Rust free bridges 630.369.8915

The following is a one-page suggested RFP outline for bridge structures and other fabricated steel assemblies.

 

REQUEST FOR PRICING SPECIFICATIONS

111.01 Scope

These are guidelines only and will help the engineer provide written specifications for galvanized coating applied to bridge structures and other fabricated steel assemblies.

Note: These guidelines do not apply to the galvanized coating on semi-finished products such as wire, tube or sheet galvanized in specialized or automatic plants.

111.02 Quality Assurance

A. Relevant Standards: All reference to quality and testing standards will utilize the
American Society for Testing and Materials (ASTM):

BRIDGES AND OTHER STRUCTURAL STEEL

A 123 Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products

A 325 High Strength Bolts for Structural Steel Joints.

A 384 Safeguarding against Warpage and Distortion during Hot-Dip Galvanizing of Steel Assemblies.

A 385 Providing Quality Zinc Coatings (Hot-Dip).

A 563 Carbon and Alloy Steel Nuts.

A 780 Repair of Damaged Hot-Dip Galvanized Coatings

B 6 Zinc (Slab Zinc) Zinc bath for galvanizing shall not contain less than 98 % zinc.

111.03 Galvanizing process

Steelwork shall be prepared utilizing a caustic bath, acid pickle and flux. Where appropriate, the steel can be blast cleaned and fluxed. When the galvanizer detects design features, which may lead to difficulties during galvanizing, he shall point them out to the fabricator and arrange for modifications to be made prior to dipping. Surface Finish: The galvanized coating shall be continuous, adherent, as smooth and evenly distributed as possible and free from any defect that is detrimental to the stated end use of the coated article. The integrity of the coating shall be determined by visual inspection, coating thickness measurements, and adhesion testing.

111.04 Touch Up and Repair

Mechanical Damage: Areas damaged by welding, flame cutting, or during handling, transport or erection shall be repaired by one of the following methods whenever the damage exceeds 3/16" in width on flat surfaces or 1/10" on cut ends will be repaired by one of the following methods.

(a) Cold Galvanizing Compound, and the surfaces to be reconditioned with zinc-rich paint shall be clean, dry, and free of oil, grease and corrosion products. Areas to be repaired shall be power disc sanded to bright metal. To ensure that a smooth reconditioned coating can be effected, surface preparation shall extend into the undamaged galvanized coating. Touch-up paint shall be an organic cold galvanizing compound having a minimum of 65% zinc dust in the dry film. The paint shall be spray or brush applied in multiple coats until a dry film thickness of 4 mils minimum has been achieved. A finish coat of aluminum paint shall be applied to provide a color blend with the surrounding galvanizing.

(b) Zinc Based Solder, Surfaces to be reconditioned with zinc based solder shall be clean, dry, and free of oil, grease and corrosion products. Areas to be repaired shall be wire brushed and given a thin layer of acidic paste flux. Heat shall be applied slowly and broadly close to, but not directly onto the area to be repaired. The zinc-based solder rod shall be rubbed onto the heated metal until the rod begins to melt. A flexible blade or wire brush shall be used to spread the melt over the are to be covered. The zinc based solder shall be applied to a minimum thickness equivalent to that of the undamaged coating.

(c) Metallizing Surfaces to be reconditioned with zinc metal spray shall be clean, dry and free of oil, grease and corrosion products. The area to be repaired shall be grit blasted to white metal followed by zinc metal spraying to a coating thickness equivalent to that of the undamaged coating, and seal coated using an aluminum vinyl paint.

111.05. Inspections and tests


Inspections, tests and samples shall conform with ASTM Specifications and Standards. Inspection shall be carried out at the galvanizers plant by a designated party. Inspection rights and privileges, procedures, and acceptance or rejection of galvanized steel material shall conform with ASTM A 123 or A 153 as applicable. Inspections and tests shall include the following:

  1. Visual examination of samples or finished products, as appropriate.
  2. Tests to determine thickness or weight of zinc coating per square foot of metal surface.

MORE INFORMATION AND SPECIFICATIONS ABOUT HOT-DIPPED GALVANIZING:

  1. This website at www.rustfreetrucks.com/bridges.
  2. Email: Law9@comcast.net
  3. By fax to (630) 369-0947 request additional information.
  4. Speak with someone immediately call (630) 369-8915.
  5. From a business associate who owns one.
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Midwest Galvanizing Group Inc.
Box 63, Suite 103B
Naperville, IL 60566
Office (630)369-8915
Fax (630)369-0947
Email: Law9@comcast.net

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