How long before I can walk or drive on new concrete?

The American Cement Association says most of the hydration and strength gain happens within the first month of concrete's life.

It also says the longer concrete is kept moist, the stronger and more durable it becomes.

The American Concrete Institute says concrete can usually continue to gain strength for a long period, as long as temperature and moisture conditions are suitable.

The American Concrete Institute defines curing as action taken to maintain moisture and temperature conditions in freshly placed concrete so it can develop its intended properties.

Curing methods include keeping the surface moist, covering it with moisture-retaining fabric, or sealing it with plastic sheeting or a curing compound.

ACI 305R-20 defines hot weather as conditions that tend to impair concrete by speeding up moisture loss and cement hydration. These conditions are high air temperature, high concrete temperature, low humidity and high wind.

The guide says the precautions needed on a windy, sunny day are stricter than on a calm, humid day, even at the same air temperature.

Ask your contractor how they protect your slab while it cures.