It is true that the concrete is strong, but even the concrete cracks and breaks. Eventually, nature manages and leaves its tracks.

The presence of extreme temperature and humidity leaves damage to concrete, floors, corridors and structures. Fortunately, simple repairs can be made to the concrete. The job requires some tools, no special skills are needed; but it requires a strong spine. The concrete is heavy and mixing it is difficult work. Still, it is a comforting job if you are willing to do so.

Concrete repair cracks

The technique for repairing cracks in concrete will depend on the size of the crack.

Fine cracks

Remove all types of particles from the crack and the surrounding area with a wire brush and broom.

Fine cracks can be filled with a masonry mass that comes in a cartridge designed to be used in a caulking gun. Or you can fill the cracks with a patch of a vinyl concrete compound that is applied and spread with a flexible trowel. Patching a vinyl concrete compound does not require the use of a bonding agent.

Concrete repair: wide cracks

Use a small hammer and chisel to cut below the edges of the cracks. The cut under the cracks makes it wider at the base than at the surface, and the mechanical method of “priming” the patch is applied to make the repair safer and more permanent.

Clean the area in and around the crack with a wire brush and broom. Wash the area with a water jet.

Mix the vinyl adhesive compound as directed by the manufacturer and pour the compound into the cracks. Cap the mixture to remove any air bubbles. If you use a mortar patch instead of a vinyl compound for the patch, mix it with a bonding agent instead of water or cover the edges of the surface to be repaired with a bonding agent.

Smooth the mixture with a mason’s spatula.

When the adhesive is ready (see instructions for the adhesive compound you are using), smooth or brush the surface to match the surrounding area.

Wear gloves, safety glasses, long sleeves and long pants when drilling, hammering or chiseling concrete.

Concrete repair cracks walkway and stair ledge

concrete stair repair

If the edge of a walkway or step has been damaged, you can repair it to look like it was before. The process is similar to restoring a crack, but requires the use of a mold.

  • Step 1. Remove any damaged or disintegrated concrete. Use a small hammer and chisel to cut the edges of the damaged areas.
  • Step 2. Clean the area in and around the damaged area with a wire brush or broom. Then clean the area with a jet of water.
  • step 3. Use a piece of wood as a template and place it against the part of the area you want to repair. Use bricks or other heavy objects to keep it in place. The top of the mold must be level with the desired edge height. The template will serve as a guide to smooth the patch.
  • Step 4. Mix the vinyl adhesive compound as directed by the manufacturer and pour the compound into the area to be repaired. Cap the mixture to remove any air bubbles. If you use a mortar patch instead of a vinyl compound for the patch, mix it with a bonding agent instead of water or cover the edges of the surface to be repaired with a bonding agent.
  • Step 5. Smooth the mixture with the mason’s spatula, guiding the top edge of the pan.
  • Step 6. When the patch is ready (see instructions in the manual for the patch compound you are using), remove the mold and smooth or brush the surface to match the surrounding concrete.
  • Step 7. Protect the patch area until it has time to dry, according to the manufacturer’s instructions.

Corner reconstruction

fix Concrete repair cracks 

Concrete repair cracks 

Unless the area to be repaired is very small, rebuilding a damaged corner also requires a mold.

  • Step 1. Remove any damaged or loose concrete in the area to be repaired.
  • Step 2. Clean the area with a wire brush or broom. Wash the area with a water jet.
  • step 3. Use two pieces of wood as a mold and first pin them together to form a corner, then place them in the corner you want to fix. Use bricks and wooden supports to hold the mold in place. The top of the mold should be level with the height of the finished corner. The template will serve as a guide to smooth the patch.
  • Step 4. Mix the vinyl adhesive compound as directed by the manufacturer and pour the compound into the area to be repaired. Cap the mixture to remove any air bubbles. If you use a mortar patch instead of a vinyl compound for the patch, mix it with a bonding agent instead of water or cover the edges of the surface to be repaired with a bonding agent.
  • Step 5. Smooth the mixture with the mason’s spatula, guiding the top edge of the pan.
  • Step 6. When the patch is ready (see instructions in the manual for the patch compound you are using), remove the mold and smooth or brush the surface to match the surrounding concrete.
  • Step 7. Protect the adhesive area until you have time to heal according to the manufacturer’s instructions.

Concrete block and path repair

repair concrete road

Concrete repair cracks 

Strongly damaged concrete blocks or sidewalks are best repaired by removing and replacing the damaged area. This is a more complicated job than those mentioned earlier in this article, but only because it requires more preparation and mixing of large amounts of concrete.

  • Step 1. Using a small hammer, break the damaged area of ​​the concrete into pieces.
  • Step 2. Remove the larger pieces of concrete from the area and distribute the smaller pieces of stone to create a firm bed on which you can place the mixture.
  • step 3. Clean the edges of the remaining blocks with a broom.
  • Step 4. Place wooden molds (2 × 4 or 2 × 6) around the edges of the repair area. The top of the mold must be level with the desired height of the finished block. The molds will serve as a guide to smooth the new area of ​​the block.
  • Step 5. Mix the concrete according to the manufacturer’s instructions.
  • Step 6. Moisten the area for concrete repair.
  • Step 7. Fill the area between the molds with the concrete mixture. Start from a corner towards the center. Then start in the opposite corner by going to the center again. Fill until the concrete reaches the top of the molds.
  • Step 8. Use a plate that is wider than the repaired area and slide the plate over the molds to smooth the surface of the repaired area. This is called pairing. Remove any excess concrete that accumulates in front of the board.
  • Step 9. Cover the sides of the molds to level the concrete.
  • Step 10. Smooth the concrete surface with a trowel or a long trowel, moving it in large semicircles from side to side. Stop when the water rises to the surface.
  • Step 11. After the water has evaporated, smooth the surface with a mason’s spatula.
  • Step 12. Wait for the concrete to harden, then smooth the surface or brush it so that it looks the same as the existing concrete or walkway. Insert a mason trowel between the concrete and the mold and slide it along the inner edge of the mold.
  • Step 13. To match the appearance of the rest of the block or path, you will need to run a beveler along the molds and the new concrete. The hand edger is a special tool that rounds and shapes the edges of the concrete surface that has been cast. A splicer or groover is a tool used to create a joint on the concrete surface, like a crack in the pavement. Use these tools as many times as necessary to achieve the same appearance as the concrete block or walkway you are repairing.
  • Step 14. Protect the patch area until it has time to dry, according to the manufacturer’s instructions. It is best for the concrete to dry slowly. For this reason, the manufacturer may recommend that you spray fresh concrete with water and cover it with plastic for at least three to four days.