混凝土绝热温升新理论及在龙滩工程中的应用

New Theory on Adiabatic Temperature Rise and Its Engineering Application in Longtan Project

对不同养护温度条件下的混凝土绝热温升进行了研究,采用化学反应速率描述温度对混凝土绝热温升的影响,探讨了化学反应速率与养护温度之间的关系。根据混凝土不同养护温度(4.4℃、23.3℃和40.0℃)时绝热温升试验结果的分析,得出如下结论:①混凝土绝热温升可以用三参数双曲线函数描述;②化学反应速率是混凝土养护温度的非线性函数;③只有对混凝土样本化学反应速率的进一步研究,才能正确地计算混凝土结构的温度场和应力场。文章还提出了考虑混凝土化学反应速率的非线性热传导方程及其求解方法─在实际时间域和等效时间域求解。并将该理论用于龙滩碾压混凝土坝的温度应力与温度控制研究。

This paper presents an experimental study on the adiabatic temperature rise under different curing temperature conditions. The form of rate constant versus temperature function is adopted to describe the combined effect of ratio on adiabatic temperature rise. This study investigates the relationship between the rate constant and curing temperature. Based on adiabatic temperature rise data for concrete cured at 4.4 ℃, 23.3 ℃ and 40.0 ℃, the following conclusions are drawn:① Adiabatic temperature rise can be represented by a three parameter hyperbolic function;② The rate constant is a non-linear function of curing temperature; ③ Further study on the concrete specimens is necessary for correct calculation of temperature field and stress field of concrete structure. Consideration is also given to the non-linear heat conduction equation and its solution-solution in real-time field and equivalent time field-- for the ratio constant. This theory has been applied to the temperature stress and temperature control analysis for the RCC dam of Longtan project.