Evaluation of Foamed Asphalt Stabilized Mixes with Improved Mechanistic Properties

A study was completed to determine the mechanistic properties of foamed asphalt stabilized mixes incorporating a liquid asphalt modifier called HyperExpand(tm) designed to improve the densification properties of the mixes. Mechanistic evaluation included determining the fatigue endurance using a fourpoint bending test and rutting resistance using an Asphalt Pavement Analyzer (APA). The study also investigated the densification characteristics of the mixes, determining the dry and wet tensile strengths, the Tensile Strength Ratio (TSR), and Fracture Face Asphalt Coverage (FFAC) analysis. It was found that improved densification properties corresponded with enhanced fatigue, rutting, and moisture sensitivity properties. FFAC analysis of the mixes using digital image analysis of high resolution photography revealed that the mixes with improved mechanistic properties exhibited better dispersion of the liquid asphalt cement in the mix. This suggests the dispersion of the liquid asphalt cement plays a fundamental role in the mechanical properties of the mix. (A)

Language

  • English

Media Info

  • Pagination: p. 363-375

Subject/Index Terms

Filing Info

  • Accession Number: 01149437
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada (TAC)
  • Files: TAC
  • Created Date: Jan 28 2010 7:33AM