01363777

Component

http://www.trb.org/Publications/Blurbs/166591.aspx

Micromechanics have been shown to provide an attractive alternative over purely empirical models for use in predicting key physical properties of composite materials, such as the dynamic modulus of asphalt concrete. Although there are certainly trade-offs (computational expense with model complexity and accuracy), advances in personal computer processing speed have brought even the most complex 2-D simulations into the realm of possibility for routine design. However, there is a limit to the accuracy that can be obtained with 2-D models (not all contacts between aggregates can be seen in a 2-D model, nor can the air voids be properly portrayed), and thus, ultimately 3-D models will be needed in order to obtain the best possible results. That limitation notwithstanding, analytical models and 2-D simulation models with a modest degree of calibration can be employed in a practical way today. Work on 3-D modeling is progressing at a rapid pace, is research ready now, and will be available to the practitioner in the next 5 to 10 years. Moreover, micromechanical models provide researchers with something that empirical models simply cannot deliver: insight. New insight in stiffening mechanisms, damage mechanisms, and fracture mechanisms provide a tool that can allow material formulators and designers to see inside the material, creating possibilities for completely new material systems to be explored. The models presented herein can also be applied in the emerging fields of multiscale modeling and nanotechnology.

01363774

English

pp 17-28

2012-1

Transportation Research Circular

Digital/other

Figures; References; Tables

Asphalt mixtures; Properties of materials; Simulation

Micromechanical models; Three dimensional models; Two dimensional models

Highways; Materials; Pavements; I31: Bituminous Binders and Materials

TRIS, TRB

Feb 23 2012 3:27PM

• Applications of Advanced Models to Understand Behavior and Performance of Asphalt Mixtures. Introduction
• Characterization of the Internal Structure of Asphalt Mixtures
• Use of Fracture Tests and Models
• Viscoelastic Continuum Damage Model
• Viscoplastic Modeling of Bituminous Mixtures