The rotating part of a cement truck (what the guys call a "mixer") can't be stopped for long while it still contains concrete, much less left stopped overnight, or the concrete will harden.
Also, humans float better in concrete than in water, because concrete is much denser. The stuff shown being poured is not concrete of course, it's much more liquid, like muddy water.
Also, humans float better in concrete than in water, because concrete is much denser. The stuff shown being poured is not concrete of course, it's much more liquid, like muddy water.