411 Page 277411 SHOP PAINTING
411.1DESCRIPTION
This work consists of shop cleaning metal surfaces and shop application of the specified coating system.
411.2MATERIALS
Coatings, including primer, intermediate (if used), finish, and field repair coats will all be from the same manufacturer and will be one of the systems from the Department’s Approved Product List for shop paint (new construction).
411.3CONSTRUCTION REQUIREMENTS
A.General: The coatings will be applied in accordance with the manufacturer's recommendations. A written copy of the manufacturer’s recommendations, including product data sheet, will be furnished to the Department prior to painting. The recommendations will indicate the recommended minimum and maximum dry film thickness (DFT) for each coating layer of the system, mixing and thinning directions, recommended spray nozzles and pressures, minimum drying time, maximum time to recoat, cure time based on application temperature, maximum coating application temperature, and the recommended procedures for coating galvanized bearings, bolts, nuts, and washers. Coatings will be shipped from the manufacturer with a date stamp to indicate expiration. Coatings outside of the expiration window will not be used. Whenever the manufacturer’s recommendations are more stringent than the provisions of this section, the manufacturer’s recommendations will apply. Coatings will not be applied when the surface temperature is below 40F or above 90F, when the air is misty, when the humidity exceeds 85%, when the surface temperature is less than 5F above the dew point, or when conditions are otherwise unsatisfactory. Coatings will not be applied when the metal is hot enough to cause the paint to blister or produce a porous paint film. Coatings will not be applied on damp or frosted surfaces. Coatings applied under cover in damp or cold weather will remain under cover until dry or until weather conditions are suitable. Coatings will be applied in a uniform, even coat and will be worked into all corners and crevices. Coatings will be applied with approved equipment. On surfaces which are otherwise inaccessible the coating may be applied with sheepskin daubers. Coatings that do not meet the requirements of this section will be removed. The metal will be reblasted, cleaned, and recoated at no expense to the Department. During coating application, scaffolding or other safe devices will be provided to permit inspection of the steel. The Contractor will provide protective devices as necessary to prevent damage to the work and to other property or persons from all cleaning and painting operations. 411 Page 278Paint or paint stains that result in an unsightly appearance on surfaces not designated to be painted will be removed or obliterated by the Contractor at the Contractor’s expense. B.Coating New Structures: 1.Surface Preparation: Surfaces to be coated will be abrasive blast cleaned to a near white finish, in accordance with SSPC SP 10. Abrasives used for blast cleaning will be steel shot, mineral grit, or manufactured grit and will have a gradation that provides a uniform steel surface profile of 1 to 3 mils. Air compressors used for surface preparation will have a functioning moisture separator to reduce steel surface contamination. Fins, tears, slivers, and burred or sharp edges will be removed by grinding and the area reblasted to provide the profile specified. Blast residue will be removed from steel surfaces with a commercial grade vacuum cleaner equipped with a brush type cleaning tool, or by double blowing. Steel will be kept dust free and dry. Steel will be primed within 24 hours after cleaning. 2.Mixing and Thinning Paint: The coating will be thoroughly mixed, so the pigment is completely in suspension and the consistency is uniform. The coating will be strained over a sieve having openings no larger than a #50 sieve. After straining, the mixed coating will be kept under continuous agitation until application is completed. When thinning is necessary for proper application, it will be accomplished in accordance with the manufacturer’s recommendations. 3.Coating Application : The prime coat, the intermediate coat (if used), and the finish coat will be applied in the shop, except where specified otherwise. After the surface has been satisfactorily cleaned, the primer will be applied producing a uniform even coating bonded with the metal. The finish coat will not be applied until the prime and intermediate coats (if used) have been determined acceptable by the Department. The minimum curing time between coats will be as recommended by the manufacturer. Coatings will be applied in accordance with SSPC PA1. Surfaces to be coated include contact surfaces of bolted field splices. The dry film thickness
recommendations. The contact or faying surfaces of bolted field splices, bolted shop splices, and any other bolted faying surface, will be given a prime coat only and masked during subsequent coating operations. DFT will be measured in accordance with SSPC PA 2. When measuring DFT in accordance with SSPC PA 2, the areas to be measured will be set up to ensure the total DFT (primer, intermediate (if used), and top coat) is not less than the DFT recommended by the manufacturer on the following surfaces: top of the bottom flange, top of horizontal stiffeners, and top surfaces of diaphragms. Bolted shop connections and bolted cross frames or diaphragms will be removed and disassembled prior to the abrasive blasting and coating of the girders. The removed parts will be abrasive blasted and primed separately, allowed to dry, reassembled, and the bolts fully tightened. 411 Page 279Galvanized components: including nuts, bolts, and washers will be cleaned after assembly with a mineral spirit solvent followed by a hot water rinse and thorough drying, given a prime coat, an intermediate coat (if used), and then coated with the finish coat. To avoid runs, bubbles, and sags each coat will be applied in multiple passes of the spray gun (mist coat) with each pass separated by several minutes. If applying a polyurethane top coat over an inorganic zinc primer, a mist coat is required. Where excessive coating thickness produces “mud cracking”, the coating will be scraped back to soundly bonded coating and the area recoated. Areas of deficient primer thickness will be thoroughly cleaned with power washing equipment to remove all dirt. The area will then be wire brushed, vacuumed, and recoated. Each member will have an erection mark for field identification. A diagram will be furnished showing the erection marks. The mark will not be visible after erection. 