1、SSPC-PA Guide 13AASHTO/NSBA Steel Bridge CollaborationS 8.1 - 2006Guide for Application of Coating Systems With Zinc-Rich Primers to Steel BridgesAASHTO/NSBA Steel Bridge CollaborationSSPC: The Society for Protective CoatingsPreface This document is a standard developed by the AASHTO/NSBA Steel Brid
2、ge Collaboration and SSPC: The Society for Protective Coatings. The primary goal of the Collaboration is to achieve steel bridge design and construction of the highest quality and value through standardization of the design, fabrication, and erection processes. The mission of the SSPC is to advance
3、the technology and promote the use of protective coatings to preserve industrial, marine and commercial structures, components and substrates. Each standard represents the consensus of a diverse group of professionals. As consensus documents, the Collaboration standards represent the best available
4、current approach to the processes they cover. It is intended that Owners adopt and implement Collaboration standards in their entirety to facilitate the achievement of standardization. It is understood, however, that local statutes or preferences may prevent full adoption of the document. In such ca
5、ses Owners should adopt these documents with the exceptions they feel are necessary. This document establishes and defines the functions, operations, requirements, and activities needed to achieve consistent quality in steel bridge painting. It is based on a cooperative approach to achieving quality
6、, where both the Owners and Contractors representatives work together with a clear understanding of their roles and responsibilities, resulting in steel bridges completed in an efficient manner while meeting all contractual requirements. Its acceptance does not in any respect preclude anyone, whethe
7、r he has adopted the standard or not, from manufacturing, marketing, purchasing, or using products or procedures not addressed in this standard. Copyright 2006 by National Steel Bridge Alliance. All rights reserved. Disclaimer All data, specifications, suggested practices presented herein, are based
8、 on the best available information and delineated in accordance with recognized professional engineering principles and practices, and are published for general information only. Procedures and products, suggested or discussed, should not be used without first securing competent advice respecting th
9、eir suitability for any given application. Publication of the material herein is not to be construed as a warranty on the part of the American Association of State Highway and Transportation Officials (AASHTO), the National Steel Bridge Alliance (NSBA) or SSPC: The Society for Protective Coatings -
10、or that of any person named herein - that these data and suggested practices are suitable for any general or particular use, or of freedom from infringement on any patent or patents. Further, any use of these data or suggested practices can only be made with the understanding that neither AASHTO, NS
11、BA nor SSPC makes any warranty of any kind respecting such use and the user assumes all liability arising therefrom. AASHTO Document No: NSBAACS-1-OL AASHTO EXECUTIVE COMMITTEE 20062007 Voting Members Officers: President: Victor M. Mendez, Arizona Vice President: Pete K. Rahn, Missouri Secretary-Tre
12、asurer: Carlos Braceras, Utah Regional Representatives: REGION I: Allen Biehler, Pennsylvania, One-Year Term David Cole, Maine, Two-Year Term REGION II: Joe McInnes, Alabama, One-Year Term Stephanie Kopelousos, Florida, Two-Year Term REGION III: Carol Molnau, Minnesota, One-Year Term Debra L. Miller
13、, Kansas, Two-Year Term REGION IV: Victor M. Mendez, Arizona, One-Year Term vacant, Two-Year Term Nonvoting Members Immediate Past President: Harold E. Linnenkohl, Georgia AASHTO Executive Director: John Horsley, Washington, DC i AASHTO HIGHWAY SUBCOMMITTEE ON BRIDGES AND STRUCTURES 2006 Malcolm T.
14、Kerley, Virginia Chair James A. Moore, New Hampshire Vice Chair M. Myint Lwin, Federal Highway Administration, Secretary Firas I. Sheikh Ibrahim, Federal Highway Administration, Assistant Secretary ALABAMA, William F. Conway, John F. Black, George H. Connor ALASKA, Richard A. Pratt ARIZONA, Jean A.
