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在现代建设中,常碰到具有施工季节性的现浇结构物(如道路和飞机场的路面及路基,灌渠护面层,工业建筑地面以及其他表面积大而又不必支模的大长度结构物)。这时,混凝土冬季施工的复杂性在于:与新浇混凝土相接触的基础是冻结的,结构的表面系数很大(12～20),而且将混凝土拌和物运到浇注地点的路途相当远,因而热损耗大。近年来,为建造这类结构,苏联和其他国家越来越广泛地采用自应力水泥混凝土。这种水泥不仅可以使变形受到约束的混凝土
In modern construction, there are often encountered cast-in-place structures with construction seasonality (such as pavements and roadbeds for roads and airfields, surface protection floors for irrigation canals, industrial building floors, and other large-length structures with large surface areas that do not need to be supported. ). At this time, the complexity of winter concrete construction is that the foundation that is in contact with newly poured concrete is frozen, the surface coefficient of the structure is large (12 to 20), and the road to transport the concrete mixture to the pouring site is quite far. Heat loss is large. In recent years, for the construction of such structures, the Soviet Union and other countries have increasingly adopted self-stressing cement concrete. This kind of concrete can not only make the concrete constrained from deformation