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Dry pour concrete cures in the same amount of time as wet pour concrete, so you’re looking at four to six hours for it to harden, 24 to 48 hours before you can remove forms and expose the slab to foot traffic, a week before it can stand up to vehicle traffic, and about a month for it to be fully cured.

Yes, you should always wet concrete before jackhammering to avoid harmful dust from becoming airborne. According to the U.S. Occupational Safety and Health Administration, they recommend a wet-cut method that involves continuous spraying of the concrete where the jackhammer bit hits. Use a jackhammer with a built-in sprayer attachment, or have a work partner spray the area with a garden hose and spray nozzle.

Lally columns do require some kind of footing to ensure they have a strong enough base to provide the support they need to deliver, and, at the very least, they need to attach to the floor below. Some contractors will just use the existing foundation as a footing for temporary Lally columns, while some circumstances demand that the expert install a new footing. You might need a local structural engineer to weigh in on which is best for your project.

The method used to repair cracks in your concrete driveway will depend on the extent of the damage, but the most common method for small cracks is to use a driveway resurfacing compound. This solution is either cementitious or made of polyurethane, and it will seal the crack and make your driveway appear undamaged. 

For more severe cracks, you will likely need to hire a professional driveway repair service. They can use mudjacking, epoxy injections, partial driveway replacements, or a combination of these to fix more serious cracks in your concrete driveway and to prevent recurring issues.