How To Fix Cracks in Concrete

Concrete is one of the most popular building materials in construction all around the globe. Concrete has many advantages when compared to other construction materials.

Concrete can be installed for hundreds of years. However, concrete eventually develops small cracks, gaps, holes, and crevices. Make sure to make repairs as soon as possible if your concrete driveway, patio, or path shows age. It is dangerous to continue using such buildings. Further use of these buildings will risk people’s lives and their habitats.

Because what was once a minor problem will now be much more complicated and costly to fix. Although it is possible to fix concrete cracks with the help of a professional, not all concrete cracks can be fixed by anyone.

Crack formation or cracking of a structure can be caused by one or more of the following factors:

  • Plastic shrinkage and temperature.
  • Thermo variations
  • Drying shrinkage
  • Chemical reactions
  • Weathering.
  • Construction overload
  • Poor construction practices include inadequate curing, inadequate water content in concrete mixtures and inadequate support for formwork.

Cracks can indicate structural distress or lack of durability. Cracks can lead to structural problems such as weakening or water leakage through cracks.

Crack development is very serious if not seen and analyzed from a structural perspective. It affects not only the structural aspects but also the interior and exterior aesthetics.

Cracks can cause structural damage in many ways. It is crucial to repair cracks as soon as possible. Many methods can be used to repair cracks, depending on the type of cracks and structure. Many factors can influence the choice of crack repair methods.

If you are interested in why clay develops cracks like concrete after drying then read this informational article about the same

In this article, we will examine how you can fix the cracks in concrete!

How do you repair cracks in concrete?

You can transform concrete surfaces in four easy steps and end all your problems. You can conquer cracks.

Step 1 – Roughen the Edges of the Crack

You can bring new life to the concrete by shaping the edges with a wire brush and cold chisel. This will create a clinging surface for the filler, making your repairs last for years.

Step 2 – Clean up Dirt and Debris

You can remove dust and debris by roughening out crack edges. Don’t worry. You can use a masonry brush, a thick-bristle paint brush, or a shop vacuum to clean the area. You’re ready to repair cracks like a true concrete artist with a clean work surface.

Step 3 – Measure the Crack Depth

You can fill in the crack by following step four if it is less than 1/2 inch deep. If the crack is over 1/2 inch deep, you can fill it with sand or a backing rod. Fill the crack up, leaving 1/4 inch to the surface.

Step 4 – Fill the Crack with Concrete Crack Sealer

After you have cleaned and roughened the crack edges, measured the crack’s depth, and cleaned it, you can add a concrete sealer. You can find this product at your local home center. Follow the instructions provided by the manufacturer as you repair the crack. Because the sealer shrinks as it dries, you must fill the crack slightly more.

fixing cracks in concrete driveaway

How do you repair narrow concrete cracks?

Narrow concrete cracks can be filled with masonry crack filler, which can be applied using a caulking gun. Many products are also available in bottles that have an applicator tip. You can repair very small cracks like hairline ones using a vinyl concrete patching compound. This is applied to the crack and smoothed out with a trowel or putty knife. Repair caulk or crack filler applied over hairline cracks is usually ineffective as it tends to crumble over time.

Sometimes, narrow cracks can extend through the entire thickness of the concrete slab. It’s a good idea for the repair to begin by inserting a foam backer rod in the crack to provide a foundation to support the material. There are many sizes of backer rods available. 

Make sure to choose a diameter slightly larger than your crack’s width. Use a screwdriver or a screwdriver and insert the backer rod in the crack to 1/4 inch. Follow the manufacturer’s instructions to fill the crack with the repairing material.

Repairing Hairline Cracks in Concrete

Plastic shrinkage is responsible for the appearance of hairline cracks in concrete. These cracks can appear as small as 0.003 inches (0.08mm in width) and are often seen in freshly placed concrete.

These are the steps to repair concrete hairline cracks:

  • Cleaning Crack

This is the first step in repairing concrete cracks. After inspection of the crack, any oil or stains that have penetrated the crack and discolored the concrete will need to be removed before the crack can be repaired.

  • Sealant Selection

Sealant is a filler that is applied to cracks. Low surface tension and low viscosity are the best qualities for sealants. These characteristics enable the liquid sealer to penetrate deep into cracks.

