High Strength Concrete for the Girders of Colorado's SH58 Ramp A Flyover

This article describes the Colorado State Highway 58 Ramp A Bridge in Golden, Colorado (United State), which features state-of-the-art design using variable radius, curved, U-shaped, precast concrete girders made with high strength flowable concrete. The authors note that this bridge confirms the benefits of using curved, precast concrete bridge girders to construct cost-effective, complex, long-span structures in high-profile locations. The 10-span bridge crosses Clear Creek, a bike path, three traffic openings, east and westbound Interstate-70, and eastbound State Highway 58. The roadway consists of a 38-foot wide deck designed for three traffic lanes, but currently accommodates one traffic lane and two wide shoulders. The girders were designed for handling and erection loads with varying levels of prestressing in the bottom slab. The girder concrete was specified to have a compressive strength of 6500 psi (45 MPa). A final section outlines the girder production methods. One table presents the concrete mix proportions. Readers are referred to the Spring 2010 issue of ASPIRE for more information (http://www.aspirebridge.org/pdfs/magazine/issue_14/SH58_Ramp_A_Spring10.pdf).


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  • Accession Number: 01154913
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 18 2010 8:57AM