Evaluation of reclaimed asphalt pavement for surface mixtures.

Details

• Creators:
  McDaniel, Rebecca S. ; Kowalski, Karol J. ; Shah, Ayesha
• Corporate Creators:
  Purdue University. North Central Superpave Center
• Corporate Contributors:
  Purdue University. Joint Transportation Research Program ; Indiana Department of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Waste products (Materials)
  • Recycled materials
  • Asphalt pavements
  • Friction
  • Polishing (Aggregates)
  • Thermal stresses
  • Thermal expansion
  • Thermal fatigue
  • Cracking
  • Pavement cracking
  More +
• Publication/ Report Number:
  FHWA/IN/JTRP-2012/06
• Resource Type:
  Research Paper
• Geographical Coverage:
  Indiana
• Edition:
  Final report.
• Corporate Publisher:
  Purdue University. Joint Transportation Research Program
• Abstract:
  The Indiana Department of Transportation has successfully used Reclaimed Asphalt Pavement (RAP) for decades because of its economic ; and environmental benefits. Because of uncertainties regarding the types of aggregates contained in RAP and their resulting frictional ; properties, however, INDOT has until recently disallowed the use of RAP in asphalt surface mixtures. In addition, the hardened asphalt ; binder in the RAP could potentially increase the occurrence of thermal cracking. This research was conducted to explore the effects on ; RAP with poor or unknown aggregate qualities to establish maximum allowable RAP contents to provide adequate friction. The effects ; of RAP on thermal cracking were then investigated at the potential allowable RAP contents. ; Laboratory testing showed that the addition of poor quality RAP materials did impact the frictional properties and cracking resistance of ; the mixtures, but that lower amounts of RAP had little effect. The frictional performance of the laboratory fabricated and field sampled ; RAP materials was acceptable at contents of 25% but may be questionable at 40%. ; Field friction testing was also conducted on existing roadways with RAP to explore their field frictional performance. Several low volume ; roadways and one experimental interstate project were tested. The field results showed acceptable performance after 3 to 5 years of ; low volume traffic at RAP contents of 15‐25% and after more than 10 years of interstate traffic with 15% RAP. ; The low temperature testing showed an increased susceptibility to thermal cracking as the RAP content increased but the change in ; critical cracking temperature was relatively small at the 25% RAP level. At 40% RAP without a change in the virgin binder grade, the ; critical cracking temperature was about 6°C warmer than the control mixture. This finding supports the need for a binder grade change ; for RAP contents greater than 25%, as indicated in other research and as required by the current INDOT specifications.
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• Format:
  PDF
• Funding:
  SPR-3018
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24750/dot_24750_DS1.pdf
• File Type:
  [PDF - 11.26 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:9fae53b091f86935d0bbd793f6fb3d4fcc5fe6194ce90405f9ef6510da5ad192