15、Nehme ARKANSAS, Phil Brand CALIFORNIA, Kevin Thompson, Susan Hida, Barton Newton COLORADO, Mark A. Leonard, Michael G. Salamon CONNECTICUT, Gary J. Abramowicz, Julie F. Georges DELAWARE, Jiten K. Soneji, Barry A. Benton DISTRICT OF COLUMBIA, Donald Cooney FLORIDA, William N. Nickas, Marcus Ansley, A
16、ndre Pavlov GEORGIA, Paul V. Liles, Jr., Brian Summers HAWAII, Paul T. Santo IDAHO, Matthew M. Farrar ILLINOIS, Ralph E. Anderson, Thomas J. Domagalski INDIANA, Anne M. Rearick IOWA, Norman L. McDonald KANSAS, Kenneth F. Hurst, James J. Brennan, Loren R. Risch KENTUCKY, Allen Frank LOUISIANA, Hossei
17、n Ghara, Tony M. Ducote MAINE, James E. Tukey, Jeffrey S. Folsom MARYLAND, Earle S. Freedman, Robert J. Healy MASSACHUSETTS, Alexander K. Bardow MICHIGAN, Steve P. Beck, Raja T. Jildeh MINNESOTA, Daniel L. Dorgan, Kevin Western MISSISSIPPI, Mitchell K. Carr, B. Keith Carr MISSOURI, Shyam Gupta, Paul
18、 Kelly, Paul Porter MONTANA, Kent M. Barnes NEBRASKA, Lyman D. Freemon, Mark Ahlman, Hussam Fallaha NEVADA, William C. Crawford, Jr. NEW HAMPSHIRE, James A. Moore, Mark W. Richardson, David L. Scott NEW JERSEY, Harry A. Capers, Jr., Richard W. Dunne NEW MEXICO, Jimmy D. Camp NEW YORK, George A. Chri
19、stian, Donald F. Dwyer, Arthur P. Yannotti NORTH CAROLINA, Greg R. Perfetti NORTH DAKOTA, Terrence R. Udland OHIO, Timothy J. Keller, Jawdat Siddiqi OKLAHOMA, Robert J. Rusch, Gregory D. Allen OREGON, Bruce V. Johnson PENNSYLVANIA, Thomas P. Macioce, Harold C. Rogers, Jr. PUERTO RICO, Jaime Cabr RHO
20、DE ISLAND, David Fish SOUTH CAROLINA, Barry W. Bowers, Jeff Sizemore SOUTH DAKOTA, John C. Cole TENNESSEE, Edward P. Wasserman TEXAS, William R. Cox, David P. Hohmann, Ronald D. Medlock U.S. DOT, M. Myint Lwin, Firas I. Sheikh Ibrahim, Hala Elgaaly UTAH, Todd Jensen VERMONT, William Michael Hedges V
21、IRGINIA, George M. Clendenin, Prasad L. Nallapaneni, Julius F. J. Volgyi, Jr. WASHINGTON, Jugesh Kapur, Tony M. Allen, Bijan Khaleghi WEST VIRGINIA, Gregory Bailey, James W. Sothen WISCONSIN, Finn Hubbard WYOMING, Gregg C. Fredrick, Keith R. Fulton ALBERTA, Tom Loo NEW BRUNSWICK, Doug Noble NOVA SCO
22、TIA, Mark Pertus ONTARIO, Bala Tharmabala SASKATCHEWAN, Howard Yea GOLDEN GATE BRIDGE, Kary H. Witt N.J. TURNPIKE AUTHORITY, Richard J. Raczynski N.Y. STATE BRIDGE AUTHORITY, William J. Moreau PENN. TURNPIKE COMMISSION, Gary L. Graham SURFACE DEPLOYMENT AND DISTRIBUTION COMMAND TRANSPORTATION ENGINE
23、ERING AGENCY, Robert D. Franz U.S. ARMY CORPS OF ENGINEERS -DEPARTMENT OF THE ARMY, Paul C. T. Tan U.S. COAST GUARD, Nick E. Mpras, Jacob Patnaik U.S. DEPARTMENT OF AGRICULTURE -FOREST SERVICE, Rosana Barkawi ii Guide Specification for Application of Coating Systems with Zinc-Rich Primers to Steel B
24、ridges Table of Contents Introduction. 1 Section 1 Definitions 2 1.1 Applicator (“Shop”)2 1.2 Breaking the Corner (Corner Chamfering) .2 1.3 Checking .2 1.4 Conformance Certification2 1.5 Corner .3 1.6 Edge 3 1.7 Edge Grinding (Edge Conditioning).3 1.8 Fastener.3 1.9 Faying Surfaces 3 1.10 Limited A
25、ccess Areas .3 1.11 Mud Cracking .4 1.12 Qualified Product4 1.13 Sharp.4 1.14 Spot Priming .4 1.15 Stripe Coat 4 1.16 Visible Coating Defects 4 1.17 Weld Spatter, Tight.4 Section 2 Reference Standards . 5 2.1 American Association of State Highway and Transportation Officials (AASHTO)5 2.2 American S
26、ociety for Testing and Materials (ASTM)5 2.3 SSPC: The Society for Protective Coatings5 2.4 Research Council on Structural Connections (RCSC)6 2.5 American Institute for Steel Construction (AISC)6 2.6 Related Reference Documents6 Section 3 General 7 3.1 Qualification .7 3.2 Quality Control .7 3.3 Wr
