What is efflorescence?
Efflorescence or salt spots are white spots that appear on the surface of paving stones during the the curing process. This is a side effect of the curing process and does not affect the quality of paving stones themselves.
Scientifically speaking, efflorescence is caused by a chemical reaction between calcium hydroxide, which is a component of concrete, and the carbon dioxide present in the air. This reaction creates insoluble calcium carbonate.
This process is affected by moisture, air temperature and wind, and can most frequently be observed in autumn and winter, because evaporation is slower and the volume of salt spots is higher.
How do you get rid of salt spots?
Usually, salt spots can be simply cleaned off or rubbed with a brush and rinsed with water. However, sometimes special surface cleaning detergents are required, such as REBAnit S (also available from “NordBrik”)
NordBrik solution against salt spots
In order to more efficiently combat this phenomenon, special processing technology has been introduced in the NordBrik paving stone manufacturing process. An impregnating coating of lacquer can be applied to the paving stone surface at the customer’s request. This coating closes the surface pores and prevents the appearance of salt spots. This technology facilitates care of paving and repels dirt, making it easier to preserve colour over time.