01363780

Component

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

A key feature of bituminous mixtures is the accumulation of permanent deformations as a function of load magnitude, rate, and duration. Viscoplastic constitutive models that treat the heterogeneous bituminous composite as an equivalent homogeneous continuum are one approach for predicting this material behavior. The main components of all viscoplastic models are a yield criterion to govern the onset and magnitude of yielding and a flow rule to dictate the directions of the ensuing viscoplastic strains. Most models also include some type of hardening or softening law to reflect the evolution of material strength with accumulated strain. Material behavior prior to yield and during unloading is typically modeled using conventional elastic or viscoelastic models, often with the inclusion of microstructural damage effects. This section briefly outlines the conceptual underpinnings of viscoplasticity theory. This description is followed by examples of the application of the theory to various pavement engineering questions and scenarios, with an emphasis on predictions of real-world pavement behavior and performance.

01363774

English

pp 64-77

2012-1

Transportation Research Circular

Digital/other

Figures; References

Bituminous mixtures; Mathematical models; Pavement performance; Rutting; Viscoplasticity

Constitutive models

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

TRIS, TRB

Feb 24 2012 8:54AM

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