27、itten Procedures .7 3.4 Miscellaneous .7 3.5 Protective Coating System8 3.6 Coating Repairs.8 3.7 Paint Storage.9 3.8 Steel Storage After Painting .9 3.9 Final Acceptance.9 Section 4 Material Acceptance . 10 4.1 Paint 10 4.2 Abrasive Media Condition10 iii Guide Specification for Application of Coati
28、ng Systems with Zinc-Rich Primers to Steel Bridges Section 5 Surface Preparation. 11 5.1 Material Anomalies.11 5.2 Pre-Cleaning .11 5.3 Abrasive Blast Cleaning .12 5.4 Bolts (Fasteners) .12 Section 6 Paint Application 15 6.1 General15 6.2 Coatings on Faying Surfaces 16 6.3 Intermediate and Topcoat .
29、16 iv Guide Specification for Application of Coating Systems with Zinc-Rich Primers to Steel Bridges Introduction This guide represents a consensus on best industry practice for shop application of zinc rich primers to previously uncoated bridge steel and includes the proper preparation of the steel
30、 surfaces and the mixing, application, and cure of coatings. To simplify the application parameters for a system based on zinc-rich primers on new steel bridges, a series of charts have been developed. These charts provide a convenient summary listing the detailed requirements for surface preparatio
31、n, environmental conditions, coating application, curing, and verification testing. The guide addresses a three-coat system consisting of primer, intermediate coat, and topcoat, but is appropriate for application of a two-coat system or primer only. Environmental, containment, and safety issues refe
32、renced herein are outside the scope of this guide and should be addressed in other documents. This guide uses mandatory (imperative) language to assist owners and specifiers with development of contract language. 1 Guide Specification for Application of Coating Systems with Zinc-Rich Primers to Stee
33、l Bridges Section 1 Definitions 1.1 Applicator (“Shop”) Person or contractor who applies a coating. 1.2 Breaking the Corner (Corner Chamfering) Commentary: A process by which a sharp corner is flattenedby passing a grinder or other suitable device along the corner, normally in a single pass. The bre
34、aking (flattening) of a sharp corner is sketched below: Care should be taken to ensure that no new sharp edges are raised by the grinding. Extensive testing has proven shop grinding of corners is unnecessary for improving coating coverage and corrosion protection when using ethyl silicate inorganic
35、zinc-rich primer systems with minimum zinc loading of 83%. Limited testing has also shown that while organic zinc-rich materials sometimes tend to draw thin on square corners, they cover well on corners that are merely flattened (“breaking the edge”). Therefore, when organic zinc-rich materials are
36、applied to corners that have been “cut” (sawed, burned, or sheared), the corners must either be “broken” or stripe coated per SSPC-PA 1, Section 6.6, “Striping.” 1.3 Checking The fine cracking that develops in paint filmsduring prolonged curing and/or weathering thatdoes not penetrate to the underly
37、ing surface.ASTM D 660 is the “Standard Test Method forEvaluating Degree of Checking of ExteriorPaints.” 1.4 Conformance Certification A verification issued by the coatingmanufacturer confirming that a particular batchof product was produced in accordance with the2 Guide Specification for Applicatio
38、n of Coating Systems with Zinc-Rich Primers to Steel Bridges manufacturers standard. This standard of performance for the product must havepreviously been approved or accepted by theOwner. 1.5 Corner The intersection of two surfaces. 1.6 Edge An exposed, through-thickness surface of aplate or rolled
