Statewide Variability of Florida’s Reclaimed Asphalt Pavement

Recycling of Reclaimed Asphalt Pavement (RAP) in highway base course can provide both environmental sustainability and economic benefits for highway applications. RAP can be recycled into new hot mix asphalt or recycled on site through hot in-place recycling, cold in-place recycling (CIR), full depth reclamation (FDR), or use as a fill material. The properties of RAP vary depending on the mix design of the pavement, removal method, and processing after removal. The objective of this research was to examine the variability of RAP across the state of Florida and determine which properties impacted potential for reuse in highway earthwork applications. Raw (milled) and processed (crushed) RAP was sampled at 50 geographically dispersed locations across the state. Specimens were tested for asphalt content, gradation, and bearing strength. Bearing strength was evaluated using the Florida Department of Transportation (FDOT) limerock bearing ratio test (LBR), a variant of the California Bearing Ratio (CBR) test. Milled and crushed RAP differed in both asphalt content and gradation. Asphalt content typically fell in the range of 5.5% - 8.0% asphalt content for milled RAP and 4.5% - 7.0% for crushed RAP. Maximum dry density and LBR strength showed weak to moderate negative correlation to asphalt content and weak to strong correlation with gradation parameters, particularly those related to fines content. None of the RAP tested met FDOT base course strength specifications and only a single specimen met stabilized subgrade strength specifications.

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• Supplemental Notes:
  • This paper was sponsored by TRB committee AFP70 Mineral Aggregates.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Cosentino, Paul J
  • Bleakley, Albert M
  • Sandin, Carl M
• Conference:
  • Transportation Research Board 94th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2015-1-11 to 2015-1-15
• Date: 2015

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: 18p
• Monograph Title: TRB 94th Annual Meeting Compendium of Papers

Subject/Index Terms

• TRT Terms: Aggregate gradation; Asphalt content; Bearing capacity; Properties of materials; Reclaimed asphalt pavements
• Uncontrolled Terms: Variability
• Geographic Terms: Florida
• Subject Areas: Highways; Materials; Pavements; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01552770
• Record Type: Publication
• Report/Paper Numbers: 15-4504
• Files: PRP, TRIS, TRB, ATRI
• Created Date: Feb 3 2015 5:10PM