LAITANCE
In concrete, a weak, crumbly, and dusty surface layer caused by excessive water that has bled to the surface and subsequently weakened it. Over-working the surface during finishing can aggravate the problem. If laitance forms between pours, it must be brushed and washed away.
http://www.dictionaryofconstruction.com/definition/laitance
In concrete, a weak, crumbly, and dusty surface layer caused by excessive water that has bled to the surface and subsequently weakened it. Over-working the surface during finishing can aggravate the problem. If laitance forms between pours, it must be brushed and washed away.
ORIGIN:
1905-10; special use of French laitance milt, equivalent to lait milk
(< Latinlact-, stem of lac) + -ance -ance
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