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Why Is My Concrete Turning White?

Usually, this white or off-white discoloration to concrete and masonry forms when soluble salts and other water-dispersible materials come to the surface through capillary voids as a result of temperature changes, moist migration, condensation, rain, dew, and/or too much water in the mix.

Why Is My Concrete Turning White?

Concrete is a highly durable material that is often used in building construction, driveways, patios, and more. While it is generally quite solid and durable, it is not immune to problems such as discoloration. In some cases, concrete may turn white due to various factors.

The most common cause of concrete turning white is a reaction with water. This is known as efflorescence and occurs when water evaporates and carries the minerals in it up to the surface of the concrete. This evaporated water leaves an accumulation of calcium carbonate, visible as a white, powdery substance.

Another potential cause of concrete turning white is a reaction with alkaline compounds in the environment. Sometimes, the soil may be filled with high levels of an alkaline compound such as sodium hydroxide. This compound can react with the concrete and cause it to turn white.

In some cases, deicers and ice-melting chemicals can cause the concrete to turn white. While these chemicals are beneficial for removing ice from sidewalks, patios, and driveways, they can be damaging to concrete and cause efflorescence.

The most effective way to prevent concrete from turning white is to

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