How to Repair Concrete
Repairing concrete requires careful selection of materials and proper application procedure. The success of a repair usually depends on the quality of the bond between the old and new Concrete Cincinnati.
Tripping hazards such as cracks, chips, raised edges, and recessed areas create uneven surfaces that reduce foot traffic safety and efficiency. They also diminish your facility’s appearance.
Cracks
Cracks in concrete are a common repair issue that can range from minor hairline markings to large crevices along walls and floors. They can create a dangerous walking surface, reduce your facility’s energy efficiency and give insects and moisture a pathway into your structure. They are also a visual detractor and can affect your business’s image.
The cracks can be caused by a number of factors, including drying shrinkage, temperature movements, poor concrete placement and reinforcement design issues. Depending on the size of the crack, and the underlying reasons for it, there are several methods of concrete repair that can be used.
Conventional concrete repair uses new concrete to fill and bond with the existing damaged concrete. It should have a low water/cement ratio and a high percentage of coarse aggregate to minimize shrinkage cracking. It should also be mixed with a chemical bonding agent to enhance adhesion. When repairing concrete with conventional replacement, it is critical to clean the cracks to remove dirt and debris. The area should then be flushed to remove any remaining unsound concrete and to ensure that the replacement is fully bonded to the existing concrete.
Narrow cracks can be repaired with polyurethane crack injection. The resin is injected into the crack and reacts with the water to create a seal, preventing future water leaks. It works with both active and dormant cracks and is a permanent solution to water leaks in concrete.
For wider cracks, experts recommend chiseling the base of the crack to broaden it and to dislodge any loose material. It is then important to clean the crack with a wire brush or pressure washer tool to remove any remaining debris and contaminants. It is also a good idea to use a hammer and stonework chisel to notch the sides of the cracks to form an inverted V shape. This allows the repair product to better “key” into the existing concrete and creates a mechanical bond in addition to a chemical one.
It is a good idea to put a thin coat of masonry bonding adhesive onto the backside of the concrete before filling it with the crack repair product. This step is often neglected but improves the integrity of the repair and prevents debonding. For more severe cracks, a thicker coat may be required.
Chips
A concrete surface that has become chipped, peeled or broken is not only an eyesore, it creates a trip hazard and can allow pests and weeds to grow in the opening. In addition, if left unattended, this type of damage can also lead to further deterioration and structural problems. In some cases, this may involve the need for expensive demolition or replacement of the damaged area.
To repair these areas, you need to use a product that can bond to the existing concrete. There are several products available that can be used for this, including epoxy compounds and latex patching materials. The most effective product will be one that is a cement mix with an acrylic fortifier added. It’s important that you follow the mixing directions exactly. This will ensure that the compound is properly hydrated so it can bond to the concrete and fill in the chips.
Once you have the chipped or spalling concrete repaired, it is a good idea to apply a concrete sealer over the patch to protect it from the elements. The sealer can help to prevent further cracking as well.
The best type of material to use for large areas of pitting and spalling is a polymer-modified cement patch such as Ardex CP or Ardex CD. This will provide a stronger, longer-lasting repair than traditional concrete patches. It’s also a better choice for areas that need to be shaped, such as the edge of a concrete apron.
Before applying the concrete patch, rinse the area thoroughly to remove any dirt or debris that is loose. If the area is exposed to corrosion, you should prime it with a suitable metal primer such as rust-inhibiting concrete primer. If the patch is to be in a wet environment, you can also apply a water-repellent additive to the surface.
Once the patch is applied, you should smooth it with a steel trowel. Then, use a damp sponge to blend the edges of the new patch into the surrounding concrete. If necessary, the sponge can also be texturized to match the surface of the existing concrete.
Hole
When a hole forms in concrete, a few basic steps can solve the problem. First, the area around the hole should be clean and free of debris. Next, a new concrete mix should be prepared. A small amount of quick-setting cement is a good choice for this type of repair, since it sets within five minutes. This type of cement also has a better bond with existing concrete, and it helps the patch knit together with the surrounding slab.
Before repairing, power wash the concrete to remove any dirt or debris that may weaken the bond between the concrete and the patch. Then, use a cold chisel to remove any loose concrete chunks in the hole. Make sure to wear safety goggles when removing concrete. This will help prevent any flying pieces that could hit you or your surroundings. Once the hole is clean, it should be filled with a concrete mix designed for this type of repair.
A good quality mortar mix should be used, and it should be mixed with water to a peanut butter consistency. This mix is then applied to the hole, smoothing with a concrete trowel. Once the patch is smooth, a finisher should be used to create a texture that matches the surrounding concrete.
Once the surface of the repair is finished, it should be allowed to set for 48 hours before being walked on or driven on. During this time, it is important to swipe the trowel over the surface every five minutes for 30 minutes, as this helps the concrete blend in with the existing concrete.
For a more decorative touch, the concrete can be colored with a color stain or paint. This is an optional step, but it will give the concrete a custom look and add to the appeal of your home. If you do choose to use a stain or paint, the finish should be cured for two weeks before walking on the concrete. If a sealer is used, the finish should cure for three months. These curing times are crucial to a successful repair job.
Sunken Area
When a sunken area appears around your home it is a safety issue and should be repaired as soon as possible. It can create trip hazards, especially for children and elderly people in the house. It is also an unsightly look that can affect your property value as well. Additionally, third parties can be hurt by the uneven surfaces causing them to fall. This could result in a liability lawsuit against the property owner.
Sunken concrete can happen for several reasons, the most common is soil erosion. This can be caused by water from downspouts hitting along the surface or even worse, flooding the foundation or soil below a slab. Another cause is improper base compaction during construction. It is important that when a new slab of concrete is constructed the base gets compacted properly so it does not sink over time.
There are a few options to address sunken concrete. One option is to remove the existing concrete and completely replace it. This is the most expensive but will give you long-lasting results. It is however a messy, noisy and time-consuming process. You may not be able to use the entrance or areas while it is being done and there will be a significant wait time for the concrete to cure.
Mud jacking and polyurethane foam injection are less invasive and cost effective ways of dealing with sunken concrete. They both work by pumping a liquid mixture of soil and Portland cement underneath the existing slab to lift it back to its original position. This method is quicker than full replacement and you can begin using the surfaces almost immediately after it is completed.
It is important that you do not ignore sunken concrete because it will not get better on its own. In fact, the problem will only grow and can result in further damage to your home or building and a more costly repair bill in the future. Contact a concrete repair specialist today to discuss the best option for you. They can use their years of experience and exclusive tools to effectively raise the sinking concrete and help you avoid further issues with your concrete.
