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A 4-inch-thick concrete slab can support around 4,000 pounds per square foot if a contractor reinforces the slab with rebar, while that same slab without reinforcements will support closer to 1,000 pounds. For the purposes of a patio, 4 inches in thickness without reinforcement should suffice unless you’re installing heavy kitchen equipment or a hot tub on it. In those cases, reinforcing your slab and sticking with 4 inches of thickness should provide plenty of strength.

Whether metal fence posts need concrete depends on the environment and the ground they're placed on. For thick earth and areas without significant weather or high wind, you can get by without concrete, but in areas with weak dirt and strong seasonal weather, it's a good idea to install a concrete base on each individual post. This increases the cost but not as much as replacing or reinstalling the fence would.

Concrete can take up to 28 days to completely harden, depending on the type and its water content. But it dries enough for foot traffic in 24 to 48 hours. If you're curious about how long it takes concrete to dry entirely, the answer is more complex, so always check with the specific mixture instructions before adding heavy machinery or driving on new concrete.

Concrete slump can be affected by the amount of water in the mix, the size of the aggregate components, the mix’s temperature, how long the concrete is mixed, and more. Mixing concrete with the correct slump depends on almost every component of the concrete mix being correctly balanced and is critical to ensure the concrete performs as expected.