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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.

Shrinkage in concrete stems from the evaporation of water from the mixture as it cures. Contractors mix concrete with the proper amount of water to account for a set level of shrinkage. When the process happens unevenly between the top and lower layers of concrete, shrinkage cracks are bound to form.

Yes, it's best to use a carbide-tipped masonry bit when drilling into concrete. These bits are harder and more durable than standard bits, so they're designed for drilling into tough surfaces like concrete. A different bit is likely to break and pose a safety hazard so you'll definitely want to stick with one that's specially designed for concrete. 

You will know concrete is fully cured after 28 days when the new concrete reaches its maximum strength. Follow the cure time information on the manufacturer’s label or ask your concrete pro about when your concrete is fully cured. You can drive your concrete once it’s partially cured, usually around seven days after it’s poured. After one week, the concrete is strong enough to hold up to regular-size vehicles.