713 - QUALIFICATION OF FIELD WELDERS
700-64 basis by testing in the vertical and overhead fillet weld positions according to AASHTO/AWS D1.5 Section
5.26.3.1. See D1.5, Figure 5.21 for the test. No welder’s card will be issued to fillet welders. The approval by the Regional Materials Engineer to accept this type of qualifica tion will be based on the stru cture type, location of work within structure, and the overall complexity of work. 713.8 QUALIFICATION FOR FRACTURE CRITICAL WELDING Perform fracture critical welder qualification according to AASHTO/AWS D1.5, Section 12. 713.9 REGIONAL MATERIAL’S LABS Kansas City Regional Materials Lab P.O. Box 860462 Shawnee Mission, KS 66286-0462 Phone: 913-441-0346 Wichita Regional Materials Lab: 3200 E. 45 th St. N. Wichita, KS 67220 Phone: 316-744-0421 714 - PAINTING STRUCTURAL STEEL
700-65 Section 714
PAINTING STRUCTURAL STEEL 714.1 DESCRIPTION Prepare the structural steel surfaces , and paint the structural steel as shown in the Contract Documents. Provide environmental protection as necessary. B I D I T E M S U N I T S B r i d g e P a i n t i n g ( * ) L u m p S u m Environmental Protection Lump Sum P o w e r W a s h L u m p S u m *Type of Paint System 714.2 MATERIALS Provide paint materials that comply with DIVISION 1800 . Formulate the inorganic zinc or organic zinc coating to provide a tint which distinctly contrasts with blast cleaned metal surfaces and the finish coat. 714.3 CONSTRUCTION REQUIREMENTS
a.General Requirements for Painting Structural Steel.
1.Surface Preparation Before Appl ying The Prime Coat. Blast all su rfaces with abrasives to produce a height of profile of 1 to 3 mils. Clean structural steel surfaces to meet the Society for Protec tive Coatings’ (SSPC) specification SSPC-SP10, Near-White Blast Cl eaning. Limit staining to a maximum of 5% of each square inch of surface area. If specified (such as for unpainted surfaces of weatheri ng steel or when repainting existing bridges in kind), clean structural steel surfaces to meet SSPC-SP6, Commercial Blast Cleaning, except wet blasting will not be permitted. Staining is limited to a maximum of 33% of each square inch of surface area. If the original surface is pitted, slight residues of rust and paint may be left in the bottom of pits. Staining may consist of slight shadows, slight streaks or minor discoloration caused by stains of rust, stains of mill scale or stains of previously applied paint. Wh en viewed without magnification, the blast cleaned surface shall be free of visible oil, grease, dust , dirt, mill scale, rust, coating, oxides, corrosion products and other foreign matter. Remove all machine cutting oil by cleaning machined surfaces (ANSI 125 micro-inch or smoother). Carefully mask the machin ed surfaces before blast cleaning th e remaining surfaces of the member. After blast cleaning, remove any trace of blast products . Take care to remove abrasives from pockets and corners. Give the blast cleaned surfaces a prime coat of pain t within 12 hours of clean ing. Re-clean the blast cleaned surfaces if rust tinge appears before the prime coat is applied.
2.Weather Conditions. Check the air temperature, the steel temperature and the dew point before painting begins each day, and after each suspension of painting due to weather or temperature, if painting is to resume. Do not apply paint if the ambient air temperature is below 40°F, when the air is misty, when the steel temperature is 5º or less above the dew point, or if the Engineer determines conditions are unsatisfactory for painting. Do not apply paint on damp or frosted surfaces. Stop paint application if the Engineer determines the air temperature is so high that the spray dries before reaching the su rface, resulting in a dry, powdery coating.
3.Mixing and Thinning Paint. Thoroughly mix the paint and keep the pigment in suspension. Strain the mixed paint when recommended by the manufacturer. If multi-component inorganic zinc primer is used, follow the manufacturer’s instructions regarding the amount and manner of adding the zinc dust to the liquid portion. Strain the mixed paint through a metal screen having a mesh recommended by the manufacturer. Mix multi- component inorganic zinc paint fresh each day and do not use it past the pot life time stated in the manufacturer’s literature. 714 - PAINTING STRUCTURAL STEEL
700-66 The Engineer will permit paint thinning if required fo r proper application, but only as recommended by the
manufacturer. If thinner is used, add it to the paint during the mixing process. Do not add additional thinner after the paint is thinned to the proper consistency. Use thinner recommended by the manufacturer for inorganic zinc paints. Inorganic zinc paint should not require heating in cool weather, but is permitted provided ca re is taken that the paint is protected from all moisture.
