When you experience cracks in concrete, it is really challenging to restore it back to its initial condition. One great way to repair it is to inject a liquid resin, while covering the surface with paste. There are two varieties of resin made with either of epoxy or polyurethane. Both materials have pros and cons. The process of concrete repair is relatively easy but a lot of people are confused: which is a better resin, epoxy or polyurethane?
Epoxy Based Resins
Epoxy is obtainable in different forms and for multiple applications. Most of the epoxy resins have a longer drying time. However, using an epoxy-based resin will ensure that the product cures hard and bonds securely to the surface.
The Advantages of Epoxy Crack Injection
- The tensile strength of cured epoxy is usually 7000 psi whereas the tensile strength of concrete is in the range of 300 – 700 psi; obviously, the bond strength of epoxy is much greater than that of the foundation wall. This makes the epoxy a good option for foundation wall structural crack repair.
- When a crack is under tension, it usually opens up. Hence, a material that cannot withstand the tension will tear. Epoxy is the best material to use when a crack is under tension; but construction chemicals manufacturers say that a reinforced polyurethane crack injection will work just as well.
- The low-pressure injection process used for an epoxy crack repair provides visual confirmation to the technician that the crack has been completely filled.
- The curing time allows the epoxy to slowly feed within the crack, thereby filling all parts of even the finest cracks.
Polyurethane Based Products
Polyurethane crack repair products are less expensive, and easier to use because of the mixture through a tube and its application. During cases of cracks and spalls, or when you need to rebuild control joints, it is recommended to use polyurethane.
The Advantages of Polyurethane Crack Injection
- Polyurethane can be used regardless of the condition of the crack and the weather. It does not matter if the crack is actively leaking, full of mud and/or mineral deposits, or if it is fine or wide.
- Polyurethane repair products can involve a crack flushing process to clean out the crack prior to injection.
- The chemical expansion of the polyurethane makes it very effective at filling voids within the concrete. These voids are commonly invisible when you look at the wall and are often associated with the porosity of the concrete.
- The rapid curing of polyurethane is beneficial when a leaking crack is flooding the basement. This is an important attribute when water-stopping is urgently needed.
The best way to know the best concrete repair method is to consult with experienced professionals about your specific type of crack problem. The team at Corrotech Construction Chemicals can provide consultation and expertise on a wide variety of methods, including the use epoxy and polyurethane based products, to repair your concrete. Get in touch with them at +971 4811 2100 or visit their website at https://www.mctuae.com/
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