the uncompleted Oroville Dam main spillway next week.
Engineers, that work they did a couple of years ago, how long does it take that much cement to set up / harden?
They need bring dump truck loads of viagra, that will firm it up.
Concrete reaches a majority of its final strength within 2 days of the initial pour. (Nearly all of its strength within two weeks of the initial pour. )
It does continue to react for many years (producing heat that must be removed from the concrete in massive structures like the Hoover Dam), but thin items like this spillway cool easily by natural loss to the air.
#4. You are about to find out the answer to your question.
SWIM for your life!
They only did half of the work two years ago and most of the rest last Summer.