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装配式钢筋混凝土构件的施工特点之一就是对混凝土的出厂强度提出很高的要求。根据实际需要,对于普通配筋的大多数构件,在夏季规定混凝土的出厂强度为设计强度的70%,冬季提高至100%。因此要研究分析各种施工条件下、在一定强度范围内蒸汽养护的混凝土强度增长的基本规律。CH_(5.0 1.23-8 3)指出,混凝土构件需以100%设计强度出厂,则须采用增加水泥用量的方法。欲使出厂强度由70%增加至100%,200号混凝上的水泥用量需平均增加60kg/m~3,400号混凝土需平均增加120kg/m~3。一些规范和标准规定,蒸汽养护(80℃
One of the characteristics of the construction of prefabricated reinforced concrete components is that it puts forward high requirements for the strength of the concrete. According to actual needs, in the summer for most components with common reinforcement, the factory strength of the concrete is specified to be 70% of the design strength, and winter is raised to 100%. Therefore, it is necessary to study and analyze the basic rules of the strength increase of steam curing concrete under a certain range of strength under various construction conditions. CH_(5.0 1.23–8 3) pointed out that concrete components must be delivered at 100% design strength, and the method of increasing the amount of cement must be used. To increase the factory strength from 70% to 100%, the amount of cement on the No. 200 concrete should be increased by an average of 60kg/m 3, and that of the No. 400 concrete should be increased by an average of 120kg/m 3 . Some codes and standards stipulate steam curing (80°C