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乌鲁木齐地处西北,最热月平均气温+25.7℃,极端最高达+40.9℃,相对湿度最热月时为38％,居全国大中城市之冠,夏季风速平均2.1m/s(指地面2m高处)。阳光直射下混凝土表面温度高达+45℃以上,而夜晚有时突然降到+10℃以下,混凝土实际昼夜温差达30摄氏度以上,加上相对湿度低(仅38％)这一特定的气象条件,就对施工提出了特殊要求。如仍按常规施工对待,就会出现事故、缺陷,影响工程质量。一、裂缝情况某二层砖混建筑,一层顶板为现浇梁板。梁中距2.0～2.5m,板厚8cm,主筋φ6@200,分布筋φ6@300。200号混凝土,施工时为了加快进度改为300号,水泥用量因此增加了90kg/m~3,于夏季施工,采
Urumqi is located in the northwestern part of China. The average temperature of the hottest month is +25.7°C, the extreme maximum is +40.9°C, and the relative humidity is 38% at the hottest month. It ranks among the top cities in China, and the average summer wind speed is 2.1m/s (refers to the ground 2m). Height). The surface temperature of the concrete under direct sunlight is up to +45°C, but at night it suddenly drops below +10°C. The actual temperature difference between the daytime and nighttime of the concrete is more than 30°C, and the specific weather condition with low relative humidity (only 38%) is There are special requirements for construction. If it is still treated according to conventional construction, accidents and defects will occur and affect the quality of the project. First, the crack situation of a two-story brick building, a top plate for the cast-in-place beam. Beam middle distance 2.0~2.5m, plate thickness 8cm, main reinforcement φ6@200, distribution ribs φ6@300. No. 200 concrete, in order to speed up the construction to 300, the cement dosage increased by 90kg/m~3 during summer Construction, mining