SS234-002020-01.docx
DOCX document 33 KB Posted
- Attached to
- Construction, University Drive Bike Lanes
- Solicitation number
- IFB-114424
- Issued by
- Fairfax County, Virginia
About this file
This is a supplemental specifications document issued by the Virginia Department of Transportation (VDOT) on May 6, 2022, establishing material requirements for glass beads and retroreflective optics used in traffic-marking applications. The specification covers the composition, testing standards, and quality requirements for glass beads and retroreflective optical materials that are applied to or incorporated into pavement markings to create retroreflective surfaces. Glass beads must be sourced from suppliers listed on VDOT's Materials Approval List No. 76 and shall be designed for high resistance to traffic wear and weathering, with a refractive index of 1.50-1.79 when tested per AASHTO T 346, conforming to AASHTO M 247 standards with at least 80 percent of beads being round per ASTM D 1155, Procedure B. Retroreflective optics must have a refractive index of 1.8 or higher and may consist of glass beads, ceramic materials, or combinations thereof affixed to a glass bead core.
Contractors are required to provide written certification that each batch of glass beads or retroreflective optics meets VDOT specifications and does not exceed AASHTO M 247 maximum concentration limits for lead and arsenic. Alternative bead materials other than glass are permitted if the pavement marking product was previously tested on the NTPEP test deck with those materials. No pricing, set-asides, renewal options, or contract term information is specified in this supplemental specifications document, as it functions as a technical standards reference rather than a solicitation or contract award notice.
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Text version
SS234-002020-01 May 6, 2022
VIRGINIA DEPARTMENT OF TRANSPORTATION
2020 ROAD AND BRIDGE SUPPLEMENTAL SPECIFICATIONS
SECTION 234 – GLASS BEADS AND RETROREFLECTIVE OPTICS
SECTION 234 – GLASS BEADS FOR REFLECTORIZING TRAFFIC MARKINGS of the Specifications is replaced as follows:
SECTION 234 – GLASS BEADS AND RETROREFLECTIVE OPTICS
234.01 – Description
This specification covers glass beads and retroreflective optics applied on the surface or incorporated into traffic-marking materials so as to produce a retroreflective surface.
234.02 – Detail Requirements
Glass beads and retroreflective optics shall be supplied from a supplier listed on Materials Approval List No. 76.
The Contractor shall provide a written certification that each batch of glass beads or retroreflective optics used in or on VDOT pavement markings meets VDOT specifications and does not exceed the AASHTO M 247 maximum concentration limits for Lead and Arsenic.
(a) Glass beads shall have a composition designed to be highly resistant to traffic wear and weather. Materials other than glass will be allowed if the pavement marking product was tested on the NTPEP test deck with the alternative bead material.
Glass beads shall have a Refractive Index of 1.50-1.79 when tested as per AASHTO T 346.
Glass beads shall conform to AASHTO M 247, except that at least 80 percent of the beads shall be round when tested in accordance with ASTM D 1155, Procedure B.
(b) Retroreflective Optics shall have a concentration designed to be highly resistant to traffic wear and weather. Retroreflective Optics shall be composed of glass beads, ceramic materials, or a combination of glass beads or ceramic materials affixed to a glass bead core.
Retroreflective Optics shall have a Refractive Index of 1.8 or higher when tested as per AASHTO T 346.
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