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Full Depth UHPC Waffle Bridge Deck Panels
Highways for LIFE Partnerships 2009 Award $382,971
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Need for Innovation
Bridge engineers are seeking new ways to build better bridges, reduce work zone travel delays, and
improve repair techniques thereby reducing maintenance. Additionally, owners are challenged with replacing
critical bridge components (particularly bridge decks) during limited or overnight road closure
periods. Precast panels manufactured from UHPC can provide significant durability improvements to bridge decks due to the
high strength, extremely low permeability, and improved connection details inherent in the
system. The use of this innovation will result in reduced construction time for new and
Coreslab Structures (Omaha), Inc., demonstrated waffle design modular panels on a bridge project in Wapello County, Iowa. The bridge deck panels will be manufactured with ultra-high performance concrete (UHPC) and installed with field cast UHPC joints which fully develop the joint reinforcement for bridge deck continuity. The demonstration bridge is 33’2” wide by 60’ long, consisting of 14 waffle slabs. A specific instrumentation plan will be developed to evaluate the structural performance of the bridge using strain, deflection, and acceleration sensors.
Fatigue, load and skid resistance tests conducted by Iowa State University exceeded expectations. The demonstration panels have been cast, cured, and are ready to be shipped. Construction of the demonstration bridge is scheduled for the spring of 2011.
Completed in November 2011, the structural performance of the bridge is being monitored by Wapello County, Iowa.
Coreslab Structures (Omaha), Inc.
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