When a reinforced concrete bridge deck is subjected to freeze-thaw cycles and de-icing salts over a number of years, the ensuing deterioration drastically reduces the structure’s service life and results in costly maintenance or early replacement. In such severe environments, high-performance concrete (HPC) is often required because of its superior strength and low permeability. Unfortunately, HPC also has a tendency to crack prematurely if not properly cured.
Concrete pavements are known for their strength, durability, and longevity. In the past, they have also been associated with a high initial price. However, in a number of lifecycle cost studies, concrete pavements prevail due to the significantly lower maintenance and rehabilitation needs.
Annex D of Canadian Standards Association (CSA) A23.3-04, Design of Concrete Structures, introduces a new and comprehensive limit states design (LSD) procedure for determining factored tension and shear resistance of both cast-in-place (CIP) anchors and pre-qualified post-installed mechanical anchors installed in cracked and uncracked concrete.
Montreal’s Hilton Garden Inn—a hotel and residential structure—has 43 floors—37 above-grade and six below-grade parking levels. With 216 hotel rooms and 211 apartments, this $67-million project was designed by local firm, Geiger+Huot Architects.
In the eternal struggle between building cost and quality, studcast systems can be potent tools. The thin-panel system provides benefits of architectural precast concrete, but reduces weight by more than 50 per cent.