Florida DOT Procedures for Ensuring Durability of Segmental Bridges

Abstract

As noted in the “Durability Survey of Segmental Concrete Bridges”, third Edition published September 2007, the state of Florida has built and cataloged over 76 concrete segmental bridges since 1981. As one of the first states to fully embrace this technology Florida has also experienced several durability issues related to inadequate design detail, poor construction practices, and insufficient material specifications. Despite these issues all concrete segmental bridges in the state of Florida have an average superstructure rating of 7.4 which correlates between very good condition (8) to good condition (7). Florida first response was through design bulletins and DCE memorandums to address the immediate needs. This process included inspection of all existing structures for problems followed by implementing design changes that include fundamental change to design philosophy as well as improvements to the design and construction details for new structures. This effort was not limited to design only but also included the training of Engineers and technicians implementing grouting certifications, post-tensioning certification and the implementation of new material standards for post-tensioning systems and ducts. This effort led the State of Florida to take a very aggressive five part strategy to improve the durability of these structures.