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 French

In French

Pourquoi les camions toupies font tout le trajet jusqu'au chantier avec la cuve qui tourne ? C'est pour que le béton prenne pas ?

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