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Efflorescence, What is it and what can we do about it?

Efflorescence, What is it and what can we do about it?

Efflorescence can appear in both concrete products with a high cement content and some natural stone. This white powdery like substance extremely common on both un-laid and laid concrete products. It ranges from a mild bloom which gives the appearance of colour loss to large white blotches on the surface. It's appearance can be very spasmodic and unpredictable but is it not detrimental of the product. It can also show itself as streaks or a mottled or spotted effect. Although most commonly associated with concrete paving products efflorescence can also affect natural stone when it is laid on a full mortar bed. Limestone products can be particularly susceptible. This is a temporary phenomenon caused by the chemical reaction between water and cement which will weather out naturally and does not damage the paving. There are many efflorescence removers on the market, but we recommend it is left to weather out naturally to avoid any damage to the surface of the paving. Efflorescence is not a fault of manufactured natural stone.

 

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