Alternate Shift Factor Relationship for Describing Temperature Dependency of Viscoelastic Behavior of Asphalt Materials

Traditionally, various forms of shift factors such as Arrhenius, Williams–Landel–Ferry (WLF), and polynomials have been used with asphalt materials. Shift factors have also been estimated with binder viscosity parameters. Successful extrapolation of viscoelastic functions requires a robust form of shift factor–temperature relationship. This form is important for performing calculations at the extremes of temperature found in practice. A preliminary analysis of complex modulus E* data of mixtures obtained from the "Mechanistic–Empirical Pavement Design Guide" (MEPDG) database demonstrated that the Kaelble form of shift factor could describe the functional form of the shift factor more accurately than the Arrhenius, WLF, or polynomial-fitting functions. However, the Kaelble shift function as originally described uses the same temperature as a reference temperature and as an inflection temperature. This factor creates a problem when attempts are made to implement the function in a design method or when materials are compared at a given temperature. Since 2008, additional work has investigated the use of this shift function to describe the properties of asphalt materials, particularly mixes and materials that require a wide range of property description (both above and below the glass transition or some other defining point). A modified form of the Kaelble function has been implemented in analysis software and thus makes multiple calculations more rapid. Additional analysis working with MEPDG E* database materials has shown that shifting works best with the Kaelble modification of the WLF equation. The same method has been applied to other asphalt materials.

• Record URL:
  https://doi.org/10.3141/2207-16
• Summary URL:
  http://scholar.google.com/scholar_lookup?title=Alternate+Shift+Factor+Relationship+for+Describing+Temperature+Dependency+of+Viscoelastic+Behavior+of+Asphalt+Materials&author=G.+Rowe&author=M.+Sharrock&publication_year=2011
• Availability:
  • Find a library where document is available. Order URL: http://www.trb.org/Main/Blurbs/166211.aspx
• Authors:
  • Rowe, Geoffrey M
  • Sharrock, M J
• Publication Date: 2011

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References;
• Pagination: pp 125-135
• Monograph Title: Asphalt Materials and Mixtures 2011, Volume 1
• Serial:
  • Transportation Research Record: Journal of the Transportation Research Board
  • Issue Number: 2207
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Asphalt mixtures; Bituminous materials; Equations; Functions (Mathematics); Modulus of elasticity; Temperature; Viscoelasticity
• Identifier Terms: Mechanistic-Empirical Pavement Design Guide
• Subject Areas: Highways; Materials; Pavements; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01336689
• Record Type: Publication
• ISBN: 9780309167437
• Report/Paper Numbers: 11-3692
• Files: TRIS, TRB, ATRI
• Created Date: Apr 18 2011 12:24PM