Bronx, NY
Unionport Bridge
Scope/Solutions
During construction of an approach span to a new bascule bridge, New York City Department of Transportation questioned the finishing procedures and long-term durability of the concrete bridge deck. Working for the construction team, SGH evaluated the concrete finish and materials to determine if the in-place materials satisfied the project specification requirements.
SGH evaluated the concrete and developed recommendations to enhance the expected durability of the concrete. Highlights of our work include:
- Reviewing the New York City Department of Transportation specifications for high‑performance concrete, which was required for the new deck
- Using ground penetrating radar to identify locations where core sampling would not impact the embedded reinforcing steel
- Measuring surface crack widths and depths at extracted core samples
- Performing testing in our laboratory to evaluate the concrete’s chloride ion permeability per ASTM C1202
- Recommending the contractor apply a methyl methacrylate sealer to the approach span to reduce permeability
- Collaborating with the construction team to coordinate the bridge deck tining with the sealer installation
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Project Summary
2024
Completion Date
Solutions
Evaluation
Services
Structures | Applied Science & Research
Markets
Infrastructure & Transportation
Client(s)
Unionport Constructors, JV
Specialized Capabilities
Repair & Strengthening | Materials Science
Key team members
Nathaniel Smith
Managing Principal, Structural Engineering, New York
Additional Projects
Northeast
MWRA Deer Island Wastewater Treatment Plant, Egg-Shaped Digesters
Buchart-Horn, the Electric Boat Division (EBDiv) of General Dynamics, and Perini retained SGH to develop the seismic design for egg-shaped digester tanks and their supporting concrete structures.
Northeast
Providence Place Mall Parking Garages
The garages exhibited chronic, premature cracking and spalling of the concrete around precast double-tee flange-to-flange connections as well as other common parking structure deterioration and distress. SGH assessed the condition of the garages and designed remedial work.