Material Characterization and Performance Properties of Superpave Mixtures

The primary objectives of this research study were to characterize properties of two North Carolina Department of Transportation (NCDOT) Superpave mixes with regard to fatigue distress, and to develop phenomenological fatigue relationships for these mixes based on various levels of strain, asphalt content, air void content, and temperatures. Of particular importance was the sensitivity of the Superpave mixes to asphalt content and air void content that are usually expected in-situ. Fatigue characterization of typical pavement sections using NCDOT fatigue models and using mechanistic analysis procedure suggests that the pavement fatigue life is sensitive to the mix variables and test temperatures considered in this study. A decrease in asphalt content by 0.5% (by weight of the mix) results in an 18 to 25% decrease in fatigue life. An increase of 2% in air void content reduced pavement life by about 40% for SP 12.5-mm mixes, and by almost 60% for SP 19-mm mixes. An increase in temperature was found to result in a decrease in fatigue life of the pavement section under consideration, although fatigue testing was conducted in controlled-strain mode-of-loading. A 5 deg C increase in temperature results in about 25% reduction in pavement life. Based on the overall result of the analysis, it appears that SP 19-mm mix is more sensitive to mix and test variables as compared to the SP 12.5-mm mix.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Bibliography; Figures; References; Tables;
  • Pagination: 175p

Subject/Index Terms

Filing Info

  • Accession Number: 01001262
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/NC/2004-11
  • Files: NTL, TRIS, USDOT, STATEDOT
  • Created Date: Jun 21 2005 3:55PM