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
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.
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.