965PREFORMED THERMOPLASTIC PAVEMENT MARKINGS

965.1DESCRIPTION—This work is the furnishing and installation of preformed thermoplastic pavement

markings, of the type and color indicated.

965.2MATERIAL—

Section 106.03(b)3.

a material listed in Bulletin 15 . Furnish a material with a minimum initial skid resistance of 50 British Pendulum Number (BPN) for all crosswalks, stop lines, legends, or where indicated.

weight and have a minimum of 80% rounds overall.

a minimum of 70% rounds per sieve and a minimum or 80% rounds overall.

965.3CONSTRUCTION—

operations. In addition, provide the Inspector -in-Charge with the manufacturer’s instructions for the installation of the materials, application temperatures, proper mixing techniques, and any other data to ensure the material is being properly installed.

the pretreatment according to Bulletin 15 or recommended by the manufacturer. Clean the roadway surface where the preformed thermoplastic pavement markings will be applied. Remove all surface treatment, laitance, curing compound, or any contaminants that would hinder adhesion. Clear any loose dirt and other debris from the applicati on area. Surface preparation is incidental to the application of preforme d thermoplastic pavement markings, except for the removal of pavement markings which is performed and paid for under Section 963. Identify the location of the final pavement markings by applying spots on the pavement at 40-foot intervals. The Inspector-in-Charge will approve the locations. Apply on dry pavement when the air and roadway temperatures are within the manufacturer’s recommendations and when the wind speed is less than 20 miles per hours. If recommended by the manufacturer, preheat the surface to remove any moisture.

± 1/4 inch from the indicated width will be allowed provided the variation is gradual and does not detract from the general appearance. Use a heat gun to fuse the material to the pavement. Heat the material as recommended by the manufacturer.

application of the markings. Uniformly distribute glass beads on the surface. Provide markings with an average minimum initial retroreflectivity of 300 mcd/m2/lux for white and 250 mcd/m2/lux for yellow. Under the direction and supervision of the Representative measure retroreflectivity with a 30-meter geometry retroreflectometer conforming to ASTM E1710 within 21 days after installation in accordance with PTM No. 431.

which after application and drying, are determined to be defective by the Inspector -in-Charge. Complete

this work at no additional cost to the Department. Major problem areas and method of repair include the following:

• Insufficient thickness or line width, uneven cross-section. Prepare defective material by grinding or blast cleaning to remove a substantial amount of beads and the marking surface is roughened. Remove loose particles and debris with compressed air. Restripe the cleaned surface as specified in this specification.

• Inadequate retroreflectivity, glass bead coverage or retention. Remove defective markings and clean pavement surface, including 1 foot beyond each end of the affected area. Remove loose particles and debris with compressed air. Restripe the marking on the cleaned surface as specified in this specification.

to location or has not remained effective in performing useful service as specified in Section 107.16(b) for a period of 180 days from the date of acceptance. The minimum acceptable service is as follows:

• Longitudinal Markings. 90% of material remains in each 1,000 -foot section of marking where the intersection unit is defined as material on an approach leg within 160 feet of the intersection.

• Transverse Markings, Legends, and Symbols. 90% of material remains for each individual legend, symbol, crosswalk, or stop line.

965.4MEASUREMENT AND PAYMENT—