523.051 Protective Coating Steel parts of bearings shall have protective coating applied
to the areas described within this section in accordance withS ection 506, Shop Applied Protective Coating- Steel. Masonry plates shall, at the Contractor’s option, be galvanized or metalized. The masonry plates shall be top coate d to match the coating of the superstructure beams when beams are coated. Portions of bearings between the masonry plate and sole plate t hat will be exposed after installation shall, at the Contractor’s option, be galvanized o r metalized. Steel between the masonry and sole plates shall be top coated to match the color of the superstructure beams when the adjacent superstructure beams are coated. Stainless st eel and /or machined surfaces with a roughness height of 125 micro-inches or smoother shall n ot be coated. Machined surface finishes with a roughness height of 125 micro-inches or smoother, except stainless steel, shall be lubricated wit h a non-corrosive, waterproof, hi gh pressure lubricant having a temperature range of -30 oF to 150 oF, National Lubrication and Grease Institute number not lower than 2 and an OK load of not less than 20 lbs., as measured by the requirements of ASTM D2509. Metal surfaces designed for sliding in contact with Teflon (PTFE) coated surfaces shall not be lubricated. Sole plates shall have the same finish as the adjacent structural steel. When adjacent structural steel is coated, the sole plate shall be galvanized/ or metalized, at the option of the contractor. Sole plates shall be top coated to match the color of the superstructure beams. When the adjacent structural steel is bare and uncoated, the so le plate shall be bare and uncoated. When the adjacent beams are concrete, the sole plates shall be galvanized. Areas to be field welded shall not be c oated prior to welding; theys hall be touched up after welding. Anchor rods shall be galvanized. When anchor rods are designate d to secure bare unpainted steel, a dielectric coating (epoxy or bituminous type coatings are acceptable) shall be applied to the anchor rod and/or adjacent steel to prevent c ontact between galvanized surfaces and bare unpainted steel. When bearings, or portions o f bearings, are painted to match adjacent structural steel, the anchor rods shall also be painted.
523.06Fabrication Tolerances Fabrication tolerances for all b earings shall comply with
unless otherwise noted on the Plans or in this Section 523, Bea rings.
1 Material Friction Test The coefficient of friction (‘c of’) between the two
mating surfaces shall be measured. Tests shall be made either o n samples taken from the same batch of materials as those used in the prototype bearings or the tests may, at the manufacturer’s option, be conducted on finished bearings. Only new materials shall be used; material that has been previously tested shall not be used. The surfaces shall be thoroughly cleaned with a degreasing solv ent. No lubrication, other than that specified for t he prototype bearings, shall be used. The mating surfaces for