still forms at the surface of this type of material, so it must be removed with any curing compounds prior to coating application.
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.
Dusting occurs when a small, thin weak layer called "laitance
Thus, the high percentage of grout weakens the effect on interlocking and framework structure, which even results in segregation, laitance
, and bleeding during the vibrating.
is a loose or powder layer of material on top of concrete.
This removes the paint, rust or concrete laitance
, which is then drawn away with any dust to a filter plant or industrial vacuum cleaner.
In the footing, deep pockets of laitance
and large voids extended beneath the pier along this face.
Direct tensile and shear tests performed on specimens of concrete cast upon HPFRCC IPC laminates show that failure never occurs in the interface between both materials, but either in the laitance
layer of the concrete or interlaminar between the glass fibremat layers in the HPFRCCIPC.