Title says it all; I’m sure a thin layer of cement will be left over after they poor it all, and I would imagine that thin layer would harden and then the next time they use the mixer another thin layer would be leftover and so on and so forth. After a while I would imagine it would accumulate to the point where it renders the mixer unusable.
Why is this not the case?
In: Engineering
one I can actually help with
concrete trucks will wash out after pouring ( God help you if you use all of a trucks water, drivers are miserable) This will help wet down remaining concrete in the truck. Here’s the thing, once concrete hits the air the process of hydration occurs rapidly ( less rapidly in the drum of the truck) unless the concrete has been in there for a long time ( hours) then the stones that rub together as the drum turns create friction and create a ” hot load”
Whatever yardage they have left over is poured into 1 yard blocks that are floated off and sold as retaining walls ( you often see them separating materials at gravel pits) under that amount is poured off into a pile at the back of the plant and sometimes they will get it trucked out ( I’ve seen concrete mountains)
That being said there always remains some residue and many drivers will spend days in the winter jackhammering drums ( and more importantly, the fins of the drum )clean
You will also see 1 foot by 4 inch chunks sometimes in a mix as they break off the fins during the mixing process
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