水泥恒温水化放热统一模型

按照溶解热法测试基准水泥在恒温养护条件下的水化热,根据监测的水化热数据特征,分别按照双曲函数表达式、幂函数表达式、复合指数表达式和对数函数表达式拟合试验数据,根据相关系数以及函数表达式的外延值评价拟合函数的吻合度和适用范围。最后,提出基于活化能和等效时间的复合指数模型,该模型综合考虑了温升对水泥水化放热规律的影响,并推导出其离散模型,方便表达式在大体积混凝土水化热温升差分法解析时的应用。

General model for the heat of isothermal hydration of cement

The heat of hydration of reference cement curing at isothermal temperature is measured by dissolution heat standard in this paper.According to the characteristics of hydration heat monitoring data.Testing datas were fitting respectively in the way of hyperbolic function,power function,combined-expon-ential function and logarithmic function.Data coincidence and scope of application of its fitting function model were estimated based on coefficient and connotation value and extension value.In the end of this paper combined-exponential model based on activation energy and equivalent time was provided.Which given a synthetic consideration to effects of temperature rise on the hydration heat reaction rate.Furthermore,its discrete model was deduced.In favor of applied in finit-difference method resolving on temperature rise at massive concrete.