719THERMOPLASTIC PAVEMENT MARKING

719.01 Description. This item shall consist of furnishing and

placing thermoplastic or heat-fused, preformed ther moplastic pavement markings, including words, arrows, and emb lems, of the color and type specified, and the removal of paveme nt markings, all according to these specifications and in conformity with the dimensions and at the locations shown on the plans or as directed. The markings are to be placed under existing traffi c conditions. The work shall comply with the MUTCD except as modi fied by these specifications.

719.02 Materials. The material used shall be a product

especially compounded for traffic markings and be l isted on the Department’s Qualified Products List. Each contain er shall be clearly and adequately marked to indicate the color , weight, batch or lot number, and type of material. The material shall meet the requirements of AASHTO M 249 with the following exceptions on yellow materials: Color Specifications Color Specification Limits – Daytime Initial Chromaticity Coordinates 1 2 3 4 x y x y x y x y 0.499 0.466 0.545 0.455 0.518 0.432 0.485 0.454 Luminance Factor, Y(%) Minimum Maximum 40.0 60.0 Initial daytime color determination will be made in accordance with AASHTO T 250. Values shall be evaluated on materia l without the drop-on beads. Color Specifications Limits – Daytime Retained Chromaticity Coordinates 1 2 3 4 x y x y x y x y 0.560 0.440 0.490 0.510 0.420 0.440 0.460 0.400 Retained daytime color limits shall conform to the specifications for a minimum of ninety days for construction pavement markings and one year for all other markings. Retained readings will be determined on a beaded surface in accordance with t he requirements of ASTM E 2366. Color Specifications Limits – Nighttime Initial wit h drop-on beads Chromaticity Coordinates 1 2 3 4 x y x y x y x y 0.575 0.425 0.508 0.415 0.473 0.453 0.510 0.490 Initial nighttime color limits will be determined i n accordance with the requirements of ASTM E 2367 on a beaded surface . The pigments used for the pavement marking materia l compound shall not contain any compounds that will exceed th e values listed in the Environmental Protection Agency Code of Federal Regulations (CFR) 40, Section 261.24, Table 1. Heat-fused, pre-formed thermoplastic pavement marki ng material shall meet the requirements of AASHTO M 249 with th e exception of the relevant differences due to the material bei ng pre-formed. The material shall not break down or deteriorate if held at the plastic temperature for a period of 4 hours nor by reason of 4 re- heatings to the plastic temperature. The temperatur e-viscosity characteristics of the thermoplastic material shall remain consistent and there shall be no obvious change in the color o f the material. The material shall not deteriorate by contact with sodium chloride, calcium chloride, or other chemical forma tions on the roadway or streets, or because of the oil contact o n pavement material, or from oil droppings from traffic. After application and proper drying time, material shall show no appreciable deformation nor discoloration under loc al traffic conditions and in air or road temperatures ranging from 0° F (- 18° C) to 160° F (71° C). The material shall not s mear or spread under normal traffic conditions at temperatures bel ow 160° F (71° C). Under this specification, the term "drying time" sh all be defined as the minimum elapsed time after application when the pavement marking shall have and retain the characteristics r equired in the preceding paragraphs. In addition, the drying time shall be established by the minimum elapsed time after appli cation when traffic will leave no impression or imprint on the applied marking. The drying time shall not exceed a characteristic s traight-line curve, the limits of which are 2 minutes at 50° F (10° C) and 15 minutes at 90° F (32° C), measured at a maximum relative humid ity of 70%. The pavement markings shall maintain its original d imension and placement. The exposed surface shall be free of ta ck. Cold ductility of the material shall be such as to permit normal m ovement with the road surface without chipping or cracking. The mat erial shall not be slippery when wet and it shall not lift from the pa vement in freezing weather. The marking shall have a uniform cross section. Th e density and character of the material shall be uniform througho ut its thickness and shall be completely reflectorized both internal ly and externally. The glass beads used for the drop-on application sh all meet AASHTO M 247 with a Type I gradation and shall be s uitably treated to resist moisture and retain free flow pro perties. Beads shall not be specially treated to enhance flotation.