39、 shape, for example the as-rolled side face of a beam flange, channel flange orangle leg, or as a result of thermal cutting,sawing, or shearing. Edges may be planar orrounded, and either perpendicular or skewed toadjacent faces. 1.7 Edge Grinding (Edge Conditioning) Commentary: Very shallow grinding
40、 or other pre-blast cleaning preparation of thermal cut edges(TCEs) to remove a thin, hardened layer left byresolidification. It does not include grindingrequired by the D1.5 Bridge Welding Code orASTM A 6 to remove cutting, handling ormaterial anomalies. Edge grinding can be used to remove martensi
41、te, a hardened form of steel that may occur due to rapid resolidification following thermal cutting. This layer is typically very thin, about 0.01“ to 0.02“ (0.25 to 0.50 mm) thick, and is dependent upon the steels chemistry and thickness. Light grinding is generally sufficient to remove this materi
42、al, and is only necessary if the hardness interferes with achieving the desired profile during blast cleaning. The presence of martensite and/or the small grooves normally left by thermal cutting are not a fatigue or stress concentration problem. 1.8 Fastener A mechanical device used to attach two o
43、r moreitems together; e.g., a bolt, nut and washer. 1.9 Faying Surfaces Contacting surfaces where joints in steel structures are fastened together, formed, forexample, by fastening devices. 1.10 Limited Access Areas Partially or completely enclosed surfaces, themajority of which are not visible with
44、out the useof special devices such as mirrors, and not readily accessible for coating by routinemethods. 3 Guide Specification for Application of Coating Systems with Zinc-Rich Primers to Steel Bridges 1.11 Mud Cracking A coating defect resembling the irregularcracking of drying mud that typically a
45、risesduring the curing of a relatively inflexiblecoating applied too thickly. 1.12 Qualified Product A coating product which has been approvedbased on testing to a Federal, State, or regionalagency, or a test protocol (e.g., AASHTO,NEPCOAT, NTPEP, or DOT protocol). 1.13 Sharp An acute corner or prom
46、inence that is able orappears to be able to cut human flesh. 1.14 Spot Priming Application of primer paint to localized spotswhere the substrate is bare or where additionalprotection is needed because of damage to, or deterioration of, a former coat. 1.15 Stripe Coat A coat of paint applied only to
47、edges or to weldson steel structures before or after a full coat isapplied to the entire surface. The stripe coat isintended to give those areas the required dryfilm thickness (DFT) to resist corrosion. 1.16 Visible Coating Defects Imperfections that may be detected byexamination without magnificati
48、on. Theseinclude runs, sags, lifting, chipping, cracking,spalling, flaking, mudcracking, pinholing, andchecking. 1.17 Weld Spatter, Tight Beads of metal produced during the weldingprocess with adequate thermal energy to adhereon metal adjacent to the weld area. The dropletsretain their individual sh
49、ape but have sufficientfusion to resist removal by hand scraping with aputty knife, per SSPC-SP 2. 4 Guide Specification for Application of Coating Systems with Zinc-Rich Primers to Steel Bridges Section 2 Reference Standards Unless otherwise noted in the contract, the latest edition of the following standards andregulations in effect at the time of contract letting form a part of this guide. A copy of applicablereference standards shall be available at the painting facility. 2.1 American Association of State Highway and Transportation Officials (AASHTO) 2.1.1 AASHTO M 160, Standard