4.Handling and Shipping: Material will not be loaded for shipment until the shop coating has been determined acceptable by the Department. Extreme care will be exercised in handling the steel in the shop, during shipment, during erection, and during subsequent construction of the bridge to prevent damage to the coating. Overhang brackets will be padded where they bear on the web. Deck formwork will be mortar tight to prevent leakage onto the girders. The coating will be protected from all chains, slings, hooks, and other apparatus used to lift or turn the coated steel. During shipment, padding will be used to prevent damage from rubbing and other causes. Diaphragms and other parts will be padded and packed to prevent damage. The steel will be stored off the ground on padded supports to prevent damage. Girders will be stored so they cannot fall on or touch one another. The steel will not be shipped until the contractor has the necessary equipment for handling and storing the steel. The Contractor's proposed methods for handling and storing the steel will be discussed at the preconstruction meeting. 5.Field Repair: All field repairs will be made in accordance with the manufacturer's recommendations. Field repairs will consist of application of a prime coat, an intermediate coat (if used), and a finish coat. Paint used for field repairs will be the same paint system as the paint applied in the shop. Field repair will be accomplished after the deck is poured and falsework removed and includes painting galvanized bolts, primed areas of splice plates, diaphragm connections, and other areas requiring touch up or finish painting. Faying surfaces of bolted connections, including splice plates, will be coated only with the primer. The structural steel will have oil and grease removed by wiping with clean rags soaked in an appropriate solvent in accordance with SSPC SP1. The steel surfaces will then be power tool cleaned in accordance with SSPC SP3 to provide a rust-scale free surface. Abrasive blast cleaning as per SSPC SP6 will be required on areas where heavy rusting is causing rusting scale. After satisfactory surface preparation has been completed, the steel will be given a prime coat. After the prime coat has properly cured, an intermediate coat (if used) will be applied. After the intermediate coat (if used) has properly cured, a finish coat will be 411 Page 280applied. The DFT of the prime coat, intermediate coat (if used), and top coat will meet the manufacturer’s recommendations. Coatings will be applied in accordance with SSPC PA1. DFT will be measured in accordance with SSPC PA2. The prime coat, intermediate coat (if used), and finish coat may be applied by spraying, brushing, or rolling as determined by manufacturer’s recommendations. The contact or faying surfaces of bolted field splices, bolted shop splices, and any other bolted faying surface, will be given a prime coat only. C.Repainting Existing Structures: Repainting existing structures will conform to Section 412.
411.4METHOD OF MEASUREMENT
Measurement for the item Bridge Painting will not be made.
411.5BASIS OF PAYMENT
Bridge Painting will be paid for at the contract lump sum price. Payment will be full compensation for surface preparation, furnishing and applying the coating, field repair of damaged or uncoated areas, and other incidentals required. 412 Page 281412 BRIDGE FIELD PAINTING, REPAINTING, AND PAINT RESIDUE CONTAINMENT
412.1DESCRIPTION
This work consists of the removal, containment, and disposal of existing paint on steel surfaces, preparing the steel surfaces, and the field painting/repainting of steel surfaces.
412.2MATERIALS
A.Solvent Cleaners: Will be as recommended by the paint manufacturer. B.Paint System: Coatings, including primer, top coat, and field repair coats will be from the same manufacturer and, unless otherwise specified, will be one of the systems from the Department’s Approved Products List for bridge field paint. The Contractor will supply the Engineer with a copy of the manufacturer’s data sheets prior to painting. C.Paint Color: When only spot painting the work affected areas, the contractor will obtain a paint chip sample from the structure and submit the structure sample and a paint chip from the paint supplier to the Office of Bridge Design for approval. Prime Coat: The prime coat color will sharply contrast with the top coat, as approved by the Engineer. Intermediate Coat (if used): The intermediate coat (if used) color will sharply contrast with the top coat, as approved by the Engineer. Top Coat: The color will match existing paint unless otherwise specified.
412.3CONSTRUCTION REQUIREMENTS
A.Surface Preparation and Painting: Unless otherwise specified in the plan notes, the following requirements will apply to field painting and bridge repainting, Class I and Class II, as identified in the plans. 1.Solvent Cleaning: The affected areas will be visually inspected for contamination of oils and greases prior to removal of the existing paint. When contamination is found on any of the areas that will be painted, the affected area will be cleaned with solvent soaked rags and dried with clean rags. 2.Surface Preparation: a.New Steel to be Field Painted: When new steel is to be field painted, the steel surfaces to be painted will be prepared in accordance with the following: 1)Following any solvent cleaning required, surfaces to be coated will be abrasive blast cleaned to a condition equivalent to SSPC SP-6 (Commercial Blast Cleaning). Abrasive for blast cleaning will be either steel shot, mineral grit, or manufactured grit and will have a gradation that provides a uniform steel surface profile. The bare