Tips for repairing a concrete driveway include filling cracks up to 1/2-inches wide with concrete repair caulk and using a polymer-based concrete resurfacer to provide a new, uniform concrete surface. Use concrete patch for larger cracks or missing chunks of concrete. Protect the expansion joints when applying the resurfacing materials by applying duct tape prior to applying the material and removing it before the surface dries.
Cracks in concrete provide space for water to collect. In cold weather, the water freezes and expands to cause more damage to the surface. When cracks begin they are often small, but the freeze and thaw cycle continues to enlarge them. If you are resurfacing the concrete, mix a paste of the resurfacing material and press it into cracks up to 1/8 inch wide.
Installing the polymer-based material requires spreading it in a thin, 1/16 inch layer, using a push broom, trowel or squeegee. Use a push broom to create a textured, non-slip surface. When applying the mixture, you must spread and finish it within 1/2 hour of mixing; enlist the assistance of another person to mix more material while you are spreading the previous batch. The new surface is safe for pedestrian traffic after two hours and for parking vehicles after six hours.