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Цементийг тээвэрлэх болон хадгалах үед агаар, ус чийгний үйлчлэлд оруулж болохгүй. Ус (Барьцалдуулагч материалууд) Ус нь идэвхтэй түүхий эд бөгөөд цементтэй урвалд гол түүхий эд юм. Усны чанар нь ямар түвшинд эрдэсжсэнээс шалтгаалдаг. Ус нь янз бүрийн эрдэс давстай, органик болон механик хольцтой байдаг.
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