laitance


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laitance

(ˈleɪtəns)
n
(Building) a white film that forms on the surface of drying concrete
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services prior to the site allowing in fine the cleaning of the networks (milling, Withdrawal laitance .
Surface preparation for all types of cementitious surfaces is covered under this standard, which should be free of surface contaminants including laitance, loose concrete and dust.
The concrete was cleaned and prepared to achieve a laitance and contaminant free, open textured surface.
Concrete may be covered with dirt, membrane-curing compounds (waxes, oils, or acrylic polymers), moisture, or laitance (a fine, loose, dusty layer).
For bonding the FRP sheets, the weak laitance were removed by wire brushing and the dusts were cleaned properly.
Shook: Permacast cement liners are structural by themselves and they adhere well to existing masonry and concrete substrates after pressure washing to remove laitance and contaminates.
For the uniaxial tensile testing, each cement concrete cylinder fabricated (100 mm tall and [empty set] 100 mm) was subjected to treatment with a primer after removing laitance on top of the cylinder specimen.
Laitance forms from the troweling of a cementitious resurfacer and working the fine particles to the surface.
It was also found that satisfactory adhesion strength could be obtained by removing laitance on the concrete surface and controlling the water content of the surface.
Preparation involves cleaning of mold release agents, laitance, efflorescence, and other contaminants.
This removed any dirt, oil, grease, loose mortar, concrete, aggregates, laitance or other contaminants.
Cleaning rates of up to 20 square metres of paint, rust or concrete laitance per hour are possible and in recent side-by-side trials, the Blastrac 1-7D cleaned an area three times as quickly as its competitors, in just one pass.