– 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

I had a mate that used to own his concrete truck, he would hose the drum between jobs, after discharging at a job site he used the onboard water to spray the inside of the drum and keep the drum rotating until he was back at the plant to reload, there he washed out the drum and then reloaded.
His truck broke down one time while he had half a load in the drum, it set hard before he could get it working and cleaned, he spent almost two days in the drum with a jack hammer cleaning it out.

The alternative was a new drum which was an exorbitant price so he elected to clean it.

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