![]() Exposure to rain or other water sources (moisture allows salts to be transported to the surface where they accumulate as the water evaporates). ![]() Inadequate curing which may leave un-hydrated products near the surface of the concrete.A high water-cement ratio resulting in a more porous concrete that allows movement of water and salt solutions.One or more of the constituents of concrete may contain salts.Efflorescence in concrete – what, why & how Why Efflorescence in Concrete Occur? (Causes)Įfflorescence is usually caused by a combination of the following factors: Note: With time, efflorescence becomes less extensive and should eventually cease to occur, unless there is an external source of salt. Light-coloured concrete shows the deposit much less than darker coloured concrete. Efflorescence is the formation of salt deposits, usually white, on or near the surface of concrete after it has been finished and causing a change in the appearance. ![]() Efflorescence in concrete simply means appearance of white colored powdered material on the concrete surface. ![]()
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