SECTION 421—ELASTOMERIC EXP ANSION DAMS
421.01 Description
This work shall consist of furnishing and installing elastomeric expansion dams in accordance with these specifications and in conformity with the lines, elevations, and locations shown on the plans or as established by the Engineer.
421.02 Materials
Materials shall conform to Section 212.
421.03 Procedures
The Contractor shall submit working drawings showing the complete details and dimensions of the expansion dam and other pertinent information, such as required special shop fabrication necessary for installation of practical leak-proof joints, to the Engineer for review and acceptance in accordance with Section 105.10. The Contractor shall provide a factory-trained representative on the job site prior to and during the initial installation of the expansion dam. Dams shall consist of elastomeric material and metal components arranged to provide for expansion and contraction movement of the bridge deck. Expansion and contraction movements between adjacent spans of the bridge deck shall be compensated for entirely by deformation of the elastomer component, without detriment to it, and shall cause no appreciable change in the elevation of the deck surface. The opening between the rigid portions of dams at the roadway level shall be not more than 3 1/2 inches at maximum expansion. Dams shall seal the deck surface, gutters, curbs, and parapets to prevent water and other contaminants from seeping onto the substructure. Dams shall have a continuous elastomeric membrane. The Engineer may allow field-vulcanized joints for each dam in accordance with plan details. Dams shall be cast in place, with top surfaces parallel to the bridge deck. Concrete shall be placed beneath the dam in a manner to prevent the formation of air pockets or segregation in the concrete. The Contractor shall complete final sealing of the finished expansion dam as soon as possible after instal- lation. Bolt cavities shall be wire brushed and filled with sealant. Edges of the dam, exposed ends, and other areas of possible leakage shall be filled with sealant. Sealant shall be smoothed to make seamless and flush contact with mating surfaces, and any excess scraped off before the initial set.
421.04 Measurement and Payment
Elastomeric expansion dams will be measured in linear feet of dam, complete-in-place, for the movement range specified and will be paid for at the contract unit price per linear foot. The movement ranges are 0 to 2, 2 to 3, and 3 to 4 inches. This price shall include furnishing, installing, components, 421.01
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