Inorganic Protective Coatings and Fiber Reinforced Polymers: Route 47 Wildwood Drawbridge Bridge House Rehabs


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CAIT project no.: 215 RU8972

Fiscal Year: 2007/2008

Status: Final

Rutgers-CAIT Author(s): P.N. Balaguru

External Author(s): Robert Sasor

Sponsor(s): NJDOT, FHWA-USDOT

Summary:

The primary scope and objective of this project was to demonstrate the use of fiber reinforced polymers for repair and rehabilitation of transportation structures located near the ocean. The structures selected were two bridge houses (towers) that are used to facilitate ship movement at the Route 47 Wildwood drawbridge. In the North Tower, the degradation of concrete occurred due to salt ingress in concrete walls. The salt water source and deterioration was more acute around window openings. In the South Tower, the water is entering near the roof and around window openings. In this tower an addition was constructed to house the bridge operating personnel, and detailing on the
four corners seems to be the source of the water entry.

The primary objective was the repair and rehabilitation of these structures. The work consisted of identifying and stopping the water ingress, and applying an inorganic coating on the inside walls. This coating protects the interior concrete surface and reduces water penetration, resulting in lower humidity inside the buildings. The permeability of the coating material is much less than the permeability of concrete, but it allows the release of vapor pressure build-up. Therefore, the coating does not delaminate from the parent surface. Fiber reinforced polymers (FRP) with highly extendable polymers were used to seal the joints between the concrete, timber beams, and roof connections to the timber beams. Other repairs to improve the aesthetics of the buildings were also made.