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一、混凝土早期受冻的危害性及其冻害原因 国内外对混凝土早期受冻问题进行了大量的试验研究,得到的主要结论之一是:在正温搅拌的混凝土成型后立即受冻,强度不增加或增长甚微,当再转入正温后,其强度得以增长,但达不到混凝土设计标号;混凝土成型后经短期正温养护后受冻,强度停止增长或增长甚慢,当再转入正温养护后,
I. The dangers of early freezing of concrete and the cause of freezing injury A large number of experimental studies have been conducted at home and abroad on the problem of early freezing of concrete. One of the main conclusions obtained is that: Concrete mixed at positive temperature is immediately frozen after being molded, and the strength is not The increase or growth is minimal. When it is transferred to positive temperature, its strength will increase, but it will not reach the concrete design number; after the concrete is formed, it will be frozen after short-term positive temperature curing, and the strength will stop growing or grow slowly. When it is turned again, After entering positive temperature maintenance,