Abstract
Discrete element modeling has been used to simulate constant strain rate uniaxial compression tests for realistic asphalt mixture comprising of graded aggregate. A numerical sample preparation procedure was developed to represent the physical specimen. Parallel bonds have been used in the elastic modeling to give moment resistance at contacts. The uniaxial constant strain rate loading and unloading test has been simulated. The effects of normal to shear contact stiffness ratio on the bulk properties, the parallel bond radius, number of particles and their position, and loading speed have been investigated. A modified Burger’s model was used to introduce time dependent contact stiffnesses with the ability of transmission of moment. The two ball clump has been used to investigate the effect of particle shape. The constant strain rate uniaxial compression tests have been undertaken in the laboratory, the axial stress-strain response has been measured to compare with the numerical modeling results.
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