719.03 Construction Requirements. The thermoplastic

compound shall be screed or ribbon extruded to the pavement surface. Heat-fused, pre-formed pavement markings shall be fusible to asphalt or Portland cement concrete surfaces by means of the normal heat of a propane weed-burner type of torch or other heating device as recommended by the manufacturer. The equipment used to apply the thermoplastic compo und onto the pavement shall be suitably equipped for heating and controlling the flow of the material. The equipment shall be c onstructed to provide continuous mixing and agitation of the mate rial. The conveying parts of the equipment, between the main material reservoir and applicator, shall be so constructed a s to prevent accumulation and clogging. The equipment shall be constructed so that all mixing and conveying parts, up to and incl uding the applicator, maintain the material at the plastic te mperature. The thermoplastic material shall be dispensed at a temp erature recommended by the manufacturer. The applicator sh all include a cutoff device remotely controlled to provide clean, square stripe ends and to provide a method for applying skip line s. The thermoplastic reservoir shall be insulated and equipped with an automatic thermostatic control to maintain the p roper temperature of the material. The thermoplastic machine shall comply with the req uirements of the National Board of Fire Underwriters. Beads applied to the surface of the completed strip e shall be applied by an automatic bead dispenser attached to the pavement marking equipment in such a manner that the beads a re immediately dispensed upon the completed line. The bead dispen ser shall be equipped with an automatic cutoff control, synchron ized with the cutoff of the pavement marking equipment. The bead s shall be automatically applied at a minimum uniform rate of 8 pounds (39 kg) of glass beads to every 100 square feet (100 sq m) of surface. Heat-fused, pre-formed pavement markings shall be i nstantly highly reflective without the application of additi onal glass beads. Thermoplastic markings shall not be applied to the pavement surface when the pavement surface temperature is le ss than 50° F (10° C) or when the pavement surface shows evidence of moisture. On new concrete pavements where no pavement marking s exist or on existing concrete or asphalt pavements where the existing pavement markings are paint or thermoplastic and do not conflict with the proposed pavement markings, blasting with water or sand or a combination thereof will be required to remove any curing compound, oxidized paint or thermoplastic, or dirt to ensure a good bond. This blasting is considered surface preparat ion. On newly constructed asphalt pavements any sand, grit, or ot her surface contaminants must be removed using compressed air a nd/or sweeping. Water blasting may be necessary to remov e surface contaminants which cannot be removed by the use of compressed air and/or sweeping. This work is considered surface p reparation. Conflicting pavement markings that exist shall be r emoved by blasting with water and/or sand or by grinding. Th is blasting or grinding is considered pavement marking removal. The thickness of thermoplastic markings above the r oadway surface shall be 90 mils (2.3 mm) (a minimum of 158 4 pounds per mile [446 kg/km] of 4" [100 mm] line). The thickne ss will be measured by a device supplied by the Contractor dur ing the course of the project capable of measuring the thickness o f the marking as installed on the pavement. The minimum thickness, as required above, will be measured in the center of the line w hen gauged by the equipment described above. The minimum thickness 1 /2" (12 mm) from the edges shall not be less than 75% of the th ickness required in the center. Maximum thickness of markings is 3/ 16" (5 mm). Heat-fused, pre-formed pavement markings shall be s upplied with a minimum average thickness of 90 mils (2.3 mm ) before application on the roadway surface. On concrete pavements, paint pavement markings acco rding to Section 718 shall be applied as a primer for the th ermoplastic markings, except where thermoplastic markings are t o be applied over existing thermoplastic markings. Paint applie d to concrete pavement solely as a primer will not be measured or paid for separately, but full compensation therefor will be considered included in the contract unit prices bid for the va rious items of Thermoplastic Pavement Markings. A primer other th an paint may be used when recommended by the thermoplastic manuf acturer. A primer is not required for asphalt pavements, but paint pavement markings complying with Section 718 may be used by the Contractor as a primer at no cost to the Department . When temperature limitations prohibit placement of thermoplastic markings within the 3 or 14 day limit specified in Section 604, the Contractor shall place painted mar kings according to Section 718. Painted markings required due to t emperature limitations will be measured and paid for under Sec tion 604. In this case, the Contractor shall maintain the painted mar kings at no additional cost to the Department until the thermop lastic markings, including primer if required, are installed. Spotting the pavement for center line location on t wo-way roadways is required. It will be the responsibility of the Contractor to spot using a string line or chain so that spots are placed at intervals not exceeding 10' (3 m). The Department will establish the no passing zones if required. On one-way roadways spotting is required for the initial edge line or lane line pla ced. Edge lines and/or lane lines may be installed by referencing t o center or lane lines. Edge lines shall not be broken for driveway s. The trace of the thermoplastic line shall be uniform. The finished lines shall have well defined edges, s hall be uniform in thickness, and shall be straight and true. No s tripe shall be less than the specified width. Any corrections of varia tions in width or alignment of the stripes shall not be made abruptly . Lines that cannot be corrected to meet these requirements shal l be removed in accordance with Section 604 at the Contractor’s exp ense. Line removal as specified on the plans shall be per formed in such a manner that no conflicting pavement marking will be left in place. Removal of the pavement marking by a means that wil l gouge the surface will not be permitted. The Contractor shall use only workers experienced i n installing thermoplastic markings.

719.04 Method of Measurement. (a) Thermoplastic Pavement

Markings will be measured by the linear foot (meter ) of line of the width specified actually placed.

719.05 Basis of Payment. (a) Thermoplastic Pavement

Markings. Work completed and accepted and measured as provided above will be paid for at the contract uni t price bid per linear foot (meter) for Thermoplastic Pavement Mark ings of the width specified, which price shall be full compensa tion for furnishing and installing markings; for surface pre paration; and for all labor, equipment, tools, furnishing thickness g auge, and incidentals necessary to complete the work.

THERMOPLASTIC PAVEMENT MARKING in other states

• Ohio 644 · Thermoplastic Pavement Marking