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Corrosion protection for pre-stressing tendons, pre-stressing anchorages, couplers and end block shall comply with the requirements of ACI 530.1/ASCE 6/TMS 602, Article 2.4G. Corrosion protection for carbon steel accessories used in exterior wall construction or interior walls exposed to a mean relative humidity exceeding 75 percent shall comply with either Section 2103.11.7.1 or 2103.11.7.2. Corrosion protection for carbon steel accessories used in interior walls exposed to a mean relative humidity equal to or less than 75 percent shall comply with either Section 2103.11.7.1, 2103.11.7.2 or 2103.11.7.3.
2103.11.7.1 Hot-Dipped Galvanized
Apply a hot-dipped galvanized coating after fabrication as follows:
  1. For joint reinforcement, wall ties, anchors and inserts, apply a minimum coating of 1.5 ounces per square foot (psf) (458 g/m2) complying with the requirements of ASTM A 153, Class B.
  2. For sheet metal ties and sheet metal anchors, comply with the requirements of ASTM A 153, Class B.
  3. For steel plates and bars, comply with the requirements of either ASTM A 123 or ASTM A 153, Class B.
2103.11.7.2 Epoxy Coatings
Carbon steel accessories shall be epoxy-coated as follows:
  1. For joint reinforcement, comply with the requirements of ASTM A 884 Class B, Type 2—18 mils (457 m).
  2. For wire ties and anchors, comply with the requirements of ASTM A 899 Class C—20mils (508 m).
  3. For sheet metal ties and anchors, provide a minimum thickness of 20 mils (508 m) or in accordance with the manufacturer's specification.
2103.11.7.3 Mill Galvanized
Apply a mill galvanized coating as follows:
  1. For joint reinforcement, wall ties, anchors and inserts, apply a minimum coating of 0.1 ounce psf (31g/m2) complying with the requirements of ASTM A 641.
  2. For sheet metal ties and sheet metal anchors, apply a minimum coating complying with Coating Designation G-60 according to the requirements of ASTM A 653.
  3. For anchor bolts, steel plates or bars not exposed to the earth, weather or a mean relative humidity exceeding 75 percent, a coating is not required.

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