SECTION 416—W ATERPROOFING
416.01 Description
This work shall consist of furnishing and applying waterproofing material on concrete bridge decks or other surfaces as shown on the plans.
416.02 Materials
Epoxy-resin compounds and aggregates for surface application shall conform to Section 243. Epoxy resin shall be T ype EP-5, low viscosity, or T ype EP-7 for concrete bridge deck applications and T ype EP-3B/EP-3T for other bridge elements such as concrete beam ends and concrete substructure seat applications. Epoxy T ype EP-3B shall be dark grey in color, unless otherwise specified on the Plans or elsewhere in the Contract.
416.03 Procedures
Epoxy-resin: Containers, tools, and mechanical equipment shall be free from solvents, loose material, and deposits of hardened material. The Contractor shall not apply epoxy resin when the concrete surface or the ambient air temperature is below 50 degrees F unless otherwise permitted by the manufacturer’ s instructions.
a.Surface preparation: Surfaces on which epoxy compounds are to be applied shall be free from grease, dirt, dust, paint, mill scale, curing compound, laitance, and other foreign material which may prove deleterious to bonding. Concrete surfaces on which epoxy compounds are to be used shall be abrasive blast cleaned suf - ficiently to expose the sound concrete. Surfaces that are not to receive epoxy compounds shall be protected from abrasive blast cleaning. Immediately following abrasive blast cleaning, the surface shall be thoroughly cleaned according to the epoxy resin manufacturer’ s instructions. Before epoxy compounds are applied to metal surfaces, surfaces shall be abrasive blast cleaned to a bright metallic luster according to Method 5 of Section 411. Wood surfaces shall be abrasive blast cleaned as needed to obtain proper adhesion of the epoxy. 416.03
b.Mixing: Epoxy mortar shall be made by blending sand, epoxy resin, and hardener in accordance with the manufacturer’ s instructions. Batch sizes shall be limited to the maximum batch size recommended by the manufacturer. Mixed epoxy compounds shall be used within the manufacturer’ s specified pot life. The Engineer will not permit the addition of solvents or other materials to the mixture.
c.Application: Masking shall be used to form straight edges. The Contractor shall prevent epoxy resin from flowing into or over expansion joints. The first coat of epoxy resin shall be applied at the rate of 1 gallon per 75 square feet. Sand shall be broadcast in sufficient quantity, approximately 11 pounds per square yard, to cover the epoxy completely. Sand shall be firmly embedded so that at least 95 percent of the deck area displays a sand surface after brooming. The Contractor shall not broom the epoxy until the epoxy resin has cured sufficiently to prevent tearing. After curing, unbonded sand shall be broomed from the surface and may be reused if uncontaminated and has acceptable gradation. The second coat of epoxy resin shall be applied at the rate of 1 gallon of epoxy per 50 square feet. Requirements pertaining to masking, epoxy, flow, sand broadcasting, percentage of embedment, curing, and brooming shall also apply to the second coat of epoxy resin. The Engineer will not require sand to be broadcast into applications of Epoxy T ype EP-3B/EP-3T used for concrete beam ends and concrete substructure seat applications. The Contractor shall make suitable provisions to prevent water from getting between the water - proofing and the waterproofed surface at the edges of the waterproofing system and at any point where it is punctured or interrupted by appurtenances such as drains or pipes. The waterproofing system shall be applied to areas noted on the Plans or elsewhere in the Contract. When applied to prestressed concrete slab and box beam units for new construction, application shall be made at the prestressing plant. Joints and damaged areas shall be waterproofed after erection.
d.Curing: Curing time shall conform to the manufacturer’ s recommendations. During this time, both pedestrian and vehicular traffic shall be barred from freshly placed epoxy surfaces.
416.04 Measurement and Payment
Waterproofing – Epoxy Resin (Type) will be measured in square yards and will be paid for at the contract unit price per square yard of completed surface as shown on the plans for the type specified. The cost of waterproofing applied to prestressed concrete members before erection and the cost of water- proofing joints and damaged areas shall be included in the price bid per member. Payment will be made under: ——————————————————————————— Pay Item Pay Unit——————————————————————————— Waterproofing – Epoxy Resin (T ype) Square yard——————————————————————————— 416.03
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Source: Road and Bridge Specifications, 2020 Edition. Pages 615–616 of 1,065. View official source ↗