Permanent Deformation in Asphalt Concrete
Publication: Journal of Materials in Civil Engineering
Volume 5, Issue 1
Abstract
Permanent deformation in asphalt concrete pavements manifests itself as depressions along the wheel paths, ruts. The prediction of rut depth requires a knowledge of materials characteristics that relate the asphalt concrete permanent strains to stress and temperature. This paper analyzes the character of permanent strains as inferred from a creep/recovery test. It is shown that the separation of the strains into the time‐independent elastic and plastic strains and the time‐dependent viscoelastic strains requires tests with various times to unloading. The analysis is illustrated with the results of a series of uniaxial compression creep/recovery tests on one asphalt concrete mixture. The tested material exhibits temperature‐dependent elastic and plastic strains that are proportional to the level of stress. The time‐ and temperature‐dependent viscoelastic strains are nonlinearly related to the stress level and stress history. An approximate constitutive equation that disregards this nonlinearity is presented.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 5 • Issue 1 • February 1993
Pages: 112 - 128
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Sep 20, 1991
Published online: Feb 1, 1993
Published in print: Feb 1993
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