Nicholas Dean, P.E., Project Engineer, Bridge Design, Delaware Department of Transportation; and Q&A panel member Craig Stevens, P.E., State Bridge Design Engineer, Bridge Design, DelDOT

Webinar Documents:
ABC Methods for Delaware’s All-Precast Bridge 1-438 - pdf of presentation
DelDOT's UHPC Overlay Spec used for Bridge 1-438 - pdf (Note: DelDOT will update with experience from future projects)
Q&A Session - pdf
News - October 18, 2018 - pdf of presentation

Description:  In the summer of 2017 the Delaware Department of Transportation replaced Bridge 1-438 on Blackbird Station Road over Blackbird Creek with a 50-ft single-span bridge constructed of precast concrete elements. The project, a recipient of an Accelerated Innovation Deployment (AID) Demonstration grant, was completed with a 31-day closure. The precast abutments and precast adjacent box beams were erected, and ultra-high-performance concrete (UHPC) was used in the deck closure joints and overlay. This presentation describes design and construction of the project and illustrates the pros and cons and lessons learned from using ABC techniques for the replacement. The presentation also discusses the collaborative efforts between federal and state agencies in producing specifications and plans.

Presentation Photos/Graphics:

1)  Steel pile driving template

2) Abutment section placement

3) Abutment closure pours

4) Beam placement

5) UHPC shear key and closure pour

6) UHPC overlay pour and final riding surface

7) Completed Bridge 1-438