AASHTO R 98-20 PDF Download

AASHTO R 98-20 outlines the procedure for measuring and determining the size and shape of translucent glass beads used in traffic markings. This standard adopts a computerized optical method, which ensures accuracy and precision in the measurement process.

The standard specifies that the glass beads to be tested should fall within the diameter range of 0.15 mm to 2.35 mm. This size range covers the typical size distribution of glass beads used in traffic markings. The computerized optical method allows for efficient and reliable measurement, enhancing the quality control process for these beads.

By utilizing computerized optical equipment, the standard ensures consistency and repeatability in the measurement process. This method also provides detailed data on the shape of the glass beads, allowing for a thorough assessment of their physical characteristics.