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Non-uniqueness of micro deformation of asphalt concrete



Title: Non-uniqueness of micro deformation of asphalt concrete
Author(s): L. B. Wang, C. S. Chang
Paper category : conference
Book title: Sixth International RILEM Symposium on Performance Testing and Evaluation of Bituminous Materials
Editor(s): M. N. Partl
Print-ISBN: 2-912143-35-7
e-ISBN: 2912143772
Publisher: RILEM Publications SARL
Publication year: 2003
Pages: 483 - 489
Total Pages: 7
Nb references: 10
Language: English


Abstract: Asphalt concrete as a bonded granular material demonstrates duality in response to external load. At macro level, the material behaves like a continuum due to the binder. At micro level, loads are transmitted through particle contacts and stress concentrations become very complicated due to the involved packing pattern of aggregates and void distributions. To investigate this duality a set of tests on asphalt concrete under repeated load has been observed at both macro level and micro level. At macro level, the magnitude and the pattern of permanent deformation were measured. At micro level, strain localization zones and crack distributions were captured as digital images. Four cross sections from one specimen were measured and the measurements were compared. The comparisons show that with the same macro responses of permanent deformation, the strain localization pattern and crack distribution are very different. This phenomenon has important implications to constitutive modeling of asphalt concrete. Explanations of the phenomena by micromechanics are presented.


Online publication: 2003-03-02
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143772.060


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