ABSTRACT
The Robert-Bourassa/Charest (RBC) overpass was a highway bridge structure (Quebec, Canada) that was built in 1966 using an alkali-silica reactive limestone aggregate. The bridge was made of a deck (BD) resting on reinforced concrete Y-shaped columns (C), themselves supported by massive foundation blocks (FB). Over the last 3 decades, many signs of distress were observed on the various elements of the structure. This included extensive steel corrosion and concrete delamination/spalling at the level of the deck; map cracking, scaling, disaggregation and pop-outs affecting the massive concrete foundations due to ASR and freeze-thaw (FT) cycles; and concrete spalling and steel corrosion on the columns and foundations exposed to salt-water spray from traffic on the Robert-Bourassa highway (Bérubé et al. 2005a).
