- 904 - SECTION 1060 -- GALVAN IZED CABLE CLAMPS
1060.01 Description
1.Galvanized cable clamps shall be drop-forged steel or malleable iron and shall have a uniform zinc coating conforming to the requirements of AASHTO M 30, with the exception that the weight of coating shall be determined by the use of magnetic thickness test method ASTM E 376.
1060.02 Acceptance Requirements
1.Acceptance will be based on r equirements identified in the Department’s Materials Sampling Guide . - 905 - SECTION 1061 -- REPAIR OF DAMAGED METALLIC COATINGS
1061.01 Description
1.This Section describes methods that are used to repair damaged zinc coatings, aluminum coatings, an d aluminum-zinc alloy coatings on surfaces that have been damaged in f abrication, transporting, handling, installation, or welding. Damaged surfaces shall be repaired by the Contractor without additional cost to the Department.
2.The material used for repair shall provide a minimum coating thickness of at least 2 mils (50 m) with one application.
3.The coating material may be applied under shop or field conditions.
1061.02 Material Characteristics
1.Repair Method 1 -- Zinc-Based Solder Alloys:
a.The Contractor shall use zinc alloy solders for this repair method. The most common types of so lder are zinc-cadmium and zinc-tin- lead alloys having liquidus temperatur es in the ranges from 518°F to 527°F (270C to 275 C) and 446°F to 500°F (230 C to 260 C), respectively. (The liquidus temperature is that temperatur e above which an alloy is completely molten.) The solders can be used in rod form or as powders.
b.Surface Preparation:
1.The Contractor shall cl ean the surface to be reconditioned using a wire brush, a light grinding action, or mild blasting so a smooth reconditioned coating will adhere. Surfac e preparation shall extend into the surrounding, undamaged coating.
2.If the area to be reconditioned includes welds, the Contractor shall remove all flux residue and weld spatter by blast cleaning or mechanical means (chipping).
3.The Contractor shall preh eat the area to be reconditioned to at least 600°F (315 C) and shall not overheat [beyond 750°F (400 C)], or allow the surrounding coating to be burne d. The Contractor shall wire brush the surface that is to be re conditioned during preheating.
4.The Contractor shall ru b the cleaned, preheated area with the repair stick to deposit an evenly distributed layer of the zinc alloy. When powdered zinc alloys are used, t he powder shall be sprinkled on the cleaned, preheated surface and spread out with a spatula or similar tool. The minimum thickness of the coating shall be as specified.
5.When the repair has been made, the Contractor shall remove the flux residue by rinsing with water or wiping with a damp cloth.
6.The thickness measurements shall be made with either a magnetic or electromagnetic gauge to ensure the proper thickness was applied.
2.Repair Method 2 -- Zinc-Rich Paint: a. Zinc-rich paints are usually based on organic binders that are pre-mixed and formulated specifically for use on steel surfaces. Zinc-rich paint is suitable for repairing damage d coatings, provided the dried film contains a minimum of 65% zinc dust by weight.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 938–938 of 1,048.