A comparison of optical gradation analysis devices to current test methods--phase 2.

Details

• Creators:
  Rajagopal, Arudi
• Corporate Creators:
  Infrastructure Management and Engineering Inc.
• Corporate Contributors:
  Ohio. Dept. of Transportation ; United States. Federal Highway Administration ; Ohio. Dept. of Transportation. Office of Research and Development
• Subject/TRT Terms:
  • Aggregates
  • Aggregates by gradation
  • Grading (Earthwork)
  • Optical scanners
  • Aggregates (Building materials)--Grading
  • Optical scanners--Evaluation
• Publication/ Report Number:
  FHWA/OH-2012/5
• Resource Type:
  Tech Report
• Geographical Coverage:
  Ohio
• Corporate Publisher:
  Infrastructure Management and Engineering Inc.
• Abstract:
  Optical devices are being developed to deliver accurate size and shape of aggregate particles with, less labor, less consistency error, ; and greater reliability. This study was initiated to review the existing technology, and generate basic data to determine when and ; where such devices are appropriate from the standpoint of both economies and performance. The study was taken up in two phases. ; Phase-1 incorporated a review of the existing devices for gradation analysis. Following a review of available optical devices, an ; optical device called Computerized Particle Analyzer (CPA) was selected for laboratory evaluation to determine its suitability for ; gradation analysis. This device examines particles as they freely fall in front of a light source, while a camera capable of making ; 10,000 scans per second captures 2-D images. Aggregate samples were collected from 46 different sources in Ohio. These sources ; included various sizes of lime stone and gravel with varying amounts of crushed faces. Gradation tests were first performed ; according to standard ASTM/AASHTO procedures. The samples were then tested in CPA. The results of the tests showed that the ; maximum difference between the test results was less than 1%.
• Format:
  PDF
• Funding:
  134330
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24288/dot_24288_DS1.pdf
• File Type:
  [PDF - 1.37 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:eaaba54570b9b54ec0d833f5e57f0840f97bcb587a91f5f62d0b7d7b8259d091792d9e8151c56f1e20db80e77183429cf7ee22194da9f7bd1ad51209e40e498f