710.01 Pigments, Vehicles, and Thinners
Ensure all materials from which paints are made and formulated are in accordance with the following specifications: Aluminum Pigments ................................................ ASTM D962 Black Synthetic Iron Oxide Pigment ........................ ASTM D769 Bone Black Pigment ................................................ ASTM D210 Calcium Carbonate Pigments .................................. ASTM D1199 Carbon Black Pigment............................................. ASTM D561 Chrome Oxide Green Pigment ................................ ASTM D263 Chrome Yellow and Chrome Orange Pigments ....... ASTM D211 Lampblack Pigments ............................................... ASTM D209 Liquid Paint Driers ................................................... ASTM D600 Magnesium Silicate Pigments ................................. ASTM D605 Mica Pigment .......................................................... ASTM D607 Ochre (Ferrous Earthy Pigments) ............................ ASTM D85 Petroleum Spirits (Mineral Spirits) ........................... ASTM D235 Raw and Burnt Sienna Pigments ............................. ASTM D765 Raw and Burnt Umber Pigments ............................. ASTM D763 Red and Brown Iron Oxide Pigments ...................... ASTM D3722 Titanium Dioxide Pigments ...................................... ASTM D476 Yellow Iron Oxide Pigment-hydrated ....................... ASTM D768 Zinc Dust (Pigment) ................................................ ASTM D520 Zinc Oxide Pigments ............................................... ASTM D79
710.02 Paints and Enamels
A.General. Follow the paint manufacturer’s recommendations including but not limited to storage, application, thinning, safety precautions, and film thickness unless otherwise specified. Furnish all paints under this section free of lead, or zinc chromate unless specified. Provide the manufacturer’s MSDS. Supply the paint in the original container labeled with the manufacturer’s name, address, paint type, formula identification, date of manufacture, and lot or batch number. Paints for structural steel where multiple coats are applied must be produced by the same manufacturer. Provide the Project Manager certified test results from an independent testing facility showing the following paints supplied meet the applicable requirements.
B.Paints for Miscellaneous Metals. Use the following paints on metal unless otherwise specified.
1.Reserved.
2.Aluminum Epoxy Paint. Furnish aluminum epoxy paint that is a self-priming, two- component, high build, aluminum filled epoxy mastic. The paint must adhere to metal surfaces and existing painted surfaces when the surface is prepared following the paint manufacturer’s recommendations. 710 – PAINTS 2020 EDITION V5.1 710-2 Apply the coating following all the manufacturer’s recommendations to produce a minimum 5 mil (0.125 mm) dry film thickness. Meet Table 710-1 minimum paint composition requirements. TABLE 710-1 ALUMINUM EPOXY PAINT COMPOSITION Composition Solids 90% ± 2% by volume (ASTM D2697) Pigment 19% by volume Vehicle 66% by volume Percent non-volatile vehicle 74% Nominal VOC 0.74 pounds per gallon (89.1 g/L) The mixed paint must weigh between 11 to 12 pounds per gallon (1.3 to 1.4 kg/L) when measured in accordance with ASTM D1475 at 75 ± 2 °F (24 ± 1 °C). The mix ratio of the two components must be 1:1 by volume and have a minimum pot life of 4 hours at 75 °F (24 °C) when thinned following the manufacturer’s recommendations.
3.Epoxy Paint for Pipe Pile. Furnish epoxy paint that is a two-component, self-priming epoxy coating in accordance with Table 710-2. TABLE 710-2 EPOXY PAINT FOR PIPE PILE REQUIREMENTS Requirement Drying Time at 75 °F (24 °C) To Touch To Cure 2 hours max. 10 days max. Pot Life at 70 °F (21 °C) 12 hours min. Abrasion resistance (ASTM D4060; CS-17 wheel, 1,000 Gram load, 1,000 cycles) 170 mg loss, max. Additional requirements:
a.Salt Fog. No blistering, cracking, or film delamination when tested in accordance with ASTM B117 for 1,500 hours; and
b.Moisture Condensation Resistance. No blistering, cracking, or film delamination when tested in accordance with ASTM D2247 for 1,000 hours at 100 °F (37 °C).
