Toronto

Gardiner's integrity to be tested

City crews will be on the Gardiner Expressway testing its integrity one day after a 4.5-kilogram concrete chunk fell onto Lake Shore Boulevard.
The chunk of concrete fell from this portion of the Gardiner's underbelly. (Dwight Friesen/CBC)

City crews will be on the Gardiner Expressway testing its integrity one day after a 4.5-kilogram concrete chunk fell onto Lake Shore Boulevard.

No one was hurt when the concrete fell onto a guardrail on Lake Shore east of Bathurst Street near Dan Leckie Way Monday afternoon.

Crews on Tuesday will perform a procedure called hammer-sounding on the Gardiner.

The entire Gardiner Expressway will eventually have to be replaced, says the city's acting manager of structures and expressways. ((Dwight Friesen/CBC))

"What you do is you take a hammer and you tap the concrete. And depending on the sound you hear, [that] will tell you the condition," said Mike Laidlaw, the acting manager of structures and expressways for the City of Toronto.

A ping means everything's fine, he said. A thud signals pieces are loose. Laidlaw said the expressway is considered structurally sound — so far it's just the thin, outer layer that has been chipping off.

But long-term, the city will have to replace the whole highway, he said.

In the meantime, the city does regular maintenance to try to keep these incidents from happening.

"Generally once a year our crews will go in and actually chip off any loose concrete that they discover.  Plus many inspections over the year," he said.

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