DEVELOPING SPECIFICATIONS FOR USING RECYCLED ASPHALT PAVEMENT AS BASE, SUBBASE OR GENERAL FILL MATERIALS, PHASE II

This Phase II work focused on 1) validating the Phase I developmental specifications for using Recycled Asphalt Pavement (RAP) as a base, subbase or general fill, 2) evaluating the strength gain of RAP within the first two months after construction, 3) evaluating RAP-Soil mixes in the laboratory, and 4) evaluating the environmental performance of RAP in the field. The Phase I Developmental Specifications were updated to allow RAP as a subbase below rigid pavements. A second field site was constructed using RAP and a Limerock control section. It included surface water and leachate water collection systems in both the RAP and Limerock. The initial strength gains were evaluated over an 8-week period and the environmental performance was analyzed over 12 months. Construction with RAP was equivalent to or better than construction with Limerock. RAP's strength-deformation behavior increased throughout the 8-week study period based on field California Bearing Ratio (CBR) data converted to Limerock Bearing Ratio (LBR), Initial Stiffness Modulus (ISM) values from the Falling Weight Deflectometer (FWD), and stiffness values from both the Clegg Impact Hammer and the Soil Stiffness Gage (SSG). LBR, Clegg and ISM data indicated that RAP experienced a 50% strength gain over 8 weeks while the SSG results indicated that the strength gain was 15%. The Clegg, FWD and SSG testing also indicated that RAP stiffness was similar to Limerock. RAP-Soil mixes were evaluated by adding varying percentages of a poorly graded sand with clay, an A-2-6 (SM-SP) soil dredged from the Turkey Creek area in Palm Bay, Florida. The 80% RAP-20% soil mix produced the most desirable engineering behavior. Preliminary creep testing indicated that both the 100% RAP and the 80/20 RAP-Soil mix may pose long term deformation concerns. The environmental evaluation indicated that RAP poses no environmental concerns when used as a highway material. The concentrations of heavy metals were well below the EPA standards. Samples were taken over a 12-month period and subjected to four different environmental testing procedures. All four yielded the same conclusions, indicating that the testing program was valid.

• Record URL:
  https://fdotwww.blob.core.windows.net/sitefinity/docs/default-source/research/reports/fdot-bc819-rpt.pdf
• Record URL:
  https://ntlrepository.blob.core.windows.net/lib/24000/24800/24879/CVE_Final_Report.pdf
• 
• Corporate Authors:

  Florida Institute of Technology, Melbourne

  Department of Civil Engineering
  Melbourne, FL  United States  32901-6975

  Florida Department of Transportation

  Haydon Burns Building, 605 Suwanee Street
  Tallahassee, FL  United States  32301
• Authors:
  • Cosentino, P J
  • Kalajian, E H
  • Shieh, C-S
  • Mathurin, WJK
  • Gomez, F A
  • Cleary, E D
  • Treeratrakoon, A
• Publication Date: 2003-7-10

Language

• English

Media Info

• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 271 p.

Subject/Index Terms

• TRT Terms: Asphalt pavements; Base course (Pavements); California bearing ratio; Creep tests; Deformation; Environmental impact analysis; Falling weight deflectometers; Field tests; Fillers (Materials); Hammers; Heavy metals; Laboratory tests; Recycled materials; Sandy clays; Stiffness; Strength of materials; Subbase materials
• Uncontrolled Terms: Limerock bearing ratio; Soil stiffness gage
• Geographic Terms: Florida
• Subject Areas: Geotechnology; Highways; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00962190
• Record Type: Publication
• Report/Paper Numbers: FL/DOT/RMC/06650-7754,, Final Report
• Contract Numbers: BC-819
• Files: NTL, TRIS, STATEDOT
• Created Date: Aug 28 2003 12:00AM