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How to Fix Hairline Cracks in Concrete Driveway

How to Fix Hairline Cracks in Concrete Driveway

How to Fix Hairline Cracks in Concrete Driveway

A crack in a concrete road can be an unpleasant sight, but it’s not the end of the world. You don’t have to pay a fortune to hire a professional to fix these cracks; all you need are the correct materials and skills. In this post, we will walk you through the process of repairing hairline cracks on a concrete road step by step.

Hairline cracks in concrete can be difficult to repair. Over time, cracks form on all concrete structures. It is important that these cracks are not visible and do not affect the overall performance of the structure.

A well-made concrete structure should not form structural cracks so quickly. However, hairline cracks are to be expected. Stress. These cracks are not a sign of poor quality and can be repaired without much effort.

What causes hairline cracks in concrete?

Both significant structural and hairline cracks are often caused by stress relief. When the tensile stress generated exceeds the total resistance, it leads to the formation of cracks.

Most structural cracks on concrete surfaces are due to pressure and stress. However, hairline cracks can also be caused by shrinkage due to heat.

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Since they ideally occur close to the surface, concrete reinforcement does not help prevent them. The only preventative option you have is to use a good compound design that offers low shrink stress.

Hairline cracks, however, could need to be addressed, particularly if the building is surrounded by dampness. Concrete tends to absorb moisture from water exposure and then repeatedly dries in the sun.

Over time, these drying and wetting cycles cause your structure to crack in the same way that steel breaks after repeated bending back and forth.

Excessive heat exposure can also lead to hairy cracks in the concrete. Often, it is not the total heat intensity that damages the structure, but the total amount of time it is exposed to the concrete.

Although warming causes damage, subsequent cooling also plays a crucial role. As the structure cools, it shrinks, which in turn leads to the formation of hairline cracks.

Materials needed:

To repair hairline cracks on a concrete road, you will need the following materials:

• Sealing cracks in concrete: Choose a high-quality sealant designed for hairline cracks. It also has to be able to withstand weather changes and traffic.

• Gun Included: You will need a sealing gun to apply sealant to the crack.

• Protective equipment: Wear gloves and eye protection to protect your hands and eyes from sealing.

• Detergent: To clean a crack, you will need a vacuum cleaner, an electric washing machine or a hose with a high-pressure nozzle


How to repair hairline cracks in concrete

When repairing a hairline crack in a concrete structure, the gap is filled with a material that adheres well to the concrete, restoring its original appearance and preventing liquids from entering the structure and discoloring the concrete.

Step 1: Cleaning the cracked surface and interior

The hairline crack needs to be cleaned thoroughly to remove any dirt or stains on the spot. It is best to clean any external substances that have covered the surface before applying the putty to achieve good adhesion

Step 2: Moisten the crack.

It is necessary to moisten the cracks of the hair on the surface with water for at least seven hours before applying putty or grout to the crack.

By moistening this area, you prevent the concrete from absorbing water from the applied mortar. However, you need to make sure that there is no standing water and does not clog the surface of the crack. In this case, your grout will dry before it can properly seal the crack.

Step 3: Prepare the sealant

The most common mortar used to fill cracks in concrete is Portland cement, which is mixed with water. You need to add enough water to make a high-quality grout mix.

In addition to cement mortar, any other filler or sealant can also be used to fill cracks.

It should be noted that the ideal adhesive should have low surface tension and viscosity. These properties help the glue penetrate deep into the opening to fill it.

Step 4: Apply sealant to the crack

After proper moistening and cleaning of the cracks, the grout is applied. Our professionals at Big D Ready Mix Concrete recommend using a putty knife or sharpening putty to get the best results for the correct application of mortar.

It would help if you reinforced the joint in the crack as much as possible to make sure it fills the holes. Excess material that falls out can be smoothed and leveled to match the existing surface.

Step 5: Cure cracks in the concrete

Hardening the concrete is the last phase. Repaired sealed cracks need to be covered with plastic film or a shelf after being dry for at least two hours. The region needs to be covered for roughly five days. You must lift the top and give the surface a quick spritz of water each day.

Tips to avoid hairline cracks on a particular road:

• Proper installation: Choose a reputable contractor and make sure they follow proper installation practices, including preparing the substrate, using the right concrete mix, and ensuring adequate curing time.

• Test connectors: Integrate test joints into the road structure to allow the concrete to expand and contract due to changes in temperature and humidity.

• Good drainage: Ensure proper drainage to prevent water from accumulating on the roadway, which can weaken the concrete and cause breakage.

• Avoid heavy loads: Avoid driving heavy vehicles or equipment on the road, as this can put too much pressure on the concrete and cause it to crack.

• Applying sealant: Regularly apply sealant to the road to protect the surface from water ingress and other forms of damage.

• Regular maintenance: Check the road regularly for signs of damage and fix problems immediately to prevent further damage.


In short, hairline cracks on a concrete road can be unpleasant and ugly. By following these tips to avoid hairy cracks on concrete roads, you can reduce the chances of cracks in the first place. Be sure to choose a reliable contractor, include test seams in the construction, ensure proper drainage, avoid heavy loads, apply sealant, and maintain the road regularly. With these precautions, you can ensure that your concrete road remains stable and crack-free for years to come.

Frequently Asked Questions About Repairing Driveway Cracks

What is the best crack repair in concrete?

Applying a one-piece polyurethane sealant with a joint sealant gun is the best way to repair cracked concrete. This material has enough flexibility to ensure repairs take a long time and often fits right on the road after a few weeks

How do you seal cracks in concrete terraces?

You can seal cracks in your concrete patio with a one-piece polyurethane sealant, concrete plaster, polyurethane foam, or epoxy injection. You can do the repairs yourself or hire an experienced contractor to fix them for you.

How is outdated concrete removed and replaced?


To remove outdated concrete, use a jackhammer or specialty saw. After that, replace the surface by making forms, getting the new mix ready, pouring it, and allowing it to cure. For these tasks, a professional is frequently hired.

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