Why does a cement mixer's drum keep spinning all the way to the site? Is it so the concrete doesn't set?

How to say “Why does a cement mixer's drum keep spinning all the way to the site? Is it so the concrete doesn't set?” in Portuguese

In Portuguese

Por que o tambor do caminhão betoneira fica girando o caminho inteiro até a obra? É pro concreto não endurecer?

Why does a cement mixer's drum keep spinning all the way to the site? Is it so the concrete doesn't set? in other languages