刚构桥承台大体积混凝土水化热温度场模拟分析

Simulation analysis on hydration heat temperature field of mass concrete for rigid frame bridge cushion cap

为研究不同因素(冷却水管直径、环境温度等)下大体积混凝土的水化放热反应,以地泗河特大桥工程为背景,建立了承台大体积混凝土模型,并对不同影响参数进行了模拟分析。结果表明:通过在大体积混凝土中设置冷却水管以减小其内部温度梯度;控制冷却水管直径0.02 m、冷却水的进水温度20℃、冷却水流速1.2 m3/h、冷却水管间距1.2 m纵向布置、环境温度为20℃时,可以有效降低大体积混凝土的水化放热。

In order to study the hydration exothermic reaction of mass concrete under different factors(diameter of cooling water pipe,environmental temperature,etc),the mass concrete for cushion cap model was established and different influence parameters were simulated with the background of the Disi River Special Bridge Project.The results show that by setting cooling water pipes in mass concrete,the internal temperature gradient is reduced.When the diameter of the cooling water pipe is 0.02 m,the inlet temperature of the cooling water is 20℃,the flow rate of the cooling water is 1.2 m3/h,longitudinal arrangement of cooling water pipes with a spacing of 1.2 m,and the environmental temperature is 20℃,the hydration heat release of mass concrete can be effectively reduced.