CATEGORY 400 STRUCTURES SECTION 464 — EPOXY PROTECTIVE COATINGS FOR CONCRETE
464.01 Description
Furnish and apply epoxy protective coatings to concrete surfaces.
464.02 Materials
Sand 901.01 Epoxy Protective Coatings 917.01
464.03 Construction
Coatings shall not be applied until 30 days after removal of the forms. Abrade all surfaces to be coated by abrasive blasting, water blasting, or other mechanical means to provide a surface profile for improved adhesion. Ensure that the surface is sound, clean, thoroughly dry, and free of oil, grease, curing compound, and other foreign matter before applying the first epoxy protective coating. Apply two coats to the specified areas of the structure. Each application shall follow a dry weather period of at least two consecutive days and be within the time frame recommended by the manufacturer. Mask adjacent areas not to be coated or otherwise protect to prevent staining.
464.03.01 Mixing and Application. Mix and apply according to the manufacturer’s
recommendations. Apply by brush or roller. Do not apply to piers and abutments until the structural steel masonry plates are in place.
464.03.02 Coating Requirements. Sprinkle an excess of sand on the second epoxy coating on
the top surfaces of the piers and abutment bridge seat areas between beams pads while it is still wet. When it has hardened sufficiently to resist marring, remove sand not adhering to the coatings. Coat the following areas:
a.For abutments under a transverse joint, apply the coatings to the entire horizontal surface of the bridge seat areas (between and around the beam pads) and all exposed surfaces of the beam pads, and the entire contiguous vertical faces of the backwalls and cheek walls. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
b.For piers under a transverse joint, apply the coatings to the entire horizontal surface of bridge seat areas (between and around the beam pads), and all exposed surfaces of the beam pads.
c.For prestressed beams or slab panels, apply coatings in the shop to the limits as specified in 440.03.15(c) after the strands have been detensioned and cut. Touch up any coatings that were damaged in the field after the beams or slabs have been erected.
464.03.03 Material Precautions. Use the manufacturer’s Material Safety Data in handling and
use of the material.
464.03.04 Repairs. Repair all damage to the structure resulting from the coating operations,
including damage to the epoxy protective coating. Perform epoxy protective coating repairs according to the manufacturer’s recommendations.
464.04 Measurement and Payment
The payment will be full compensation for both coats and all material, labor, equipment, tools, and incidentals necessary to complete the work.
464.04.01 Epoxy protective coatings for concrete for which no specific item is included will not
be measured but the cost will be incidental to other pertinent items.
464.04.02 Epoxy protective coatings for concrete will not be measured but will be paid for at the
Contract lump sum price for the pertinent Epoxy Protective Coating item.
464.04.03 Epoxy protective coatings for concrete will be measured and paid for at the Contract
unit price per square foot for the pertinent Epoxy Protective Coating item.
464.04.04 Epoxy protective coatings for prestressed elements will not be measured but will be
paid for at the Contract lump sum price for the pertinent Prestressed Concrete Beams or Prestressed Concrete Slab Panels item. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS 465 — MISCELLANEOUS COATINGS FOR METAL (STEEL) CATEGORY 400 STRUCTURES SECTION 465 — MISCELLANEOUS COATINGS FOR METAL (STEEL)
465.01 Description
Furnish and apply various coatings to metal surfaces as specified. Refer to Sections 435 and 436 for cleaning and painting new and existing bridge structural steel, respectively.
465.02 Materials
Paint System C 912.05 Fusion Bonded Epoxy Powder Coating for Steel 917.02 Fusion Bonded Polyester Powder 917.03 Hot Dip Galvanized Zinc A123, A153, and 465.03.05(c) Galvanizing Repair A780 and 465.03.05(c) Use paint and powder coating material selected from the Qualified Products List (QPL).
465.03 Construction
Perform cleaning and coating in an approved environmentally controlled plant. Provide the Administration with access to each part of the process. The Administration reserves the right to witness or perform any Quality Assurance testing on a random basis. Use polyester powder coating when coatings other than paint are specified for steel or aluminum or as directed. The powder coating applicator shall have demonstrated the ability to properly apply and cure the materials of the system and shall be on the Administration’s Approved List of Applicators prior to application of any coatings. Coaters shall be qualified for paint and for powder coating as specified in 435.01.04. Galvanizers shall be on the Administration’s Approved List of Galvanizers.
465.03.01 Nongalvanized Carbon Steel. Prepare steel metal surfaces as specified in
436.03 10(h). All cut edges shall be broken. Clean all items to be coated of any oil or grease
according to SSPC SP-1 and abrasive blast to Near White according to SSPC SP-10. Remove weld spatter, slivers, hackles, or other defects. Protect cleaned surfaces from high humidity, rainfall, and surface moisture. Do not allow cleaned surfaces to flash-rust. Ensure that the blast profile is 2 mils to 3 mils according to D4417, Method C. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
Source: Maryland Standard Specifications for Construction and Materials, 2025 Edition. Pages 586–587 of 1,113.