1802 - ORGANIC ZINC PRIMER FOR STRUCTURAL STEEL 1800-3
1802.1 Description
This specification covers organic zinc primer for use on structural steel.
1802.2 Requirements
a. General.
1.The coating is either a single component or mu lti-component type that cures without the use of a separate curing solution. It must be well ground, free of caking, skins, gelation and excessive settling with a shelf life for each component of no less than 12 months. Formulate the paint with a tint that provides distinct color contrast with the blast cleaned metal surfaces and the finish coat. The VOC content of the coating must comply with the EPA Federal Register 40 CFR, Part 59, Subpart D, Table 1for industrial maintenance coatings.
2.The manufacturer is responsible for the formulation. Once established, the formulation may not be changed without prior notification to and approval of the KDOT. b. Pigment. Use a finely divided zinc powder as the pigment. Pigments must contain no toxic heavy metals. c. Mixed Paint.
1.Zinc in the dried film , % by weight ................................................................. 77 minimum
2.Cyclic Corrosion/UV Exposure Test , 15 cycles (one cycle = 2 weeks; one week of UV exposure and one week in the Cyclic Corrosion Tester.)
a.Scribe Corrosion ................................................................................ 7minimum
b.Unscribed Area .................................................................................. 9minimum d. Packaging. Package the organic zinc primer such th at when mixed according to the manufacturer's instructions, a complete container of each component is utilized.
1802.3 Test Methods
a. Zinc in the Dried Film.
1.Single Component Primer Pigment ................................................................................................................. AST M D 2371 Total Solids of the Whol e Paint, Non-Volatile Zinc Oxide ................................... ASTM D 2369 Calculations: ZnO x 0.8034 = Total Zinc (% Pigment x Total Zinc)/Total Solids = Zinc in Dried Film
2.Multi-Component Primer Total Solids of Liquid Portion, Non-Volatile Zinc Oxide ..................................... ASTM D 2369 The manufacturer will provide percent pigment by the mix ratio. Calculations: ZnO x 0.8034 = Total Zinc (100 - % Pigment)(Non-volatile) + % Pigment = Total Solids (% Pigment x Total Zinc)/Total Solids = Zinc in Dried Film b. Cyclic Corrosion/UV Exposure. ..................................................................... ASTM D 5894 and KTMR-30
1.Scribe Corros ion .............................................................................................. ASTM D 1654
2.Unscribed Area ................................................................................................ ASTM D 16 54 1802 - ORGANIC ZINC PRIMER FOR STRUCTURAL STEEL 1800-4
1802.4 Prequalification
a. Prequalification of the organic zinc primer is required. Manufacturers desiring prequalification should submit a 1 pint sample of each component to the Engineer of Tests. Manufacturers will be notified when testing is completed. A list of prequalified materials will be maintained by the Bureau of Construction and Materials. b. Testing and evaluation by KDOT may be waived if complete testing has been performed on the identical product by AASHTO National Transportation Product Evaluation Program (NTPEP) or another state DOT. Forward an official copy of the test report along with evidence that the product referenced is identical to that submitted for prequalification, to the Engineer of Tests for evaluation. c. All liquid components will be “fi ngerprinted” using infrared spectrosc opy for use in screening future verification samples to ensure that materials submitted for use are of an identical formulation as originally approved.
1802.5 Basis of Acceptance
Prequalification as specified in subsection 1802.4. Receipt and approval of a Type C certification as specified in DIVISION 2600. Visual observation of performance on the project.
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Source: Standard Specifications for State Road and Bridge Construction, 2015 Edition. Pages 844–845 of 978. View official source ↗