laitance

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laitance

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From French laitance.

noun laitances

A weak, milky 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 completely removed before placing concrete on top.
The weak top layer of cement and aggregate fines 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.

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MLA

"laitance." Wiktionary, via Micwyn, micwyn.com/word/laitance. Accessed 6 Nov. 2026.

APA

laitance. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/laitance

Chicago

"laitance." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/laitance.

BibTeX

@misc{laitance_2026,
  title = {laitance},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/laitance},
  urldate = {2026-11-06}
}