Pour enough dry concrete mix into a 5-gallon bucket to repair cracks and patch damaged areas. If the area to be repaired is not large or deep, a sand mix or a concrete resurfacer that does not contain gravel can be used. A standard concrete mix containing gravel works best for patching large or deep areas. Hairline surface cracks, sometimes called "crazing", are an indication that the surface of the concrete dried too quickly when it was poured.
Although unsightly, these cracks in a concrete roadway do not indicate underlying structural problems. As long as the rest of your driveway is in good condition (no lifting, sinking or crumbling), you can replace these small cracks with a smooth concrete surface by applying a high-quality resurfacing product, such as Quikrete's Concrete Resurfacer. This cement-based product contains polymer modifiers and additives that are designed to form a durable and permanent bond with the existing concrete. Repairing a cracked concrete driveway also improves the curb appeal of your home, especially if you are selling.
A cracked driveway is unsightly to potential buyers. Cracks can usually be filled and repaired if the rest of the driveway is in good condition and was installed correctly in the first place. Epoxy-based materials are available, but are probably best left for small jobs. Mixing epoxy and getting it into 50 feet of narrow width cracks could be an exercise in futility.
For one or two short sections of cracks, epoxy provides a good long-term solution, although the appearance may not be the best. Start by using a pressure washer to remove any mould and dirt. After wetting the slab, a special masonry cleaning solution is added to the pressure washer tank and sprayed on the surface. Once the cleaner has been applied, a high-pressure nozzle is connected to the washer and the surface is thoroughly cleaned.
Be sure to clean the cracks as well, removing any dirt or loose concrete so that the patching material will adhere to the concrete. As long as your driveway is structurally sound, there are ways to repair minor and even major defects without having to tear out and replace it completely. As the concrete has already moved and created the cracks it is unlikely to move any further unless there is another root cause. I want to do the repairs myself if possible (due to the cost), but I want to make sure the solution will last for several years.
Other reasons for cracking include pouring concrete on a frozen spot or the absence of control joints. When the stain started to flake off on the long, winding concrete driveway of this house, a decorative overlay with a circular tree motif gave it a complete makeover. Sealing can prevent major problems in the future, and the non-sagging consistency and matt grey colour of the advanced polymer concrete crack sealant evens out the surface and has a texture that blends in with the existing driveway, disguising the fact that there was once a crack. This could indicate an underlying structural problem, especially if the road surface is higher on one side of the crack than the other.
The bottom line is that the concrete should not crack nearly as much as the cracks that originally appeared, but a hairline crack may appear. I see a crack down the centre of my garage floor that shows a water line and another wet line across my garage floor (that in concrete). We know how much you love your driveway and you may have spent your hard-earned money on a concrete resurfacing solution to make it look fantastic, only to discover that it has developed cracks. However, no one, including us, will guarantee that the resurfacing will not crack, as it may be on a substrate that is moving beyond the tolerances of the flexible concrete resurfacing.
For cracks less than a quarter of an inch, specialists use concrete seals or a liquid-based concrete crack filler.