4.Equipment Enamel. Furnish equipment enamel that is formulated using Federal Specification TT-E-489b, Class A, spray, or brush consistency in accordance with the contract. Match the appropriate color chip, available from the Materials Bureau. Meet the thinner requirements of Federal Specification TT-T306. Use at a maximum rate of 1 pint per gallon (0.12 L/L) when required.
5.White, Yellow, and Black Enamel. Furnish water resistant enamels made from synthetic gums capable of brush application to vertical metal surfaces without running, streaking, or sagging. 2020 EDITION V5.1 PAINTS – 710 710-3 Meet Table 710-3 requirements. TABLE 710-3 ENAMEL PAINT REQUIREMENTS White Yellow Black Coarse particles and skins retained on No. 325 sieve (0.045 mm), max. 0.50% 0.50% 0.50% Nonvolatile matter, min. 85% 85% 85% Dry to touch at 70 °F (21 °C) time in hours, max. 5 5 5 Dry hard at 70 °F (21 °C) time in hours, max. 24 24 24 Toughness, Kauri reduction test at 75 °F (24 °C), min. 150% 150% 150% Hiding power, square feet per gallon (m2/L) by Pfund cryptometer model E, 300 450 Black plates, min. (7.3) (11) Meet federal test method standard No. 141C for whitening, dulling, or change in color, brushing, flowing, covering, and leveling properties. The white enamel must be equal in brightness to rutile (Type IV) titanium dioxide pigment. Yellow enamel must match standard color sample for D-2 yellow guardrail paint. Black enamel must be jet black and cover completely in one coat.
6.Zinc Phosphate Paint. Zinc phosphate paint may be used as a primer or finish coat unless otherwise specified. Provide the finish paint color specified in the contract and match the appropriate color chip, available upon request. The paint must:
a.Be well ground.
b.Show no skinning in a freshly opened, full can.
c.Not cake or settle in the container.
d.Readily break up with a paddle to a smooth, uniform consistency.
e.Brush easily, possess good leveling qualities; and
f.Dry to a hard uniform finish. 710 – PAINTS 2020 EDITION V5.1 710-4 Meet Table 710-4 requirements. TABLE 710-4 ZINC PHOSPHATE PAINT REQUIREMENTS Requirement Min. Max. Pigment4 56.5% 58.5% Vehicle5 41.5% 43.5% Pigment Composition: Zinc phosphate 60.0% — Titanium dioxide (Rutile)6 13.0% — Calcium carbonate 21.4% — Vehicle Composition: Alkyd phthalic resin (50% Solids) 52.4% — Raw linseed oil 26.2% — Mineral spirits 17.2% — Driers and additives 4.2% — Finished Paint: Consistency (Krebs-Stormer)1 70 KU 83 KU Weight 2, pounds per gallon (g/mL) 12.6 (1.51) — Dry to touch3 8 hours Dry to handle3 16 hours Dry film thickness, mil (mm) 1.0 (0.025) — Notes:
1.By ASTM D562
2.By ASTM D1475
3.Federal Test Method Standards 141C Method 4061.2
4.Federal Test Method No. 141-Method 4021
5.Federal Test Method No. 141-Method 4051
6.ASTM D1394
710.02.1 Paint Coating Systems for New Structures
A.Inorganic Zinc Rich Primer. Meet AASHTO M 300 Type I or II requirements, excluding those in Section 4.7.
