[Lonesome in Massachussets]

I recall in an engineering class they taught us that Hoover Dam was a continuous poor. They had spare trucks filled with mixed concrete in case one broke down there would always be a spare. They poured 24/7/365.

[waterhill]

Poured in ‘flats’.

If the dams had been poured in one shot, it would take several decades for it to cure.

Now, these days, chemical concrete can be poured and cure in days.