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- 2013433192 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%.".
- 2013433192 contributor B12814962.
- 2013433192 contributor B12814963.
- 2013433192 created "2012]".
- 2013433192 date "2012".
- 2013433192 date "2012]".
- 2013433192 dateCopyrighted "2012]".
- 2013433192 description "Includes bibliographical references (p. 54-56). 31".
- 2013433192 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%.".
- 2013433192 description "Sponsored by the Ohio Dept. of Transportation; State job no. 134330".
- 2013433192 extent "97 p. :".
- 2013433192 hasFormat "Also available online.".
- 2013433192 identifier 134330_FR.pdf.
- 2013433192 identifier viewonline.
- 2013433192 identifier 134330_FR.pdf.
- 2013433192 isFormatOf "Also available online.".
- 2013433192 issued "2012".
- 2013433192 issued "2012]".
- 2013433192 language "eng".
- 2013433192 publisher "Cincinnati, OH : Infrastructure Management and Engineering ; [Springfield, Va. : Available through the National Technical Information Service,".
- 2013433192 relation "Also available online.".
- 2013433192 subject "Aggregates (Building materials) Grading.".
- 2013433192 subject "Gradation analysis Sieve analysis Optical devices Spherecity Angularity Computerized particle analyzer".
- 2013433192 subject "Optical scanners Evaluation.".
- 2013433192 subject "TA441 .R25 2012".
- 2013433192 title "A comparison of optical gradation analysis devices to current test methods : final report / Arudi Rajagopal.".
- 2013433192 type "text".