Hi,
I've concreted for the first time, mixing my own in a proper mixer, to
lay a new slab alongside a slab that already existed. I used 1 part
cement to 5 parts balast. The new slab has now been curing for 6 days
(with a couple days of intermittent heavy rain and my having to cover
the cement with plastic sheeting) but the new slab is a darker shade,
may be a browny shade, where as the existing slab is lighter and is a
shade of grey.

My questions are - Does all concrete wind up roughly the same shade of
grey? Will my new slab eventually look the same (ish) as the existing
one after curing is complete? How long does it take to fully cure?

Thanks