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L.

Finish: For exterior steel items and items indicated for galvanizing, apply zinc coating by [hot-dip process according to ASTM A 123/A 123M, after fabrication, or ASTM A 153/A 153M, as applicable] [electrodeposition according to ASTM B 633, SC 3, Type 1and 2].

1.

Galvanizing Repair Paint:  High-zinc-dust-content paint with dry film containing not less than 94 percent zinc dust by weight, and complying with DOD-P-21035A or SSPC-Paint 20.

Retain paragraph below if paint finish is required.  Revise locations of priming, if required.  MPI 79 (FS TT-P-664) in first option below provides some corrosion protection while SSPC-Paint 25, without top coating, provides minimal corrosion protection.

M.

Shop-Primed Finish:  Prepare surfaces of non-galvanized steel items, except those surfaces to be embedded in concrete, according to requirements in SSPC-SP 1 followed by SSPC-SP 3 and shop-apply [lead- and chromate-free, rust –inhibitive primer, complying with performance requirements in MPI 79] [SSPC-Paint 25] according to SSPC-PA 1.

N.

Welding Electrodes:  Comply with AWS standards.

2.7  STAINLESS-STEEL CONNECTION MATERIALS

Delete this Article if not required.  Use when resistance to staining merits extra cost in parking structures and other high moisture or corrosive areas.

A.

Stainless-Steel Plate:  ASTM A 666, Type 304, of grade suitable for application.

B.

Stainless-Steel Bolts and Studs:  ASTM F 593, alloy 304 or 316, hex-head bolts and studs; stainless-steel nuts; and flat, stainless steel washers.  Lubricate threaded parts of stainless steel bolts with an anti-seize thread lubricant during assembly.

C.

Stainless-Steel Headed Studs:  ASTM A 276 and bearing the minimum mechanical properties for studs as indicated under MNL 117, Table 3.2.3.

2.8

 BEARING PADS AND OTHER ACCESSORIES

Delete this Article if not applicable.  Choice of bearing pad can usually be left to fabricator; coordinate selection with structural engineer if required.

A.

Provide bearing pads for architectural precast concrete units as follows:

1.

Elastomeric Pads:  AASHTO M 251, plain, vulcanized, 100 percent polychloroprene (neoprene) elastomer, molded to size or cut from a molded sheet, 50 to 70 Shore A durometer according to ASTM D2240, minimum tensile strength 2250 psi (15.5 MPa) per ASTM D 412.

2.

Random-Oriented, Fiber-Reinforced Elastomeric Pads:  Preformed, randomly oriented synthetic fibers set in elastomer.  Surface hardness of 70 to 90 Shore A durometer according to ASTM D2240.  Capable of supporting a compressive stress of 3000 psi (20.7 MPa) with no cracking, splitting or delaminating in the internal portions of the pad.  Test one specimen for each 200 pads used in the project.

3.

Cotton-Duck-Fabric-Reinforced Elastomeric Pads:  Preformed, horizontally layered cotton-duck fabric bonded to an elastomer.  Surface hardness of 80 to 100 Shore A durometer according to ASTM D2240. Conforming to Division II, Section 18.10.2 of AASHTO LRFD

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