The first project demonstrating precast prestressed concrete pavement (PPCP) technology for bridge approach slab construction was installed at both ends of a bridge on Highway 60 near Sheldon, Iowa.
The approach slabs were tied to the bridge abutments as part of an integral approach slab. The approach slab panels were designed to accommodate a 30 degree bridge skew and a “rooftop” crowned pavement section. The panels were installed over a crushed limestone base using partial-width precast panels in order to simulate lane-by-lane construction for future applications. Longitudinal post-tensioning was completed from the ends of each approach slab, while transverse post-tensioning was completed from the outside edge of the pavement.