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laitance

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laitance [′lat·əns]
(materials)
Weak material, consisting principally of lime, that is formed on the surface of concrete, especially when excess water is mixed with the cement.
laitance
The accumulation of fine particles on the surface of fresh concrete resulting from an upward movement of water in the concrete; occurs when excessive water is used in the mixing of the concrete.
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The preferred method of preparing new concrete is to remove this laitance through mechanical means such as grinding, sandblasting, and mechanical scarification, followed by vacuuming to remove all dust and loose material.
Concrete coatings: selection and preparation provide a solid ... by Challener, Cynthia / JCT CoatingsTech
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.
Vibration insulating systems for high-speed railways using ... by Nakamura, S. / Rubber World
 
 
 
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