A weak, milky layer of cement and aggregatefines on a concrete surface that is usually caused by an overwetmixture, 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 completely removed before placing concrete on top.
The weak top layer of cement and aggregatefines on a concrete surface that stands between a topical coating and the underlying substrate. This laitance layer prevents a bond forming between the topical coating and substrate, whereby it causes delamination of the topical coating as the laitance layer fails first.
Origin
From French lait + -ance.
Modern English dictionary
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