现浇砼受冻后,砼的强度就会降低。美国华盛顿大学的麦克尼西(Mc Neese)研究了未加气的现浇砼受冻的影响。根据他的研究结果,麦克尼西认为,冻结使砼强度受到的损失,取决于浇灌温度以及受冻前的养护时间。如果在受冻前只得到一个小时的凝结时间,强度损失可多至50％,如果浇灌温度为24℃,冻结前经过六小时的硬化,强度损失较小;如果浇灌温度为4℃,浇灌后立即冻结, When the cast-in-place concrete is frozen, the strength of the alfalfa will be reduced. McNeese of the University of Washington studied the effects of unfilled indwelling thawing. According to his research results, McNeese believes that the damage caused by the freeze on the strength depends on the watering temperature and the curing time before freezing. If the setting time is only one hour before freezing, the strength loss can be as much as 50%. If the pouring temperature is 24°C, after six hours of hardening before freezing, the loss of strength is less; if the pouring temperature is 4°C, after pouring, Freeze immediately