Effectiveness of a Multigrade-Type Binder in Recycling Recovered Asphalt Pavement (RAP)

Recycling old asphalt pavement has both environmental and economic benefits, but one question persists: “Does the old binder, coating the RAP aggregate, intermingle with the binder in the new mix or does the RAP behave like black rock?” Complete mixing of the old and the new binder is essential for effective rejuvenation of the old binder. A study using an engineered PG 52-40 binder with various amounts of recycled asphalt pavement (RAP) (15, 30 and 45%) in a drum mix plant was conducted at a recycling project in Cornwall, Ontario Binders from the RAP pile and from recycled hot-mixes containing various amounts of RAP were analyzed using SUPERPAVE MP1 binder characterization. Low temperature fracture properties of slabs sawn from the pavements were also tested by the thermal stress restrained specimen test (TSRST). Similar thermal cracking temperatures were obtained for both the binders and their respective pavement slabs tests, confirming that the binder in the new mix had commingled with the RAP binder. The RAP was not behaving as black rock. It verified also that the PG 52-40 multigrade-type binder, in rejuvenating the RAP, yielded hot mixes with binder properties similar to those in a brand new mix, even at high RAP contents.

Language

  • English

Media Info

  • Media Type: Print
  • Pagination: pp. 1-16.
  • Monograph Title: Proceedings of the Forty-Seventh Annual Conference of the Canadian Technical Asphalt Association (CTAA): Calgary, Alberta

Subject/Index Terms

Filing Info

  • Accession Number: 01719152
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada (TAC)
  • Files: ITRD, TAC
  • Created Date: Oct 7 2019 2:54PM