THE CONCRETE BRIDGE MAGAZINE

WINTER 2018

ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.

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Trail to the bridge with the team and learn about the design and construction of the monumental bridge. The bridge designer also created 3-D-printed models of the bridge in snap-together pieces to make hands- on learning tools for student education programs at Brattleboro-area schools. During both design and construction, the design-build team visited several local schools to discuss the construction and engineering behind bridge building. Custom FIGG Bridge Boxes, which contain education tools to inspire and teach children about science and engineering, were part of the project activities. On Saturday, March 4, 2017, more than 800 local residents and visitors took advantage of an opportunity to walk across the new bridge before it opened to traffic. Representatives from VTrans and the design-build team were on hand to answer questions as the public journeyed across the bridge. The bridge was dedicated on September 12, 2017. Durability VTrans required a 100-year design life, but the bridge designers focused on providing a 150-year design life. Concrete segmental bridges as a structure type are inherently durable due to sustainable materials and the use of biaxially post-tensioned concrete. Concrete mixture proportions were designed for low permeability and the addition of calcium nitrite enhanced resistance to chloride penetration. Also, stainless-steel reinforcing bars were used in the bridge deck to enhance the deck life. Incorporation of durability into the initial design will ensure the least possible maintenance and cost over the life of the bridge. Conclusion The design-build team provided creative solutions to the bridge challenges, including the use of balanced-cantilever construction, which eliminated the need for temporary falsework in the West River. Compared with its predecessor, the single bridge provides a smaller overall footprint. With fewer footings and abutments, it required less erosion control and had fewer areas of environmental impact during construction than the original bridge concept during the request-for-proposal phase. The single concrete bridge also provides ease of inspection inside the bridge, requiring less mobilization during future annual inspections. A best-value concrete segmental solution provided a one-of-a-kind gateway to nature in the beautiful state of Vermont. ____________ Garrett Hoffman is the northeast regional director for FIGG in Exton, Pa. Construction of Pier Table 1. Pier 1 soared 70 ft in the air while vehicular traffic was maintained on Route 30 and river remained open for recreational boating. Pedestrians enjoy the West River Trail and provide scale to the grand 60-ft-tall quad-wall piers of the bridge. The piers have a textured concrete surface inspired by the area's native stone. The barrel shape cast into the soffit is colored blue to match the sky. Balanced-cantilever construction allowed work to continue through the harsh Vermont winters. No temporary falsework was needed, which kept crews out of the water and allowed construction to continue on both sides of the river. 24 | ASPIRE Winter 2018

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