Permanent deformation in asphalt concrete

Andrew Drescher, Jong R. Kim, David E. Newcomb

Research output: Contribution to journalArticle

34 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)112-128
Number of pages17
JournalJournal of Materials in Civil Engineering
Volume5
Issue number1
DOIs
Publication statusPublished - Feb 1993

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ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials

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