laitance

Noun. (construction) A weak layer of cement and aggregate fines on a concrete surface that is usually caused by an overwet mixture, overworking the mixture, improper or excessive finishing or combination thereof. Also, could be caused when a slurry mix is used on a deep foundation, where the slurry mix is not completeley removed before placing concrete on top.

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This entry was last updated on RefTopia from its source on 3/20/2012.