SECTION 839 - KY TYPE I GLASS BEADS
839.01 GLASS BEADS. Use for application to reflective pavement markings. Conform
to AASHTO M 247, moisture resistant specifications with the following additional requirements for gradation and percentage of rounds: Gradation: Sieve Size Percent Passing No. 20 98-100 No. 30 70-90 No. 40 — No. 50 0-20 No. 80 0-5 Rounds: 70% minimum for + 50 beads
839.01.01 Sampling. The Department will obtain random samples of all shipments
that are intended for use by State Traffic Forces at the point of delivery. The Department will evaluate the beads for acceptance prior to use.
839.01.02 Composition. Manu facturers must provide certification stating compliance
to Section 1504 of MAP 21.
839.01.03 Testing. The Department will test according to AASHTO M 247 and the
following.
A.Chemical Resistance Test. Place three, 0.1 to 0.2-oun ce, samples of the beads in separate Pyrex-glass beakers or porcelain dishes. Cover one sample with distilled water; one with a 3N solution of sulfuric acid; and one with a 50 percent solution of sodium sulfide. Examine the samples microscopically after one hour of immersion. Reject the beads if they darken or “frost”.
A.Moisture Resistance Test. Place approximately 2 pounds of glass beads in a clean cotton bag not treated with sizing material. Immerse the bag in water, completely covering the beads, for approximately 30 seconds. Remove the bag and wring free of excess water. Hang the bag in room air for 2 hours to dry. Transfer the beads slowly to a clean, dry, standard (4-inch stem, and a 1/4-inch diameter exit) glass funnel. Accept beads that flow freely through the funnel.
839.01.04 Approval. The Department will notify the vendor of acceptance when all
testing is complete. The Department will evaluate beads used by the Contractor as part of the installed pavement marking in accordance with KM 64-201, KM 64-202, or KM 64-203 as applicable. 839-1 SECTION 840 PAVEMENT MARKERS
840.01 DESCRIPTION. This section covers the material requirements for snow-
plowable raised pavement markers, inlaid pavement markers, replacement lenses, and temporary surface-mounted raised pavement markers. 840.02 GENERAL. Use pavement markers conforming to the following types.
840.02.01 Type IV Markers. Type IV markers are lenses (mono or bi-
directional) installed in grooves of inlaid markers and replacement lenses installed in Type V marker castings.
840.02.02 Type V Markers. Type V markers consist of an iron casting with a
Type IV marker (mono or bi-directional) attached.
840.02.03 Type IVA Markers. Type IVA markers are surface-mounted lenses
(mono or bi-directional) for temporary use in work zones. 840.03 APPROVAL. The Department will approve pavement markers based on conformance to KM 64-206 and the requirements of this section.
840.04 PACKAGING. Suitably and substantially package all materials with the name
and address of the manufacturer and vendor, cont ract or purchase number, kind of material, trade name, and net contents plainly marked on each package.
840.05 CERTIFICATION. Submit a manufacturer’s certification stating conformance
to the requirements of this section for each shipment of pavement markers delivered for use on projects. Clearly state the manufacturer, product name, product code, type, and color as listed in the Department’s List of Approved Materials. Identify the lot number(s) and quantity of pavement markers delivered. Provide a certification from the adhesive manufacturer stating the adhesive conforms to the requirements of the marker manufacturer and the minimum application temperature at which the adhesive can be successfully applied. Identify the lot number(s) and expiration date of the adhesive.
840.06 ACCEPTANCE. The Department will accept pavement markers based on
verification of inclusion on the Department’s List of Approved Materials and compliance of the manufacturer’s certification. The Department will accept adhesive based on the compliance of the manufacturer’s certification and verification that the adhesive has not exceeded its expiration date. 840-1
Source: Kentucky Standard Specifications for Road and Bridge Construction, 2019 Edition. Pages 670–670 of 718.