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洪水調節のため,一定水位以上になると越流するように造られた堤防。遊水地等に用いられ,越流によって破壊されないようコンクリート被覆するなど堅固な構造とします。

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（retarder）セメントの水和反応を遅らせ、凝結に要する時間を長くする混和材。

シャタリング用の太いセパレーターのこと。