ASTM D7681 involves the Usage of Flowing Stream Digital Analyzer, which determines the gradation (size distribution) of glass spheres used in pavement marking systems. The SI units should be considered as standard.
Scope:
ASTM D7681 test technique determines the gradation (size distribution) of glass beads used in pavement marking applications. Glass beads significantly influence the retroreflective effectiveness of a pavement marking system.
Procedure:
A flowing stream digital image analyzer examines the glass particles for image processing and photo-optical single particle counting technology. The amount of material to be measured is determined by the grain size and the metering feeder’s breadth. Typical measurement periods range from 2 to 10 minutes.
Specimen size:
A minimum of 50 ± 5 g of glass beads specimens are examined for gradation (size).
Data:
The measured result is accessible a few seconds after the measurement is finished and may be presented in a variety of ways and printed and stored using a computer.
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