Experimental study on the critical freezing strength of C30 negative temperature concrete in the Alaer region of Xinjiang
The critical strength of C30 concrete under different mix ratios at from-5℃ to-20℃ was studied.At the same time,the rapid freezing method was used to conduct freeze-thaw cycle experiments on concrete that had reached the critical freezing strength at a temperature of-15℃.The experimental results show that the pre-curing time and critical freezing strength of concrete without antifreeze agent exhibit regular changes when subjected to freezing.The lower the freezing temperature,the longer the pre-curing time of concrete,and the greater the critical freezing strength.However,at the same freezing temperature,the critical freezing strength of negative tempera-ture concrete mixed with antifreeze decreases to varying degrees and is irregular.After reaching the critical freezing strength,the later com-pressive strength of negative temperature concrete with and without antifreeze is guaranteed,but the frost resistance is more serious than that of concrete under standard curing conditions.
negative temperature concretecritical freezing strengthpre-curing timefrost resistance
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