GLASS BEADS FOR TRAFFIC PAINTS

INTERMEDIATE INDEX OF REFRACTION /1.65 PLUS/ GLASS BEADS FOR TRAFFIC PAINT WERE FIELD TESTED TO DETERMINE WHETHER THE INCREASED COST OF THESE BEADS OVER STANDARD INDEX BEADS /1.53 TO 1.65 INDEX/ WAS JUSTIFIED OF THE BASIS OF INCREASED NIGHTTIME REFLECTIVITY DURING THE LIFE OF THE STRIPE. AS A RESULT OF PHOTOMETER READINGS AND BEAD COUNTS AT THE PAINT SURFACE IN TEST AREAS ON BITUMINOUS AND PORTLAND CEMENT CONCRETE SURFACES, THE FOLLOWING CONCLUSIONS WERE DRAWN' ON PORTLAND CEMENT CONCRETE SURFACES, THE STRIPE WITH INTERMEDIATE INDEX BEADS CONSISTENTLY SHOWED GREATER REFLECTIVITY WHEN MEASURED WITH A PHOTOMETER, BUT VISUALLY THE DIFFERENCE WAS HARDLY NOTICEABLE. IT WAS CONCLUDED THAT THERE WAS NO ADVANTAGE IN SPECIFYING INTERMEDIATE INDEX BEADS OVER STANDARD INDEX BEADS BECAUSE OF ITS INCREASED COST. /BPR/

• Supplemental Notes:
  • Research RePT RR 66-4, DEC, 1966, HPR
• Corporate Authors:

  New York State Department of Public Works

  ,    
• Authors:
  • Hiss, JGF
  • McCarty, W M
• Publication Date: 0

Subject/Index Terms

• TRT Terms: Asphalt concrete; Economic analysis; Field tests; Glass; Night visibility; Photometers; Portland cement concrete; Reflectivity; Refractivity; Traffic paint
• Old TRIS Terms: Beading
• Subject Areas: Economics; Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00215852
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS, STATEDOT
• Created Date: May 25 1994 12:00AM