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Publication Number: FHWA-HRT-99-144
Date: June 2001

 

Microdamage Healing in Asphalt and Asphalt Concrete, Volume IV: A Viscoelastic Continuum Damage Fatigue Model of Asphalt Concrete With Microdamage Healing

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Abstract

A mechanistic approach to fatigue characterization of asphalt-aggregate mixtures is presented in this I volume. This approach is founded on a uniaxial viscoelastic constitutive model that accounts for damage I evolution under cyclic loading conditions. The elastic-viscoelastic correspondence principle is applied in I order to evaluate damage growth and healing in cyclic loading separately from time-dependent characteristic I of the material. The damage growth during loading cycles and healing during rest periods are modeled using work potential theory, a continuum damage theory based on thermodynamics of irreversible processes. I Internal state variable formulation was used in developing the analytical representation model. Tensile I uniaxial fatigue tests were performed in the controlled-strain mode with different strain amplitudes to determine model parameters. The resulting constitutive model successfully predicts the damage growth of I asphalt concrete under monotonic loading at varying strain rates and damage growth and recovery due to complex loading histories, in both controlled-strain and controlled-stress modes, composed of randomly applied multi-level loading with different loading rates and varying durations of rest.

Fatigue lives of two different mixtures were predicted with reasonable accuracy using the constitutive I model for the constant stress-strain amplitude cyclic loading histories with and without rest periods. A standard uniaxial fatigue test protocol is proposed by simplifying the experimental approach used in developing the constitutive model.

 

 


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The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT). Provide leadership and technology for the delivery of long life pavements that meet our customers needs and are safe, cost effective, and can be effectively maintained. Federal Highway Administration's (FHWA) R&T Web site portal, which provides access to or information about the Agency’s R&T program, projects, partnerships, publications, and results.
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