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Yes, you can pour a concrete slab on dirt, but only if you follow specific requirements. A wooden frame is a must, and the soil layer used for the base must be wet enough, thick enough, and compact enough to support the weight of the concrete slab. Consult with a concrete contractor to ensure you have the base you need.

It’s best to avoid rain on freshly poured concrete for 48 to 72 hours for the best results, but you’ll see minimal losses of strength as long as your concrete remains dry for five hours after pouring. You can either wait for dry conditions to pour your concrete or cover the area with a tarp to help keep it dry.

Sidewalks are concrete, not cement. Cement is merely an ingredient of concrete. To pour a sidewalk, driveway, or patio, you need to form the right mixture of concrete using cement, aggregates, and water. Pouring concrete requires special tools such as a concrete mixer, compactor, screeds, and floats. Unless you're pouring a small area, it's best to hire a concrete pro for a sidewalk or driveway project.

Poured concrete should be set and hard to the touch within 24 to 48 hours, although it depends on the humidity in the air, the thickness of the concrete, and the type of concrete. It’s best to leave concrete to set for three days before exposing to foot traffic or stress. Concrete takes between 20 and 30 days to cure and reach its peak strength, so for foundations and retaining walls, plan to wait about a month before placing any load on your concrete.