Concrete Repair Tips
The techniques required to repair concrete depend on the specific location of the crack and how big the crack actually is.
Repairing Wide Concrete Cracks
This normally requires a certain amount of precision and skill. The wide crack should first be undercut with a small hammer and chisel, which widens the crack and creates a keyed surface on which the concrete patch is placed, allowing a more secure, reliable repair to be made.
After creating the wider base, thoroughly clean the crack with a wire brush or a damp cloth to remove any small particles which would stop the adhesive bonding with the surface.
Mix the concrete patching product you are using to repair the crack, following the specific manufacturer’s instructions (these can vary between suppliers). After it is mixed, apply the compound into the crack using a trowel. Tamp the mixture to remove any air pockets between the surface of the concrete and the patching compound.
Finish off the patching compound and smooth with a trowel. Let the patch set, then smooth the surface down to the existing surface.
Then seal the concrete to prevent stains from being absorbed. There are a number of products available to seal concrete, but we recommend a heavy duty polyurethane that is water-based.
Repairing Narrow Concrete Cracks
These are much easier to fix:
Remove any loose particles and dust from the crack with a wire brush. Rinse the affected area with water.
Fill in the crack using masonry crack elastomeric filler. This can be applied with a caulking gun. Alternatively, hairline cracks can be fixed with a vinyl concrete patch product that is applied over the concrete crack and smoothed down with a putty knife.
With these tips you should be able to fix most concrete cracks on your property. For bigger concrete repair work, call your local concrete contractor.