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北方地区因为常温施工季节较短,所以一般在初冬时期对未完成的工程,在简单防护的情况下,仍开展正常施工。由于施工条件和气候的多变,使混凝土刚浇灌到模板内即出现冻害,有时不易及早
Due to the relatively short construction season at normal temperature in the northern areas, normal construction is still carried out for unfinished projects in the early winter period under the simple protection. Due to the change of construction conditions and climate, freezing of the concrete immediately after it is poured into the formwork is not always easy.