ITEM 647  HEAT-FUSED PREFORMED PLASTIC PAVEMENT MARKING

647.01   Description
647.02   Materials
647.03   Equipment
647.04   Application
647.05   Basis of Payment

647.01  Description.  This work consists of furnishing and applying heat-fused preformed plastic for use as auxiliary pavement markings according to Item 641 and the additional requirements specified below.

647.02  Materials.  Furnish materials from the Department’s Prequalified List conforming to:

647.03  Equipment.  Use manufacturer recommended equipment to apply the heat-fused preformed plastic pavement marking material.  Furnish equipment according to the appropriate type as follows:

A.     Type A Material.

1.      Propane torch to heat the pavement and material to the manufacturer’s specifications.
2.      Infrared thermometer to assure that both the pavement and the material are properly heated and do not exceed the manufacturer’s specified application temperature.

B.     Type B or Type C Material.

1.      Propane torch for removing moisture from the pavement and heating the material according to 647.04.C.
2.      An infrared thermometer is not required.

647.04  Application.

A.     General.  Apply the heat-fused preformed plastic pavement marking material to clean, dry pavement surfaces according to the manufacturer’s recommendations.  Apply primer sealer on portland cement concrete pavements for proper adhesion only if the manufacturer requires its use.

Form lines 12 inches (300 mm) wide or less by one piece; form lines wider than 12 inches (300 mm) by no more than two pieces.  Do not overlap individual pieces.  Do not allow a gap greater than 1/4-inch (6 mm) between pieces.

Apply preformed material according to the appropriate type of application as follows unless otherwise directed by the manufacturer’s recommendation:

B.     Type A (90-mil thickness) Material Application on Asphalt Concrete and Portland Cement Concrete Pavements.  uniformly pre-heat the pavement to 350 °F (177 °C) with a propane torch.  Place the material on the warm surface as soon as practical, then uniformly post-heated it to 400 °F (205 °C).  Begin the post-heating process of material application as quickly as possible.  The Contractor may have to extended post-heating on concrete having a high moisture content.  Allow the material to cool naturally and solidify before exposing it to traffic.

Type A material shall contain intermix glass beads throughout.  Drop-on glass beads are not required.

C.     Type B and Type C (125-mil thickness) Material Application on Asphalt Concrete and Portland Cement Concrete Pavements.  Heat the pavement only to the extent necessary to remove moisture.  Place the material on the dried surface at ambient temperature, then uniformly heat the placed material until it bubbles and changes color to off-white.  Allow the material to cool naturally and solidify before exposing it to traffic.

1.      Type B Material.  Apply drop-on glass beads to the surface at the rate and within the temperature range recommended by the manufacturer.

2.      Type C Material.  Drop-on glass beads are not required.

647.05  Basis of Payment.  The Department will pay for accepted quantities at the contract prices, or prices adjusted according to 641.11, measured according to 641.12, with the provisions specified in 641.13, and as follows: