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A comparison of optical gradation analysis devices to current test methods--phase 2.
  • Published Date:
    2012-04-01
  • Language:
    English
Filetype[PDF-1.37 MB]


Details:
  • Corporate Creators:
    Infrastructure Management and Engineering Inc.
  • Report Number:
    FHWA/OH-2012/5
  • Resource Type:
  • Geographical Coverage:
    Ohio
  • OCLC Number:
    793546144
  • Corporate Publisher:
    Infrastructure Management and Engineering Inc.
  • NTL Classification:
    NTL-HIGHWAY/ROAD TRANSPORTATION-Materials ; NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance ; NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance
  • Format:
    PDF
  • Description:
    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%.

  • Funding:
    134330
  • Supporting Files:
    No Additional Files
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