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在混凝土混合物中加入尿素和无机碱金属盐,可以防止冰冻对混凝土结构的破坏作用。在硅酸盐水泥中加入5％尿素和2％NaSO_4,做
The addition of urea and inorganic alkali metal salts to the concrete mixture can prevent the freezing from damaging the concrete structure. Add 5% urea and 2% NaSO_4 to Portland cement