受冻临界强度是冬期施工中浇筑的混凝土在受冻以前必须达到的最低强度。
试验还表明，当混凝土强度达到受冻临界强度后，随着负温值的增大其强度缓慢增长，弹性模量也有缓慢增长。
The experiment also shows that after the concrete strength reach the frost-resisting critical strength, its strength and elasticity module will increase slowly with the decrease of the temperature.
再生混凝土是否存在临界受冻强度；
Whether the recycled concrete does exist critical frozen strength ;
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