Can You Repair Cracked Concrete?
Wide cracks in concrete are best patched and sealed with a concrete patching compound. Smaller cracks, less than 1/4 inch wide, can be repaired with a concrete caulk or liquid filler, or Epoxy Injections to Repair Cracked Concrete.
Patching compounds typically are mixed with water and applied with a trowel. They have a texture similar to grout and can be smoothed and textured to blend with the surrounding area. However, the colour of the patch will look like new concrete and will not match the old concrete. Hiding the patch completely requires painting the surface with appropriate concrete paint.
Wide cracks in concrete are best patched and sealed with a concrete patching compound. Smaller cracks, less than 1/4 inch wide, can be repaired with a concrete caulk or liquid filler. Patching compounds typically are mixed with water and applied with a trowel.
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Surface cracks, or hairline cracks, are usually only a few millimeters wide and deep and either appears as a single thin crack or in a map-like pattern of cracks. A few surface cracks are common and will not lead to any major issues, unlike structural cracks.
It is easy to identify Structural cracks because they will be wider than Surface cracks, generally, around 5mm wider. They will stretch further into the concrete or completely through the concrete weakening or damaging the structure.
Epoxy Crack Injections
Epoxy Crack Injection Resin can mitigate problems of cracked concrete with larger and fine cracks. The ARDEX Epoxy Injections used to Repair Cracked Concrete uses a high strength, rapid setting two-part system to repair concrete damage from hairline cracks right through to structural repairs.
These products are ideal for repairing holes, spalls, and cracks in concrete, in internal as well as external situations where heavy-duty vehicle traffic is anticipated. Once cured, the Repaired Concrete Cracks will be two to three times stronger than the original concrete, guaranteeing a long-lasting and durable Concrete Crack Repair solution.
Epoxy injection is a process by which the structural integrity of a cracked concrete member can be restored to its original strength. Epoxy is pumped into a crack under pressure. The injection is performed to ensure that epoxy fully penetrates and fills the crack. Once the epoxy has cured, the concrete is in essence welded back together.
Epoxy has a cured strength many times higher than the concrete itself, restoring injected members to their original strength. Any known cause for the cracking or settlement of the structure should be addressed to mitigate any future movement.
Epoxy Injection is an extremely cost-effective alternative to the removal and replacement of cracked concrete and can be executed with minimal disturbance.
1) The epoxy injection method can be used to repair concrete cracks based on their width, length, and depth. The procedure used to inject epoxy into the cracks may vary depending on the location and direction of the cracks.
2) Epoxy injection is an economical method of repairing non-moving cracks in concrete walls, slabs, columns, and piers and is capable of restoring the concrete to its pre-cracked strength. Prior to doing any injection, it is necessary to determine the cause of the crack.
3) Epoxy Crack Injection Resin can mitigate problems of cracked concrete with larger and fine cracks. ACI specifies crack widths that are acceptable in structures under defined conditions. ACI 224R-012 provides a guideline for crack widths for reinforced concrete under service loads for new construction.
– Concrete support columns
– Foundation Walls
– Concrete Slabs
– Concrete Bridges
– Machine Base Plates
– Concrete Tanks
– Cost-effective alternative to removal and replacement
– Restores Structural Integrity
– Full Depth Repair
– Non Invasive
How Do I Stop My Concrete Cracking?
Concrete is defined as a mixture of sand, aggregate, and water. Aggregate is a composite of gravel, crushed stone, synthetic materials, slag, and other recycled substances. The quality of concrete has to do with the ratio of sand to aggregate and water. Too much or too little of either of these substances will result in poor-quality concrete. Concrete is mixed together with lime-based cement to form a malleable putty so that it can be worked into any shape. To enhance the durability of the concrete, additives can be thrown into the mixture before it is poured to make it more flexible and reduce its chances of cracking.
Curing is the period during which concrete obtains its strength and durability. 90% of concrete’s strength is acquired during the first four weeks after it is poured. The three factors which affect this process are hydration, temperature, and humidity. To ensure full hydration during curing, concrete slabs are usually sprayed with a hydrophobic wax film to keep moisture in. More traditional techniques involve spraying the concrete with water and wrapping it with plastic to get a similar effect.
The remaining 10% of the concrete’s strength is achieved over the years or even decades. The absorption of carbon dioxide strengthens the concrete and makes it more resistant to damage, however, it also becomes more acidic which can corrode steel reinforcement bars; otherwise known as rebar corrosion, Concrete Spalling & Concrete Cancer. The steel will expand while it is corroding which can cause the concrete to crack under pressure.
The most common form of concrete is ‘reinforced concrete’ which contains a steel framework or mesh. Concrete has a relatively high compressive strength but a significantly lower tensile strength. In other words, it is weaker when stretched out and stronger when compact. Steel, on the other hand, has a high tensile strength which compensates for concrete’s lack of tensile strength. Steel rebar, therefore, allows concrete to be stretched out in thinner layers. It is better for reinforced concrete to crack when stretched out rather than compressed because the steel reinforcement will hold it together, for example on a bridge.
How Does Concrete Crack Repair Work?
