The Grist Mill Bridge, a 75-ft single span bridge in Hampden, Maine, is the first in the nation to use composite tub girders with no concrete reinforcement in the superstructure.
Facing a multi-billion-dollar highway maintenance funding gap, the agency will consider public-private partnerships to address major bridge reconstruction and rehabilitation projects.
The nearly 85-year-old vertical lift bridge is ready for decades more of service thanks to a comprehensive rehabilitation that included electrical and mechanical system upgrades, installation of a new standby generator, and enhancements to provide a safer environment for maintenance personnel.
The Precast/Prestressed Concrete Institute has recently commissioned the largest Ultra High-Performance Concrete implementation project in which six major precast concrete companies are collaborating to develop their own ultra mixture proportions and to implement the technology.