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Precast concrete can last from 50 to 100 years or more. Precast concrete may have a longer lifespan than cast-in-place concrete due to the controlled curing conditions and lack of environmental exposure during the curing process. Properly maintaining and regularly inspecting your precast concrete can help extend its life and keep it in good condition for decades. 

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.

The driveway apron is a technical term referring to where a private driveway meets the public street. If there is a sidewalk in front of the house, the driveway apron is typically on the opposite side of the public sidewalk from the driveway itself.

Yes, adding water to concrete will increase its slump, so you should do so with caution. Always measure the slump of the concrete batch before you adjust it, and be sure not to add too much and push the slump too high. Doing so can cause the aggregate to separate, set inconsistently, or shrink.