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Iowa Demonstration Project: Accelerated Bridge Construction on US 6 over Keg Creek
To promote the innovations—prefabricated bridge elements, high-performance materials and accelerated construction methods—the Iowa DOT in conjunction with the FHWA and SHRP 2 sponsored a 1-day showcase. The showcase was held October 28, 2011, at the Hilton Garden Inn in Council Bluffs. The event featured presentations by representatives of the FHWA, Iowa DOT, SHRP 2, Iowa State University, HNTB Corporation, and the contractor, followed by a field trip to the project site to observe the forming of the deck joints with UHPC.
Figure 27. Photo. Sandra Larson gives opening remarks at the showcase.
The showcase attracted 80 registered attendees from 14 states including other DOT’s, transportation authorities, and the construction industry. The appendix contains the workshop agenda. John Adams and Sandra Larson of the Iowa DOT provided the introduction and opening remarks. Neil Hawks presented an overview of the SHRP 2 program, followed by an overview of the HfL program by Lubin Quinones.
Benjamin Beerman from the FHWA provided a national perspective on prefabricated bridge elements and systems (PBES) and the FHWA Every Day Counts (EDC) initiative. He examined various elements of PBES construction and decision making tools on-line with the agency to help DOT’s with their projects.
Norm McDonald of the Iowa DOT shared the State’s experiences with PBES by highlighting completed projects from around the State plus PBES projects that address specific bridge performance issues, such as bridge approach settlement.
Bala Sivakumar of the HNTB Corporation discussed innovative bridge designs for rapid renewal from the SHRP 2 Project R04. He explained three tiers of ABC concepts from the SHRP 2 program, including tier 1 projects in which bridges are replaced overnight or on the weekend utilizing such technology as self-propelled modular transporters or lateral slide techniques; tier 2 projects completed in 1 to 2 weeks, typical with PBES; and the tier 3 concept of accelerating a statewide bridge program. Example projects and goals of each tier were presented.
Mike LaViolette of the HNTB Corporation detailed the superstructure and substructure element designs of the demonstration project in his presentation. This presentation included aerial photos taken at intervals during construction, which gave the audience a clear understanding of the construction sequence. Ahmad Abu-Hawash of the Iowa DOT gave the owner’s perspective of PBES versus conventional bridge construction. He outlined the Iowa DOT's decision-making process used to compare direct costs, user costs, project goals, and related criteria between conventional and ABC delivery approaches.
Mike LaViolette presented the contractor’s perspective of PBES versus conventional bridge construction on behalf of Kim Triggs of Godberson-Smith Construction who was not available to present. Vic Perry of Lafarge North America, Inc., and Matt Rouse of Iowa State University discussed research findings regarding the particular UHPC used in this project. UHPC was a popular topic during the showcase, and participants took the opportunity to discuss in detail the material properties and application in this project. Figure 28 shows participants discussing UHPC next to a longitudinal joint.
Figure 28. Photo. Showcase participants discuss UHPC.