulations of the compaction process of hot mixed asphalt (HMA). The model is anchored by the concept of a fine aggregate matrix (FAM), which consists of the binder and fine aggregates. In the simulation, the coarse aggregates are explicitly modeled as composite particles. Meanwhile, the FAM is considered as the thick coating of the coarse aggregates with complex constitutive laws. Interparticle interactions include influences of (1) particle properties via Hertz–Mindlin relations; and (2) FAM properties via lubrication relationships. The lubrication relationships include a variable for viscosity for which we derive normal and tangential rate-dependent forms using rheology theory of dense granular-fluid systems, verified reasonable for our systems with the discrete element simulations and experiments with FAM. We assimilate these elements into gyratory compaction simulations of HMA of different aggregate size distributions. We compare these with experiments and find that this model is capable of capturing the measured effects of grain size distribution on the overall compaction behavior of HMA. We conclude by highlighting the advantages of this discrete element model for HMA compaction problems.
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Data Availability Statement
All data and models that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors acknowledge the financial support from the Minnesota Department of Transportation through grant WO20 to the University of Minnesota (UMN) and from the Center of Transportation Studies at UMN and the computing resources provided by Saint Anthony Fall Laboratory at UMN. Hill gratefully acknowledges support for studying the rheology of particle-fluid mixtures from the National Science Foundation (NSF GLD-1451957). T. Man also gratefully acknowledges the Sommerfeld Fellowship provided by the Department of Civil, Environmental, and Geo-Engineering at UMN.
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Journal of Engineering Mechanics
Volume 148 • Issue 2 • February 2022
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© 2021 American Society of Civil Engineers.
History
Received: Apr 15, 2021
Accepted: Aug 30, 2021
Published online: Nov 23, 2021
Published in print: Feb 1, 2022
Discussion open until: Apr 23, 2022
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