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

TRT Terms: Aggregates by shape and surface texture; Angularity; Automation; Hough transforms; Image processing; Instrumentation
Candidate Terms: Imaging systems
Uncontrolled Terms: Aggregate shape; Video technology
Subject Areas: Geotechnology; Highways; I36: Aggregates;

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