SECTION 837 - EXTRUDED THERMOPLASTIC PAVEMENT MARKING MATERIALS
837.01 GENERAL. This section covers extruded thermoplastic pavement marking
materials for permanent applications.
837.02 DROP ON BEADS. Use beads that will ensure the pavement marking material
will meet retroreflectivity requirements. The Department will evaluate the beads as part of the marking system through retroreflectivity readings.
837.03 APPROVAL. Select materials that conform to the composition and physical
characteristic requirements below when evaluated in accordance with AASHTO T-250 or other test methods as cited. The Department will sample and evaluate for approval each lot of thermoplastic material delivered for use per contract prior to installation of the thermoplastic material. Do not allow the installation of thermoplastic material until it has been approved by the Division of Materials. Allow the Department a minimum of 10 working days to evaluate and approve thermoplastic material from the date received by the Division of Materials.
837.03.01 Composition. Use a maleic-modified glycerol ester resin (alkyd binder) to
formulate the thermoplastic material. Ensure the pigment, pre-mix beads, and filler are uniformly dispersed in the resin. Use material that is free from all dirt and foreign material. Annually provide independent analysis data and certification for each formulation stating the total concentration of each heavy metal present, the test method used for each determination, and compliance to 40 CFR 261 for leachable heavy metals content. COMPOSITION (Percenta ge by Wei ght) Com ponent White Yellow Binder, (1) 18.0 min. 18.0 min. Glass Beads (Premixed ) 30 - 40 30 - 40 Titanium Dioxide 10.0 min. — Calcium Carbonate & Inert Fillers (2) 42.0 max. 50.0 max. Heavy Metals Content Comply with 40 CFR 261 Comply with 40 CFR 261 (1)Use a binder that consists of a mixture of synthetic resins, at least one being solid at room temperature, and high boiling point plasticizers. Ensure that at least one-third of the binder composition is solid maleic-modified glycerol ester resin and is not less than 8 percent by weight of the entire material formulation. Do not use alkyd binder that contains petroleum based hydrocarbon resins. (2)The manufacturer may choose the amount of calcium carbonate and inert fillers, providing all other requirements of this section are met.
837.03.02 Physical Characteristics. For thermoplastic material heated for 4 hours
at 425ºF under agitation, conform to the following requirements.
A.Color . As determined with a spectrophotometer using D65 illuminant with a 45 degree entrance angle and 0 degree observation angle geometry. 837-1 CIELAB Color Coordinates Yellow White Daytime Color (CIELAB) Spectrophotometer using illuminant D65 at 45º illumination and 0º viewing with a 2º observer L* 81.76 a* 19.79 b* 89.89 Maximum allowable variation 6.0 ∆E* L* 93.51 a* -1.01 b* 0.70 Maximum allowable variation 6.0 ∆E* Nighttime Color (CIELAB) Spectrophotometer using illuminant A at 45º illumination and 0º viewing with a 2º observer L* 86.90 a* 24.80 b* 95.45 Maximum allowable variation 6.0 ∆E* L* 93.45 a* -0.79 b* 0.43 Maximum allowable variation 6.0 ∆E*
B.Flowability. Ensure that the white thermoplastic material has a maximum residue of 18 percent and the yellow thermoplastic material has a maximum residue of 21 percent.
C.Set Time. Use material that, when applied at a temperature range of 415 ± 15 ºF and thickness of 40 to 120 mils, sets to bear traffic in not more than 2 minutes when the air and road surface temperature is approximately ≥ 50 ± 3 ºF, and not more than 10 minutes when the air and road surface temperature is approximately < 50 ± 3 ºF.
C.Softening Point. Ensure that the thermoplastic material has a softening point of 215 ± 15 ºF.
C.Bond Strength . Ensure that the bond strength of the thermoplastic material to concrete exceeds 180 psi.
C.Cracking Resistance at Low Temperature. Ensure that the thermoplastic material shows no cracks when observed from a distance exceeding one foot. C) Impact Resistance. Ensure the impact resi stance of the thermoplastic material is a minimum of 1.13 joules.
C.Flash Point. Use thermoplastic material that has a flash point not less than 475 °F.
837.04 PACKAGING. Package thermoplastic material in suitable 50 pound containers to
which the material shall not adhere during shipment or storage. Include a label stating that the thermoplastic material is to be maintained with a temperature range of 400 – 440ºF during application. Provide the thermoplastic material in either block or granular form.
837.05 SHELF LIFE. Ensure that the thermoplastic material conforms to this section for
a period of one year. Replace any thermoplastic material not conforming to the above requirements.
837.06 MANUFACTURER’S TESTING. Perform testing in accordance with AASHTO
T-250 on a minimum of one composite sample per 10,000 pounds, or portion thereof, per lot of thermoplastic produced.
837.07 CERTIFICATION. Submit manufacturer’s certification stating conformance to
the requirements of this section for each lot of extruded thermoplastic delivered for use on projects. Clearly state the manufacture, form ulation identification, product name, color, date of manufacturer, lot number (s), expiration date, total quantity of lot produced, actual quantity of thermoplastic material represented, sampling method utilized to obtain the samples, and required manufacturer’s testing data for each composite sample tested to represent each lot produced.
837.08 ACCEPTANCE. The Department will accept extruded thermoplastic based
on compliance of the manufacturer’s certification and conformance of test results obtained by the Department to the requirements of this section. 837-2 SECTION 838 FLEXIBLE DELINEATOR POSTS
838.01 GENERAL. Furnish surface and ground mounted flexible delineator posts from
the Department’s List of Approved Materials. The Department considers the flexible delineator posts to include the post, reflective sheeting, and mounting hardware.
838.01.01 Retroreflective Sheeting. Conform to Section 830.
838.02 APPROVAL. The Department will approve flexible delineator posts which are
in conformance to this Section
838.03 PACKAGING. Securely fasten posts of the same type and length in bundles of
2,000 pounds or less in a manner that is easily handled by a fork lift and that prevents slipping during handling and shipping. The Engineer will reject posts with excessively damaged finishes.
838.04 CERTIFICATION. Submit manufacturer’s certification stating
conformance to the requirements of this section for each shipment of approved flexible delineator posts delivered for use on projects. Clearly st ate the manufacturer, product name, product code, and type (surface mount or ground mount) as listed in the Department’s List of Approved Material s. Identify the lot number(s) and quantity of flexible delineator posts delivered.
838.05 ACCEPTANCE. The Department will accept flexible delineator posts
based on verification of inclusion on the Department’s List of Approved Materials and compliance of the manufacturer’s certification. 838-1
Source: Kentucky Standard Specifications for Road and Bridge Construction, 2019 Edition. Pages 667–668 of 718.