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1 引言在大体积混凝土夏季施工中,主要预冷措施为冰冷、风冷和水冷。“三冷”中首先考虑的是冰冷和水冷,降温幅度为5～8℃。当混凝土出机口搅拌温度要求在18°～20℃以下时,在加冰措施的同时,还应考虑风冷。当混凝土出机口温度要求在10～12℃以下时,应“三冷”并举。“三冷”并举时,对冷负荷的分配,水冷、风冷、冰冷通常各占40%、30%、30%。
1 Introduction In summer construction of mass concrete, the main pre-cooling measures are ice cooling, air cooling and water cooling. The first consideration in the “three colds” is ice-cold and water-cooling, and the cooling rate is 5-8°C. When the mixing temperature at the concrete exit is required to be below 18° to 20°C, air cooling should be taken into account when adding ice. When the concrete outlet temperature requirements below 10 ~ 12 °C, should be “three cold” concurrently. When “three colds” are combined, the distribution of cooling load is usually 40%, 30%, and 30% for water cooling, air cooling, and ice cooling.