– How does leftover cement in cement trucks not harden and slowly accumulate in the mixer, essentially clogging it?

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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

41 Answers

Anonymous 0 Comments

the inside of the drum is washed in some fashion (pressure, acid bath, chemical, etc) to prevent a big amount of cement hardening. there will always be a little bit of cement left over that will harden and accumulate over time. when it gets to the point where there’s too much cement, someone goes into the mixer with a jackhammer or chisel and breaks up the cement.

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