冷却管系统预防大体积混凝土早期裂缝的模拟研究

Cooling Pipe System Prevents Early Crack Formation in Mass Concrete

混凝土中的冷却管系统(CPS)在控制大坝、基础桥梁等大体积混凝土中的温度变化方面起着重要作用。尽管冷却管系统在大体积混凝土中的应用已有研究,但仅从冷却管系统的有利角度进行了研究,提出了大体积混凝土结构中由于水化热而形成裂缝的研究结果。为了降低大体积混凝土中的热负荷并提高裂缝防护的可靠性,借助先进的计算机程序,模拟和计算了在CPS存在下大体积混凝土中的温度变化,特别是温度场和热应力。此外,测定了CPS温度15℃的大体积混凝土中的温度场和开裂指数。结果表明,随着时间的推移,开裂指数可以大于1.50的允许值,这表明在大体积混凝土中应用CPS时不会出现开裂风险。

Cooling pipe systems(CPS)in concrete play an important role in controlling temperature changes in large volumes of concrete such as dams,foundation bridges,etc.Although the application of cooling pipe systems in mass concrete has been studied,but only from the favoravle point of view of cooling pipe system,the results of a study on the formation of cracks in mass concrete structures due to the heat of hydration are presented.In order to reduce the thermal load in mass concrete and improve the reliability of crack protection,the temperature changes in mass concrete in the presence of CPS,especially the temperature field and thermal stress,are simulated and calculated by an advanced computer programm.In addition,the temperature field and cracking index in mass concrete with a CPS temperature of 15℃were also determined.The results show that the cracking index can be greater than the allowable value of 1.5 over time,indicating that there is no risk of cracking when CPS is applied in mass concrete.