A Comparison of Optical Gradation Analysis Devices to Current Test Methods; Phase 1: Final Report

Rajagopal, Arudi; Infrastructure Management and Engineering Inc.

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A Comparison of Optical Gradation Analysis Devices to Current Test Methods; Phase 1: Final Report

2006-10-01
By Rajagopal, Arudi

[PDF-452.33 KB]

English

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Details:

Creators:

Rajagopal, Arudi
Corporate Creators:

Infrastructure Management and Engineering Inc.
Corporate Contributors:

Ohio. Dept. of Transportation ; United States. Federal Highway Administration. Office of Research and Development

Ohio. Dept. of Transportation ; United States. Federal Highway Administration. Office of Research and Development Less -
Subject/TRT Terms:

[+]

Aggregate Gradation Aggregates Angularity Cameras Computerized Particle Analyzer Elongation Index Geotechnology Gravel Highways I36: Aggregates Image Analysis Limestone Optical Devices Sieve Analysis Time Savings User Interfaces (Computer Science)
Publication/ Report Number:

FHWA/OH-2006/23
Resource Type:

Tech Report
Geographical Coverage:

United States ; Ohio

United States ; Ohio Less -
TRIS Online Accession Number:

1046403
Edition:

Final Report
Corporate Publisher:

Infrastructure Management and Engineering Inc. ; United States. Federal Highway Administration

Infrastructure Management and Engineering Inc. ; United States. Federal Highway Administration Less -
Abstract:

Optical devices for gradation analysis are being developed to deliver accurate gradation results with, less labor, less consistency error, and greater reliability. The goal of this study was to conduct a review and develop comprehensive understanding of the existing technology for gradation analysis, and generate basic data to determine when and where such devices are appropriate from the standpoint of both economies and performance. 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 has been designed to examine particles as they freely fall in front of a light source, while a sophisticated camera capable of making 10,000 scans per second captures images. Aggregate samples were collected from 46 different sources in Ohio. These sources included various sizes of limestone and gravel with varying amounts of crushed faces. Gradation tests were first performed according to the standard AASHTO procedure. The samples were then tested in CPA. Preliminary test results revealed that the CPA device has the potential to produce gradation results comparable to the traditional ASTM and AASHTO procedures. The device is capable of producing consistent and repeatable test data. It is computer controlled and user-friendly. Two primary benefits noted during the evaluation are: (i) time savings, and (ii) generation of additional information. One gradation test can be completed in less than five minutes, compared to 30 to 60 minutes for the conventional procedure. More importantly, the same data can also be used to obtain additional information about elongation index and angularity. While the results so far show promise, a definitive determination of the suitability of the device for use in Ohio will require further research.
Format:

PDF
Funding:

134264
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:e599b430de9b8bce4104728bf0205a5660bd209841ee33d9a7a033fb26f4588b
Download URL:

https://rosap.ntl.bts.gov/view/dot/37638/dot_37638_DS1.pdf
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A Comparison of Optical Gradation Analysis Devices to Current Test Methods; Phase 1: Final Report

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