Description: Work under this item shall consist of all materials, tools, and labor necessary for the performance of all work to form, cast, finish, cure, and test Ultra High Performance Concrete (UHPC) where required per plans for Beam End Repairs with UHPC. This item also includes surface preparation of existing steel surfaces in contact with UHPC and sealant applied along the exposed interfaces between UHPC panels and steel girders. The Contractor shall not perform any repair work without prior approval by the Engineer for locations and limits. This work shall also include removal of existing fixed bearing anchorages and installing a sealer plate at the locations of the UHPC repairs as identified on the plans. Materials: Materials shall conform to the following: Ultra High Performance Concrete (UHPC): The UHPC shall be mixed on Site from prepackaged components, pre-proportioned by the UHPC Supplier. Components: The following materials shall be as recommended by the UHPC Supplier: (a) Fine Aggregate (b) Cementitious Material and any replacement materials, such as silica fume (c) Steel Fibers (must be in accordance with Article 1.06.01 – Buy America) (d) Liquid Admixtures (such as super plasticizers or accelerators) Water: Water for mixing shall meet the requirements of M.03.01-4 and the temperature at mixing shall be per UHPC Supplier recommendations for use in the UHPC mix.
