It occurs most readily in porous concrete near the surface. It is generally a white or off white colour with a powdery appearance.
They form faster efflorescence than calcium.
Construction materials efflorescence. There are two types of efflorescence. Efflorescence is a deposit of soluble salts and bases usually white in color that sometimes appear on the surfaces of masonry or concrete construction. Besides hydroxides or sulfates of potassium or sodium can create efflorescence which can come from cement water aggregate or even admixtures.
Bai in sustainability of construction materials 2009. New building bloom on a brick or stucco wall will usually not reappear if washed away by rain or brushed off by the homeowner. Time is often the best cure for efflorescence.
That s why any material having portland cement can cause efflorescence. If sufficient water is present in backings salts may dissolve causing the backing materials to effloresce. Effects of efflorescence is damp wall leading to various damages like unhygienic conditions decay dry rot of woodwork disintegration of masonry damage to furniture and internal decorations crumbling of plaster etc.
Efflorescence or salting can be found on fresh plaster too. Often efflorescence is apparent just after the structure is completed. During construction there are a few easy steps you can take to help minimize efflorescence bloom.
It s induced by low temperatures moist conditions condensation rain dew and water added to the surface of fresh concrete to assist troweling. Start by making sure that when materials are delivered to the jobsite that they are stored off the ground and protected from the elements. Efflorescence is a deposit of salts usually white formed on a surface the substance having emerged in solution from within either concrete or masonry and subsequently precipitated by evaporation.
As mentioned above the cause of efflorescence is water reacting with the salts in the plaster or other building materials and can occur after a water leak or where there has been a case of severe condensation. Efflorescence is a crystalline salty deposit that can occur on the surfaces of bricks masonry or concrete. Salting on fresh plaster can look white and fluffy.
Efflorescence is caused when soluble salts and other water dispersible materials come to the surface of concrete and mortars. While not a risk structurally it affects the appearance of a building particularly it features coloured concrete or brickwork. Although it may be an aesthetic concern efflorescence will not affect structural performance.
Efflorescence is not normally damaging but it is. Jake boyer business unit leader of prosoco s clean and protect group. Concrete and other backing materials may contain soluble salts contributing to efflorescence of brickwork.
On a slab such as a basement or garage floor or on patio blocks for example wear and foot traffic will eventually remove the discoloration.