Ever wondered what efflorescence is and how it occurs? The
occurrence of efflorescence is a potential problem whenever Portland cement
products are used. There have been many industry articles and resources available
that speak on the issue of efflorescence - It is important to note that
efflorescence is not considered a defect of the installation materials, but
rather a naturally occurring issue common to all Portland cement based
products.
The best way to prevent efflorescence is to better understand what it
is and how it happens. Three things have to happen for efflorescence to become
a problem:
- There must be
soluble salts present (these salts are present in Portland cement products
from the manufacturing process).
- Water must be
present in the setting bed, mortar bed and/or grout.
- Some type of force
(evaporation, gravity, capillary movement, etc.) has to bring the salts to
the surface of the installation.
Salts can then be put into solution and brought to the surface. If all 3 things occur then the water evaporates, the salts remain on the surface where they react with carbon dioxide in the air. The reaction turns the salts into a visible white material that collects on the surface. These salts can be calcium carbonate, sodium carbonate, potassium carbonate, or calcium hydroxide depending on the source of the Portland cement raw materials and any additives that may have been added to the concrete or mortar.
Eliminating any of the 3 needed circumstances will eliminate the
occurrence of efflorescence. For more information on the best ways to help
minimise the occurrence of efflorescence, read the full Technical Data Sheet TDS-1159.
Contact us to discuss your next project, arrange a demo or your FREE
samples by calling 1800 331 012 or contact us here.
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