Rehabilitation of the Centre Street Bridge in Calgary - 1999 - 2000 It was decided to rehabilitate the bridge because the reinforcing had rusted and concrete was beginning to spall. The rusting steel had left stains on the concrete, in addition to salt stains from deicing chemicals and water running through the concrete of the bridge. The steel was in such a state that it was deemed better to replace it now. The University of Calgary, the City of Calgary and ISIS Canada are collaborating and have used a glass fibre grid reinforcing in part of the lower deck; to check how well it works instead of steel reinforcing. Glass fibre does not corrode like steel, so the expectation is that the bridge will last longer before further repairs are needed. The University of Calgary will be monitoring the performance of the glass fibre grid.
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