4.Application of Paint. Apply the paint according to the manufact urer’s instructions. Provide the Field Engineer with a printed copy of the paint manufacturer’s application instructions. Apply the paint using either a conventional or an airless sprayer. Spray from a continuously agitated pot. Apply uniform coatings in tight contact with the metal. Work the coating into all corners and crevices. Apply a coating that is free of all defects. Allow ample time for each paint coati ng to dry. Do not apply the next co at of paint until the previous coat is inspected by the Engineer and found dry and hard throughout the entire film thickness. Remove and replace defective or unauthorized paint. Prepare the surfaces for repainting and repaint the areas according to the requirement s for painting structural steel. When the finish coat is complete, stencil (in black paint) the date the bridge was painted and the code representing the type of paint system used on the bridge. Stencil the legend on the right side of the outside face of the far right stringer near each end of the bridge. Use capital letters, 2 to 3 inches in height. The date stencil shall contain the word "PAINTED" and show the month and the year that the painting was completed. Make the paint system code selection from the following list: Inorganic Zinc/Acrylic IZ/A Inorganic Zinc/Polyurethane IZ/P Organic Zinc/Acrylic OZ/A Organic Zinc/Polyurethane OZ/P
5.Staging and Scaffolding. Use adequate staging an d scaffolding while painting the structural steel. Do not climb or work on the finished painted members. Provide the Engineer with safe means (such as scaffolding, snoopers or cherry pickers) to inspect any portion of th e structure during the cleaning and painting operations.
6.Protection of Pedestrians and Property. When painting on the project site, protect all pedestrians, vehicles (on or underneath the bridge), adjoining propert y along the right-of-way, pipes or ducts owned by utility companies, and portions of the bridge superstructure and substructure against damage or disfigurement from paint material. The Contractor is responsible for repairing any damage resulting from the painting operations.
7.Maintaining Traffic on Existing Bridges. Provid e traffic control as shown in Contract Documents and SECTION 805 . Unless traffic is detoured, maintain traffic on the existing bridge at all times during the work of cleaning and painting. At the option of the Contractor when work is being performed, ½ of the roadway on that span may be closed to traffic, with on e way traffic being maintained over the other half of the roadway. At all other times when work is not being performed, keep the entire bridge roadway open to traffic.
b.Shop Painting Structural Steel (Non-Weathering). The application of the prim e coat in the shop must comply with the general requirements for painting st ructural steel, with thes e additions and exceptions: Unless shown otherwise in the Contract Documents, apply 1 coat of inorganic zinc primer to the structural steel in the shop. Mask machin ed surfaces prior to painting. Use primer th at is tinted to contrasts (in color) with the blast-cleaned steel and with th e finish coat of paint. Apply 2 primer coats (not less than 6 mils total thickness) to surfaces that are not in contact with the concrete, but that will be inaccessible after assembly or erection. Apply the second coat between 4 and 24 hours after application of the first coat. Prime the welded stud shear connectors (including the underside of the stud head). Given the complexity, areas of thin primer and some shadows are permissible on the top 1 inch. Except where otherwise indicated, coat all blast clean ed surfaces of the structur al steel, including contact surfaces of high strength bolted connectio ns and areas in contact with concrete. The dry film thickness of the prime coat shall be 3 to 6 mils on flat areas. More thickness is allowed in fillet areas if there is no evidence of mud cracking, and if the coating is tight. The dry film thickness is measured from the peaks of the blast profile to the surface of the paint. For contact surfaces of high strength bolted connections, the dry film thic kness shall be 1.5 to 3 mils. Both sides of steel plates that have holes for high strength fasteners are consider ed contact surfaces because they come into contact with other steel plates, nuts, washers or fastener heads. Apply 1.5 mils dry film thickness prime coat to top flanges of structural steel members that will have welded stud shear connectors applied in th e field. Do not apply the prime coat to surfaces within 6 inches of field
Source: Kansas Standard Specifications for State Road and Bridge Construction, 2015 Edition. Pages 395–397 of 978.