This part of the process was well supervised.
The guy on the left below wearing the hardhat is the remote control operator. He controlled the location of the Putzmeister boom and the flow of the concrete out of the boom that the guy on the right directed. The two other guys above are operating a big vibrating thingy that works the air bubbles out of the concrete.
The crew on the inside of the foundation was hitting the forms with sledgehammers to encourage the concrete to flow into all the nooks and crannies of the forms and fully encase all of the rebar.
The process took about 1 hour per cement mixer, so about 4 hours total including cleanup.
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