St. Petersburg, FL
Award Category: Durability
Owner: Florida Department of Transportation
Contractor: American Bridge Company
Substructure Engineer: Kisinger Campo & Associates Corp.
Engineer of Record: American Consulting Professionals, LLC
Concrete: Argos USA
Slag Cement: Argos USA
In this project slag cement was used in a variety of applications. Workability and early strength on the decks allowed for spans to remain plastic throughout the whole pour while allowing full loading within 5 days. Aesthetic appeal and early set times were the key to successful placements of the cast-in-place dolphin wall. The footings, columns, and caps all had pours that fell under the category of mass concrete, so temperature control was crucial to maintaining the allowable delta.
All the mix designs contained slag cement, this helped deliver a quality product with favorable cycle times to help keep the project schedule on track.
The design-build project for the Florida Department of Transportation includes replacing the existing two-lane bascule bridge with a two-lane, high-level, fixed bridge with 10 foot shoulders, a sidewalk and shared-use-path for bicyclists and pedestrians. Over the three years of construction, just under 18,000 cubic yards have been placed in total on the project. As part of the design-build proposal, all structural elements were to be at least Class IV 5500 psi to help extend the lifespan of the new bridge. The footers were constructed with a concrete seal slab that allowed for all formwork to be hoisted into position at once. Anti washout concrete was utilized to seal the formwork to the pile and then the footer was placed with micro-silica concrete for longevity in the harsh marine environment. The cast-in-place decorative dolphin wall utilized smaller aggregate to ensure the custom form-liners produced the desired aesthetic appeal while minimizing on finishing efforts. Forta-Ferro fiber reinforced concrete was utilized as an overlay on both the sidewalk and the shared-use-path in Spans 1-8 of the bridge for compliance with ADA standards