How Long Does Concrete Actually Take to Cure?

A ROKA piece leaves the workshop looking and feeling finished within a couple of days of being cast. It isn't fully cured yet — and that's normal, not a shortcut.

What's actually happening while concrete cures?

Cement and water react to form a crystal structure that locks the mix together — that reaction is what "curing" means, not just drying out. It runs fastest in the first day or two, then keeps going, slower and slower, for weeks. A piece can feel rock solid to the touch while that reaction is still well short of finished.

So when can a piece actually be handled or installed?

Once it's self-supporting, which for our GFRC mix is around 18–24 hours — covered in What Is GFRC? — the mould's only job is to hold the shape until then, not to wait for full strength. The concrete goes on gaining strength long after it comes out of the mould, on the bench and after it's installed.

Does that mean a new piece is fragile?

No. By the time a piece is installed it's well past the point that matters for daily use — general practice treats 28 days as the reference point for a concrete mix's full design strength, but most of that strength develops much earlier, with the rest tailing off slowly. It's why we don't rush a piece straight off the bench into hard use, and also why we don't sit on stock for a month before it's ready to go out.