Set time, walk-on time, drive-on time and full cure — what each stage actually means and how Brisbane weather plays into it.
Concrete doesn't dry — it cures. The difference matters, because curing is a chemical reaction between cement and water that keeps going long after the slab feels hard. Here's what each stage means in plain English, and what we usually tell Brisbane clients to expect.
Set time — a few hours
Within a few hours of the pour, the concrete is firm enough that you can no longer push a finger into it. The crew uses this window to broom, edge or tool joints. Stay off it during this stage — a footprint at the wrong moment is a permanent footprint.
Walk-on — around 24 to 48 hours
Most domestic slabs are safe to walk on the next day in normal Brisbane conditions. Cool, damp weather slows that down; hot, dry weather speeds the surface up but doesn't actually mean the concrete is stronger underneath.
Drive-on — around 7 days
A residential driveway is generally rated for light vehicle use after about seven days, and full loads after about 28. Driving on a slab too early is the single most common cause of early surface damage and edge spalling.
Full cure — about 28 days
Concrete reaches its design strength at roughly 28 days. It keeps gaining strength slowly for months after that, but 28 days is the standard reference point used in engineering and quoting.
Brisbane weather and curing
Heat, wind and humidity all affect how a slab cures. In a Brisbane summer we'll often keep a fresh pour damp or cover it to slow surface evaporation — that's what stops surface crazing and gives the slab its long-term strength.
"If it looks dry, it isn't done. Curing keeps happening for weeks after the truck leaves."
