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The National Academies

NCHRP 20-07/Task 364 [Completed]

Revision of AASHTO PP-74 Test Method for Optical Sizing and Roundness Determination of Glass Beads Utilized in Traffic Markings
[ NCHRP 20-07 (Research for AASHTO Standing Committee on Highways) ]

  Project Data
Funds: $100,000
Research Agency: Pavement Systems, LLC
Principal Investigator: Haleh Azari
Effective Date: 3/30/2015
Completion Date: 12/31/2016

The objective of this study was to revise AASHTO PP 74 to be applicable for use with optical computerized particle analyzers entered into the market since the development of the test method in 2011. The precision estimates of the test were updated by including the measurements made with the new equipment. The project final report was submitted to the AASHTO Subcommittee on Materials for review and possible action. Click on the following link to access the project final report:

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