Viscoelastic Tension-Compression Nonlinearity in Asphalt Concrete

A new one-dimensional (1D) viscoelastic creep formulation is proposed for modeling the recoverable deformation component in asphalt concrete (AC). The formulation is designed to accommodate different tensile and compressive properties in analogy with bimodular elasticity. It is structured as a Volterra equation of the second kind with a kernel that alternates between tensile and compressive compliances based on the sign of the viscoelastic (VE) strain. If the response is only in one direction, or if the viscoelastic properties are identical in both directions, the model degenerates to the linear Boltzmann superposition. As a demonstrative application, the theory was utilized to match the response of an asphalt specimen exposed to several load-unload-rest sequences in uniaxial tension-compression. It was found that two dissimilar creep functions were needed to achieve excellent reproducibility. At short times the two were almost overlapping while for longer times they departed such that the compliance associated with compression was lower than the tension-related compliance; this finding is in tune with previously reported experimental evidence. The new theory is deemed capable of correctly simulating viscoelastic tension-compression nonlinear behavior.

• Record URL:
  • https://doi.org/10.1061/(ASCE)MT.1943-5533.0001319
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/08991561
• Supplemental Notes:
  • © 2015 American Society of Civil Engineers.
• Authors:
  • Levenberg, Eyal
• Publication Date: 2015-12

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: 04015048
• Serial:
  • Journal of Materials in Civil Engineering
  • Volume: 27
  • Issue Number: 12
  • Publisher: American Society of Civil Engineers
  • ISSN: 0899-1561
  • EISSN: 1943-5533
  • Serial URL: http://ascelibrary.org/journal/jmcee7

Subject/Index Terms

• TRT Terms: Asphalt concrete; Compressive strength; Creep; Deformation; Loads; Tensile properties; Tension; Viscoelasticity
• Subject Areas: Highways; Materials; I30: Materials;

Filing Info

• Accession Number: 01562219
• Record Type: Publication
• Files: TRIS, ASCE
• Created Date: Apr 28 2015 3:09PM