960HOT THERMOPLASTIC PAVEMENT MARKINGS

960.1DESCRIPTION—This work is the furnishing and installation of hot thermoplastic pavement markings,

of the indicated type and color with a surface application of glass beads.

960.2MATERIAL—

Section 106.03(b)3.

weight.

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

960.3CONSTRUCTION—

pretreatment according to Bulletin 15 or recommended by the manufacturer. Clean the roadway surface where the hot thermoplastic pavement markings will be applied. Remove all surface treatment, laitance, curing compound, or any con taminants that would hinder adhesion. Clear any loose dirt and other debris from the application area. Surface preparation is incidental to the application of hot 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 I nspector-in-Charge will approve the locations. Apply on dry pavement when the air and roadway temperatures are between 50F and 90F and when the wind speed is less than 20 miles per hour.

of ± 1/4 inch from the specified width will be allowed provided the variation is gradual and does not detract from the general appearance. For skip line patterns maintain a tolerance of ± 6 inches for each 40 -foot cycle and ± 3 inches for each 10-foot skip line.

of 10 pounds per 100 square feet of markings. Uniformly distribute glass beads on the surface. Provide markings with an average minimum initial retroreflectivity of 300 mcd/m 2/lux for white and 250 mcd/m 2/lux for yellow . Under the direction and supervision of the Representative, m easure retroreflectivity with a 30 meter geometry retroreflectometer, conforming to ASTM E1710 within 21 days after installation in accordance with PTM No. 431.

markings, 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 a nd 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 number of beads and the marking surface is roughened. Remove loose particles and debris with compressed air. Restripe the cleaned surface as specified in Sections 960.3(b) and (c).

• 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 Sections 960.3(b) and (c).

conformity to location or has not remained effective in performing useful service in accordance with Section

107.16(b) for a period of 180 days from the date of acceptance. The minimum acceptable service is as follows:

• Longitudinal Markings. Ninety percent 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. Ninety percent of material remains for each individual legend, symbol, crosswalk, or stop line.

960.4MEASUREMENT AND PAYMENT—