Performance of reclaimed asphalt pavement (RAP) material in asphalt mixtures

The increasing cost of bitumen binder and stringent environmental regulations have driven highway agencies to maximize the amount of Reclaimed Asphalt Pavement (RAP) material for construction and rehabilitation of road pavements. The use of RAP in newly blended asphalt mixtures reduces the need for neat bitumen, making RAP as an economically attractive technology. However, because of already aged and stiffened bitumen in RAP, the use of higher percentages of RAP in asphalt mixture presents the challenges due to workability and compatibility during construction. In the present study a softer grade polymer modified bitumen (PMB) was developed with 7% Styrene-Butadiene-Styrene (SBS) copolymer and was used in preparation of RAP asphalt mixtures to improve the workability. RAP material obtained from Nashik was extracted using Soxhlet apparatus and the binder content was found to be 3.2% by weight of mixture. The asphalt specimens were prepared using Marshall hammer at 30, 40 and 50% RAP material. The indirect tensile strength ratio was greater than 80% for asphalt mixtures with and without RAP, the Hamburg wheel tracking results showed that the rutting values were less than 14mm after 20,000 cycles without stripping for specimens with and without RAP, while the indirect tensile fatigue life with 30% RAP was 10% higher than conventional asphalt at the stress level of 300kPa. From the test results it was observed that RAP added asphalt mixtures showed better laboratory performance than conventional asphalt mixtures in terms of moisture damage and rutting.


  • English

Media Info

  • Pagination: 9p
  • Monograph Title: Our everlasting roads – enabling future mobility: 18th AAPA International Flexible Pavements Conference and Exhibition, 18-21 August 2019, Sydney

Subject/Index Terms

Filing Info

  • Accession Number: 01718291
  • Record Type: Publication
  • Source Agency: ARRB Group Limited
  • Files: ITRD, ATRI
  • Created Date: Sep 26 2019 12:33PM