内埋热源混凝土冬季养护温度历程精确预控研究

Precise Control of Concrete Temperature History for Concrete Buried Heat Source in Winter

针对内埋热源混凝土冬季养护控温方法,研究热源对混凝土温度历程的作用.基于成熟度概念,研究养护温度、龄期对混凝土水化程度及热学性能发展的影响;依据抗压强度预测公式,预先设计温度历程;基于热力学第一定律,建立瞬时热能方程,构建温度历程精确控制方法,并通过试验验证.结果表明:该方法能够用于混凝土升温速度的准确控制,维持稳定阶段温度,以及保证混凝土降温速度,实现混凝土温度历程及强度的精准控制.

Aiming at the control temperature method of concrete buried heat source in winer,the influence of heat source on the temperature change of concrete was studied.Based on maturity concept,the effects of temperature and age on the degree of hydration and the development of thermal properties were considered.According to the prediction formula of compressive strength,the temperature history was designed in advance.Based on the first law of thermodynamics,the instantaneous heat equation was established.The precise temperature control method was established and verified by experiments.The results showed that this method can accurately control the temperature rise of concrete,maintain stable temperature,ensure the cooling rate of concrete,and achieve precise control of temperature history and strength of concrete.