论文部分内容阅读
北方地区混凝土冬季施工受到寒冷气候的限制,如果不采取低温下的混凝土施工措施,不仅拖延工程的进度,造成浪费,而且还影响着工程的寿命.就这个问题根据个人的实践,谈一点粗浅的体会.1 基本情况宁城县位于东经118°16′～119°25′,北纬41°17′～41°53′之间.根据气象历史资料记载:极端最低气温为—29℃,初霜期一般出现在9月中旬.结冻期在11月上旬至3月下旬.≥10℃积温在3000～3200℃之间.根据混凝土的物理～化学特性,当周围温度降至
The winter construction of concrete in northern areas is limited by the cold weather. If concrete construction measures at low temperature are not adopted, not only will the progress of the project be delayed, resulting in waste, but it will also affect the life of the project. Based on personal practice, this issue is a bit shallow. Experience.1 The basic situation Ningcheng County is located between longitudes 118°16′～119°25′E and 41°17′-41°53′north latitudes. According to the meteorological and historical data, the extreme minimum temperature is -29°C. Appeared in mid-September. Freezing period from early November to late March. ≥10°C accumulated temperature between 3000 and 3200°C. According to the physical-chemical characteristics of concrete, when the ambient temperature drops