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What is Spalling Concrete?

Mary McMahon
Updated May 16, 2024
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Spalling concrete is concrete that has broken up, flaked, or become pitted. This is usually the result of a combination of poor installation and environmental factors that stress the concrete, causing it to become damaged. On a low level, it can be purely cosmetic in nature, but it can also result in structural damage, such as damage to reinforcing bars positioned inside the concrete. For this reason, it is important to address spalling when it first starts to appear.

The signs of spalling are easy to spot. The surface will become rough and flaky, and may pit. In some cases, chunks of concrete break loose from the installation. The concrete can also start to crack, especially if large chunks break off. It can be repaired by totally removing the damaged section of concrete and filling it in with cement.

The best time to address spalling is when concrete is first poured, by taking steps to prevent it from occurring in the first place. The concrete should be mixed with the right amount of water, and ideally the mix kept as dry as possible because a high water content can weaken the material. It also needs time to cure properly and should be handled carefully during curing. Sealing the concrete can also protect it from the elements. There are a number of sealants available for concrete and they can also work with a decorative finish.

If signs of deterioration are spotted in a concrete installation, it is best for the site's owner to act quickly to address them. The longer concrete is allowed to crack, pit, chip and flake, the higher the risk of serious damage. If spalling concrete is structural in nature, it may be advisable for the owner to consult a contractor or concrete professional to get advice and to perform any necessary repairs. This is especially important when damage to the concrete results in damage to bars used for reinforcement.

For decorative concrete, spalling can be a problem because it may mar the appearance of the concrete, even after the damage is repaired. It can be difficult to match things like tinted concrete and patterned concrete with a repair, since wear will have altered the appearance of the rest of the concrete. If concrete spalling appears in a decorative installation put in by someone else, it can be better to contact the contractor or company that put the concrete in and ask that they repair it.

HomeQuestionsAnswered is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Mary McMahon
By Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a HomeQuestionsAnswered researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

Discussion Comments
By SwiftBeats — On Apr 07, 2011

I once had spalling occur the day after my concrete was poured because the contractor forgot to add sealant. It snowed the next day and the entire patio was ruined. Luckily, the contractor replaced it without charging me anything, but he took a huge loss!

By stoshu — On May 13, 2010

Considering that all things are equal. How long does it take for spalling to occur on a wall structure?

Mary McMahon
Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a...

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