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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When the Virginia Department of Transportation (VDOT) selected the bridge carrying Route 198 (Dutton R o a d ) o v e r H a r p e r C r e e k f o r a superstructure replacement, many challenges had to be resolved. VDOT desired to widen the superstructure on this important rural primary route while minimizing the impact on nearby sensitive brackish-water wetlands. These challenges led the design team to investigate the reuse of the original gravity-style abutments on timber piles. To reuse the substructure, the dead load of the replacement superstructure had to be less than or equal to that of the existing superstructure. Additionally, one lane of traffic was required to remain open during construction, which resulted in a tight working area for the contractor. With all of these issues in mind, the design team concluded that the most efficient solution would be a staged s u p e r s t r u c t u re re p l a c e m e n t u s i n g lightweight concrete for both the prestressed bulb-tee beams and cast-in- place deck. Sheet-pile walls were used to accommodate the minor widening of the approach roadway, minimizing impact on the wetlands. All details and material selections for this bridge met VDOT's goal of reducing long-term maintenance. Project History Existing Bridge The bridge carrying Route 198 (Dutton Road) over Harper Creek is located in Gloucester County, Va., in VDOT's Fredericksburg District. Completed in 1941, it was part of the realignment of the original roadway to improve poor roadway geometry. The bridge structure consisted of one 40-ft simple span for a total length of 42 ft 6 in. (end-of-slab profile ROUTE 198 (DUTTON ROAD) OVER HARPER CREEK / GLOUCESTER COUNTY, VIRGINIA BRIDGE DESIGN ENGINEER: Whitman, Requardt & Associates LLP, Richmond, Va. PRIME CONTRACTOR: Bryant Contracting Inc., Toano, Va. PRECASTER: Atlantic Metrocast Inc., Portsmouth, Va.—a PCI-certified producer SURVEYOR: NXL Construction Services Inc., Richmond, Va. by Jeremy Schlussel, Caroline Hemp, and Timothy Beavers, Whitman, Requardt & Associates LLP ROUTE 198 (DUTTON ROAD) OVER HARPER CREEK STAGED SUPERSTRUCTURE REPLACEMENT USING LIGHTWEIGHT CONCRETE AIDS PROJECT GOALS Aerial view of the new bridge and approach roadway on Route 198 in Gloucester County, Va. Photo: Whitman, Requardt & Associates. 12 | ASPIRE Summer 2017 P R O J E C T

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