Implementation of Highly Reactive Pozzolans in the Key Royale Bridge Replacement

The Florida Department of Transportation (FDOT) recently completed construction on a small concrete bridge constructed with precast, pretensioned piles located in a coastal environment. Six different concrete mixtures were used to construct the piling. They contained fly ash, ultra-fine fly ash, ground granulated blast furnace slag, metakaolin, and silica fume. The sixth mixture was a Portland cement only control with no supplementary cementitious materials used. Funding was provided for this work from the Federal Highway Administration Innovative Bridge Research and Construction Program, which helps state, county and local bridge owners incorporate innovative materials and materials technologies in their bridge projects. The focus of the project is to investigate the long-term durability of the piles constructed with these new materials when in a marine environment. This paper covers the design, construction and early monitoring of the piles.