Concrete Crack Repairs

Concrete Crack & Small Repair

how to repair large concrete cracks While concrete cracks appear to be typical, it is not recommended that they remain ignored.These cracks, typically due to drying shrinkage, thermal movement or other causes usually are minor and result in few problems. But slab cracks are not only an eyesore, but they may hinder the value of the home.

Fortunately, there is an easy way to permanently repair such cracks without the need for major, costly and disruptive repairs. For the repair of concrete floor cracks, certain epoxies and polyurea materials exists, suitable for such slab repairs.

Identify Causes of Concrete Damage

It is important in the concrete resurfacing repair process to identify what has caused the damage in the first place. By looking at the environment and the use of the concrete flooring we are able to help address the root causes of the damage. Concrete can be tailored to meet the needs of your business and withstand the abuse to which concrete floors are subjected.

The repair process often begins with with scarification to remove old floor coatings or shot blasting to remove soft concrete and contamination. These processes leave an even and textured surface that is ready for concrete resurfacing. We are industry leaders in these surface preparation processes and have been for years.

Simply pouring wet concrete into a hole in your driveway, sidewalk, or basement floor won’t make for a lasting repair. You have to prep the edges correctly and use the right materials. Holes 1 inch or deeper require a concrete mix with coarse, crushed-stone aggregate, which bonds well with existing concrete. Shallower holes need a sand mix. Whichever type you use (they’re both available at home centers), follow these steps.

  1. Use a hammer and a cold chisel to level the bottom of the hole and undercut its sides slightly so the patch can’t pop loose. Vacuum, then clean the area with water and a wire brush. Wipe clean.
  2. Brush on a concrete bonding liquid, sold in bottles at home centers.
  3. While the bonding agent is still tacky, mix the concrete with water and scoop some into the hole. Press it into the corners and against the edges with a trowel. Now fill the hole completely, leaving some material mounded on top.
  4. Level the patch with a straight-edged board at least a foot longer than the width of the hole. Move it back and forth in a sawing motion. This will also push down the aggregate and make the final smoothing easier. When the surface loses its wet sheen and feels firm to the touch, smooth it with a magnesium or wood trowel, which won’t interfere with curing. Work the trowel in a fanning motion to blend the edges with the existing concrete. Do this several times as the mix cures. To burnish the surface very smooth, use a steel trowel (shown) on the final few passes. For a texture, pull a damp push broom over the concrete. Wait at least 24 hours before walking on the patch and a week before driving on it.

TOH Tip: The temperature of the existing concrete must remain above 50 degrees for the first 24 to 48 hours after the patch is applied. The cooler the weather, the longer the curing time.