A new concrete driveway looks finished within hours. It is not. Concrete does not “dry” so much as cure, a chemical reaction between cement and water that continues for weeks, and the strength of your driveway on day two is a fraction of what it will be at day 28. The waiting times below are the widely accepted guidance for residential concrete in Australia.
The typical waiting times
- Foot traffic: about 24 to 48 hours
- Cars and 4WDs: about 7 days
- Caravans, boats and trucks: about 28 days
These are rules of thumb rather than exact science, because curing speed depends on the concrete mix, the slab thickness, and above all the weather. Your concreter’s advice for your specific pour beats any general guidance, so if you are told to wait longer, wait longer.
Why concrete needs the time
Concrete gains strength on a curve that is steep at the start and flattens over the first month. As a general pattern, a standard residential mix reaches only around half of its design strength in the first few days, and roughly three quarters within the first week. That first week is why the seven day guidance for cars exists: a passenger car concentrates well over a tonne through four small tyre patches, and a slab at partial strength can crack or scuff under that load in a way that never shows up once fully cured.
The 28 day figure is not folklore either. It is the standard age at which concrete strength is measured across the industry, because that is roughly where the strength curve levels out.
Melbourne weather changes the picture
Curing needs moisture and moderate temperature, which makes Melbourne’s swings relevant:
- Winter pours cure slowly. Cold weather stretches the strength curve, so the safe waiting times sit at the longer end. A slab poured in July deserves a more patient owner than one poured in February.
- Summer pours face the opposite problem. Heat and north wind can dry the surface faster than the concrete beneath it cures, which risks surface cracking. This is why pours are often scheduled early in the morning in summer and why curing measures matter more in hot weather.
- Rain shortly after a pour is mostly a surface finish concern in the first hours. Once the surface has set, ordinary rain is not a problem for curing, and can even help it.
What to avoid in the first month
Beyond keeping vehicles off early, a few habits protect a young driveway:
- Avoid the edges. Slab edges and corners are the weakest points early on. Turning a car wheel tightly at the driveway edge in week one is a common way to chip it.
- No skips, trailers under load, or removal trucks. One heavy visitor in week two can do what a year of normal parking never would. If you are building or renovating, tell your trades the driveway is new.
- Skip the pressure washer and harsh chemicals. The surface is still maturing. A hose is fine.
- Do not paint or seal it yourself early. Coatings applied before the moisture has left the slab tend to fail. Sealing has its place, particularly for exposed aggregate, but timing matters, so follow the advice given for your pour.
The patience pays off
A concrete driveway is one of the longest lived surfaces you can put on a property, with decades of service ahead of it. Measured against that lifespan, a week of parking on the street is a small price. The costly mistake is treating day two concrete like day thirty concrete.
If you are weighing up a new driveway, the Melbourne cost guide shows current per square metre prices, and every job starts with a free site measure.
Planning a driveway? See current Melbourne prices or book a free site measure.