POTENTIAL USE OF DEFLECTION MEASUREMENTS TO ASSIST IN DESIGNING RECYCLED ASPHALT CONCRETE PAVEMENTS. FINAL REPORT

The results of a Caltrans study to evaluate hot and cold-recycled asphalt concrete (AC) pavement using pavement deflections is presented. Information from three projects is used to determine gravel equivalent factors for hot- and cold-recycled AC as well as existing in-place AC pavement. Results from statistical analysis indicate that hot-recycled AC is equivalent to a new dense graded AC in terms of gravel equivalent factor of 1.9. Hot-recycled AC can, therefore, be used for rehabilitating pavements requiring improved structural adequacy or for control of reflection cracking. Cold-recycled AC was found to have a gravel equivalent factor equal to 1.5. Since minimal strength is added to the existing pavement by cold-recycling, it is recommended that it generally be used for pavements requiring control of reflection cracking and/or minimal structural improvement. The existing AC pavement was assumed to vary in strength depending on the condition of the pavement at the time of rehabilitation. Suggested gravel equivalent factor values for existing AC pavement range from 1.1 to 1.4 depending on condition. An interim design for hot-recycled and cold-recycled pavement structural sections is proposed. It is suggested that further research be done on cold-recycled pavement to verify the conclusions of this study.

• Corporate Authors:

  California Department of Transportation

  Transportation Laboratory
  5900 Folsom Boulevard
  Sacramento, CA  United States  95819

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Moore Jr, R L
• Publication Date: 1985-2

Media Info

• Pagination: 40 p.

Subject/Index Terms

• TRT Terms: Alternatives analysis; Asphalt concrete; Cold in-place recycling; Cold weather; Deflection; Driver rehabilitation; Gravel; Hot in-place recycling; Pavements; Recycling; Reflection cracking; Strength of materials; Traffic equivalence factor
• Uncontrolled Terms: Rehabilitation
• Old TRIS Terms: Pavement deflection; Recycled pavements
• Subject Areas: Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 00457917
• Record Type: Publication
• Source Agency: Federal Highway Administration
• Report/Paper Numbers: FHWA/CA/TL-85/01, 57324-633273
• Contract Numbers: F79TL05
• Files: TRIS, USDOT, STATEDOT
• Created Date: Sep 30 1986 12:00AM