Modeling of asphalt mixture laboratory and field compaction using a thermodynamics framework
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The objective of this paper is to present a model, developed within the context of a thermomechanical framework, for the compaction of asphalt mixtures. The asphalt mixture is modeled as a nonlinear compressible material exhibiting time-dependent properties. A numerical scheme, based on finite elements, is employed to solve the equations governing compaction mechanisms. Due to the difficulty of conducting tests on the mixture at the compaction temperature, a procedure was developed to determine the model's parameters from the analysis of the Superpave gyratory compaction (SGC) curves. A number of mixtures were compacted in the SGC using an angle of 1.25 in order to determine the model's parameters. Consequently, the model was used to predict the compaction curves of mixtures compacted using a 2 angle of gyration. The model compared reasonably well with the SGC compaction curves. Finite element simulations of the compaction of a pavement section using a roller compactor were conducted in this study. The results demonstrated the potential of the material model to represent asphalt mixture field compaction. The developed model is a useful tool for simulating the compaction of asphalt mixtures under laboratory and field conditions. In addition, it can be used to determine the influence of various material properties and mixture designs on model's parameters and mixture compactability.