大体积混凝土降温速率动态限值的确定方法

The Determination Method for Dynamic Limits of Cooling Rate for Mass Concrete

混凝土作为当代使用价值较高的建筑材料,被广泛应用于各种建筑中。但是,大体积混凝土存在水化热和收缩等影响质量的问题,此过程产生的应力会让大体积混凝土构件在早期出现开裂,影响混凝土的抗裂性能和抗渗性能。本文研究混凝土的开裂机理和开裂规律,通过对混凝土底板进行绝热试验,采集数据并绘制混凝土的绝热温度提升曲线,找到水化热的反应持续时间,并对不同的反应时间采取相应的温控措施,通过理论学习和实际数据的对比,找出大体积混凝土的降温速率动态限值。

As a building material with high use value,concrete is widely used in various buildings.However,during the physiological period of mass concrete,there are some problems that affect the quality,such as hydration heat and shrinkage.The stress generated by this process will cause the cracking of mass concrete members in the early engineering period,which will affect the anti-cracking performance and impermeability of concrete.In this paper,the cracking mechanism and cracking law of concrete are studied.Through the adiabatic test of the concrete used in the base plate,the data are collected and the adiabatic temperature rise curve of the concrete is drawn,the reaction duration of hydration heat is found,and the corresponding temperature control measures are given for different reaction times.Through theoretical study and comparison of actual data,the dynamic limits of the cooling rate for mass concrete is found.