MIXING EFFICIENCY OF RECYCLED ASPHALT PAVING MIXTURES

This report covers an extensive evaluation of a range of ideas for measuring the degree of mixing during the recycling of old asphalt pavements. The practice of using small amounts of rejuvenating or recycling agents is coupled with the problem of quality control. No suitable method exists that permits detecting how well the recycling agent (or, in some cases, virgin asphalt) mixes with the aged pavement materials. Usual quality control tests such as extracting and measuring the binder content and properties are not appropriate since these tests made the presence of recycling agents and extent of mixing. The project was aimed at development of a test method that could be conducted in the field with a minimum of equipment and training. Among the more traditional tests, the resilient modulus (MR) was found to be most suitable for physical testing of the recycled mixtures. The method might be used to determine the relative quantity of recycling agent used, since it is sensitive to small changes. However, a quick test for measuring the efficiency of mixing, it shows little promise.

• Corporate Authors:

  University of Washington, Seattle

  Seattle, WA  United States  98195

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Terrel, R L
  • Lee, T C
  • Mahoney, J P
• Publication Date: 1981-12

Media Info

• Pagination: 241 p.

Subject/Index Terms

• TRT Terms: Dyes; Economic efficiency; Flexible pavements; Mixtures; Nondestructive tests
• Uncontrolled Terms: Efficiency
• Old TRIS Terms: Dyeing
• Subject Areas: Economics; Highways;

Filing Info

• Accession Number: 00365509
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: FHWA/RD-81/174
• Contract Numbers: DOT-FH-11-9501
• Files: NTIS, USDOT
• Created Date: Oct 30 2003 12:00AM