Design and Construction of UHPC Bridge Deck Overlays

This chapter delves into the critical need for innovative bridge rehabilitation methods due to the deteriorating state of many bridges in the United States. It highlights the use of ultra-high-performance concrete (UHPC) as a superior material for bridge deck overlays, offering enhanced strength, durability, and longevity. The text provides a historical overview of UHPC overlay installations, from the first projects in Switzerland to recent large-scale implementations in the US. It outlines the key factors in bridge selection for UHPC overlays, emphasizing the importance of structural condition, cost, and long-term performance. The chapter also details the design process, including flexural analysis and recommended design approaches, ensuring that readers understand the technical aspects of UHPC overlay applications. Additionally, it covers construction considerations such as surface preparation, mixing, placement, curing, and finishing, providing practical insights into the successful implementation of UHPC overlays. The conclusion underscores the benefits of UHPC in extending the service life of bridge decks and offers guidelines for managing risks during construction.