lai·tance

[leyt-ns]
noun
a milky deposit on the surface of new cement or concrete, usually caused by too much water.

Origin:
1905–10; special use of French laitance milt, equivalent to lait milk (< Latin lact-, stem of lac) + -ance -ance

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Laitance is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a chattering or flighty, light-headed person.
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Example sentences
Joints shall be thoroughly cleaned and laitance removed before a new pour is
  made.
Thoroughly clean, remove laitance and thoroughly wet and remove standing water
  in construction joints before placing new concrete.
At development of initial set, lightly broom surface to remove any laitance to
  provide better bond with succeeding applications.
Remove all laitance, loose material, and rebound by brooming or scraping.
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