Concrete can crack for almost any reason. Concrete Crack Repair Sydney is committed to properly investigating the cause of your concrete cracks. Not only do we repair the damage but we also prevent future damage from occurring.
Firstly, it is important to understand that the quality of your concrete and the way it is cured will affect its resistance to cracking. The quality of your concrete has a direct impact on its durability and the curing process will affect its strength. Therefore we believe in using the highest quality materials and methods to repair your Concrete Cracks.
We use the latest technologies and practices to diagnose the causes of Concrete Cracking. These could be chemical, environmental, physical, bacterial, thermal, or even radiation. The selection of the appropriate approach will depend on the cause of the initial damage.
How To Repair Wide Concrete Cracks
1. The secret to fixing wide Concrete Cracks is to undercut the sides of the crack to give it an inverted “V” shape. This helps the repair material to “key” into the crack, creating a mechanical bond in addition to the chemical bond between the patch material and the concrete.
2. Chisel the Cracked Concrete with a hammer and masonry chisel to widen the base of the crack and to dislodge any loose material from the old concrete.
3. Remove all debris from the crack, using a wire brush. If desired, clean the crack with a pressure washer or a garden hose and spray nozzle.
4. Remove all water and debris from the crack with a wet/dry shop vacuum or a brush. Work carefully to remove all dust and grit from the Concrete Crack. It’s Okay if the surfaces are wet, but there should be no pools of water.
5. Mix the concrete patching compound, following the manufacturer’s directions.
6. Trowel the compound into the Cracked Concrete. Stab the trowel into the compound to remove air pockets and help work the patching material deep into the crack. Fill the Concrete Crack up to the surrounding concrete surface.
7. Smooth the surface of the patch with the trowel, feathering the compound into the surrounding concrete.
8. Brush the surface of the patching compound with a dry paintbrush to texture the surface, if desired.
9. Let the compound cure as directed.
10. Paint or seal the surface of the patch and surrounding area, if desired.
How To Repair Narrow Concrete Cracks
Narrow Concrete Cracks can be filled using masonry crack elastomeric filler that can be applied with a caulking gun. Very small cracks, such as hairline cracks, can be repaired using a vinyl concrete patching compound applied over the crack and then smoothed with a putty knife or trowel. For hairline cracks, applying repair caulk or crack filler over the cracks usually is not effective, as the caulk tends to peel off of the surface over time.
Narrow Concrete Cracks can be deep, often extending through the entire thickness of the concrete slab. Therefore, it’s a good idea to start the repair by stuffing foam backer rods into the Concrete Crack to create a base to hold the repair material. The backer rod is solid in a variety of sizes; use a rod diameter that is slightly larger than the width of the crack. Stuff the backer rod into the Cracked Concrete with a screwdriver to a depth of 1/4 inch. Fill the Cracked Concrete with the repair material, following the manufacturer’s directions.
Types Of Concrete Cracks
Carbonation over a long period of time concrete will absorb carbon dioxide from the air which causes a chemical reaction with lime in the cement, yielding more acidic concrete. This causes the steel reinforcement bars to rust and expand, the force of which will eventually crack the concrete. It can be tested using a pH indicator.
Chlorides shorten the setting time of concrete, however, they leach calcium hydroxide leading to a loss of strength which in turn affects the durability of the concrete leading to early failure.
Examples include ‘acid rain’ and ‘crown rot corrosion’ in sewers.
When water flows through the cracks in concrete, dissolving minerals and carrying them to other places forming lumps at the outer surface.
The leaching of calcium hydroxide from concrete cracks can facilitate the growth of ‘calthemites’ which mimic the appearance of stalactites in caves.
Seawater & wind, Concrete exposed to seawater is more susceptible to corrosion and erosion. Wind also plays a role in erosion.
Bacteria themselves do not have a noticeable effect on concrete, however, they do play a role in ‘crown rot corrosion’ in untreated sewer waters.
Earthquakes, tremors, and other sources of vibration are likely to impact the structural integrity of the concrete.
Fire will expose the concrete to gasses, acids, salts, and liquids that can be damaging.
Exposure to neutrons, gamma radiation, and high-flux material testing reactors in nuclear power plants and other radiation zones can cause concrete to become unstable.
Our Promise To You At Concrete Crack Repair Sydney
We specialise in delivering Concrete Crack Repair solutions to the residential, commercial, industrial, and civil sectors throughout Sydney. No job is too big or too small. We’ve built our reputation based on quality workmanship, efficient service, and value for money.
We offer the best prices in Sydney on all Cracked Concrete Repair jobs while maintaining a professional, fast, and efficient service for all our clients.
We will repair your Cracked Concrete to make sure that the foundation and structure of the building are safe, Our team has over 35 years of experience combined with the most skilled and also the most professional Concrete Crack Repair team that Sydney has to offer.
These are two of the many reasons that we are known for and often referred to as the best Cracked Concrete Repair assessment team in Sydney, our concrete teams are trained, certified, and insured to work on residential properties, large commercial projects, and construction sites.
Hire our specialist team with over 35 years of experience and all the trucks and heavy power tools needed to get the job done quickly, efficiently, and affordable.
We’re looking forward to extending to you the same quality results that we’ve become known for throughout the industry.
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