Toronto Forma | 308m | 84s | Great Gulf | Gehry Partners

Taken 24 November.

IMG_5329.jpeg
 
That must be some fast-curing concrete!

Typically, its allowed to cure a bit longer than that:

 
That must be some fast-curing concrete!

Typically, its allowed to cure a bit longer than that:

Modern mix designs allow for early high strength, sometimes reaching design strength within 24 hours. Typically concrete is tested at 28 days.

The rationale here was probably that it's designed for a rather large crane load (full building height), so with high early strength concrete they could be up and running with minimal loads rather quickly.
 

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