AccelBridge offers considerable advantages over conventional full-depth precast deck systems and can provide substantial cost savings, while enhancing overall deck durability, when compared with systems using ultra-high performance concrete (UHPC) transverse joints.
What AccelBridge Does
Current precast deck systems suffer from the construction complexity and durability issues related to internal post-tensioning in the deck panels. The AccelBridge systems simplify the construction and reduce material use by eliminating the internal deck post-tensioning, while maintaining deck compression for durability. The deck compression is either provided by post-tensioning in the supporting girders or tension in the girders themselves.
AccelBridge is fast, low-cost, and durabile: making it a prime candidate for your Value Engineering Proposals and Alternative Technical Concepts.
In addition to providing compression to the deck, AccelBridge's prestressing also offsets service loads on the supporting girders. This results in a substantial reduction in girder material required, and can result in the elimination of 33% of the girder lines required.
- Simplifies construction; no special skill sets required.
- Works with standard DOT girders.
- Erects quickly and minimizes field labor.
- Moves post-tensioning away from corrosive zones.
- Reduces cost and materials.
AccelBridge systems supply the most durable deck system currently available by providing zero-tension deck without any corrodible materials across the deck joint. Typical �trouble-spots� such as at duct couplers and cast-in-place panel joints are eliminated.
AccelBridge works perfectly with match cast epoxy joints. Average 7 minutes per panel for installation is achieved in actual project construction. It eliminates the waiting time to cure CIP joint as other deck systems. AccelRP can allow for deck replacement with night time shutdowns only.
AccelBridge is practical -- it is rooted in an innovative construction sequence using proven materials and elements. It doesn't rely on complex equipment or high cost materials. Project experience proved that it can be successfully executed by contractor with no previous experience in full depth precast deck.
AccelBridge was developed with constructability at the forefront. No duct alignment, PT installation, coupling or grouting for the deck system are required to provide prestress across the deck joints. This equals less field labor, faster erection and less risk.
AccelBridge can be applied to most of girder type bridges, including single and multiple span layouts, steel and concrete girders and I and U-beam shapes, new construction or deck replacement of existing girders.
significantly cheaper than other deck system. Saving girder material as well.
Comparison with current practice
The use of full-depth precast deck panels is the most prevalent Accelerated Bridge Construction technique in the US today. The key to deck performance is how to join deck panels reliably. Two current joining methods: Deck with internal longitudinal PT, or UltraHigh Performance Concrete (UHPC) joint.
Post-tensioned, full-depth precast deck systems have shown great promise in delivering a durable ABC solution. However, the high dependency on workmanship at joints, the relatively high cost of current systems, and concerns over both the durability of the post-tensioning systems themselves and the joints between panels have limited their widespread implementation.
UHPC can develop a secure CIP joint without longitudinal post-tensioning. However, UHPC comes with a premium price tag, and it requires intricate formworks and demanding workmanship in material preparation.
AccelBridge eliminates one of the initial impetus for UHPC by removing the internal post-tensioning durability concerns from the equation. Further, AccelBridge's prestress can provide zero-tension for the entire deck, whereas UHPC's advantages are limited to the joints - especially for continuous spans, AccelBridge offers a significant durability enhancement at a lower cost and simpler construction.