Concrete crack repair materials include silicone caulking, latex caulking, and polymer-modified cement grouts. The most common material used to repair concrete cracks is polymer-modified cement grout. This material is used to repair cracks in concrete that have not been sealed.

  • Sealant application

You can apply the selected sealer to the substrate using a squeegee or a roll. To ensure penetration, the application must take between 5-10 minutes.

  • Curing

To complete hardening sealant, proper curing must be done. Higher temperatures will speed up curing. Lower temperatures will slow down curing.

How To Repair Concrete Steps and Walkways?

Repair Concrete Steps and Walkways cracks in right

Check out the steps below:

Step 1: Take out the loose concrete

Any concrete that is crumbling or damaged should be removed. You can use a small sledgehammer with a chisel to cut the damaged areas.

Step 2: Clean the Concrete

Use a wire brush or a broom to clean the affected area. Next, wash the area with clean concrete and water.

Step 3: Place the Concrete Patch Form

As a form, use a board to secure it against the area you want to repair. To hold the board in place, you can use bricks or other heavy items to support it. The form’s top should meet the desired height at the edge. You can use the form as a guideline for smoothing out the patch.

Step 4: Mix concrete crack sealer

Mix the vinyl patching compound according to the manufacturer’s instructions and apply the compound to the area. To eliminate air pockets, you can tamp the mixture. Mix it with a bonding agent instead of water to make patching mortar.

Step 5: Smoothen the Concrete Patch

Use the top of your form to guide you as you smoothen the mixture.

Step 6: Complete the patch

Once the patch has dried, remove the form. Smoothen or brush the patch’s surface to match the concrete surrounding it.

You should not touch the patched area until it has cured according to the manufacturer’s instructions. if you want to make it beautiful again then you can paint it with acrylics for better looks and aesthetics of the area after fixing the cracks.

Structural Concrete Wall Repairs

Low-pressure crack injection can be used to repair concrete walls that are structurally sound. This is done to bond concrete again and prevent water seepage.

  1. Every 4 to 6 inches, plastic injection ports are inserted in the crack.
  2. The epoxy paste is used to seal the ports to concrete.
  3. The epoxy adhesive is applied over the crack and left exposed port tops.
  4. Slowly infuse the epoxy or urethane bonding agents into the crack, starting at the bottom and moving up to the top. The epoxy adhesive is capped to protect the ports and force the bonding agent into cracks.
  5. The epoxy is removed after 24 to 48 hours, and the ports are cut off or removed from the wall.

This is an effective and efficient method, but it is not something you can do yourself. Foundation repair professionals should only do this.


We hope that the above mentioned steps help you fix your cracks in concrete!

Frequently Asked Questions

Can cracked concrete be fixed?    

You can repair smaller cracks with concrete caulk and liquid filler.

How long does concrete crack repair last?    

Crack sealing can last up to 8-10 years if done correctly. This makes it a reliable treatment.

How to Fix Cracks in Concrete Patios?

  1. Broaden the crack.
  2. Get rid of the cracks.
  3. Add the Solid Crack Filler.
  4. Use the Concrete Crack Filler.
  5. Flatten the Filler.
  6. Let the Patch Cure.

Is it possible to repair cracks in concrete driveways?

You may be able to stop cracks from forming in concrete driveways by learning how to fix them. Filling cracks in concrete driveways is an easy and inexpensive DIY job. Rubber gloves are recommended for handling concrete mixers, fillers, and resurfacers.

Is it possible to repair a crack in concrete walls?

Injecting epoxy filler is the traditional method of repairing a concrete wall crack. It doesn’t create a strong bond. It is great for filling vertical cracks which are unlikely to get larger, but not for horizontal cracks which can grow over time. if you want to hide your crack repairs on wall for aesthetics reasons then you can make use of paint of your choice to make design on the concrete for better looks. if incase you intend to remove spray paint from concrete before fixing then read about it in this post on spray paint removal.

Which concrete crack filler is best?

Large concrete cracks should be patched with a concrete repair compound. Concrete caulk and liquid fillers can be used to repair smaller cracks less than 1/4 inch in width. Mixing water with patching compounds is done with a trowel.

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