Using Warm-Mix Asphalt Technology to Incorporate High Percentage of Reclaimed Asphalt Pavement Material in Asphalt Mixtures

The use of reclaimed asphalt pavement (RAP) helps save natural resources and money. The percentage of RAP that can be utilized successfully in hot-mix recycling is primarily dictated by practical considerations. To avoid deterioration of the aged binder, RAP should not be exposed to relatively high temperatures. This study investigated the feasibility of using a warm-mix asphalt (WMA) additive, Sasobit H8, in successfully recycling hot-mix asphalt (HMA) with 75% RAP at a lower temperature. A control HMA was prepared with extracted aggregates and PG (performance grade) 64-28 binder at 150ºC. Another HMA was produced with PG 52-28 binder at 135ºC. Two WMA mixes were prepared with Sasobit H8 at 125ºC, one with PG 52-28 and the other with PG 42-42 binder. Samples with design asphalt content were compacted by using 75 gyrations of the Superpave gyratory compactor. Their voids, tensile strength at –10ºC, rutting potential at 60ºC, and moduli at 0ºC, 25ºC, and 40ºC (at different times) were determined and compared. The moduli samples were subjected to 60ºC in between the tests. The results show that it is possible to produce mixes with 75% RAP with similar air voids as virgin mixes at lower than conventional temperatures using 1.5% Sasobit. The addition of a significantly lower grade of binder, PG 42-42, at a rate of 1.5% by weight of mix produced a mix that is most comparable with a virgin mix.

• Record URL:
  • https://doi.org/10.3141/2051-09
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=Using+Warm-Mix+Asphalt+Technology+to+Incorporate+High+Percentage+of+Reclaimed+Asphalt+Pavement+Material+in+Asphalt+Mixtures&author=R.+Mallick&author=P.+Kandhal&author=R.+Bradbury&publication_year=2008
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780309113236
• Authors:
  • Mallick, Rajib B
  • Kandhal, Prithvi S
  • Bradbury, Richard L
• Publication Date: 2008

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 71-79
• Monograph Title: Components of Bituminous Paving Mixtures 2008
• Serial:
  • Transportation Research Record: Journal of the Transportation Research Board
  • Issue Number: 2051
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Air voids; Asphalt content; Asphalt mixtures; Bituminous binders; Hot mix asphalt; Natural resources; Recycled materials; Rutting; Superpave; Tensile strength; Warm mix paving mixtures
• Identifier Terms: Sasobit
• Uncontrolled Terms: Gyratory compaction; Seismic moduli
• Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01089632
• Record Type: Publication
• ISBN: 9780309113236
• Files: TRIS, TRB, ATRI
• Created Date: Mar 3 2008 9:00AM