Discrete Element Simulation of Creep Behavior in Asphalt Mixtures<br/>

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Discrete Element Simulation of Creep Behavior in Asphalt Mixtures

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 46837 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Tabatabaei, Nader
Abstract:
Composite nature of asphalt mixtures necessitates a micromechanical scheme which depends on distinctive characteristics of various constitutive phases. In this regard, discrete element method was utilized to predict the creep behavior of asphalt mixtures and strain response in primary, secondary and tertiary stages. In this research, a modified mixture modeling procedure was considered to better simulate permanent deformation response of asphalt mixtures under creep loading. A random distribution of mastic and aggregate particles with respect to a typical dense gradation was implemented to reconstruct cylindrical specimens. A bonding model represented the cohesion effect in mastic interactions. In order to characterize viscoelastic properties of mastic, a novel procedure, namely Mastic Beam Test (MBT), was designed. Moreover, a new method was considered to simulate static and dynamic loading conditions and the resultant responses were satisfactory
Keywords:
Discrete Element Method ; Mastic ; Creep Behavior ; Viscoelastic Behavior ; Asphalt Concrete

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