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New concrete can crack within 12 hours of finishing, as it can be a common occurrence as the concrete dries and cures. Certain weather conditions and temperatures can slow or speed up the cracking. A concrete contractor plans for cracking during the drying process and keeps some of it at bay by installing control joints.

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.

No, cement cannot be used on its own except for rare circumstances, as it's only a binder to form other products, such as concrete or mortar. Follow the manufacturer's instructions to create a concrete or mortar mix. Concrete, for instance, needs cement, water, and aggregates such as sand and gravel. Using the right amount of water and water temperature is essential to ensure you have the right concrete slump and the mix spreads easily and cures well.

When pouring a new concrete slab, you should consider how additional costs will affect your total, including reinforcements, decorative enhancements, finishing, and curing. It's also important to consider local laws regarding the grade, drainage, and permits for installing concrete on your property. Speak with your professional about the ideal thickness for your slab, and also consider whether you’ll need drainage for slab longevity.