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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, fiber concrete can crack, and contrary to popular belief, it will crack under similar forces to rebar-reinforced concrete. The difference is in how the crack spreads through the slab. When you exert pressure on a slab, the slab flexes downward, putting tensile forces on the bottom of the slab. In rebar concrete, a crack at the bottom will also quickly appear on the top surface. In fiber concrete, the fibers hold the two sides of that bottom crack together, making it less likely for the crack to form on the top surface.

Minor hairline cracks in your concrete may not look pretty, but they’re often not serious. It’s when concrete cracks are larger—wide enough that you can slide a credit card into it—that you need to worry. If you monitor a crack and can trace its active expansion over time, you’ll definitely want to call in a pro to inspect it and, potentially, repair it. Want to prevent cracks in your garage and driveway concrete in the future? Stay on top of sealing. Here’s how to seal your concrete garage floor and driveway.

Concrete shrinkage cracks are very common and should be expected. Even professionals end up with shrinkage cracks on newly poured concrete slabs. Remember that these cracks are not harmful to the slab's strength, though some homeowners do prefer to fill in the cracks for aesthetics. When installing concrete, you can avoid ample concrete shrinkage cracks by avoiding hot, sunny, or windy days.