1071SPOT PAINTING EXISTING STRUCTURAL STEEL

1071.1DESCRIPTION—This work is spot painting existing structural steel as indicated and directed.

1071.2MATERIAL—Section 1070.2 except as follows:

Section 1070.2(a) Coating System, replace with the following:

manufacturer listed in Bulletin 15 . For faying surfaces, provide an organic , zinc-rich primer listed in Bulletin 15 and the Northeast Protective Coatings Committee (NEPCOAT) Qualified Products List B. Verify the organic, zinc-rich primer has a Class B certification, certified within the last 7 years, from an AASHTO approved laboratory according to the Research Council on Structural Steel Connections

Section 1070.2(b)1. Finish Coat Color Chips, replace with the following:

in its current condition to a color number from the AMS-STD-595A color chart. Provide samples that are a minimum of 6 inch by 6 inch in size. If the color number indicates a finish other than semi-gloss, provide a semi-gloss finish coat. Do not obtain finish coat material until acceptance of the color and gloss level.

1071.3CONSTRUCTION—Section 1070.3 except as follows:

Section 1070.3(c)5. Test Areas (Hold Point), replace with the following:

Section 1070.3(c)6. Blast Cleanliness (Hold Point), replace with the following:

Blast Cleaning. Alternately, steel may be cleaned according to SSPC -SP11 Power Tool Cleaning to Bare Metal if surface profile requirements outlined in the product data sheet are followed. Utilize clean, oil-free, dry compressed air for abrasive blast cleaning. Conduct blotter test(s) according to ASTM D4285 a minimum of one time each shift for each compressor system in use to verify the air supply is free of moisture and oil contamination. Conduct the tests in the presence of the Representative. If contamination is evident, re-inspect all surfaces prepared since the last acceptable test. Roughen the existing co ating around the area to be coated to ensure good adhesion. Feather the surrounding coating to expose a minimum of 1/2 inch of each existing coat and provide a smooth transition into intact, adherent material for all coats.

Section 1070.3(c)7. Abrasives and Surface Profile (Hold Point), replace with the following:

garnet or coal slag meeting the requirements according to SSPC-AB 1 may be used that produce a surface profile according to the product data sheet(s) for the coating being applied. Submit expendable, one- time use abrasives to the Structure Control Engineer for acceptance. Do not use silica sand. Recyclable abrasives may be used that are clean, dry , and properly sized to produce a surface profile according to the product data sheets(s) for the coating being applied. Use recyclable abrasives that create the least amount of waste possible. Submit a technical data sheet from the recyclable abrasive manufacturer indicating the number of recycles possible with the material. Do not recycle abrasives beyond the manufacturer’s recommended limits. Acceptable recyclable abrasives are aluminum oxide, silicon carbide, zirconium aluminum oxide, and steel grit.

Use a reclamation system that removes fines, returns properly sized abrasive for reuse, and is equipped with dust collectors to ensure the discharge meets air quality requirements. Test the cleanliness of the recycled abrasive according to SSPC -AB 2. If the abrasive fails the tests, promptly replace the abrasive and make changes to the equipment as necessary to achieve compliance. Reclean contaminated areas. Measure the surface profile depth according to SSPC-PA 17 using ASTM D4417 Method B, depth micrometer or Method C, replica tape. If the profile is outside of the specified range, obtain different abrasives and completely re-blast the steel to achieve the specified profile. Grind laminations and slivers in the steel that become visible after blast cleaning operations flush with the surface and re-blast the ground area to obtain the specified anchor pattern and cleanliness.

1071.4MEASUREMENT AND PAYMENT—Lump Sum

Penetrating Sealer and caulking are incidental.