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
Worked commercial construction for many years. After pouring trucks would find a spot at the site for the driver to do a thorough rinse of the truck and dump the wet slurry of leftover cement, clean the chute, hose off any that had splashed onto any part of the truck etc… then when back at the plant they can do another clean with chemicals.
I knew the guy that owned the plant. He was a real ass. Drivers would tell us they’d be in trouble if they brought back a dirty truck/didn’t clean off well enough. However they would say they’d also be in trouble if they took too long at the job site and didn’t return in time for the next load. As a result this guy’s trucks were often in pretty shitty shape with dried cement on them.
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