Verification of an asphalt aging test and development of superior recycling agents and asphalts

This study included an in-depth investigation of asphalt oxidation hardening and accelerated aging tests to simulate asphalt hardening on the road. A very significant finding is that the effect of both temperature and pressure on hardening rates is very asphalt dependent, so that any test run at a single elevated temperature or pressure can be very misleading. Equations are given which express asphalt oxidation as a function of both temperature and pressure which, with sufficient data, permit calculations at ambient conditions. Test section studies indicate that actual road aging is considerably slowed by diffusion resistance. Extensive studies were conducted on compositional effects in recycling. Hardening in asphalt is almost totally due to asphaltene formation. Recycling agents should be asphaltene free and low in saturates. Good mixing rules were developed for asphaltene free agents. In general, asphaltene free agents lowered the blend viscosity more than would normally be predicted from the agent viscosity. Aging studies on recycled material produced good results with some commercial agents as well as with fractions obtained by supercritical fractionation of asphalts.

• Corporate Authors:

  Texas Transportation Institute

  College Station, Texas  United States 
• Authors:
  • Davison, R R
  • Bullin, J A
  • Glover, C J
  • Chaffin, J M
  • Peterson, G D
  • Lunsford, K M
  • Lin, M S
  • Liu, Menglin
  • Ferry, M A
• Publication Date: 1994-11

Language

• English

Media Info

• Pagination: 322p
• Serial:
  • Issue Number: 1314-1F

Subject/Index Terms

• TRT Terms: Aging (Materials); Bitumen; Materials tests; Mix design; Oxidation; Pavement performance; Recycled materials; Temperature; Test procedures
• ATRI Terms: Ageing; Bitumen; Material testing; Mix design; Oxidation; Pavement performance; Recycling; Temperature; Test method
• Subject Areas: Design; Geotechnology; Materials;

Filing Info

• Accession Number: 01400871
• Record Type: Publication
• Source Agency: ARRB
• Files: ITRD, ATRI
• Created Date: Aug 23 2012 7:51PM