laitance

名詞

(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.

日本語の意味

コンクリート表面に現れる、弱く乳白色のセメントと微細な砂利粒子からなる層。通常は、過多な水分、混合物の過剰な操作、不適切または過剰な仕上げなどに起因し、または深い基礎に流動混合物が用いられた際に、完全に除去されなかった場合に発生する現象（建設現場で見られる現象）

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The inspector pointed out a thin layer of laitance on the new slab and warned that it could reduce bond strength and cause premature deterioration.

検査員は新しいスラブの表面に薄い弱い乳状のセメントと細骨材の層ができているのを指摘し、それが付着強度を低下させ早期劣化を引き起こす可能性があると警告した。

詳細

意味（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.

意味（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.

laitances （ plural ）