Reflecctive-road marking beads
AASHTO M247
BS 6088 Class A , BS 6088 Class B
EN1423 drop on Glass Beads and anti-skidding materials
EN1424 Intermix Glass Beads
NBR6831 Glass Beads...
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PAVEMENT MARKING FIELD GUIDE
QUALITY INSTALLATION & INSPECTION OF Glass Beads
TABLE OF CONTENTS
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I. INTRODUCTION................................................................................. |
Page 1 |
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II. Glass Beads & RETRO-REFLECTIVITY....................................... |
Page 2 |
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A. Glass Beads................................................................................. |
Page 2 |
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B. Measuring Reflectivity................................................................. |
Page 2 |
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C. Wet / Night Visibility..................................................................... |
Page 3 |
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D. Factors That Affect Retro-reflectivity......................................... |
Page 3 |
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1. |
Bead Coverage........................................................................ |
Page 3 |
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2. |
Gradation................................................................................. |
Page 3 |
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3. |
Color and Clarity...................................................................... |
Page 3 |
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4. |
Roundness............................................................................... |
Page 3 |
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5. |
Binder Color & Quality............................................................ |
Page 3 |
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6. |
Embedment............................................................................. |
Page 4 |
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a) Viscosity............................................................................. |
P.a ge 4 |
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b) Coatings............................................................................. |
Page 4 |
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c) Bead Size............................................................................ |
Page 4 |
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d) Temperature....................................................................... |
Page 4 |
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7. |
Refractive Index...................................................................... |
Page 4 |
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III. GLASS BEAD COATINGS................................................................. |
Page 5 |
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IV. HANDLING AND STORING GLASS BEADS.................................... |
Page 5 |
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V. QUALITY CONTROL & APPLICATION RECOMMENDATIONS....... |
Page 5 |
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A. Location and Application Conditions........................................ |
Page 5 |
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B. Choosing Your Application Requirements................................ |
Page 6 |
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C. Equipment Checklist................................................................... |
Page 6 |
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D. Calibrating and Determine Proper Mil Thickness.... ................ |
Page 6 |
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E. Quality of Line.............................................................................. |
Page 7 |
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1. |
Applying Test Line with Glass Beads.................................... |
Page 7 |
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2. |
Glass Bead Adhesion Spot Test............................................ |
Page 8 |
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F. Quality Control During The Application...................................... |
Page 8 |
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VI. TROUBLE SHOOTING TABLE.......................................................... |
Page 9 |
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VII. TERMS & DEFINITIONS....................................................................Page 10
