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 Japanese

In Japanese

ミキサー車(しゃ)のドラムって、なんで現場(げんば)までずっと回(まわ)ってるの？コンクリートが固(かた)まらないように？

Mikisāsha no doramu tte, nande genba made zutto mawatteru no? Konkurīto ga katamaranai yō ni?

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