大体积混凝土绝热温升表达式的推导与试验分析

由固体热传导理论可知,大体积混凝土绝热温升仅与其中的水泥水化放热规律有关。在化学反应过程中,温度对化学反应速率的影响服从Arrhenius方程。因此,根据水泥恒温水化放热规律和水泥水化放热行为的温度效应,可以预测任意温度条件下任一时刻水化放热总量,进而推导出大体积混凝土绝热温升表达式。试验验证采用10 mm木胶板内衬100 mm聚苯乙烯泡沫板和3 mm胶合板模拟绝热状态。最后得出大体积混凝土绝热温升表达式可以用双曲函数或复合指数函数表达,而因双曲函数形式上要比复合指数函数简单,建议使用双曲函数表达式。

Theoretical Derivation and Experimental Research on Adiabatic Temperature Rise of Concrete

Based on the thermal conduction theory,adiabatic temperature rise of concrete has relations with the law of hydration heat of cement.During the course of chemical reactions,specific rate of reaction influenced by temperature submits to Arrhenius equation.According to the law of hydration heat of cement curing at isothermal temperature and effect of temperature on heat release behavior of hydration of cement tested by author,total hydration heat of cement curing at optional temperature can accurated.And then expression on adiabatic temperature rise of concrete was inferred in terms of theory.After that,using the 10mm wood glue board lining 100mm polystyrene foam board and 3mm plywood analogs adiabatic status,made a trial test.Finally,made a summary：hyperbolic function and complex exponential function can used to express adiabatic temperature rise of concrete.In addition the hyperbolic function is simple in form than the complex exponential function,so author of this paper advise hyperbolic function expression.