443 SECTION 846 PRESERVATIVES AND PRESSURE TREATMENT PROCESSES FOR TIMBER
846.01 Timber Preservatives
Provide material that meets AASHTO M 133. Section 852 444 SECTION 852 PAINTS, OILS, AND THINNERS
852.01 Paints and Enamels
A.Lamp Black Use lamp black pigment that meets ASTM D 209.
B.Chrome Yellow and Chrome Orange Use chrome yellow and chrome orange pigments that meet ASTM D 211.
C.Enamels. Use enamel that meets the general requirements of Federal Specifications A -A-2962A, Notice 2 Enamel, Alkyd, Exterior, Solvent Based, Low VOCm with the following exceptions:
1.Alkyd resin shall be a Type I or Type II alkyd meeting Federal Specification TT-R -266 Resin, Alkyd; Solutions.
2.Specular gloss, 60 degrees, shall be in the range of 40 to 70.
852.02 Three Coat Organic Zinc Rich Paint System
A.Materials.
1.General. Use a three- coat paint system consisting of an organic zinc -rich epoxy primer, a polyamide epoxy intermediate coat, and an aliphatic polyurethane finish coat. Submit the three-coat system to the NTPEP testing program and submit the results to the Department. Provide a system from a single manufacturer. Provide components that are recommended for use as part of a three-coat system.
2.Organic Zin c-Rich Epoxy Primer. Use an organic zinc -rich epoxy primer that is a multi -component, solvent based, chemically -curing, polyamide epoxy system. Use zinc dust pigment meeting the requirements of ASTM D 520, Type II. Use primer capable of being spray applied to the manufacturer's recommended Dry Film Thickness (DFT) in one coat without sagging or mud cracking. After mixing the primer shall be smooth and uniform, and free of lumps or coarse particles. Formulate the color of the primer to produce a distinct contrast with the blast cleaned steel and the subsequent intermediate coat. Add tinting materials that are inert and do not reduce the effectiveness of the galvanic protection.
3.Intermediate Coat. Use a two component chemically -curing polyamide epoxy for the intermediate coat. Mix the paint to be smooth, uniform, and capable of being spray applied. Formulate the color of the intermediate coat to produce a distinct contrast with the primer and the finish coat.
Referenced in this section
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Source: North Dakota Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 478–478 of 550. View official source ↗