Madison Street over I-29: two 3-span steel girder bridges, each 374 x 56 roadway;
I-29 over a railroad Two single-span steel girder brides, one 94 x 93.5 roadway and another 94 x 83.5 roadway.
The intent is to use corrosion resistant 316L clad reinforcing steel bar in one set of bridges and corrosion resistant 2205 duplex stainless steel reinforcement in the other set. This will be in conjunction with low permeability, optimized gradation concrete for the decks. This combination of materials will combine application of three recent SDDOT research efforts to: optimize fly ash content for low permeability (SD2000-06); optimize aggregate gradation to provide strength while minimizing shrinkage cracking SD2002-02); and use non-corrosive, stainless steel clad reinforcing steel (SD2002-16). The goal of this combination is a design for new bridge decks that can reliably achieve a 75-year life with minimal deck maintenance. This research addresses the evaluation of the innovative construction materials used and the initial performance of the structures.