644Thermoplastic Pavement Marking

644.01 Description. This work consists of furnishing and applying screed extruded or ribbon

gun thermoplastic pavement markings according to Item 641, 740.01, 740.04, 740.09, and the additional requirements specified below.

644.02 Materials. Furnish materials conforming to:

Thermoplastic pavement marking .... 740.04 Glass beads, Type C ......................... 740.09 The Engineer may obtain random samples from the application equipment in accordance with Supplement 1089 . Furnish the manufacturer’s identification information for the sampled liquid materials. The Department will test the quality assurance sample for conformance to the manufacturer’s production ranges. Samples not meeting the manufacturer’s production range s will require the Contractor to re-apply, at his expense, any markings using that sample. All other untested batches will become not approved materials and will either require testing or re-application. Do not apply material that has exceeded the manufacturer’s shelf life. Do not use glass beads that are wet.

644.03 Equipment. When using thermoplastic pavement marking trucks, equip all thermoplastic

pavement marking trucks for center line, lane line and edge line markings with a computerized Data Logging System (DLS) conforming to 641.04 when the length of marking exceeds 0.5 mile (0.8 km) of continuous line equivalent. A DLS is not required for markings applied with hand carts. Ensure that the application equipment applies lines with a square end and can apply broken lines. Furnish application equipment for applying markings that consists of dies of varying widths to produce different widths of lines. Do not use pans, aprons, or similar devices that the die overruns. Use equipment that ensures uniformity in the thickness and width of lines. Use equipment that forms lines 12 inches (300 mm) wide or less by one application pass, and lines wider than 12 inches (300 mm) by no more than two passes. Do not allow individual passes to overlap or to be separated by a gap greater than 1/4 inch (6 mm).

644.04 Application. If applying thermoplastic to pavements that are less than six months old,

ensure that both the pavement surface and the ambient air temperature at the time of application are not less than 50 F (10 C) and rising. However, if applying thermoplastic to pavements that are older than six months, ensure that both the pavement surface and the ambient air temperature at the time of application are not less than 70 °F (21 °C) and rising. Ensure that the temp erature of thermoplastic at the point of application is at least 400 F (204 C) and not more than 440 F (227 C). Apply thermoplastic at a thickness of 125 mils (3.2 mm). Thermoplastic for small quantities or auxiliary markings up to 100 feet (30 m) in length can be exchanged as equal in function and price with 125 mil (3.2 mm) thick heat-fused preformed thermoplastic (Item 647). Apply thermoplastic at the following rates: 125 Mil Thickness Line Width (inch) 4 6 8 12 24 Pounds per Mile of Line Solid Line 2340 3510 4680 7020 14040 Broken Line 585 878 1170 1755 3510 Dotted Line 585 878 1170 1755 3510 Areas, Symbols, Words 133 pounds per 100 square feet 3.2 mm Thickness Line Width (mm) 100 150 200 300 600 Kilograms per Kilometer of Line Solid Line 650 975 1300 1950 3900 Broken Line 165 245 325 490 975 Dotted Line 165 245 325 490 975 Areas, Symbols, Words 6.5 kg/m² Mechanically apply glass beads to the wet thermoplastic surface so that the beads are embedded and retained and provide uniform retroreflectivity in the surface. Do not place beads by hand, except to symbols and words, and to complete the ends of lines. Ap ply beads at a minimum rate of 12 pounds per 100 square feet (6 kg per 10 m²) of thermoplastic surface area. The Contractor may leave small gaps unfilled in symbols and letters resulting from template use. If required, furnish primer, and apply it according to the manufacturer’s recommendations. Use primer except on new asphalt pavement. For each route section on the DLS report, the Engineer will compute the amount of thermoplastic marking material and glass beads applied. The Department will reduce the contract price in direct proportion to the percent of deficiency of thermoplastic marking material or glass beads as specified in 644.04, up to 20 percent for each material deficiency. The Department will only use the greater deficiency of marking material or glass beads to compute the deduction. The Department will consider materials unsatisfactory if at least one of the following conditions is met:

644.05 Layout and Premarking. In addition to the requirements specified in 641.06, only place

auxiliary markings on new pavement. The Contractor may place initial thermoplastic markings over work zone traffic paint markings.

644.06 Basis of Payment. The Department will not pay for any thermoplastic lines that do not

meet the required thickness. The Department will pay for accepted quantities at the contract prices, or prices adjusted according to 644.04, measured according to 641.12, with the provisions specified in 641.13, and as follows: Item Unit Description 644 Mile (Kilometer) Edge Line, ___ inch (___ mm) 644 Mile (Kilometer) Lane Line, ___ inch (___ mm) 644 Mile (Kilometer) Center Line 644 Mile (Kilometer) Channelizing Line, ___ inch (___ mm) 644 Foot (Meter) Stop Line 644 Foot (Meter) Yield Line 644 Foot (Meter) Crosswalk Line 644 Foot (Meter) Transverse/Diagonal Line 644 Each Handicap Symbol Marking 644 Each Railroad Symbol Marking, ___ inch (___ mm) 644 Each School Symbol Marking, __ inch (___ mm) 644 Each Bicycle Lane Marking Symbol 644 Each Shared Lane Marking 644 Foot (Meter) Parking Lot Stall Marking 644 Each Lane Arrow 644 Each Two Way Left Turn Arrow 644 Each Word on Pavement, ___ inch (___ mm) 644 Foot (Meter) Dotted Line, ___ inch (___ mm) 644 Foot or Removal of Pavement Marking Square Foot (Meter or Square Meter), or Each 644 Lump Sum Two-Way Radio Equipment

Thermoplastic Pavement Marking in other states

• Arkansas 719 · THERMOPLASTIC PAVEMENT MARKING