OPTICAL SIEVE COMPARATOR DEVELOPMENT PROJECT
For many years, various apparatus and methods have been used for the expressed purpose of measuring and certifying the mesh conformance of fine sieves - primarily those sieves used by various highway agenices for the determination of aggregate material content and consistency. Development of an Optical Sieve Comparator was undertaken by the Arizona Department of Transportation and the Optical Science Center at the University of Arizona in an effort to determine a practical and accurate method for the measurement and certification of sieve conformance to AASHTO M-92 specifications. The described comparator has proven highly successful in principle, as well as implementation. The comparator features: (1) Measurement of a wide range of mesh sizes (3/8" to No. 400); (2) GO/NO GO sampling for spotcheck statistical certification; (3) Absolute measurement; (4) Simple calibration procedures; (5) Variable optical path distance for wide range magnification; (6) Folded optical path; (7) Visual resolution and repeatability to 1.5 microns; (8) Individual precison viewing reticles for each sieve mesh size; (9) Rapid and convenient operation.
- Funded by the Federal Highway Administration.
Arizona Department of Transportation206 South 17th Avenue
Phoenix, AZ United States 85007
- Poluianov, G
- Mancini, F P
- Publication Date: 1979-6
- Pagination: 80 p.
- TRT Terms: Aggregates; Measurement; Sieve analysis; Sieves; Wire mesh
- Subject Areas: Geotechnology; Highways;
- Accession Number: 00301464
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: FHWA/AZ-78/14 Final Rpt., FCP 40M2-023, FCP 40M2-923
- Files: TRIS, STATEDOT
- Created Date: Dec 19 1979 12:00AM