DEVELOPMENT OF FORMED-IN-PLACE WET REFLECTIVE PAVEMENT MARKERS
THE RESULTS ARE PRESENTED OF FIELD TESTING OF A LOW-COST PAVEMENT MARKER THAT IS VISIBLE AT NIGHT DURING RAIN AND WET PAVEMENT CONDITIONS. THIS TECHNIQUE INCORPORATES INTO ONE SYSTEM THE ABILITY TO BE APPLIED LIKE PAINT AND YET PERFORM LIKE RAISED, REFLECTORIZED MARKERS. THE SYSTEM CONSISTS OF FORMED-IN-PLACE MARKERS APPROXIMATELY 4 INCHES IN DIAMETER BY 0.25 INCHES IN HEIGHT WHICH ARE APPLIED BY A SELF- PROPELLED MACHINE. THE MACHINE EMPLOYS A CIRCULAR WIRE BRUSH TO CLEAN THE PAVEMENT SURFACE. ONTO THE CLEANED SURFACE, A PIGMENTED AND CATALYZED EPOXY RESIN IS DISCHARGED AS A VISCOUS LIQUID TO FORM THE BODY OF THE MARKER. NINTEEN 0.25-IN.-DIAMETER COATED GLASS BEADS ARE DROPPED INTO THE EPOXY AND THEY SUBMERGE TO JUST OVER THEIR HORIZONTAL AXES. DEPENDING ON THE ENVIRONMENTAL CONDITIONS, THE EPOXY NORMALLY REQUIRES FROM 10 TO 20 MINUTES TO SET OR HARDEN. THE ACTION OF TRAFFIC OVER THE MARKERS REMOVES THE COATING FROM THE EXPOSED PORTION OF THE GLASS BEADS. THE COATING ON THE EMBEDDED PORTION OF THE BEADS REEMAINS IN PLACE AND SERVES TO MAKE THE BEADS HIGHLY RETROREFLECTIVE, AND THEY REMAIN SO EVEN DURING PERIODS OF PRECIFITATION. THE NEW MARKER IS NOT RECOMMENDED ON HIGHWAYS WHERE SNOW REMOVAL IS CARRIED OUT USING PRESSURE-BEARING STEEL SNOWPLOW BLADES. HOWEVER, THIS DAMAGE CAN BE CONTROLLED BY THE USE OF RUBBER-TIPPED SNOWPLOW BLADES OR THE USE OF SHOES FITTED TO THE BLADES TO RAISE THEM ABOVE THE PAVEMENT SURFACE. BEADS MADE FROM PLASTIC MAY BE A PROMISING SOLUTION TO THIS PROBLEM. CONCLUSION IS MADE THAT THE NEED FOR DELINEATION DURING PERIODS OF INCLEMENT WEATHER IS SO GREAT, AND THE COST OF THE DEVELOPED MARKERS IS SUFFICIENTLY LOW, THAT THEIR USE SHOULD BE CONSIDERED AT ALL LOCATIONS, EVEN THOSE WHERE STEEL SNOWPLOW BLADES ARE USED.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/00775614
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Supplemental Notes:
- Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved. 28 PP, 18 FIG, 7 TAB, 4 REF, 4 APP
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Authors:
- Dale, J M
- Publication Date: 1970
Media Info
- Media Type: Digital/other
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Serial:
- NCHRP Report
- Issue Number: 85
- Publisher: Transportation Research Board
- ISSN: 0077-5614
Subject/Index Terms
- TRT Terms: Epoxy resins; Equipment; Field tests; Glass; Moisture content; Plastics; Reflective signs; Road markings; Rubber; Snowplows
- Uncontrolled Terms: Wet conditions
- Old TRIS Terms: Beading; Formed-in-place; Reflector markers; Traffic marking; Traffic marking equipment
- Subject Areas: Geotechnology; Highways; Materials; Vehicles and Equipment;
Filing Info
- Accession Number: 00216978
- Record Type: Publication
- Files: TRIS, ATRI
- Created Date: Aug 3 1970 12:00AM