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AUTOMATED MEASUREMENT OF AGGREGATE INDICES OF SHAPE. FINAL REPORT

Aggregate angularity is a significant factor in determining pavement resistance to rutting. Determination of aggregate angularity by direct means allows a more meaningful study of the mechanisms of pavement deformation. However, direct techniques have not been developed sufficiently to allow a more advanced study of angularity effects on pavement. Utilizing modern digital imaging hardware and image analysis techniques, this project produced an automated system for measuring aggregate angularity. Combining high resolution video, image capture hardware, sample transport, and computerized analysis, an instrument was constructed and used to compare various aggregate samples. Differentiation of known good quality aggregate from poorer grades was possible. Shape indices were developed from basic linear measurements, and the Hough Transform technique. These indices appear to have value in quantifying aggregate shape, and enable the study of mechanisms of pavement deformation, and possibly the prediction of pavement longevity.

  • Record URL:
  • Corporate Authors:

    University of Arkansas, Little Rock

    2801 South University Avenue
    Little Rock, AR  United States  72204

    Federal Highway Administration

    Turner-Fairbank Highway Research Center, 6300 Georgetown Pike
    McLean, VA  United States  22101
  • Authors:
    • Wilson, J D
    • Klotz, L D
    • Nagaraj, C
  • Publication Date: 1995-12

Language

  • English

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 29 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00720252
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-RD-95-116, 3H2d3027
  • Contract Numbers: DTFH61-93-X-00034
  • Files: NTL, TRIS, USDOT
  • Created Date: Apr 22 1996 12:00AM