NUMERICAL CALCULATION OF THE HYDRATION TEMPERATURE FIELD IN A MASS CONCRETE
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摘要: 以考虑温度影响的混凝土水化放热为基础,通过试验获得混凝土的绝热温升数据,在此基础上建立三维有限元模型,对大体积混凝土足尺模型浇筑后60d内的温度场进行了计算,并与实测数据进行比较。结果表明,混凝土内部最大温升约为40℃,5~7d达到峰值;任意两点间的温度差不超过25℃;在竖直方向上,上下表面温度梯度最大,且出现在混凝土自身放热完毕并开始向环境中散热的初期。Abstract: A three2dimensional finite element model is established,based on adiabatic temperature2rise experiment and the hydration heat of concrete effected by temperature, with which the temperature field of a mass concrete mock2up in 60 d is calculated and compared with data measured on site. The results show that the temperature rise inside the concrete is about 40 ℃, which is achieved between 5 and 7 d. The difference of temperatures between any two points is less than 25 ℃. The maximum of temperature gradients in the vertical direction is on both the top and bottom surfaces, which is attained at the beginning of cooling stage after the temperature rise.
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Key words:
- mass concrete /
- temperature field /
- hydration heat /
- adiabatic temperature rise
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[2] 王铁梦. 工程结构裂缝控制. 北京:中国建筑工业出版社,1997 朱伯芳. 大体积混凝土温度应力与温度控制研究. 北京:中国电力出版社,1999 [3] Springenschmid R. Prevention of Thermal Cracking in Concrete at Early Ages. London,EFN Spon, 1998 [4] 王甲春, 阎培渝, 韩建国. 粉煤灰混凝土绝热温升的实验测试与分析. 建筑材料学报2005, 8 (4) : 446-451
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