B.Intermediate Coat. Use a two-component polyamide epoxy in accordance with Table 710-5. 2020 EDITION V5.1 PAINTS – 710 710-5 TABLE 710-5 STRUCTURES - INTERMEDIATE COAT REQUIREMENTS Requirement Drying time @ 50 °F (10 °C) to touch tack free cure 4 hours max. 24 hours max. 14 days max. Pot Life @ 50 °F (10 °C) 10 hours min. Abrasion resistance (ASTM D4060, CS-17 wheel, 1,000 cycles) 224 mg max. loss direct impact resistance 120 inch-pounds (13.6 N-m) minimum Additional requirements:
1.Salt Fog. No blistering, softening, cracking, or film delamination when tested in accordance with ASTM B117 for 1,000 hours; and
2.Moisture Condensation Resistance. No blistering, rusting or delamination when tested in accordance with ASTM D2247 for 1,000 hrs. at 100 °F (37 °C).
C.Finish Coat. Provide urethane paint in accordance with Table 710-6. TABLE 710-6 STRUCTURES - FINISH COAT REQUIREMENTS Requirement Drying time @ 50 °F (10 °C) to touch 10 hours max. tack free 24 hours max. cure 14 days max. Pot life @ 50 °F (10 °C) 10 hours min. Abrasion resistance (ASTM D4060, CS-17 wheel, 1,000 cycles) 224 mg. max. loss Impact resistance 120 inch-pounds (13.6 N-m) minimum Additional requirements:
1.Salt Fog. No blistering, softening, cracking, or film delamination when tested in accordance with ASTM B117 for 1,000 hours; and
2.Moisture Condensation Resistance. No blistering, rusting or delamination when tested in accordance with ASTM D2247 for 1,000 hours at 100 °F (37 °C).
710.03 Powder Coating Prequalification and Certification
Provide certified test results of the tests shown in Table 710-7 for powder coated material. Submit certified test results and samples for approval. Only coatings approved are permitted to be used. 710 – PAINTS 2020 EDITION V5.1 710-6 TABLE 710-7 CERTIFIED TEST RESULTS Test Name ASTM Designation Specification Limits Salt spray test D1654 (B117) rating number minimum 6 (from Table 1) after 1000 hours Impact test D2794 80 inch-pounds (9.0 N-m) minimum Cross hatch adhesion test D3359 5A or 5B minimum Hardness test D3363 2H Bend test D522 180° bend ½-inch (12.5 mm) diameter mandrel with no breaks flaking or cracks UV exposure G154 1,000 hours no film failure Thickness D7091 3 mil (0.075 mm) minimum Abrasion taber abraser D4060 1,000 gram 1,000 cycles 100 mg maximum weight loss Submit two 4 x 4-inch (100 x 100 mm) by 24 gauge (0.51 mm) coupons along with the test results of the coating material used. The coating must be representative of expected quality and color of coatings from a production line.
710.04 Anti-Graffiti Coating-Permanent
Furnish a permanent, non-sacrificial siloxane-based anti-graffiti coating capable of withstanding multiple cleanings which is listed on the QPL. Coating must allow graffiti to be removed through the use of a water pressure washer and without detergents or chemicals. Product must be approved by the manufacturer for use on the intended material or surface and have a finished dry film thickness of not less than 6 mils (0.150 mm). Remove any graffiti prior to application of an anti-graffiti coating. Prepare the substrate surface, apply, cure, and maintain coating in accordance with the manufacturer’s recommendations.
710.05 Paint Coating Systems for Existing Structures
Meet the requirements of NEPCOAT - Qualified Products List, for Protective Coatings for New and 100% Bare Existing Steel for Bridges, NEPCOAT System B - Organic zinc rich primer / Epoxy or Urethane intermediate / Aliphatic urethane finish.
710.06 Overcoating Systems for Exisiting Structures
Include a full penetrating sealer primer coat along with full coats of B. Intermediate coat and Finish coat from 710.02.1 Paint Coating Systems for New Structures. Submit coating manufacturer product data sheets for each coating within this system along with a letter stating that their system will be compatible with the existing system on the structure.
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Source: Standard Specifications for Road and Bridge Construction, 2020 (v5.1) Edition. Pages 569–574 of 611. View official source ↗