The garage investigation revealed that a significant structural error in the design/ construction occurred. A substantial amount of the negative bending reinforcing steel was not extended sufficiently past the column supports. The final repair system selected was to shore the floor, remove the concrete overlay, inject the crack, prepare the surface, apply carbon FRP on the top side, and protect with an extra layer of epoxy resin urethane traffic-bearing membrane. The use of Carbon FRP on this project is perhaps one of the most extensive top-side FRP strengthening applications in the U.S. The restoration included:
- Removal/replacement of the concrete ramp overlay with a carbon fiber strengthening system
- Repair of deteriorated concrete on the structured slab surface and along construction joints
- Waterproofing of existing construction joints
- Waterproofing of areas strengthened by carbon fiber reinforcement
- Recoat existing waterproofing on the exposed levels
- In 2013, WGI conducted an updated conditions assessment of the garage.
Project Highlights
- Carbon FRP Strengthening
- Waterproofing
- Recoating
- Phasing
- Won the International Concrete Repair Institute (ICRI) 2008 Award of Excellence
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