How to Repair Concrete
Time Required: Over 1 day
Over time, residential sidewalks can develop a few cracks or crumbles. To keep this damage from spreading too quickly, and to prevent potentially unsafe conditions, you’ll want to repair these problems before they get too big.
This project guide offers steps and instructions on how you can repair those small cracks and crumbles yourself using just a few common masonry tools and a little bit of time.
To anchor a patch, make the crack wider at the bottom than at the top. Place a cold chisel in the crack, angle it slightly outward and tap it with a 3-pound sledge hammer.
Patching mix is made from vinyl, Portland cement and sand. It covers cracks up to 1⁄2 inch wide. Dampen the area around the crack, and then trowel on the mix. Smooth the surface with either a trowel or a small float.
- Pop-outs are small conical shape chunks of concrete that have popped out and left a hole behind.
- Using a cold chisel and a 3-pound sledgehammer, undercut the hole by making the pop-out wider at the bottom than at the top. Clean the hole with a stiff fiber or wire brush.
Smooth the surface with a putty knife or trowel. Anchoring cement expands as it hardens. It is primarily used for anchoring bolts in holes drilled in concrete, but it also works well here. Keep the area moist until the patch cures.