NCHRP Research Results Digest 346:

Optical Sizing and Roundness Determination of Glass Beads Used in Traffic Markings: A Summary

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Size: 36 pages, 8.5 x 11

Publication Year:2010

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Authors:
Haleh Azari; Edward Garboczi; Transportation Research Board
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TRB's National Cooperative Highway Research Program (NCHRP) Research Results Digest 346: Optical Sizing and Roundness Determination of Glass Beads Used in Traffic Markings summarizes the results of a project that examined the precision and bias of both optical and traditional ...
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Table of Contents
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Introduction	1-1	(skim)
ILS Sample Preparation	2-2	(skim)
Test Results	3-3	(skim)
Analysis of Results from Traditional Mechanical Methods	4-6	(skim)
Analysis of Results from COM-A Measurements	7-12	(skim)
Analysis of Results from COM-B Measurements	13-15	(skim)
Size Measurements	16-17	(skim)
Roundness Measurements	18-18	(skim)
Size Measurements	19-19	(skim)
Roundness Measurement	20-21	(skim)
Conclusions	22-23	(skim)
Appendix A	24-36	(skim)

Description

TRB's National Cooperative Highway Research Program (NCHRP) Research Results Digest 346: Optical Sizing and Roundness Determination of Glass Beads Used in Traffic Markings summarizes the results of a project that examined the precision and bias of both optical and traditional mechanical methods for different glass bead types. The project also compared the precision and bias of various measurement methods, and explored development of a practice for the use of computerized optical methods and equipment to measure the size and roundness of glass beads used in traffic markings.

The final report on this project was published as NCHRP Web-Only Document 156.

NCHRP Research Results Digest 346:

Optical Sizing and Roundness Determination of Glass Beads Used in Traffic Markings: A Summary

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