laitance

From French laitance.

laitance (plural laitances)

1. (construction) 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.
2. (construction) 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.

• https://www.merriam-webster.com/dictionary/laitance Accessed Oct. 2019
• https://www.dictionary.com/browse/laitance Random House Unabridged, accessed Oct. 2019

• Alicante, analcite, Anticlea

lait (“milk”) +‎ -ance

• IPA^(key): /lɛ.tɑ̃s/ ~ /le.tɑ̃s/

• Audio:

  (file)

laitance f (plural laitances)

1. roe
2. laitance

• → English: laitance

• “laitance”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.