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所谓混凝土的临界强度,是指混凝土获得一定强度后受冻而不遭受冻害的最低强度。即达到这最低强度受冻后再标养28天的强度与标养28天强度相比强度损失不超过5％。我国现行规范(GBJ204—83)7·1·2条规定冬期浇筑的混凝土在受冻前混凝土的临界强度是指不掺防冻剂的混凝土。如按此标准来控制掺复合防冻剂的混凝土临界强度势必延长施工工期,提高工程成本,为此,研究和确定掺复合防冻剂混凝土临界强度成为当前迫切需要的任务。即本文就此提出掺防冻剂混凝土临界强度的探讨。
The critical strength of concrete refers to the lowest strength of a concrete that receives a certain strength and is frozen without suffering freezing injury. That is to say, the strength of the 28-day standard after reaching the minimum intensity and after freezing is not more than 5% as compared with that of the 28-day standard. China’s current code (GBJ204-83), 7.1.2, stipulates that the critical strength of concrete poured in winter prior to freezing refers to concrete without antifreeze. If this standard is used to control the critical strength of concrete mixed with antifreeze, it will inevitably lengthen the construction period and increase the project cost. Therefore, it is urgently needed to study and determine the critical strength of concrete mixed with antifreeze. That is to say, the paper discusses the critical strength of antifreeze concrete.