laitance layer

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laitance — noun A weak 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 … Wiktionary
lai|tance — «LAY tuhns», noun. a layer of milky water droplets formed on the upper surface of freshly laid concrete, usually as a result of using too much water in the mixture. ╂[< French laitance < lait milk (< Latin lac, lactis) + ance ance] … Useful english dictionary

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