EVALUATION OF LONG-TERM BEHAVIOR OF COLD RECYCLED ASPHALT MIXTURE (ABRIDGMENT)

The technique of recycling asphalt pavement materials has been widely used in the past decade, but unsolved problems such as rutting and instability still exist. Softening agents or low-viscosity binders such as emulsified asphalts are usually added during the cold recycling process, which may have a slow softening reaction. Thus, the properties of the recycled mixtures as controlled by several factors, including the oxidation hardening of the new bituminous materials and the softening effect of the softening agents or emulsions. An evaluation of the long-term behavior of such mixtures by means of both creep and Marshall tests conducted at 75 deg F is presented. The mixture was artificially aged by curing at 140 deg F up to 60 days and tested at different ages. The creep compliance of both virgin and recycled mixtures decreased rapidly at early ages due to the oxidation of the asphalt mixtures decreased rapidly at early ages due to the oxidation of the asphalt binder and then remained essentially the same. No large difference was observed in the creep behavior of the virgin and recycled mixtures. Neither creep nor Marshall test results support the hypothesis that the emulsified asphalt used in the study has a long-term softening effect on the old asphalt binder. (Author)

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 64-66
  • Monograph Title: Asphalt materials, mixtures, construction, moisture effects and sulfur
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00390792
  • Record Type: Publication
  • ISBN: 0309035546
  • Files: TRIS, TRB
  • Created Date: Dec 30 1984 12:00AM