BRAKER LANE BRIDGE - HIGH STRENGTH CONCRETE IN PRESTRESSED BRIDGE GIRDERS

A bridge over Interstate I-35 at Austin, Texas, was designed and built using Texas Type C girders fabricated with high strength concrete. Compressive strengths required were 7400 psi (51 MPa) within 17 hours and 9600 psi (66MPa) at 28 days, which allowed a design with fewer girders and increased girder spacing compared to a design with normal strength concrete. Test results on production quality high strength concrete containing microsilica are presented.