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How to Eliminate Concrete Efflorescence


Concrete efflorescence is one of the toughest problems a concrete repair contractor can face since it’s difficult to solve. It occurs in all kinds of concrete and is one of the most common issues that occurs with colored concrete. So, what can you do about it?


What Causes Concrete Efflorescence? Concrete efflorescence occurs when soluble salts and other water dispersible materials come into contact with concrete and mortars. Some of its catalysts include low temperatures, damp conditions, moisture, condensation, dew and water on the surface of fresh concrete. It can form quickly after being exposed to moist surfaces or gradually under cool conditions, especially if it comes from within the concrete or the subgrade. This is especially true if your concrete is made from Portland cement.


According to concrete maintenance experts, these are also possible causes of efflorescence:


  • Improper masonry rising after repointing

  • Improper flashing, expansion joints and caulking

  • Faulty drainage

  • Too much water added to concrete


How to Eliminate Concrete Efflorescence?


The best time to remove calcium hydroxide efflorescence is before it starts to mix with carbon dioxide. During this period, it will dissolve in water, so it’s a good idea to get your pressure washer and scrub it off with a solution so that it can be easily rinsed away. Be sure to use fresh water when you’re cleaning the surface so that there’s no residue left on the concrete. Once done, use a wet vacuum to remove any standing water. To prevent this issue entirely, you’ll need to install vapor barriers to prevent moisture from moving from the subrade to the surface since water is the root of efflorescence.


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