Chapter
Apr 26, 2012
Aggregate Effect on Asphalt Mixture Properties by Modeling Particle-to-Particle Interaction
Authors: Zhanping You, Ph.D. [email protected], William G. Buttlar, Ph.D. [email protected], and Qingli Dai [email protected]Author Affiliations
Publication: Analysis of Asphalt Pavement Materials and Systems: Engineering Methods
Abstract
A number of researchers have studied aggregate characteristics including elongation, flatness, and other shapes that are believed to affect asphalt mixture properties such as internal resistance, rutting resistance, tensile strength, and complex modulus etc. However, the aggregate modulus also affects the asphalt mixture modulus significantly, which has not been taken into consideration. In this paper, the effect of aggregate particle-to-particle interaction was studied through numerical modeling using the discrete element modeling (DEM) approach. The individual material phases (e.g., aggregates and mastic) were modeled with clusters of discrete elements based upon laboratory testing of the individual phases. For a given set of material parameters for each phase, the degree of particle-to-particle contact in an asphalt mixture was found to have a profound influence on overall mixture modulus. A parametric investigation of aggregate modulus revealed that the contribution of aggregate modulus to overall mixture modulus was very significant. Pending further experimental verification on asphalt mixtures, this finding may shed new light on the importance of aggregate stiffness on overall mixture properties.
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© 2007 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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ASCE Technical Topics:
- Aggregates
- Design (by type)
- Discrete element method
- Engineering fundamentals
- Engineering materials (by type)
- Infrastructure
- Load and resistance factor design
- Load factors
- Material mechanics
- Material properties
- Materials characterization
- Materials engineering
- Methodology (by type)
- Mixtures
- Models (by type)
- Numerical methods
- Numerical models
- Particles
- Pavements
- Strength of materials
- Structural design
- Tensile strength
- Transportation engineering
Authors
Affiliations
P.E.
Tomasini Assistant Professor, Department of Civil and Environmental Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan, 49931-1295. E-mail: [email protected]
P.E.
Associate Professor, Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, IL 61801. E-mail: [email protected]
Visiting Assistant Professor, School of Technology and Department of Mechanical Engineering-Engineering Mechanics, 1400 Townsend Drive, Houghton, MI 49931. E-mail: [email protected]
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