GLASS BEADS FOR PAVEMENT MARKING(REVISION)
REVISION OF SECTIONS 106, 627 AND 713
GLASS BEADS FOR PAVEMENT MARKING
Sections 106, 627, and 713 are hereby revised for this project as follows:
Subsection 106.11 shall include the following:
All post consumer and industrial glass beads for pavement marking shall have been manufactured from North American glass waste streams in the United States of America. The bead manufacturer shall submit a COC in accordance with subsection 106.12 confirming that North American glass
waste streams were used in the manufacture of the glass beads.
Subsection 627.03 shall include the following:
(f) Applicator Rate. Bead application vehicle shall be operated at a maximum speed of 8 miles per hour.
Subsection 627.04 shall include the following:
Glass beads shall be applied into the paint by means of a low pressure, gravity drop bead applicator. The bead applicator shall disperse the glass beads using a 360 degree dispersion pattern and a 360 degree shroud for the specified width of longitudinal pavement marking.
In subsection 627.05, seventh paragraph, delete the second sentence and replace with the following:
Glass beads shall be applied into the epoxy pavement marking by means of a low pressure, gravity drop bead applicator. The bead applicator shall disperse the glass beads using a 360 degree dispersion pattern and a 360 degree shroud for the specified width of longitudinal pavement marking.
In subsection 627.05, delete the last paragraph and replace with the following:
Epoxy pavement marking and beads shall be applied within the following limits:
Application Rate or Coverage Per Gallon of Epoxy Pavement Marking
Minimum | Maximum | |
16 mil marking | 100 sq. ft. | 110 sq. ft. |
Beads | 18 lbs. | 20 lbs. |
Subsection 627.06 (c) shall include the following:
Glass beads shall be applied into the thermoplastic pavement marking by means of a low pressure, gravity drop bead applicator. The bead applicator shall disperse the glass beads using a 360 degree dispersion pattern and a 360 degree shroud for the specified width of longitudinal pavement marking.
In subsection 713.08, delete the first and third paragraphs and replace with the following:
713.08 Glass Beads for Pavement Marking. Glass beads for pavement marking shall conform to AASHTO M 247, except for the following:
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REVISION OF SECTIONS 106, 627 AND 713
GLASS BEADS FOR PAVEMENT MARKING
(1) Gradation:
U.S. Mesh Microns % Retained
161400 0 - 10
18 100020 - 35
30 60050 - 70
50 30095 - 100
(2) Roundness: All beads must meet a minimum of 80 percent true spheres by the Office of Federal Lands Highways FLH T520.
(3) Color / Clarity: Beads shall be colorless, clear, and free of carbon residues.
(4) Refractive Index: Minimum 1.51 by oil immersion method.
(5) Air Inclusions: Less than 5 percent by visual count.
(6) Coatings: Per manufacturer’s recommendation for optimum adhesion and embedment.
(7) Chemical Resistance: Beads shall be resistant to hydrochloric acid, water, calcium chloride, and sodium sulfide as tested per methods outlined in sections 4.3.6 to 4.3.9 of the TTB Federal Spec.1325D.
(8) A minimum of 40 percent of the total weight shall be manufactured using a molten kiln direct melt method. All molten kiln direct melt glass beads shall be above the 600 µm (#30) sieve.
(9) Glass beads used for any type of pavement marking shall not contain more than 75 parts per million (ppm) Arsenic, 75 ppm Antimony and 100 ppm Lead.
Post time: Aug-27-2024