laitance

[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. 2014.
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Example sentences
Remove all laitance, loose material, and rebound by brooming or scraping.
Verify concrete is clean and free of laitance, grease, oil and contaminants.
Proper preparation should produce a slightly textured surface profile while
  removing all contamination and laitance.
At development of initial set, lightly broom surface to remove any laitance to
  provide better bond with succeeding applications.
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