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

National Academies of Sciences, Engineering, and Medicine

doi:10.17226/22927

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

(2010)

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TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 156: Optical Sizing and Roundness Determination of Glass Beads Used in Traffic Markings is the final report on 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.

A summary of the project was published as NCHRP Research Results Digest 346.

Contributor(s): National Academies of Sciences, Engineering, and Medicine; Transportation Research Board; National Cooperative Highway Research Program

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Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2010. Optical Sizing and Roundness Determination of Glass Beads Used in Traffic Markings. Washington, DC: The National Academies Press. https://doi.org/10.17226/22927.

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Publication Info

8.5 x 11 | DOI: https://doi.org/10.17226/22927

Chapters		skim
Front Matter	i-vii
Report Contents	1-2
Acknowledgments	3-3
Chapter 1: Introduction and Research Approach	4-5
Chapter 2: Design and Conduct of the ILS	6-11
Chapter 3: Interlaboratory Test Results and Analysis	12-44
Chapter 4: X-ray Tomography Scans of the Glass Beads	45-88
Chapter 5: Conclusions and Recommendations	89-92
References	93-94
Appendix A: Instructions and Data Sheet for Interlaboratory Study	95-120
Appendix B: Results of Percent Retained by Mechanical Sieve	121-127
Appendix C: Results of Roundometer	128-134
Appendix D: Results of Percent Retained Using COM-A	135-141
Appendix E: Results of SPHT Roundness by COM-A	142-148
Appendix F: Results of B/L Roundness by COM-A	149-155
Appendix G: Results of Size Measurements by COM-B	156-159
Appendix H: Results of Roundness by COM-B	160-163
Appendix I: Recommended Test Method for Measurement of Size Distribution and Roundness of Glass Beads Using Computerized Optical Equipment	164-175

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