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
Concrete driver here. There will always be a little bit of a buildup, you can only slow down the process. We rinse after every load and if possible(only on big construction sites) we add about half our water tank into the drum, let it spin back and forth and let the slurry out. Over here on the other side of the pond we dont go in to the drums to clear the concrete but we take the truck to a specialized company instead, where they will close off the drum, add gas and oxygen and let that explode 2-3 times. That will clear most of the concrete inside the drum, and keep it from looking like someone shot a shotgun at it. Last time we did this with one of our trucks about 1 m3 came out.
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