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早在50年代初,我国在推广了混凝土分标号、重量比、水灰比之后,已经能根据设计标号来设计配合比了。一个重要的提高,是认识到了水灰比是决定混凝土强度大小的主要影响因素。水泥研究者在干硬性混凝土的基础上进行了把水灰比由大变小的试验,摸索混凝土强度和水灰比的“极限”关系,发现当水灰比小到接近水泥水化需水量的时候,混凝土的强度能大幅度提高,完全可以使混凝土标号高出水
As early as in the early 1950s, after the concrete division number, weight ratio, and water-cement ratio were promoted in China, the mix ratio could be designed based on the design label. An important improvement is the recognition that the water-cement ratio is the main factor that determines the strength of concrete. Cement researchers conducted experiments on the basis of dry and hard concrete to reduce the water-cement ratio, and groped the “limit” relationship between concrete strength and water-cement ratio, and found that when the water-cement ratio is small enough to be close to the cement hydration water requirement, At that time, the strength of the concrete can be greatly increased, and the concrete marking can be completely out of water