ITEM 643  POLYESTER PAVEMENT MARKING

643.01   Description
643.02   Materials
643.03   Equipment
643.04   Application
643.05   Basis of Payment

643.01  Description.  This work consists of furnishing and applying polyester pavement markings according to Items 641, 740.03, 740.09, and the additional requirements specified below.

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

643.03  Equipment.  Use application equipment capable of mixing the polyester components in proportions recommended by the manufacturer and applying glass beads at the time of marking placement.  Use equipment (striper) capable of applying polyester long-lines at the thickness specified for solid and dashed lines while moving on the highway at a speed of not less than 7 miles per hour (11 km/h).  Furnish a calibrated measuring device acceptable to the Engineer to measure the polyester resin in the striper tanks.

643.04  Application.  Apply polyester only when the pavement surface is clean and dry and the pavement and air temperature are above 50 °F (10 °C).  Transfer the entire contents of each material container to the striper tanks.  Ensure that the polyester is thoroughly mixed at all times during application.  Apply polyester (catalyst plus resin) uniformly to the pavement at the following rates:

Do not dilute the material.

Apply glass beads to the uncured polyester in sufficient quantity so that the beads completely fill the polyester film from the film-pavement interface to the top surface of the film to the extent that there are loose beads on the surface of the uncured line.  Apply the glass beads at a rate of at least 18 pounds (2.2 kg) of glass beads per gallon (L) of polyester applied.

If the applied polyester becomes tacky and causes marking discoloration and darkening, cease marking application until the Inspector agrees that the problem is corrected.

If any marking is in a tracking condition 45 minutes after application, cease marking application until the Inspector agrees that the problem is corrected.

Do not apply polyester pavement markings to new asphalt concrete until at least 2 weeks after the pavement is placed.

Apply, at the rates stated in 643.04, additional polyester and beads to markings that were found to be more than 20 percent deficient.

643.05  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: