specs Item P specifications.pdf

Item P-620 Runway and Taxiway Painting

DESCRIPTION

620-1.1 This item shall consist of the painting of numbers, markings, and stripes on the surface of runways, taxiways, and aprons, in accordance with these specifications and at the locations shown on the plans, or as directed by the Engineer.

MATERIALS

620-2.1 MATERIALS ACCEPTANCE. The Contractor shall furnish manufacturer’s certified test reports for materials shipped to the project. The certified test reports shall include a statement that the materials meet the specification requirements. The reports can be used for material acceptance or the Engineer may perform verification testing. The reports shall not be interpreted as a basis for payment. The Contractor shall notify the Engineer upon arrival of a shipment of materials to the site.

620-2.2 PAINT. Paint shall be Waterborne in accordance with the requirements of paragraph 620-2.2 A. Paint shall be furnished in white (#37925), yellow (#33538 or 33655), and black (#37038) in accordance with Federal Standard No. 595. Paint shall be delivered in unopened, sealed containers that have the manufacturers label intact.

a. Waterborne. Paint shall meet the requirements of Federal Specification TT-P-1952E, Type I or Type II.

b. Epoxy. Not used

c. Methacrylate. Not used

d. Solvent-Base. Not used

e. Preformed Thermoplastic. Not used

620-2.3 REFLECTIVE MEDIA. Glass beads shall meet the requirements for Federal Specification TT-B-1325D, Type I, gradation A and Type III. Glass beads shall be treated with all compatible coupling agents recommended by the manufacturers of the paint and reflective media to ensure adhesion and embedment.

CONSTRUCTION

METHODS

620-3.1 WEATHER LIMITATIONS. The painting shall be performed only when the surface is dry and when the surface temperature is at least 45 °F (7 °C) and rising and the pavement surface temperature is at least 5 °F (2.7 °C) above the dew point. Painting operations shall be discontinued when the surface and dewpoint temperatures exceed the paint manufacturer’s recommendations. Markings shall not be applied when the pavement temperature is greater than 120 °F (49 °C).

620-3.2 EQUIPMENT. Equipment shall include the apparatus necessary to properly clean the existing surface, a mechanical marking machine, a bead dispensing machine, and such auxiliary hand-painting equipment as may be necessary to satisfactorily complete the job.

The mechanical marker shall be an atomizing spray-type or airless-type marking machine suitable for application of traffic paint. It shall produce an even and uniform film thickness at the required coverage and shall apply markings of uniform cross-sections and clear-cut edges without running or spattering and without over spray.

620-3.3 PREPARATION OF SURFACE. Immediately before application of the paint, the surface shall be dry and free from dirt, grease, oil, laitance, or other foreign material that would reduce the bond between the paint and the pavement. The area to be painted shall be cleaned by sweeping and blowing or by other methods as required to remove all dirt, laitance, and loose materials without damage to the pavement surface. Use of any chemicals or impact abrasives during surface preparation shall be approved in advance by the Engineer.

620-3.4 LAYOUT OF MARKINGS. The proposed markings shall be laid out by the Contractor in advance of the paint application. The locations of markings to receive glass beads shall be shown on the plans.

620-3.5 APPLICATION. Paint shall be applied at the locations and to the dimensions and spacing shown on the plans. Paint shall not be applied until the layout and condition of the surface has been approved by the Engineer. The edges of the markings shall not vary from a straight line more than 1/2 in (12 mm) in 50 ft. (15 m) and marking dimensions and spacings shall be within the following tolerances:

Dimension and Spacing Tolerance

36 in (910 mm) or less ±1/2 in (12 mm) greater than 36 in to 6 ft. (910 mm to 1.85 m) ± 1 in (25 mm) greater than 6 ft. to 60 ft. (1.85 m to 18.3 m) ± 2 in (51 mm) greater than 60 ft. (18.3 m) ± 3 in (76 mm)

The paint shall be mixed in accordance with the manufacturer’s instructions and applied to the pavement with a marking machine at the rate shown in Table 1. The addition of thinner will not be permitted.

Table 1 Application Rates For Paint And Glass Beads

Paint Type

Paint

Sq. ft. per gallon, ft2/gal.

Glass Beads, Type I, Gradation A

Pounds per gallon of paint-lb./gal.

Glass Beads, Type III

Pounds per gallon of paint-lb./gal.

Glass Beads, Type IV

Pounds per gallon of paint-lb./gal.

Waterborne 115 ft2/gal. max 7 lb./gal. min 10 lb./gal. min N/A

Glass beads shall be distributed upon the marked areas at the locations shown on the plans to receive glass beads immediately after application of the paint. A dispenser shall be furnished that is properly designed for attachment to the marking machine and suitable for dispensing glass beads. Glass beads shall be applied at the rate shown in Table 1. Glass beads shall not be applied to black paint. Glass beads shall adhere to the cured paint or all marking operations shall cease until corrections are made.

Retroreflectivity readings will be collected by the Iowa DOT after conclusion of the painting.

Type I glass bead readings should be a minimum of 300-450 millacandelas per square meter per lux for white and 175-250 for yellow. Type III glass bead readings should be 600- 1300 for white.

All emptied containers shall be stored for examination by the DOT. The containers shall not be destroyed until authorized by the DOT.

620-3.6 APPLICATION--PREFORMED AIRPORT PAVEMENT MARKINGS. Not used.

620-3.7 PROTECTION AND CLEANUP. After application of the markings, all markings shall be protected from damage until dry. All surfaces shall be protected from excess moisture and/or rain and from disfiguration by spatter, splashes, spillage, or drippings. The Contractor shall remove from the work area all debris, waste, loose or un-adhered reflective media, and by-products generated by the surface preparation and application operations to the satisfaction of the Engineer. The Contractor shall dispose of these wastes in strict compliance with all applicable state, local, and Federal environmental statutes and regulations.

METHOD OF

MEASUREMENT

620-4.1 The quantity of runway and taxiway markings to be paid for shall be the number of square feet of painting performed in accordance with the plans and specifications and accepted by the Engineer.

BASIS OF

PAYMENT

620-5.1 Payment shall be made at the respective contract price per square foot for runway and taxiway painting. This price shall be full compensation for furnishing all materials and for all labor, equipment, tools, and incidentals necessary to complete the item.

Item P-620-5.1 Runway and taxiway painting – per square foot

MATERIAL

REQUIREMENTS

FED SPEC TT-P-1952E Paint, Traffic and Airfield Marking, Waterborne

FED SPEC TT-B-1325D Beads (Glass Spheres) Retroreflective (Type I, gradation A and Type III)

End OF ITEM P-620