A SUSTAINED DRIVE

摘要

The use of concrete as a structural material has been important to sustainable infrastructure for many centuries. Over the years concrete bridges have continued to advance through progressive concrete mix designs and bridge technologies. These advances include: 1. High-performance concrete (HPC) with its many valuable benefits such as decreased permeability that impedes chloride intrusion, and improved corrosion inhibitors that provide added protection to reinforcing stee1; 2. bidirectional post-tensiontng in bridge decks to provide a permanent state of compression during service; 3. Integral wearing surfaces for concrete bridge decks that improve long-term service performance; 4. Cable-stay bridge system innovations, such as the cradle invention, and creative protection measures to provide long-term sustainability of the stays; 5. Instrumentation of bridge components in service to monitor performance and provide performance feedback in real time; and 6. Innovations in configuring bridge components to evenly distribute forces between elements that will contribute to improving long-term performance.